[Investigating the efficiency of UV/H[2]O[2] process for removal of linear alkylbenzene sulfonate [LAS] in aqueous solutions]

Surfactants are one of the largest pollutants which exist in urban and industrial wastewaters. Large quantities of surfactants have entered to the environment since last decade due to increased use of synthetic detergent in industrial and home consumptions.In this study, the efficiency of UV/H[2]O[2] process in removal of linear alkylbenzane sulfonate [LAS] from aqueous solutions was investigated. In this study methylene blue active substane[MBAS]method and spectrometery were used to determine anion and residual surfactant respectively. In this study important variables were H[2]O[2] concentration, initial concentration of surfactant, pH and duration of UV radiation. The effect of UV/H[2]O[2] process on the degradation of LAS was analyzed statistically by using Multiple Linear Regression test. The resulted showed that after 20 minute, ultraviolet radiation solely removed 38.44 percent of Anionic detergent, Hydrogen peroxide showed no significant removal of detergent solution in the time course study. The efficiency of UV/H[2]O[2] process in 10, 20 and 30 minute were to 86.2, 90 and 96.5%, respectively. The results showed that the efficiency of ultraviolet radiation and hydrogen peroxide process in anionic detergent was not significant thoogh it was considerable in combination process [UV/H[2]O[2]]

[Survey of bacteriological quality of the drinking water in rural areas of Saqqez city]

Safe drinking water providing is one of the main purposes in the community. Development and improvement of community is related to the public health. In this study we studied the bacteriological quality of 116 villages under coverage of the water and wastewater companies in rural areas of Saqqez in.1386 Material and Drinking water of these rural areas have provided of deep, semi-depth- wells and spring water sources. Because in numerous rural areas both sources of drinking water and in some of them different sources of drinking water were used [old and new storage water source], in general, 359 samples were collected and transferred to the laboratory for testing to evaluate its quality. We also used linear Regression statistical analysis for collected data. results show that residual chlorine in drinking water in 33.88 percent of rural areas population were in range 0.2-1 mg/l. For 98.3 percent of the seqqez rural population, the turbidity was lower than the maximum permissible levels of drinking water standards of Iran [5 NTU]. There was no any E.coli contamination in 88 percent of drinking water in saqqez rural areas. Based on WHO guidelines concerning the microbial quality of water published in 2006 the average indicator for lack of E.coli in water of rural areas of seqqez was 88 percent and water is safe or good for drinking