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음폐수 이용 혐기성 소화의 내부 pH 조절에 따른 바이오가스 전환율 비교 및 미생물 군집도 분석
윤여명(Yeo Myeong Yun),조시경(Si Kyung Cho),정다영(Da Young Jeong),이은진(Eun Jin Lee),허관용(Kwan Yong Huh),신동혁(Dong Hyuk Shin),이창규(Chang Kyu Lee),신항식(Hang Sik Shin) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.8
본 연구에서는 음폐수를 이용 낮은 유기물 부하율에서 소화조 내부 pH 조절 유무에 따른 소화조 운전의 바이오가스 발생량 및 미생물 군집도 변화에 대한 비교 분석했다. 그 결과, 내부 pH를 조절하지 않은 반응조는 pH, Free ammonia, Volatile fatty acid의 증가에 의한 반응조 안정성이 떨어짐에도 불구하고 내부 pH 조절 반응조와 비슷한 바이오가스 전환율을 보였다. 이는 미생물 군집도 분석 결과에 따르면 외부환경에 대한 내성이 강한 Methanosarcina sp.의 우점에 의해 반응조의 안정성을 유지할 수 있었던 것으로 나타났다. In this study, the performance and microbial community of anaerobic digestion fed by food waste leachate at low organic loading rate were investigated with and without internal pH control. Experimental results show that similar biogas yield was achieved in both reactors regardless of increase in pH, the concentrations of free ammonia and volatile fatty acids in case of without internal pH controlled one. The results of a methanogenic community analysis by Polymerase Chain Reaction and Denaturing Gradient Gel Electrophoresis revealed that the apparent preponderance of Methanosarcina sp. could be one of reasons for the maintenance of reactor stability.
유상근,정윤진,허관용,정의근 대한상하수도학회 1997 상하수도학회지 Vol.11 No.2
The purpose of this study is to get optimum operating factors of Upflow Anaerobic Sludge Blanket (UASB) reactor by introducing methods that make it to reduce inhibition possible in each process wastewater treatment. The used substrates, concentrated corn starch liquid (CSL) wastewater, modified starch, filtering and decoloring wastewater, ion refining wastewater, and mixed wastewater including modified starch and not including modified starch, are generated from molasses process. The seeding sludge is the digested sludge that had been applied to molasses wastewater. Batch test to reduce the inhibition factors that might be existed in each wastewater was examined. Based on the this test, the optimum operating factors according to alkalinity and pH variation was studied through the continuous test using three 5.5 L UASB reactor. The first reactor added NaHCO_3 to control alkalinity. The hydraulic retention time (HRT) reduced to 8 hours and the organic loading rate increased gradually. The second reactor changed the pH of influent from 7.0 to 6.0 using NaOH. The third reactor was operated without changes to compare the above two reactors. As the result, the inhibition in concentrated CSL wastewater was removed by adding iron (II). When trace metals were added to mixed wastewater not including modified starch, the digestability by gas production rate increased to more fifty percentage than mixed wastewater that was not adding the trace metals. The reason that the inhibition did not decreased in spite of adding trace metals and nutrients was influenced by high concentration generated during the acid fermentation. The UASB reactors using the mixed wastewater with the most effective performance were operated as 500 mg/L as CaCO_3 alkalinity and 6.0 pH at steady state, and at this time, the gas production rates were 283 and 311mL gas/g COD_added. The COD removal rates were 84.7 and 86.3%, respectively.
상향류식 혐기성 입상슬러지 공법에 의한 전분폐수의 소화 특성
박영재,박철휘,홍승모,허관용 한국물환경학회 1994 한국물환경학회지 Vol.10 No.2
The purpose of this study is to develop the advanced and high efficient upflow anaerobic reactor and put in practical use. To achieve this purpose, we built 4 reactors. 25㎥ scale each, and brought the seeding sludge for filling the reactors from K sewage treatment plant. The reactors were designed based on labotary scale reactors performed before and operated with changing the settling compartment and GSS device. During the operation, we came to get the result of DW-process characteristics. The seperation rate of gas and solid was elevated by increasing contact area and R2, R3 and R4 reactor showed good protection efficiency of 30.2, 52.5 and 23.0% from wash-out of sludge. All of 4 reactors gave over 90% COD_(nm) efficiency, 8hr HRT 6-10㎏ COD/㎥/day OLR and over 80% methane content in gas produced in the reactors.