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매립지가스(LFG)추출 이용기술 개발에 관한 기초연구(Ⅰ)
이승무,홍지형,유재성,손성섭,김성규,이용현 동아대학교 환경문제연구소 1990 硏究報告 Vol.13 No.3
This study was concerned with the first year's results of the research project scheduled for 3 years to mainly study an efficient and economically feasible process of landfill gas extraction. It includes the proximate and chemical analysis of municipal solid wastes in underground. And the test operation of pilot plant for landfill gas extraction with monitoring Nanzi island landfill site was carried out to investigate the radius of influence in gas extraction and gas composition. The results of the study were summarized as follows; 1. The proximate analysis of anaerobically decomposed refuse in the ground was measured 45.5% of ash, 35.1% of moisture, and 19.4% of combustibles in which the carbon content was about 65% from chemical analysis. 2. The major composition of LFG was measured about 54 to 55% of CH₄and 34 to 37% of CO₂which was revealed to be high quality of the gas for utilization 3. From the results of the test operation, the radius of influence was predicted to be 67m from the extraction well at the operating conditions, such as 2㎥/min. of extraotion flow rate, and -300mmH₂O of suction pressure at gas blower. 4. Under the theoritical correlation of steady state condition where the gas generation rate is equal to withdrawal rate, gas generation rate was predicted to be 0.011㎥/kg·yr from the operating parameters such as withdrawal rate(2㎥/min.) and radius of influence(67m).
홍지형,박진원,이승무 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.2
This study was carried out to investigate the removal of color stuffs, such as disperse dye stuffs which is contained in water as suspended particulates, by electroflotation. In order to do this, the batchwise experimentation of electroflotation was studied in backmix reactor which changing the important parameters, such as current density, pH, concentration of color stuffs, identification of electrodes, size of bubbles formed, etc. From the results of this experiment, the removal rate equation of color stuffs was derived which mathmatical assumptions from the collection theory between the bubbles formed by electrolysis and suspended particulates, as follows; -dc/dt=(??)C Where ??=3.968x10²(㎛/A.min) where Ec is the single bubble collection efficiency defined from collection model. In addition to this, continuous experiments were also operated in CSTR and column type reactors sacrified and nonsacrified electrodes, thereby obtained the optimum performance, such as 6-8 of pH, and 40 to 60 mA/㎠ of current density in 10 to 15 minutes of retension time with sacrified Al anode, in column type electroflotation reactors, with 99% of removal efficiency. The size distribution of the generating bubbles during the electrolysis was well expressed by the logarithim normal distribution function whereby obtained the effective mean bubble diameters H₂and O₂in the range of 5 to 20㎛ and 150-200㎛, respectively.