الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The work done in this study was devoted to the development of a procedure to produce bricks from water treatment plant sludge as a modern way for sludge management. A large quantity of sludge is generated each year from water treatment plants in Egypt. Disposing of the water treatment plant sludge to the nearest watercouser is the common practice in egypt, which accumulatively rise the aluminum concertrations in water and consequently in human bodies. The aluminum`s contributory influence has been linked to accurrence of Alzheimer`s disease. Landfill disposal of the sludge is impractical because of the high cost of transportation and depletes the capacity of the handfill. Recovering and reusing of the coagulants alum, at the drinking and sewage treatment plants, may reduce both raw material and disposal costs if the needed technology is available. However, this recovered alum, if reused as a coagulant, has a trilalomethane formation potential during chlorination stage of water treatment, because of the additional quantity of algae that contained in the reused sludge. The trihalomethanes are suspected carcinogens. Among all the points, the use of sludge in manifacturing of constructional elements is considered to be the most economic and enviromentally sound option.
Due to the similar mineralogical composition of clay and water treatment plant sludge, this study focused on the use of sludge in clay-brick making. The study investigated the use of sludge as a complete or partial substitute for clay or shale in brick manufacturing. At first, trials performed to use the sludge as a complete substitute for clay. In this trend, four different series of sludge and clay proportioning ratios were tried, which exclusively involved tha addition of sludge with ratios 50.60.70 and 80 percent of the total weight of sludge-clay mixyure. Each series involved the firing of bricks at 950.1000.1050 and 1100c. giving 16 different brick types. The evaluted according to E.S.S from the obtained ressults, it was concluded that by operating at the temperature commonly practiced in the brick klin, 50 percent was the optimum sludge addition to produce brick sludge-clay mixture.