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The study was conducted to estimate the cost of groundwater irrigation and the impact of groundwater over-exploitation on the irrigation cost of paddy and maize in the Anantapur district of Andhra Pradesh. Based on the stage of groundwater extraction, the Central Groundwater Board divided the study area into safe and exploited areas. Primary data was collected from both these safe and exploited areas. The study found that the annual irrigation cost of groundwater in over-exploited areas for both paddy (?4033.38/acre) and maize (?3570.26/acre) were observed to be higher as against paddy (?2697.01/acre) and maize (? 2524.76/acre) in safe areas. The added cost of groundwater irrigation in over-exploited areas for paddy (?988.08/acre) and maize (?838.34/acre) were preponderantly greater than paddy (?216.60/acre) and maize (?187.82/acre) in safe areas. This revealed that groundwater over-exploitation had a more significant impact on over-exploited regions. Marginal and small farmers are the primary victims of groundwater over-exploitation in terms of cost and groundwater resources. Free/subsidized electricity for irrigation and water-intensive crops, paddy and maize, are one of the reasons for depleting groundwater in the study area. There is a solid requirement for controlling groundwater over-exploitation in the study area.
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ABSTRACT Fluorosis is a worldwide public health problem. One of the factors related to it is the type of water consumed, such as groundwater. High fluoride concentration in groundwater may be explained by contamination from local industries. Since fluoride and arsenic are the main pollutants of groundwater, some studies correlate groundwater consumption with high prevalence of fluorosis Aim The aim of this study was to conduct a systematic review to determine whether children's risk of fluorosis is related to drinking groundwater Materials and Method The protocol for this systematic review was registered at the National Institute of Health Research Database (CRD42021227298). A comprehensive search was conducted to identify potentially relevant studies by exploring a range of electronic databases (Medline via PubMed, Scopus, Cochrane Library, Science Direct, Web of Science Core Collection, Medline via Ovid, Lilacs, Embase, and grey literature) Results A total 2189 articles were found. After reading titles and abstracts, 63 were selected for screening, and the final data was extracted from 15 articles Conclusion A relationship was identified between drinking fluoridated water from wells and the prevalence of fluorosis in individuals up to 18 years old. This is the first study to assess the issue systematically worldwide.
RESUMEN La fluorosis es un problema de salud pública a nivel mundial y el tipo de agua consumida es uno de los factores relacionados con ella, como el consumo de aguas subterráneas. La alta concentración de fluoruro en estas aguas puede justificarse por la contaminación por industrias locales y las características del suelo, donde algunos estudios correlacionan el consumo de aguas subterráneas con una alta prevalencia de fluorosis, ya que el fluoruro, junto con el arsénico, se consideran los principales contaminantes de estas aguas Objetivo El objetivo es realizar una revisión sistemática que relacione el riesgo de fluorosis en niños expuestos al consumo de agua procedente de pozos Materiales y Método El protocolo de esta revisión sistemática fue registrado en el National Institute of Health Research Database (CRD42021227298). Se realizó una búsqueda bibliográfica de estudios primarios explorando diversas bases de datos electrónicas (Medline vía PubMed, Scopus, Cochrane Library, Science Direct, Web of Science Core Collection, Medline vía Ovid, Lilacs, Embase y literatura gris) Resultados Se encontraron 2189 artículos, tras la lectura de títulos y resúmenes se seleccionaron 63 referencias para examinar y, finalmente, se extrajeron los datos de 15 artículos Conclusiones Se identificó una relación entre el consumo de agua fluorada de pozo y la prevalencia de fluorosis en individuos de hasta 18 años, siendo este estudio el primero en evaluarlo sistemáticamente a nivel mundial.
