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신항식,임경호 ( Hang Sik Shin,Kyeong Ho Lim ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
In this study, organic stabilization and nitrogen removal were investigated using a household-type hollow fiber membrane separation bioreactor of 1.9L volume. The process employed direct solid-liquid separation by the hollow fiber membrane module and an aeration tank. There was a distinct effect of solid content on the membrane flux. The steady water flux decreased as MLSS concentration increased from 3,500 to 13,300㎎/ℓ. The reduction of influent COD aver 95% was obtained in the system without sludge wastage. However, by-products of cell degradation could accumulate and have adverse effect in the biological reactor if sludge was not wasted. SS was completely removed from the effluent so that clean effluent could be obtained by the membrane bioreactor. Enteric bacteric such as E. coli was not detected in the effluent. By the ultrafiltration membrane bioreactor, TKN was removed up to 90% or more by simultaneous nitrification and aerobic denitrification. Endogenous denitrification rate of 0.0139g NO₃-N/g VSS.day was observed.
신항식,임경호,이의신,최계운 ( Hang Sik Shin,Kyeong Ho Lim,Eui Sin Lee,Gye Woon Choi ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
Biofilm system is suitable for the pretreatment of water because biofilm can act as niches where slow-growing degraders can survive at low organic concentrations. In order to cope with stringent environmental standards, it became essential to improve the understanding of the phenomena governing biological degradation of organics. In this study, effects of hydraulic retention time (HRT) and temperature on the efficiency of submerged biofilm reactors were investigated. Removal efficiency total organic carbon (TOC), turbidity, and algae increased with the HRT. It is considered that over 1 hr HRT is needed to ensure the removal of higher than 30% TOC. In comparison to honey comb type media, fibrous media were more favorable to the attachment and growth of active microorganisms. The close relationship with chlorophyll-a concentration and particulate organic carbon (POC) concentration make POC a surrogate parameter for estimating the removal efficiency of algae.
이상민,신항식,임경호 대한상하수도학회 1996 상하수도학회지 Vol.10 No.1
The presence of ammonia, usually in the form of ammonium ion(NH_4^+), can enhance bacterial growth in the distribution system and make the production of drinking water more costly if ammonium must be removed to ensure good disinfection. Removal of ammonia by biological oxidation could be economical which prevents excess chlorine dosage. In this research, effects of hydraulic retention time(HRT) and media type on the ammonia removal efficiencies of submerged biofilm reactor were investigated. The biofilm reactors combined the characteristics of high biological solids capture efficiency and good hydraulic control. The results indicate that biofilms can remove over 77 percent of the ammonia with HRT of longer than 2 hr even at low temperature ranging from 14.6 to 16.6℃. The HRT has a significant effect on nitrification. The overall nitrification and efficiency of ammonia removal increase with increasing HRT. It has also been observed that when the fibrous media was used, the ammonia removal, nitrification rate and endurance to shuck improved.