الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The present study aimed to reveal a comparison between different coagulants that not used in Egyptian drinking water treatment by the mean of detection of disinfection by products (DBPs) quantity. Also, direct relationship was studied to see the effect of pre-chlorination step which is mainly used in drinking water treatment plants for disinfection and as a buffering agent to make the alum works properly.
The current study was concerned with the removal of natural organic matter (NOM) persist in water, and the detection of trihalomethanes (THMs), haloacetic acids (HAAs) and total organic halides (TOX) as an important parameters of organic DBPs which considered as a cancer causing agent.
The optimum conditions for each coagulant activity were experimentally detected. Different factors affecting the coagulants activity were examined such as pH (enhanced coagulation) and NOM removal.
All the instrumental data obtained by chromatographic techniques and TOX analysis confirmed the formation of DBPs as a result of chlorination after treatment with much less levels than evolved monthly in annual analysis of EL- Fustat water treatment plant, The study showed that the effect of the different coagulants on evolved DBPs. DBPs formed as a result of chlorination of NOM containing water. Therefore, reducing the chlorine doses as much as possible to reach zero free chlorine before post-chlorination and the minimum acceptable free chlorine residual for secondary disinfection is going to reduce the THMs and HAAs levels substantially.
Using high pre-chlorination doses for the whole year at El-Fustat WTP is considered a poor practice, which needs to be reconsidered. The pre-chlorination dose should be tailored to the pre-chlorination goal that should change seasonally.