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Background: This study focused on addressing health risks attributed to lead (Pb) contamination in groundwater, prompted by its known connection to negative health outcomes. It investigated the extent of Pb exposure through groundwater consumption near areas surrounding the former lead mine in Kabwe and non-mining areas in Lusaka, Zambia. The study compared the health risks of consuming Pb-contaminated groundwater in Kabwe's mining vicinity and Lusaka's non-mining areas. Methods: A comparative cross-sectional study collected 61 borehole samples from both areas and analyzed Pb levels using atomic absorption spectrometry. Health risks were evaluated via estimated daily intakes (EDI), target hazard quotient (THQ), and target cancer risk (TCR) assessments. Statistical analysis employed the Mann-Whitney U test due to non-normal data distribution. Results: Pb concentrations were significantly higher (p<0.05) in mining areas (median=0.131 mg/l) than in non-mining areas (median=0.071 mg/l). Alarmingly, 91% of mining and 74% of non-mining samples exceeded world health organization limits. Particularly, EDIs for adults and children from mining areas exceeded recommended intakes. However, THQs were <1, indicating no immediate adverse health effects. Equally important, TCRs fell within USEPA's acceptable range, suggesting negligible cancer risk associated with Pb exposure. Conclusions: The elevated EDIs in both mining and certain non-mining areas suggest potentially toxic health effects. Notably, the THQ values below 1 imply no immediate health risks. TCRs within acceptable limits underscore a minimal cancer risk. As a result, addressing elevated Pb levels in groundwater is critical in both study areas to mitigate potential health effects associated with Pb exposure.
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Agriculture is the backbone of the Indian economy. It gives employment to more than 50 percent of India's population. This sector contributes more than 15 percent to the country's GDP, which signifies its importance in our economy. Though important, it is highly susceptible to losses due to its high dependence on various variable factors such as rainfall, soil fertility, temperature etc., which varies across the region. This article analyzes various literature to help us understand the trend, effects, and impact of rainfall in the Chhatarpur district. We analyze the effects of rainfall on groundwater, cropping patterns, and irrigation facilities in that region.
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The time series of groundwater depth has the characteristics of trend, abrupt, and non-stationary. Based on the advantages of wavelet decomposition and long short-term memory neural network (LSTM), a new coupling model (wavelet decomposition-LSTM) for groundwater depth prediction is proposed. Firstly, wavelet decomposition is applied to decompose the groundwater data into high-frequency periodic signals and low-frequency trend signals, to reduce the complexity of the time series. Secondly, the decomposed high-frequency and low-frequency signals are taken as inputs to train the model respectively, and then the total prediction value is acquired. The improved model reduces the limitations of LSTM processing complex signals and improves prediction accuracy. Taking the No. 5 well of Lu Wangfen Town and the No. 3 well of Muye Town as the research object, the achieved results from the proposed model were compared with the results of the LSTM model and the back-propagation (BP) neural network model. This comparison shows that the performance of the new model is better than the others, and the average relative errors of the coupling model are 2.11% and 2.49% respectively. The proposed method has high prediction accuracy and generalization ability and is a more effective method for groundwater depth prediction.
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Water, a vital natural resource and essential component for all living organisms, exists in two primary forms: surface water and groundwater. Groundwater, a significant global resource, is unevenly distributed worldwide. Enhancing groundwater recharge is a fundamental hydrological parameter for assessing, managing, and modelling groundwater resources. However, determining recharge rates is a complex and challenging task, despite its crucial role in recharge assessments. The current study has been conducted in northwest part of Madhya Pradesh. The Neemuch and Mandsaur district comes under semi-arid zones and faces the problem of scarcity of water annually. The primary objective of this study is to evaluate groundwater potential zones using an integrated approach using geospatial tools. Various thematic parameters i.e., slope, rainfall, geology, drainage density lineaments, geomorphology and soil were considered for identifying evaluate potential zones. Thematic maps were generated using SRTM DEM, Sentinel-2 Imagery, and Survey of India (SOI) toposheets at a scale of 1:50000. The selected thematic factors were integrated for the determination of the groundwater potential of the study area, with appropriate weightage factors given to different themes by means of the multi-influencing factor (MIF) approach. This process was repeated for other layers, resulting in reclassified layers. These layers were then combined to delineate zones classified as “very good”, “good”, “moderate”, “poor”, and “very poor” for groundwater potential. The assessment of groundwater potential information using geospatial techniques can aid in identifying suitable locations for providing safe drinking water to rural populations. This comprehensive integrated approach of RS and GIS in assessing groundwater potentiality offers valuable insights for effective identification of suitable areas to meet the potable water needs of rural communities.
