الفهرس 
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Abstract
The evaluation of treatment standards, as well as the ecological and political paradigms to minimize the use of chemicals, has resulted in the development of innovative wastewater treatment technologies in Germany, including an activated sludge process called the adsorption / bio - oxidation process.
The researcher aimed to develop a system which can be expanded in steps and which will lead to a procedure being able to eliminate BOD5 and COD as far as possible. And also study the effect of Heavy material like Fe and Lead on this system. Also while Total Dissolved Solid (TDS), Phosphate (PO4) and Nitrate (NO3) in most cases can be eliminated by biological procedures, only maximize of biological elimination can be reached related to requirements.
The principal item of the research work was not to develop the entire purification system, but to study on the first stage (A-stage) of the multiple-stage plant (AB-system) parallel with the last researches to develop the first stage (A-stage) in such a way that, in a comparison with the single activated sludge stage system.
A pilot plant (135L/hrs) was constructed at one of pump station in the industrial area in the south of Port Said. It was designed according to the highly loaded activated sludge stage (A-stage) of the multiple- stage plant (AB-system) to simulate between the biological and chemical clarification with the addition of ferric chloride to the aeration tank.
The pilot plant was examined the elimination efficiency of BOD5, COD, Fe, Lead, TDS, PO4 and NO3 without and with adding the chemical precipitants like Alum Salts in the influent of A-stage in the first treatment stage.
The main purpose of the experimental study was to investigate the effect of Lead and Iron as heavy material on the A-system. In addition, improve the efficiency of this system by adding different dosages of chemical precipitants (Alum. salts) to the influent of the aeration tank of the A-stage, n the elimination efficiency of lead and iron removal, COD, TDS, PO4 and NO3 and BOD5 with Alum salt dosage ranging from 100 to 250mg/l were tested in this study.