Water Quality and Formation of Trihalomethanes in New Azab Drinking Water Treatment Plant: Case Study
New Azab drinking water treatment plant is the largest treatment plant in Fayoum Governorate taking its raw water from Hassan Wassef stream, which is considered as the largest stream in Fayoum Governorate. It works with conventional chlorination system combined with fast sand filter technique for the treatment of raw water. To monitor water quality and to assess relation between organic matter and trihalomethanes (THMs) formation, different samples have been collected from inlet, flash mix, slow mix, sedimentation basin, filtration, and finally from plant outlet, in addition to samples from the related distribution system. The measured parameters were TOC, DOC, UV254, SUV, color, THMs, alkalinity, turbidity and conductivity. Obtained data revealed that New Azab DWTP works well for all the measured parameters, especially for the removal of suspended solids and color as values decreased from 20.3 NTU and 41mgL-1 Pt/Co at the plant inlet to 0.96 NTU and 3 mgL-1 Pt/Co at its outlet, respectively. Unfortunately, the treatment plant efficiency for the removal of total organic carbon is very low. Chlorine reacts with natural organic matter (NOM) that has not been completely removed during the treatment and forms trihalomethanes (THMs) represented by chloroform, bromodichloromethane, dichlorobromo methane and bromoform. The total concentration of THMs ranged between 15.44 and 50.88 Âµg/L with the highest concentration in summer season.
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