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Abstract Follow up and removal of some chlorinated disinfection by-products from different water plants in El-Fayoum city by using green sorbent Degree: M. Sc. Unpublished master of Science thesis, Faculty of science-Fayoum University, 2015. Monitoring and modeling of the concentrations of trihalomethanes (THMs) within four water treatment plants (WTPs) and distribution lines in Fayoum City, Egypt, and using Poly urethane foam (PUF) as green sorbent for reduction of THMs on tap water were studied. Sampling sites for raw and treated waters were determined by global positioning system and the Arc geographic information system software was used for mapping. THMs were monitored using 25 sampling points located at the plant exit and through the distribution lines up to the plant extremity. Results indicated that the THMs concentration varied significantly but it was very rarely higher than the allowed maximum contaminant level of 100μg/L. However, at the dead zones in the distribution lines, the THMs increased by about 160% compared to in-plant level. Furthermore, the level of THMs in hot months was about 1.3 times higher than in cold ones. The influence of some independent variables such as temperature, pH, ammonia concentration, total organic carbon and color were investigated by Pearson model to find their correlation with the rate of THMs formation in WTPs. The resulted R values ranged from 0.81 to 0.98. Successful application of the model to a selected region on the distribution lines has resulted in a correlation coefficient of 0.98. On the other hand by using PUF as green sorbent for removing THMs the results shown that its efficiency increase by: increasing the sorbent weight till 87.8% with 20g sorbent/L sample, and by decreasing the flow rate of water where, the removal of TTHM increased till 82% at flow rate 2.5 mL/min. And the Breakthrough capacity of PUF was 7.92μg TTHM removed/g sorbent with sample flow rate 25 mL/min. UKeywordsU: trihalomethanes; water treatment plants; distribution lines; monitoring; modeling; polyurethane foam; B |