| Summary: | 碩士 === 東海大學 === 環境科學系 === 93 === Large amount of excess waste activated sludge (WAS) discharges from the municipal 2nd treatment plant may generate tremendous solid waste and disposal problems. Therefore, the minimization and reutilization of WAS are important topics to deal with. In this study, the pellets were made of various mixed ratios with WAS, local red soil and chemical additive (A) and then baked at 800℃ for 1 hr. The optimal formula of pellets is 6: 5: 1 (WAS: red soil: additive) and with water absorption, density, and compressive strength of 60.49 %, 0.67 g/cm3 and 2.44 kgf/cm2, respectively. The leachates of pellets also meet Toxicity Characteristics Leaching Procedure (TCLP) test. The pellets were used as immobilized media in biological SND process. The result showed the satisfactory (90 %) SND efficiency of the immobilized system under aerobic condition (DO = 1~2 mg/L) with an ammonium loading rate of 0.019 g-NH4+-N/g-VSS/day. The Nernst equation can provide the practical information such as ORP control in a biological treatment for using on-line control strategy.
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