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The study of groundwater behaviour in the Tons Pump canal command area of Karchhana Tehsil was carried out by utilizing ground water table data from 1997 to 2021 (25 years). During the study period, the pre-monsoon water table depth ranged from 3.25 m to 19.55 m, whereas the post-monsoon depth ranged from 1.71 m to 17.70 m. The water table trend in the study area during the pre-monsoon season revealed that at 83.55% of the locations having falling trend, while the remaining 16.45% experienced neither rising nor falling trend in the water table. During post-monsoon season, the water table was falling at 89.99% locations, with the rest 10.10% having neither rising nor falling trend. Therefore, the study found that the majority of the study area was experiencing water table fall due to over-exploitation of ground water in the both pre and post-monsoon season. Development stages of the groundwater utilization study from 1997 to 2021 showed that during the year 1997, all block of the study area was found under safe category.The overall utilisation of groundwater development stage was determined to be 44.93%. In 2021, the overall development stage of groundwater utilization was found to be 64.11% and the entire study area comes under safe category of groundwater utilization. It was found that groundwater levels in the study area were progressively rising. Therefore, it was necessary to enhance the surface water supply through canal systems to reduce the draft of groundwater as well as artificial groundwater recharge is necessary to arrest the groundwater at the desired level in the study area.
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Agriculture relies heavily on irrigation especially with groundwater which is a significant source in many countries. However, excessive use of groundwater can lead to a decrease in groundwater levels and cause scarcity of water. Irrigation requires good-quality water which is governed by dissolved ions. The groundwater quality is greatly influenced by global population growth, climate change and human activities including mining, agriculture, industrial effluents, seawater intrusion, household usage, etc., A study was conducted to evaluate the quality of groundwater for agriculture in various blocks of Kanchipuram district in Tamil Nadu. The sampling was done during March 2023 and about one hundred and fifty groundwater samples were collected from different blocks of the Kanchipuram district viz., Sriperumbudur(32 Nos), Kundrathur (28 Nos), Walajabad (34 Nos), Uthiramerur (29 Nos) and Kanchipuram (27 Nos). The physio-chemical (pH and EC) and chemical characteristics of the groundwater samples, including the cations Ca2+, Mg2+, Na+, and K+, as well as the anions CO32-, HCO3-, Cl-, and SO42-, were analyzed and the resulting properties were computed (SAR and RSC). The pH and EC values ranged from 3.29 to 8.49 and 0.09 to 5.22 dS m-1, respectively. The Residual Sodium Carbonate (RSC) ranged from nil to 32 meq L-1, while the Sodium Adsorption Ratio (SAR) ranged from 0.19 to 34.78 mmol L-1. According to the CSSRI, Karnal Water Quality Classification about 38 percent of the samples falls in the good quality category, alkali water was about 57.33 percent and Saline water was 4.67 percent in Kanchipuram district. The Good quality water was dominant in Uthiramerur block followed by the Sriperumbudur block. The Saline and Alkali water was dominant in Sriperumbudur and Kanchipuram blocks respectively.
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The Present study was conducted to assess the groundwater inventory in Jamrani Dam Command situated in Uttrakhand and Uttar Pradesh, India. Groundwater inventory was prepared for different blocks of Udhamsingh Nagar, Rampur, and Bareilly districts in Jamrani Dam Command from 1988 to 2010 at an interval of five years. Over-exploitation of groundwater has created an alarming situation in a few blocks of Rampur and Bareilly districts in Jamrani Dam Command. In the year 2010, the Bilaspur, Baheri, Gadarpur, and Rudrapur blocks of the study area were found under the safe category; Swar and Meerganj blocks were found under the critical category whereas Milak and Shergarh blocks were found under the over-exploited category. The maximum and minimum stages of development were found at 109.08% and 59.31% at Shergarh and Rudrarpur blocks, respectively. The overall stage of development for the study area was 68.44% and the area as a whole may be put under the semi-critical category for the year 2010. In the present study, the physical-chemical properties of groundwater in shallow aquifers and their suitability for drinking, irrigation, and industrial uses were studied. The physical-chemical properties of the groundwater of the study area were determined using standard methods of water quality analysis. A comprehensive and proper groundwater recharge plan for the identified landforms with their prevailing geomorphic features in the study area has been suggested to maintain the groundwater at a safe and desired level in the future in the Jamrani Dam Command. Various water recharging structures namely: a series of check dams, percolation tanks, farm ponds and nallah bunds are most possible techniques for recharging groundwater aquifers by utilizing excess water available during monsoon season in the form of runoff obtained from the land surface. Geographic information Systems (GIS) and Remote Sensing were applied to the study area to delineate different land uses from the satellite imageries (IRS-1D). The study area delineated from the S.O.I. toposheets was also classified into nine land use classes i.e. agricultural land, grassland, water body, scrubland, and forest etc.
