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이준표(Joonpyo Lee),강호(Ho Kang),김치열(Chiyeul Kim),송석헌(Seokheon Song),현재혁(Jaehyuk Hyun) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.1
To optimize the operation parameters of a food waste biogas plant, the physico-chemical properties of food waste, leachate, and their hydrolysis characteristics, and rate were investigated by a survey and experiments. Food waste analysis during the survey revealed a pH of 4.92, TS of 16.25%, VS of 13.9%, TCODCr of 145,100 mg/L, SCODCr of 58,600 mg/L, T-N of 4,665 mg/L, T-P of 823 mg/L on average. Leachate analysis revealed a pH of 4.40, TS of 6.83%, VS of 6.17%, TCODCr of 80.635 mg/L, SCODCr of 40,700 mg/L, T-N of 3,747 mg/L, and T-P of 389 mg/L on average. The rate constants, k1 and k2, of hydrolysis with a mixture of the above mentioned food waste and leachate were determined by hydrolysis experiments at different temperatures with different TS concentrations. As a result, the optimal reaction time was determined to be less than 2 days and the maximum hydrolysis rate was shown to be 32 to 64%. This data is very useful for improving the operation and basic design of biogas plants using food waste and leachate as feed.
음식류 폐기물을 이용한 간헐주입 연속혼합 혐기성 소화조의 성능인자 평가
이준표(Joonpyo Lee),강호(Ho Kang),정지현(Jihyun Jeong),이관영(Kwanyoung Lee),현재혁(Jaehyuk Hyun) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.4
A semi-continuously fed and mixed reactor (SCFMR) was tested with food waste as a substrate. Biogas and methane production, and the total volatile solids (TVS) removal was investigated by changing the operating parameters, such as input total solid (TS) concentration and/or retention time (HRT) in the reactor. With the test of the input TS 10% and 30 days HRT 0.35 N㎥ methane was produced from 1 kg TVS removal. In the case of input TS 15% and 40 days HRT, 0.34 N㎥ methane per kilogram TVS was produced. the removal of TVS calculated from biogas production and TS input were 65.7% and 62.9%, respectively. The reactor was estimated to be operated in an over-loaded condition. Hence, the HRT should have been increased for the optimal operation. In conclusion, the operation parameters of SCFMR with food waste was proposed by experiments, and the data could be used for the basic design of a pilot or commercial biogas plant for food waste treatment.
이준표(Joonpyo Lee),박순철(Soonchul Park),강호(Ho Kang),왕창근(Changkeun Wang),현재혁(Jaehyuk Hyun) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.3
Biogas plants using food waste and other organics as a substrate to produce biogas for energy utilization were analyzed for their economic feasibility. In the case of anaerobic digestion of food wastes alone, the economic feasibility of biogas production was quite low. Therefore, it is essential to increase the government subsidy for the construction of biogas facilities. In the case of food waste leachate, it was economically feasible without government support. Currently, approximately 30% of food waste leachate was processed in the biogas facility. The number of them are expected to increase gradually in Korea. The co-digestion of food waste leachate and livestock manure was not economically feasible, but it is expected that the number of facilities will increase as the government subsidies can compensate the loss. The co-digestion of food waste and food waste leachate will help improve the economics of food waste biogas facilities. Among the food waste and other organic treatment processes, biogas production from food waste leachate by co-digestion was found to be more feasible than the other options. Overall biogas production using food waste leachate should be encouraged continuously by government.