| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 99 === The process of water treatment plants consist of coagulation, flocculation, sedimentation and filtration. PAC is added to water in flash mixer basin on process of water treatment, but it increases the content of sludge in the same time. Dealing with sludge of the water treatment plat is a big problem in Taiwan. The main way of dealing with sludge is reclamation now. The reclamation are mostly reused as cement material, brick manufacture and cultivate soil. Moreover, sintering of lightweight aggregate is one way of the reclamation.
This study took sludge from the six water treatment plants as material to make lightweight aggregate. Before the test of sintered lightweight aggregate, we analyzed fundamental properties including the composing and physical character of the sludge.The chemical composition of six water treatment sludge were similar and major composition included SiO2, Al2O3 and Fe2O3; besides, it could be situated at C.M.Riley three-phase diagram. The result of toxicity characteristic leaching procedure (TCLP) was in line with standard. According to physical character, the specific gravity of six sludge were similar to general soil and all sludge were silt or clay which have plasticity and fine diameter. After the sintered test at the laboratory, we found the best sintered temperature and produced the sintered lightweight aggregate having pellet density below 1.8 g/cm3 and water absorption below 20％, which passed the requirement of the general lightweight aggregate. By changing the preheated temperature, we could discover that the sludge from Hsinch, Linnei, Kaotan, Chengcing lake water treatment plant could make the lightweight aggregate for structural and non-structural application in the same time, in the other hand, the sludge from Shinshan and Banxin only made lightweight aggregate for non-structural application. This study discovered the sludge from the six water treatment plants could be the material of sintered lightweight aggregate.
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