Controlling Disinfection by-Products via Enhanced Coagulation: A Case Study, El-Nobarya Drinking Water Treatment Plant, Egypt

Document Type : Original articles

Authors

1 Department of Environmental Sciences, Faculty of Science, Damietta University, Damietta, Egypt.

2 Beheira water and drainage company (BWADC), Beheira, Egypt.

3 General Manager of research and development sector, Holding Company for water and waste water, Cairo, Egypt.

Abstract

The present study aims to reduce Trihalomethane (THMs) level, residual aluminum and control filter run time in EL-Nobarya drinking water treatment plant via the application of enhanced coagulation technique. The effectiveness of the treatment process was evaluated in terms of the removal of natural organic matter (NOM), and the decrease in THM levels in the period from January to August 2020. First, the optimal coagulant dose (60-70 mg/L) for NOM removal was determined on bench scale and then applied on the plant. The results showed that NOM and THM concentrations were reduced by 28-44% and 25-35%, respectively. The residual aluminum varied from 0.1-0.13 mg/L compared to 0.18-0.26 mg/L using conventional treatment. In addition, the filter run time increased from 12 hours to 24 hours saving about 250 m3 of washing water for each filter. Enhanced coagulation was adopted as a controlling strategy for THM in EL-Nobarya plant and EL-Beheira water&drainage company (BWADC). Further control of chlorine dose and point of injection was needed for more reduction in THM.

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