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장영복,정태영,차기철,정형근,김성헌,김동진,유익근 한국물환경학회 2004 한국물환경학회지 Vol.20 No.4
The characteristics of H₂ production from livestock wastewater were investigated through an anaerobic acid forming process using Clostridium beijerinckii and the photosynthetic process using Rhodobacter sphaeroides. The submerged separation membrane was installed in the acid forming reactor. The photosynthetic process is composed of two reactors(photosynthetic reactor 1 and photosynthetic reactor 2) which is connected continually. The removal rate of COD and the production of volatile fatty acid(VFA) in the acid forming process were approximately 50% and 1000㎎/ L, respectively. The 70% of COD in the effluent of acid forming process was removed through the photosynthetic process. The production of H₂ in the photosynthetic reactor 1 and 2 was 50 and 25mLH₂/gVFA_(COD), respectively. The values of Y in acid forming reactor, photosynthetic reactor 1 and 2 was 0.2263, 0.0601 and 0.0393, respectively. The acetic acid and butyric acid produced in acid forming process were converted to H₂ by photosynthetic bacteria.
막분리혐기성 소화공정에 있어서 기질분해와 세균군의 분포특성
차기철(Gi Cheol Cha),정형근(Hyung Keun Chung),김동진(Dong Jin Kim),김영철(Young Chul Kim) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
Experimental study of anaerobic digestion process combined with and without the submerged separation membrane was investigated by using laboratory-scale reactor at the hydraulic retention time of 0.5 day and 1.0 day. The removal efficiencies of carbohydrate at the digester without and with membrane were 84.4 to 86.8 % and 99.6 to 99.7 %, respectively, and the methane gas recovery efficiencies were 0.4 to 1.2 % and 12.3 to 28.7 %. According to the measurement by the most probable numbers method, the numbers of various groups of bacteria in the digesters with membrane were enumerated in the following ranges ; acidogens 1.7×10^9 to 5.0 × 10^9 MPN/㎖, homoacetogens : 5.0×10^7 to 2.4×10^8 MPN/㎖, H₂-utilizing methanogens : 1.3×10^7 to 9.2×l0^8 MPN/㎖, and acetate-utilizing methanogens : 2.3×10^6 to 2.0×10^8 MPN/㎖. The number of methanogens at the digester with membrane increased by approximately 10² to 10⁴ times in comparison with that of the digester without membrane.
차기철 ( Cha Gi Cheol ),유영욱 ( Yu Yeong Ug ),이명규 ( Lee Myeong Gyu ),김동진 ( Kim Dong Jin ),유익근 ( Yu Ig Geun ),엄태규 ( Eom Tae Gyu ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
The relationship between SMP (soluble microbial products) and membrane fouling in the MBR (submerged hollow-fiber membrane bio-reactor) was investigated. The phenol was used as a substrate. The MBR was performed under condition that SMP concentration is changed from 20㎎/L to 60 ㎎/L. The membrane fouling increased with increasing of SMP concentration. The effect of resistance values on the membrane fouling was the order of R_(c)>R_(g)>R_(f)>R_(m). The increase of viscosity and non-biodegradable matters in the MBR was closely connected with the SMP concentration. The concentration of SMP should be kept less than 40 ㎎/L for stable operating of MBR. The T_(max) (time for maximum) decreased with increasing of SMP concentration. The removal rate of organic matters and total nitrogen in the MBR showed over 98% and 90%, respectively.
침지형 중공사막분리 활성오니법을 이용한 식품폐수처리에 있어서 동력학적 특성
차기철(Gi Cheol Cha),정태영(Tae Young Jeong),권택훈(Taek Hoon Kwon),정형근(Hyung Keun Chung),김동진(Dong Jin Kim) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.1
The kinetic of metabolism was investigated by using the submerged hollow fiber membrane separation activated sludge process, with HRT of 8 hours which the food wastewater was fed as a substrate. The kinetic model was studied under the unsteady state and the steady state condition. The concentration of MLVSS was increased by the time course and maintained about 10,000㎎/L after the first 70days. The yield factor(Y) and decay coefficient(K_d) were calculated as 0.7218㎎ VSS/㎎ COD and 0.1666day^(-1) at the unsteady state condition, respectively. At the steady state condition. Y and kd were calculated as 0.00068㎎ VSS/㎎ COD and 0.0002day^(-1), respectively. The resistance values of R_c, R_g, R_f, and R_m were calculated as 25.97×10^7m^(-1), 1.97×10^7m^(-1), 0.29×l0^7m^(-1) and 0.02×10^m^(-1), respectively.