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Water is a precious natural resource for sustaining life, agriculture and environment. The dependability on groundwater has reached high in all time in recent decades due to reasons such as unreliable supplies from surface water due to vagaries of monsoon, increase in demand for domestic, agricultural and other purposes. Karnataka is largely dependent on groundwater to meet industrial, municipal, domestic and irrigation needs. So, Rainwater harvesting (RWH) forms an important component for development and management of water resources for domestic, agricultural, municipal and industrial uses. Management of scanty rain fall by rain water harvesting, Augmentation of depleting natural resources of water (deeper ground water table) and Management of poor-quality ground water and scope for conjunctive/domestic use is need of the hour. With increase in withdrawal of ground water, ground water (GW) table is declining at a rapid pace with an urgent need to recharge GW in addition to dilute poor quality ground water. Double ring technique of Groundwater Recharge consists of filtering the water at different layers using gradation materials generally the pebbles of different size with synthetic material wrapped around the casing pipe. By harvesting rain water and recharging into point recharge soaking infiltration gallery established at Irrigation Water Management Research Centre, (IWMRC) Belavatagi Tq: Navalagund has shown encouraging results as far as water quality, discharge and water table are concerned. The results of assessment of influence of ground water recharge through rainwater harvesting on ground water yield (lps), quality (dS/m) and fluctuations (feet bgl) during the year 2020, have shown that around 3.35 lakhs liters of water could be collected from rain water harvesting during the year 2020. Also, from point recharge through 7 recharge events (rain fall events from July to October 2020), it was observed that the considerable rise in the water table from more than 100 feet below ground level to around 22 feet below ground level, drastic reduction in groundwater salinity i.e. electrical conductivity (EC) of ground water from more than 10 dS/m to an average (EC) of 1.32 dS/m and tube well yield has significantly increased from 0.4 lps to around 2.4 lps. Therefore, Artificial recharge techniques through rainwater harvesting can be a better strategic approach to combat the emerging problems of water scarcity especially over exploitation of ground water and its quality deterioration.
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The shortage and contamination of sources of surface water, as well as the increasing demand for agricultural practices, groundwater is important for many domestic, commercial, and industrial purposes. Human health and agricultural yields were significantly affected either by quality and concentration levels of groundwater. 25 groundwater samples were used in this study, which has been conducted in five different mandals of the Palnadu region. The samples were obtained from a variety of bore wells using the random sampling method, and the physical and chemical characteristics of water quality parameters were evaluated. The study covered the maximum amount of groundwater in the five mandals of Nuzendla, Vinukonda, Savalyapuram, Romicharla and Ipur as well as the suitable treatment methods for trying to turn the water in to the potable form.
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Objectives: This study investigates the estimation of the fluoride concentration in drinking water in Rohtak district, Haryana, and quantifies its effect on the prevalence of dental fluorosis and dental caries. Materials and Methods: A cross-sectional survey was conducted among 1262 school children in endemic fluoride areas of Haryana. Using simple random sampling, thirty villages from five blocks of Rohtak districts were selected, and children 6–12 years of age were examined. A questionnaire survey form was filled out to record the demographic details of the samples. Dental caries was recorded according to DMFT (D = Decayed, M = Missing due to caries only, F = Filled, T = Teeth)/deft index (d = decayed, e = extracted due to caries, f = filled, t = teeth). Assessment of Dental Fluorosis was done according to Dean's Fluorosis index, modified in 1942. The data were analyzed using SPSS version 19, and nonparametric tests were used to assess the significance. Results: The study participants included 615 males and 647 females among which Mean DMFT in the area of study ranged from 0.32 to 1.90. Mean deft in the area of study ranged from 0.34 to 1.91. The fluoride concentrations in groundwater are in the range of 0.532–8.802. Out of 1262 children examined, 655 (51.90%) children were having dental fluorosis. 607 (48.10%) of the subjects were free from fluorosis. 16.09%, 13.39%, 9.11%, and 8.16% and 5.15% were having questionable, very mild, mild, moderate, and severe form of fluorosis, respectively. Conclusion: It can be concluded that in Rohtak district, the fluoride levels in drinking water and the prevalence of dental fluorosis are high, so requiring an urgent need to improve the quality of water and institute de-fluoridation of drinking water in affected areas to lower the burden of dental fluorosis in the community.
