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하수처리장 에너지 자립화를 고려한 고도화학침전 슬러지의 메탄잠재력 평가
천민선 ( Minsun Chun ),김형호 ( Hyoungho Kim ),배효관 ( Hyokwan Bae ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
By introducing chemically enhanced primary treatment (CEPT) in a sewage treatment primary treatment stage, the sewage organic matter can be efficiently recovered. Because the CEPT sludge contains a high biodegradable organic matter in volatile solids (VS), it is feasible to convert the collected CEPT sludge into energy through anaerobic digestion. This study examined the properties and biochemical methane potential (BMP) of the CEPT sludge obtained from a sewage treatment plant located in an ocean area. The CEPT sludge contains a higher VS content of 37311 mg-VS/L, which is higher than that of conventional activated sludge (CAS), 33352 mg-VS/L. Also, total and soluble chemical oxygen demand were 57129 and 1458 mg/L, respectively. In the methane generation reaction, the lag period was short as a level of 1-2 days. The BMP for the CEPT sludge was 566 ㎥-CH<sub>4</sub>/kg-VS which is better than that of CAS as 363 ㎥-CH<sub>4</sub>/kg-VS. Unfortunately, the CEPT sludge showed a high salinity as 0.59 mg/L probably due to the saline sewage. Due to the salinity, the repeated BMP test in a sequencing batch reactor showed significantly low the methane production rate. The mixture of 25% CAS and 75% CEPT was optimal for the BMP test which is suitable for the co-digestion.
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에너지 생산형 하수처리장을 위한 가용 기술과 통합관리 방안
송민수 ( Minsu Song ),김형호 ( Hyoungho Kim ),배효관 ( Hyokwan Bae ) 한국물환경학회(구 한국수질보전학회) 2020 한국물환경학회지 Vol.36 No.1
Because of the intensified environmental problems such as climate change and resource depletion, sewage treatment technology focused on energy management has recently attracted attention. The conversion of primary sludge from the primary sedimentation tank and excessive sludge from the secondary sedimentation tank into biogas is the key to energy-positive sewage treatment. In particular, the primary sedimentation tanks recover enriched biodegradable organic matter and anaerobic digestion process produces methane from the organic wastes for energy production. Such technologies for minimizing oxygen demand are leading the innovation regarding sewage treatment plants. However, sewage treatment facilities in Korea lack core technology and operational know-how. Actually, the energy potential of sewage is higher than sewage treatment energy consumption in the sewage treatment, but current processes are not adequately efficient in energy recovery. To improve this, it is possible to apply chemically enhanced primary treatment (CEPT), high-rate activated sludge (HRAS), and anaerobic membrane bioreactor (AnMBR) to the primary sedimentation tank. To maximize the methane production of sewage treatment plants, organic wastes such as food waste and livestock manure can be digested. Additionally, mechanical pretreatment, thermal hydrolysis, and chemical pretreatment would enhance the methane conversion of organic waste. Power generation systems based on internal combustion engines are susceptible to heat source losses, requiring breakthrough energy conversion systems such as fuel cells. To realize the energy positive sewage treatment plant, primary organic matter recovery from sewage, biogas pretreatment, and co-digestion should be optimized in the energy management system based on the knowledge-based operation.
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하수처리장 에너지 자립화를 위한 고도화학침전 슬러지의 메탄잠재력 평가
천민선 ( Minsun Chun ),김형호 ( Hyoungho Kim ),배효관 ( Hyokwan Bae ) 한국물환경학회(구 한국수질보전학회) 2020 한국물환경학회지 Vol.36 No.4
By introducing chemically enhanced primary treatment (CEPT) in the first stage of sewage treatment, organic matter in sewage can be effectively recovered. Because CEPT sludge contains a high biodegradable organic matter in volatile solids (VS), it is feasible to convert the collected CEPT sludge into energy through anaerobic digestion. This study examined the properties and biochemical methane potential (BMP) of the CEPT sludge obtained from a sewage treatment plant located in an ocean area. The CEPT sludge contains a VS content of 37,597 mg/L, which is higher than that of excessive sludge (ES), i.e., 33,352 mg-VS/L. In the methane generation reaction, the lag period was as short as 1 to 2 days. The BMP for the CEPT sludge was 0.57 m<sup>3</sup>-CH<sub>4</sub>/kg-VS<sub>removed</sub> which is better than that of ES, i.e., 0.36 m<sup>3</sup>-CH<sub>4</sub>/kg-VS<sub>removed</sub>. Unfortunately, the CEPT sludge showed a high salinity as 0.56∼0.75% probably due to the saline sewage. Due to the salinity, repeated BMP testing in a sequencing batch reactor showed significantly low methane production rates and BMPs. Also, the ES showed a strongly reduced BMP when the salinity was adjusted from 0.20 to 0.70% by NaCl. The ES mixture with higher CEPT content showed a better BMP, which is suitable for co-digestion. Besides, anaerobic digestion for 100% CEPT sludge can be a considerable option instead of co-digestion.
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