서지주요정보
UBF 반응조를 이용한 단일 반응조에서의 탈질과 메탄화 = Simultaneous denitrification and methanogenesis in a single-stage hybrid type UBF reactor
서명 / 저자 UBF 반응조를 이용한 단일 반응조에서의 탈질과 메탄화 = Simultaneous denitrification and methanogenesis in a single-stage hybrid type UBF reactor / 김구용.
저자명 김구용 ; Kim, Ku-Yong
발행사항 [대전 : 한국과학기술원, 1999].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8009391

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 99003

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

It was reported that the nitrate in anaerobic sludge reduced to ammonia (ammonification) by nitrate reducing bacteria. But recent researches found that when denitrifiers exist in anaerobic sludge, denitrification could occur and that denitrification and ammonification occurred differently depending upon the substrate in anoxic anaerobic sludge. Volatile fatty acid was favored for denitrification, while the fermentative substrates such as glucose were preferred for ammonification. Since early 90's, the combined process of denitrification and methanogenesis in a single anaerobic reactor has been studied for simultaneous removal of carbon and nitrate. However, the relations between denitrifier, acidogenic bacteria, and methanogenic bacteria were not defined. In this study, hybrid type upflow sludge baffled filter (UBF) reactor was adopted. Sludge bed in the bottom of reactor was intended to remove carbon and nitrate by denitrification and methanogenesis. And floating media in the upper of reactor were intended to capture the floating fine biomass from disintegration of granular sludges and also to remove remaining carbon which was not removed due to the inhibition of nitrogen oxide on methane producing bacteria. To investigate the effect of different substrate on denitrification and ammonification, acetate and glucose as substrates were used. It was attempted to remove nitrate and carbon in a single-stage hybrid type reactor. All the reactors removed over 96% of COD and most of nitrate. Nitrate in anaerobic sludge was converted to nitrogen gas(denitrification) or ammonia(ammonification) according to the environmental conditions. When acetate was used as a substrate, COD removal efficiency was very easily changed by the change of volumetric loading rates. And nitrate was removed by ammonification and denitrification according to pH. When influent pH was about 4.7, most nitrate was changed to ammonia and when influent pH was about 7.0, most nitrate was denitrified independent to COD/Nitrate-N ratio. 4000 mgCOD/L and 266 mgNitrate-N/L was removed over 94 and 99% in 24 hours of hydraulic retention time. Most granule had gray color and some had black and in gray-colored granule, black inner side was covered with gray substance and SEM illustrated sarcina type microorganisms which were compact spherical shape. When glucose was used as a substrate, that reactor showed stable COD removal efficiency due to diversity of microorganisms. And in nitrate conversion, influent alkalinity played important role in the ratio of denitrification and ammonification of nitrate. When influent alkalinity was 600 mg$CaCO_3$/L, most nitrate was converged to ammonia but when influent alkalinity was proper, high denitrification ratio was obtained. As COD/Nitrate-N ratio was reduced, denitrification was dominant. Especially, below COD/Nitrate-N=10, most nitrate was denitrified. 4000 mgCOD/L and 700 mgNitrate-N/L was removed over 95 and 99% in 24 hours of hydraulic retention time. There were 3 type in granule according to surface color of granule - gray, yellowish gray, and black. In gray and yellowish gray-colored granules, black inner side was covered with gray and yellowish gray substances and SEM illustrated rod-type type microorganisms which were composed of rod-shaped bacteria resembling Methanothrix.sp.. Till this study, nitrate removal in anaerobic sludge was thought to have problems due to ammonification, but this study showed that most nitrate could be converged to nitrogen gas by adjusting of influent alkalinity and COD/Nitrate-N ratios. Therefore carbon and nitrate removal were carried out in a single stage UBF reactor

서지기타정보

서지기타정보
청구기호 {MCE 99003
형태사항 vii, [53] p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ku-Yong Kim
지도교수의 한글표기 : 신항식
지도교수의 영문표기 : Hang-Sik Shin
학위논문 학위논문(석사) - 한국과학기술원 : 토목공학과,
서지주기 참고문헌 수록
QR CODE qr code