ABSTRACT
The COVID-19 era has profoundly affected everyday human life, the environment, and freshwater ecosystems worldwide. Despite the numerous influences, a strict COVID-19 lockdown might improve the surface water quality and thus provide an unprecedented opportunity to restore the degraded freshwater resource. Therefore, we intend to investigate the spatiotemporal water quality, sources, and preliminary health risks of heavy metal(loid)s in the Karatoya River basin (KRB), a tropical urban river in Bangladesh. Seventy water samples were collected from 35 stations in KRB in 2019 and 2022 during the dry season. The results showed that the concentrations of Ni, Cu, Zn, Pb, Cd, and Cr were significantly reduced by 89.3-99.7 % during the post-lockdown period (p < 0.05). However, pH, Fe, Mn, and As concentrations increased due to the rise of urban waste and the usage of disinfectants during the post-lockdown phase. In the post-lockdown phase, the heavy metal pollution index, heavy metal evaluation index, and Nemerow's pollution index values lessened by 8.58 %, 42.86 %, and 22.86 %, respectively. Besides, the irrigation water quality indices also improved by 59 %-62 %. The total hazard index values increased by 24 % (children) and 22 % (adults) due to the rise in Mn and As concentrations during the lockdown. In comparison, total carcinogenic risk values were reduced by 54 % (children) and 53 % (adults) in the post-lockdown. We found no significant changes in river flow, rainfall, or land cover near the river from the pre to post-lockdown phase. The results of semivariogram models have demonstrated that most attributes have weak spatial dependence, indicating restricted industrial and agricultural effluents during the lockdown, significantly improving river water quality. Our study confirms that the lockdown provides a unique opportunity for the remarkable improvement of degraded freshwater resources. Long-term management policies and regular monitoring should reduce river pollution and clean surface water.
Subject(s)
COVID-19 , Metals, Heavy , Water Pollutants, Chemical , Child , Adult , Humans , Rivers , Ecosystem , COVID-19/epidemiology , Bangladesh , Environmental Monitoring/methods , Communicable Disease Control , Metals, Heavy/analysis , Water Quality , Risk Assessment , Water Pollutants, Chemical/analysisABSTRACT
In this study a rapid and short Strategic environmental assessment (SEA) conducted to find the existing policy and legal gaps of biomedical waste management regulations during the COVID-19.15 Key Informant Interviews (KIIs) were taken from the regulatory bodies, public and private medical college hospitals, corporations, civil societies, and the third-party organization involved in medical waste management. A DPSIR framework and SWOT analysis shows that the existing biomedical waste management suffers from institutional conflicts, lack of monitoring, and environmental regulations. The revised rules must be implementable with “3-R policy”, and “polluter pays principle,” and environmental impact assessment guided by SEA.
ABSTRACT
The COVID-19 pandemic has caused a global emergence, and the absence of a proven vaccine or medicine has led to the implementation of measures to prevent and control the spread of the virus. Wearing protective equipment like mask and gloves, washing hands via soap, frequent use of antiseptic solution and maintaining social distance are being applied globally to reduce the transmission rate. Therefore, this study was intended to investigate water, sanitation and hygienic (WASH) behaviour, protective equipment use and their disposal practices among Bangladeshi residents amid the COVID-19 pandemic. Based on the study aims, data were collected mainly via an online survey and analysed through a set of statistical tools including T test, one-way ANOVA and principal component analysis (PCA). This study found that almost 89.80% of the respondents reported to know about the COVID-19 and its preventive measures. WASH status of the respondents is found quite good, where 94.60% stated to have available potable water, 99% have improved toilet facilities, 95% wash their hands via soap, and 79.80% clean their house and toilets by antiseptic solutions properly. Moreover, nearly 94.50% and 54.80% people reported to use face mask and hand gloves, respectively, but the disposal practice of these protective equipment is inappropriate. More than 50% of people reported disposing of their used mask, gloves and tissue with other household wastes, which is alarming for public health and environmental perspective. Moreover, the WASH and waste disposal practices of the marginal people were found very poor and not at a satisfactory level. The results of statistical analysis focused on WASH and waste disposal practices as well as the factors which influence these practices. It is found that gender, occupation, area of residence, and level of education of the participants mainly influence the WASH and waste disposal practices. It is expected that this study exposed the necessity to introduce proper infectious waste management policy and also the increase in awareness level among mass people regarding the preventive measures of COVID-19 infection to combat against disease transmission and environmental pollution. Supplementary Information: The online version of this article (10.1007/s10668-020-01151-9) contains supplementary material, which is available to authorized users.