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RESUMO Fases líquidas não aquosas leves (LNAPL), como combustíveis líquidos, estão presentes em muitas áreas contaminadas. Para o gerenciamento dessas áreas, é importante conhecer a mobilidade desse produto, a fim de subsidiar decisões sobre sistemas de remediação e avaliação de risco. Uma alternativa para quantificar a mobilidade é o parâmetro transmissividade de LNAPL, ainda pouco aplicado no Brasil. Esse trabalho avaliou a aplicabilidade desse parâmetro em diferentes áreas contaminadas por LNAPL. Foram realizados testes em três áreas com litologias, tipos de contaminantes e históricos de contaminação distintos. Em alguns testes, não foi possível determinar a transmissividade de LNAPL devido à instabilidade do nível de fluidos, por consequência da operação de sistemas de bombeamento e precipitação, além de problemas operacionais durante a realização do teste. Apesar de ser um teste simples, em alguns casos, a determinação de transmissividade de LNAPL pode ser inviável, principalmente para LNAPL de baixa mobilidade por requerer testes mais prolongados. Os principais fatores determinantes no valor de transmissividade de LNAPL foram a litologia, a posição do poço na pluma e a posição do nível d'água em relação a série histórica. Assim, a transmissividade de LNAPL pode ser um parâmetro útil no gerenciamento de áreas contaminadas, cuja interpretação deve ser feita de forma cautelosa e integrada com outros dados de investigação da área.
ABSTRACT Light non-aqueous phase liquids (LNAPL), such as liquid fuels, are present in many contaminated sites. To adequately manage these sites, it is important to know the product mobility, to support decisions on remediation systems and risk assessment. One alternative to quantify mobility is to quantify the LNAPL transmissivity, which is rarely applied in Brazil. This work aimed to evaluate the applicability of this parameter in LNAPL contaminated sites with different conditions. Tests were performed in three sites, with different lithologies, types of contaminants and contamination histories. In some tests, it was not possible to obtain representative values of LNAPL transmissivity due to fluids levels instability, caused by pumping systems and precipitation events, and operational problems during the tests. Despite being a simple test, in some cases, the determination of LNAPL transmissivity may not be feasible, especially for low mobility LNAPLs, that require long period tests. The main factors controlling LNAPL transmissivity values were lithology, position of the well in the plume, and water level elevation in relation to the historical series. Thus, LNAPL transmissivity can be a useful parameter in the management of contaminated sites, but its interpretation must be made cautiously and integrated with other site data.
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RESUMO A crescente demanda e a diminuição da disponibilidade de água com qualidade devido à degradação constituem um desafio para os gestores dos recursos hídricos. As águas subterrâneas são recursos hídricos importantes que, em geral, apresentam boa qualidade. Porém, a elevação da contaminação das águas subterrâneas, causada principalmente por atividades antropogênicas e uso do solo, coloca em risco a segurança hídrica. A avaliação dos recursos hídricos subterrâneos e as decisões tomadas para proteção contra a degradação fazem parte de um processo complexo. A avaliação de áreas vulneráveis ao risco de contaminação é uma análise essencial para o planejamento e gestão. Neste estudo, utilizou-se metodologia multicritério para proposição de um modelo de avaliação da vulnerabilidade ao risco de contaminação por meio de informações de poços que fornecem água para o abastecimento público, destacando-se as áreas mais impactadas pela ação antropogênica. Doze poços foram avaliados quanto aos critérios: índice GOD, nitrato, potencial hidrogeniônico, sólidos totais dissolvidos e coliformes totais. A aplicação do método de multicritério AHP e TOPSIS resultou na ordenação dos poços que estão mais vulneráveis e que necessitam de medidas de proteção e controle de degradação. Os poços que são considerados mais vulneráveis estão localizados em meio urbano; assim, pode-se inferir que estão sendo degradados por efluentes lançados no solo sem o devido tratamento.
ABSTRACT The growing demand and the declining availability of quality water due to degradation are a challenge for water resource managers. Groundwater is a vital water resource that is generally of good quality. However, with the increase of contamination caused mainly by anthropogenic activities, water safety is put at risk. The assessment in groundwater resources and decision-making to protect against degradation is a complex process. Assessing areas vulnerable to contamination risk is an essential analysis for planning and management. In this study, we used the multi-criteria methodology to propose a model for assessing vulnerability to contamination risk through information from wells that provide water for public supply, highlighting the areas most impacted by anthropogenic action. Twelve wells were evaluated under the following criteria: GOD index, nitrate, hydrogen potential, total dissolved solids, and total coliforms. The application of the AHP and TOPSIS multi-criteria methods resulted in the ordering of the wells that are most vulnerable and that need protection and degradation control measures. The wells that are considered more vulnerable are located in urban areas, so it can be inferred that they are being degraded by activities by effluents released into the soil without proper treatment.
