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발효된 1차 침전슬러지를 공급하여 간헐폭기조를 이용한 도시하수의 영양염류 처리
원성연,이상일,Weon, Seung-Yeon,Lee, Sang-Ill 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
In this research, a 2-stage intermittently aerated activated sludge system(IA) and intermittently aerated dynamic flow activated sludge system(DF) were investigated for the removal of nutrients in domestic wastewater. Wastewater was characterized by low C/N( organics/nitrogen) ratio. $COD_{cr}$, $BOD_s$, TKN and TP concentrations of domestic wastewater were 235, 47, 32 and 5.4 mg/L, respectively. Three sets of IA and one set of DF were operated. Three of four systems were added with fermented settled sludge taken from primary settling tank as an external electron donor and the other(IA) for control reactor was operated without addition of electron donor. All systems were operated at same sludge retention time of 20 days and hydraulic retention time of 12hrs. The supplemental electron donor was supplied into the anoxic mode. A higher denitrification rate was observed from the reactors with fermented settled sludge as an electron donor for denitrification compared to that of without addition of organic source. The result of this study indicates that the settled primary sludge, if the fermented at the acid stage, was an excellent electron donor for denitrification. 81 % of TN and 80% of TP were removed from the systems with the supplemental organic source added. However, the control reactor without addition of electron donor showed only 39% of TN and 43% of TP.
침전 슬러지와 가축분의 유기산화 및 발효유기산이 탈질반응에 미치는 영향
원성연 ( Seung Yeon Weon ),박승국 ( Seung Kook Park ),민경국 ( Kyung Kook Min ),정근욱 ( Keun Yook Chung ),전병희 ( Byong Hee Jun ),이상일 ( Sang Ill Lee ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.2
Fermentation efficiencies of organic wastes from the variety of sources were evaluated based on the production of total volatile acids(TVA) in batch reactor. Mixing and pH were not significant factors in producing TVA from the organic wastes. After a 10-day fermentation, final TVA concentrations in piggery, cattle, poultry, and primary settled sludge of domestic wastewater were 8,900, 2,900, 7,370 and 1,630 ㎎/L, respectively. The pH of organic wastes was decreased from neutral to 5.7. The ratio of TVA to NH₄^+-N produced from the animal waste ranged from 11.5 to 30.1, whereas, that in the primary settled sludge of domestic wastewater, was 5.4. Possibility of fermented organic wastes as the electron donors for denitrification in the activated sludge was investigated. In both acclimated and nonacclimated activated sludge, higher denitrification rates were obtained with fermented piggery sludge added than with either methanol or acetate added. The fermented organic acids derived from the primary settled sludge gave the higher denitrification rate (4.2 ㎎ NO₃-N/g vss·hr) in the acclimated activated sludge. Denitrification rate was 1.5 ㎎ NO₃-N/gvss·hr in the nonacclimated sludge with the fermented acids from the primary settled sludge of domestic wastewater added.
DynaFlow 공정을 이용한 양돈폐수의 유기물 질소 인 동시처리
박승국(Seung Kook Park),김병군(Byong Goon Kim),원성연(Seung Yeon Weon),이상일(Sang Ill Lee) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.1
2 stage IAAS (intermittently aerated activated sludge) and DynaFlow (dynamic flow intermittently aerated activated sludge) systems without anaerobic reactor were applied to treat swine wastewater of high strength of organic and nitrogen contents. COD_(cr), TKN and total phosphorus concentration in influent were averaged to 4, 300㎎/L, 650㎎-N/L and 68㎎-P/L, respectively. Removal efficiency of total nitrogen was obtained to over 92%. However, as increase of nitrogen loading to over 0.6㎏-N/㎥ ·day, nitrogen removal efficiency was dropped to 80%. NO₂-N and NO₃-N concentration were increased up to 55㎎/L and 30㎎/L, respectively. The increase of NO_x-N concentration can be attributed to low C/N ratio and toxic effect of free ammonia to Nitrobacter sp.. Sludge rising problem in clarifier was observed as increase of influent TKN of over 600㎎/L. The significant difference in nitrogen removals between 2 stage-IAAS and DynaFlows was observed in starting period. Adaptation period for DynaFlows was only 2 days, whereas that of 2 stage-IAAS was 20 days. This means that DynaFlow was better process to treat nitrogen in fluctuating strength of pollutants. From the experimental results, both 2 stage-IAAS and DynaFlow processes are supposed to feasible processes to treat nutrients in high strength wastewater, such as, poultry and swine wastewater.