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신항식,전항배,박흥석 대한상하수도학회 1988 상하수도학회지 Vol.2 No.1
Recently, the need for the removal of phosphorus and nitrogen increased due to several reasons including eutrophication control. Biological process could be a reliable and economical method of N and P removal from wastewater, however its removal mechanism and operating criteria were not well established. Objectives of this research are to find out the optimized operating strategy for simultaneous removal of N/P, and their removal mechanisms in SBR. Biological process of phosphours removal from wastewater depends on the mechanism of phosphorus release during anaerobic period followed by phosphorus uptake in aerobic period. SPR(Specific Phosphours release Rate) was useful in estimating the phosphours removal capacity of microbial mass. In this experiment, the removal efficiency of phosphours was above 95% where SPR was above 0.003hr^-1. Phosphorus removal efficiency was progressively enhanced over 4 months. Also the removal efficiencies of both TOC and nitrogen were 95% with the optimized operating strategy; 2-hour anaerobic fill, 3-hour aerobic, 3-hour anoxic, and settle/draw/idle time of 4 hours in SBR.
Hybrid type 반응조에서의 혐기성 슬러지의 탈질(1) : 초산물 기질로 사용한 경우 Acetate as Substrate
신항식,이채영,김구용 대한상하수도학회 1999 상하수도학회지 Vol.13 No.4
In this study, it was attempted to remove nitrate and carbon in a single-stage reac-tor using acetate as substrate. Hybrid type upflow sludge baffled filter reactor was adopted using anaerobic sludge. Sludge bed in the bottom of reactor was intended to remove carbon and nitrate by denitrafication and methanogenesis. Asd floating media in the upper part of reactor were intended to remove remaining carbon which was not removed due to the inhibition of nitrogen oxide on methane producing bacte-ria. The reactor removed over 96% of COD and most of nitrate with volumetric loading rate of 4.0 kgCOD/㎥ ㆍday, hydraulic retention time of 24hr, 4.000mgCOD/L,and 266 mgNO3-N/L. Nitrate in anaerobic sludge was converted to nitrogen gas(denitrifi-cation) or ammonia (ammonification) according to pH of influent. COD removal effi-ciency was easily affected by the change of volumetric loading rates and nitrate con-centration. And when influent pH was about 4.7, most nitrate changed to ammonia while when influent pH was about 6.8~7.0, most nitrate denitrified independent of COD/NO3-N ratio. Most granules were gray and a few were black. In gray-colored granule, black inner side was cowered with gray substance and SEM illustrated Methanoccoci type microorganisms which were compact spherical shape. Anaerobic filter removed residual COD effectively which was left in sludge bed due to the inhi-bition of nitrogen oxide