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ABSTRACT This research aimed to investigate the relation between sanitary situation and groundwater quality, using the concentration of nitrogenous compounds. The aquifer studied is unconfined and situated in the periurban zone of Fortaleza (NE Brazil). Through the Geographic Information System (GIS), a relational database was created using data from the IBGE demographic census (2011), to analyze numbers of households linked to septic tanks or rudimentary cesspit. The groundwater quality was evaluated based on nitrogen compounds (N-NH3 +; NO2 -; N-NO3 -), pH, and total dissolved solids (TDS). The highest concentrations of nitrates are found in areas with a higher density of septic tanks and rudimentary cesspit. Furthermore, nitrate was more present in water table above 6.6 m, mainly in the interfluvial zones, which have a high oxidation potential. The results contribute to the loss of contamination, based on the number of households with septic tanks and rudimentary cesspit, in unconfined aquifers, which were more vulnerable to contamination, mainly in peripheric expansions areas in the cities, where the deficit in sewage services tends to be high.
RESUMO Esta pesquisa teve como objetivo investigar a relação entre a situação sanitária e a qualidade da água subterrânea, usando concentrações de compostos nitrogenados. O aquífero estudado é do tipo livre e se encontra situado na zona periurbana da cidade de Fortaleza (NE Brasil). Através do Sistema de Informação Geográfica (SIG), foi criado um banco de geodados relacional utilizando dados do censo demográfico do IBGE (2011), analisando o número de domicílios vinculados a fossas sépticas e fossas rudimentares. A qualidade da água subterrânea foi avaliada com base em compostos nitrogenados (N-NH3 +; NO2 -; N-NO3 -), pH e sólidos totais dissolvidos (STD). As altas concentrações de nitrato estão associadas a maior ocorrência de fossas sépticas e rudimentares, principalmente. Além disso, a ocorrência do nitrato ocorre em áreas de níveis estáticos acima de 6,6 m, principalmente nos setores interfluviais, que apresenta alto potencial de oxidação. Os resultados contribuem para predição da contaminação, tendo em vista a quantidade de domicílios com fossas sépticas e rudimentares, sobre aquíferos livres, que são mais vulneráveis à contaminação, sobretudo em áreas de expansão periférica da cidade, onde o déficit de esgotamento sanitário tende a ser maior.
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En zonas insulares, la principal fuente de agua para el consumo proviene de pozos o acuíferos, por lo cual es importante conocer su distribución y calidad. El presente estudio tuvo como objetivo caracterizar el recurso hídrico subterráneo, a través de los pozos ubicados en la isla San Bernardo, como un aporte al desarrollo de la comunidad y la prevención de enfermedades de transmisión hídrica. Se determinó la ubicación y materiales de construcción de los pozos de agua y pozos sépticos, a fin de determinar el área de cobertura y distribución de estos. Se detectaron 15 pozos de agua construidos con diferentes materiales y diferentes profundidades. Se cuantificaron los coliformes totales, coliformes fecales, E. coli, enterococos y Pseudomonas. Igualmente, se midió el pH, salinidad, turbidez, sólidos disueltos totales y conductividad eléctrica. Todas las muestras de agua mostraron condiciones fisicoquímicas variables y contaminación microbiológica, lo cual la hace inapropiada para el consumo. Se determinó una distribución amplia del recurso y la necesidad de desinfección del agua. Se recomienda la organización de los pozos de agua a fin de lograr una distribución adecuada, el tratamiento del agua extraída de los mismos y la evaluación de la posible reubicación de los pozos sépticos
In insular areas, the main sources of water for consumption are wells or aquifers, so it is important to know its distribution and quality. The objective of this study was to characterize the water resources of the San Bernardo Island as a contribution to the community development and prevention of waterborne diseases. The area of coverage and location of wells and septic tanks, was determined, in order to establish their area of coverage and distribution. Fifteen water wells constructed with different materials and different depths, were detected. Total coliforms, fecal coliforms, E. coli, enterococci and Pseudomonas were quantified. Also, pH, salinity, turbidity, total dissolved solids, and electrical conductivity, were measured. All water samples showed variable physicochemical conditions, and microbiological contamination, making it unsuitable for consumption. The results showed a wide distribution of the resource and the need for water disinfection when used for human consumption. Water well organization to achieve adequate distribution, the treatment of water extracted from the wells, and an evaluation for relocation of septic tanks is strongly recommended
