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유입부하가 DEPHANOX 및 Modified-DEPHANOX 공정에 미치는 영향
류홍덕,민경국,이상일,Ryu, Hong-Duck,Min, Kyung-Kook,Lee, Sang-Ill 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
This study was initiated to evaluate the efficiencies of DEPHANOX and Modified-DEPHANOX, which were devoloped to enhance nitrogen removal efficiency in municipal wastewater treatment. In the results, removal efficiency of organic matters was not affected much by increased loading rate of organic matters which is contained in influent. The nitrogen removal efficiencies according to the loading rate of influent TN was decreased drastically in conditions of over $0.2kg/m^3{\cdot}day$, which is T-N loading rate, and the DEPHANOX process was affected more sensitively than the M-DEPHANOX was. When the temperature was altered from $25^{\circ}C$ to $16^{\circ}C$ at HRT 6hrs, the removal efficiency of ammonia nitrogen was still over 90% and it was concluded that both DEPHANOX and M-DEPHANOX were strong enough to endure temperature variation. Moreover, both processes showed over 90% in ammonia removal efficiencies in over HRT 5hrs, so it was concluded that they were strong in HRT variation. M-DEPHANOX process showed a higher value than DEPHANOX did in T-N removal efficiency to the extent of 4~21 %, which resulted from differency of denitrification rates and the biosorption efficiency of organic matter in both processes. In the condition of HRT less than 4hrs, concentrations of ammonia nitrogen contained in effluents and nitrification reactors, might be sensitively affected by biosorption efficiency of organic matters in first separation tank. In the effect of effluent nitrate concentration in phosphorus removal, the more effluent nitrate concentration was decreased, the more phosphorus removal efficiency was increased. This result is related to the decrease of concentration of effluent nitrate which resulted from nitrification inhibition by decreased HRT.
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.