| Summary: | 碩士 === 嘉南藥理科技大學 === 環境工程與科學系暨研究所 === 95 === In this study, the waste-derived porous ceramic was used as a microbial carrier to establish an on-site pilot plant for the treatment of stripper wastewater from an electronic industry. The pilot plant consisted of four components by influent storage, bioreactor, settling tank and sludge return system, respectively. Five cells were set in bioreactor and the plastic basket contained microbial carrier was entrapped in the last three cells. The sludge was returned from the settling tank to the first cell of bioreactor to enhance the performance of this system.
Flow rate, hydraulic retention time (HRT), food/microorganism ratio (F/M ratio) and organic loading rate (OLR) were controlled and evaluated in this pilot study. Chemical oxygen demand (COD) was used as a parameter for the examination of system efficiency. Two stages of the test were carried out in this study according to two different flow rates. As for the first stage, the system was controlled under the condition with a flow rate of 1.1 ~ 1.4 CMD, a HRT of 7.6 ~ 9.3 hrs, a F/M ratio of 0.3 kg-COD/kg-MLSS-day and the OLR was in the range of 0.5 ~ 2 kg-COD/m3.day. The results showed that 85% of COD removal can be achieved and the effluent SS concentration was in the range of 10 ~ 55mg/L. On the second stage, the higher flow rate of 1.4 ~ 1.8 CMD and shorter HRT of 5.8 ~ 7.4 hrs were set to enhance to treatment capacity of this pilot system. The results showed that the COD removal was higher than 90% with a effluent SS concentration in the range of 5 ~ 30mg/L.
This pilot study indicated that the PCBR (Porous Ceramic as Microbial Carrier of Bioreactor) is feasible for the treatment of stripper wastewater and with several benefits including footprint save and the initial capital cost reduction.
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