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Bioremediation is regarded as one of the most promising methods for the remediation of the soil and groundwater contaminated with organic compounds, mainly due to its cost-effectiveness and environmental friendliness. Using VOSviewer and CiteSpace, we analyzed all publications in this area in core database of Web of Science from 1990 to 2020. The number of publications in this area showed an increasing trend worldwide. The country with the largest total number of publications was USA, followed by China and India. Since 2012, the number of annual publications of China exceeded USA and ranked the first. The top three journals which published papers in this area were Chemosphere, Environmental Science & Technology, and Science of the Total Environment. The Chinese Academy of Sciences published the largest number of papers among the research institutions globally, but the University of California in USA had the highest total citations and h-index. Bibliometric analysis indicated that it is important to develop biotechnologies of bioremediation coupled with chemical/physical remediation to overcome the challenge of low efficiency and long remediation duration associated with bioremediation. In addition, the bioremediation on the mixed contaminants, such as organic contaminants and heavy metals, or mixtures of different organic contaminants, is an important direction. Finally, the rapid development of microbiome technologies will further promote the exploration of mechanisms involved in bioremediation on the genetic and molecular level.
Subject(s)
Bibliometrics , Biodegradation, Environmental , Groundwater , Publications , SoilABSTRACT
HIGHLIGHTS Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. An enzymatic method has been described by using arsenite oxidase for arsenic detection. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times.
Abstract Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. More attention has taken towards the arsenic due to its presence in ground water in India, China, Bangladesh, Inner Mongolia and several other regions of the world. It's been a challenge to remove arsenic due to the lack of its efficient detection approach in the complicated environmental matrix. The proposed method describes an enzymatic method for arsenic determination using arsenite oxidase, which catalyzes the oxidation of arsenite to arsenate. Hence, a colorimetric PVC strip with immobilized arsenite oxidase has been developed to detect the arsenic concentration and also having potential for the field-testing. The influence of the optimal conditions i.e. pH, temperature, storage stability, and reusability of free and immobilized enzyme were evaluated and compared. The results have shown that the stabilities were significantly enhanced compared with free counterpart. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times. We approve that this novel low cost immobilized carrier presents a new approach in large scale applications and expected to act as a model for establishment of indigenous arsenic sensor in miniature form.
Subject(s)
Humans , Arsenic/analysis , Polyvinyl Chloride/analysis , Water Pollutants, Chemical/analysis , Groundwater/analysis , Enzymes, Immobilized/analysis , Oxidoreductases , Biodegradation, EnvironmentalABSTRACT
ABSTRACT: Many areas of South America are directly affected by Arsenic (As) contaminated groundwater. A high percentage of the water samples taken in multiple areas of Argentina had As concentrations above the WHO level recommended guidelines. This condition was previously associated with an increased risk of chronic diseases, including different cancers. Long-term As exposure was proposed as a risk factor for Oral Squamous Cell Carcinoma (OSCC). The aim of this study is to present a series cases of Argentine patients diagnosed with OSCC who have consumed water contaminated with As for more than 10 years. Clinical data were obtained from the archive of Clinical Records Histories of the Oral Medicine Department of the Dentistry School, Universidad Nacional de Córdoba and Universidad Católica de Córdoba, Argentina. 15 cases of OSCC were included. The male: female sex ratio was 2:1. The average age was 66 years (31-89 years). Regarding location, the gum or edentulous alveolar ridge was the most prevalent site (6/15; 40 %), followed by the tongue margin. The average years of exposure to arsenical waters were 24 years (13 - 40 years of exposure). The majority of the presented cases were non drinkers non smokers. 60 % of the tumors were diagnosed at advanced stages. the epidemiological studies carried out in As-contaminated areas that address oral cancer should always incorporate the record of variables related to As exposure. Patients who live or lived at As-contaminated areas must be regularly followed up for early diagnosis of potentially malignant or malignant lesions. The high frequency of gum cancer among these cases, should raise awareness of periodontic specialists to perform a careful and thorough periodontal examination.
