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Abstract Several experiments were conducted on removal ratio of algae upto84,1%. When aluminum sulphate was used injunction with bentonite sodium, bentonite calcium, or bentonite iron, the maximum removal ratios of algae achieved were 81.9%, 89.3%, and 86.0% respectively,plain sedimentation gives a removal ratio of algae not exceeding 63.7%. 2. Reuse of primary chemical sludges cropped from the treatment of raw water with aluminium sulphate or aluminum sulphate aided with different coagulant aids in junction with a new chemical doses of coagulant and coagulant aids in treating a new water samples. These series of experiments proved that aluminum sulphate with bentonite calcium in the presence of returned sludge give best results. The removal ratio of algae by this method of treatment approached 99%. 3. Reuse of primary chemical sludge-cropped from the treatment of raw water with aluminum sulphate or aluminum sulphate aided with different coagulant aids-after being treated with calculated amount of concentrated sulphuric acid. The chemically treated sludge was considered raw water samples collected from two sources. The first was the river Nile at Roda water treatment plant. The second source was lsmalia canal at Mostorod water treatment plant. The purpose of this work was to de- velop a suitable method for water treatment that achieve high removal ratio of algae from raw water. Ac- cordingly the following methods of treatment were inves tigated : 1. Use of coagulants with or without coagulant aids for algae removal from raw water samples as descriped below : * Aluminum sulphate only as coagulant. * Aluminum sulphate and bentonite sodium as coagulant aid. * Aluminum sulphate and bentonite calcium as coagulant aid. * Aluminum sulphate and bentonite iron as coagulant aid. The outcome of these series of experiments indicated that the processes of chemical coagulation and sedimentation using aluminum sulphate as coagulant give |