RESUMEN: Muchas regiones de América del Sur están directamente afectadas por aguas subterráneas contaminadas con arsénico (As). Un alto porcentaje de las muestras de agua tomadas en múltiples áreas de Argentina tenían concentraciones de As superiores al nivel aprobado por la OMS. Esta condición se asociaba previamente con un mayor riesgo de enfermedades crónicas, incluidos diferentes tipos de cáncer. La exposición a largo plazo se propuso como un factor de riesgo para el carcinoma oral de células escamosas (OSCC). El objetivo de este estudio es presentar una serie de casos de pacientes diagnosticados con OSCC que han consumido agua contaminada con As durante más de 10 años. Se obtuvieron datos clínicos del archivo de Historias de registros clínicos del Departamento de Medicina Oral de la Facultad de Odontología, Universidad Nacional de Córdoba y Universidad Católica de Córdoba, Argentina. Se incluyeron 15 casos de OSCC. La relación de género masculino: femenino fue de 2: 1. La edad promedio fue de 66 años (31-89 años). En cuanto a la ubicación, la encía o la cresta alveolar edéntula fue el sitio más frecuente (6/15; 40 %), seguido del borde de la lengua. El promedio de años de exposición a las aguas arsenicales fue de 24 años (13 - 40 años de exposición). La mayoría de los casos presentados fueron de pacientes no bebedores y no fumadores. El 60 % de los tumores fueron diagnosticados en etapas avanzadas. Los estudios epidemiológicos realizados en áreas contaminadas con As que abordan el cáncer oral siempre deben incorporar el registro de variables relacionadas con la exposición a As. Se debe hacer un seguimiento continuo de los pacientes que viven o que vivieron en áreas contaminadas con As para el diagnóstico temprano de lesiones potencialmente malignas. La alta frecuencia de cáncer de encías en estos casos, debe concienciar a los especialistas en periodoncia para que realicen un examen periodontal cuidadoso y completo.
Subject(s)
Humans , Adult , Middle Aged , Aged , Aged, 80 and over , Mouth Neoplasms/pathology , Squamous Cell Carcinoma of Head and Neck/pathology , Argentina , Arsenic/adverse effects , Mouth Neoplasms/therapy , Medical Records , Squamous Cell Carcinoma of Head and Neck/therapyABSTRACT
El crecimiento de la población humana y las actividades antropogénicas ha aumentado la tasa de contaminación del agua subterránea en el mundo, por lo que, la finalidad de este estudio es determinar la potabilidad del agua de cuatro pozos subterráneos de un área rural del estado Mérida, mediante la caracterización fisicoquímica y microbiológica, para comprobar la factibilidad de su uso como agua de consumo. Los resultados indican que los parámetros fisicoquímicos cumplen la normativa venezolana. Las aguas presentan una gran variedad de minerales destacándose Ca, Na y Mg como cationes mayoritarios y una dureza básicamente debía a iones bicarbonato. Los valores de la distribución isotópica, sugieren la existencia de dos acuíferos sin conexiones hidráulicas entre los pozos. El análisis bacteriológico y parasitológico detecta: bacterias heterótrofas, coliformes totales y Pseudomonas, así como, Ascaris spp., Blastocystis sp., Giardia sp., y Eimeria sp., probablemente procedentes del filtrado subterráneo de los pozos sépticos y percolado desde la superficie a través del suelo de textura franco arcilloso arenoso, microorganismos que se han adaptado a las características fisicoquímicas de las aguas. Los resultados demuestran que el agua de tres pozos, no puede ser utilizada para el consumo, sin previo tratamiento convencional como coagulación, filtración y cloración
Growth in human population and anthropogenic activities has increased the rate of groundwater pollution in the world, therefore, the purpose of this study is to determine the potability of water from four underground wells in a rural area of Mérida State, through the physicochemical and microbiological characterization, to check the feasibility of its use as drinking water. The results indicate that the physicochemical parameters comply with venezuelan regulations. The waters have a wide variety of minerals, highlighting Ca, Na and Mg as majority cations and a hardness basically due to bicarbonate ions. The values of the isotopic distribution suggest the existence of two aquifers without hydraulic connections between wells. Bacteriological and parasitological analysis detects: heterotrophic bacteria, total coliforms and Pseudomonas, as well as Ascaris spp., Blastocystis sp., Giardia sp., and Eimeria sp., probably derived from the underground filtration of septic tanks and percolated from the surface through the sandy clay loam soil, microorganisms that have adapted to the physicochemical characteristics of waters. The results show that the water from three wells cannot be used for consumption without some conventional treatment as filtration and coagulation, and disinfection process