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박철휘,신창민 대한상하수도학회 2002 상하수도학회지 Vol.16 No.3
In these days, the most of food waste is being landfilled, which give rise to the secondary environmental problems such as lechate and odor. The problem of BNR process for the domestic sewage are the deficit of carbon source compared with N, P so it is hard to get biologically effective N, P removal in sewage treatment plant. Therefore, the objective of this study was to investigate characteristics of BNR process using food waste fermenter. Experiments in a continuois pilot plant have been carried out to demonstrate the feasibility of using the food waste fermentation as an easily biodegradable carbon source for nitrogen and phosphorous removal. BOD/T-N and BOD/T-P ratio of food waste fermentation were 17.5 and 126.9 respectively, which is very high to compare with domestic sewage, therefore fermentation products of food waste was suitable for the external carbon source in BNR proces and the addition load introduced by use of the fermentation products of food waste can be considered negligible. The removal efficiencies of T-P and T-N with fermenter were about 90% and 60%, respectively.
박철휘,정태학 ( Chul Hwi Park,Tai Hak Chung ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.3
Operational characteristics of the UASB Process were studied using a l㎥ pilot plant treating wastewater from a starch manufacturing industry. The reactor was operated with a HRT of 8 hours and the temperature was maintained at 35, 30, 25, and 20℃ for a significant period. COD loading rate varied from 7 to 14㎏/㎥-day as a result of fluctuating influent COD concentration. Both COD removal and the gas production decreased gradually as the temperature decreased. However, reduction of the treatment efficiency at low temperatures was not severe at all. Gas production decreased from 0.256㎥ per ㎏ COD removed to 0.191 as the temperature droped from 35℃ to 20℃. VS reduction efficiency also decreased gradually as the temperature decreased. Although slight increase of the volatile fatty acid was observed at low temperatures, stability of operation based upon pH, alkalinity and volatile fatty acid was maintained at all temperatures. It is believed that stable operation at low temperatures is possible due mainly to accumulation of active sludge granules in the reactor. The sludge granules, 0.7 to 1.2㎜ in size, were mostly composed of rod shaped and filamentous microorganisms with a number of pores.
박철휘,양경수,배윤선 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
The purpose of this study is to investigate the quantity of discharged sewage unit loading factor and the quality of various pollutants in domestic (detached house and apartment) and commercial site. Measurement were worked at Bucheon and Seogwipo city. One was selected because it was a developed lately community, the other was chosen because it was constructed for long period from 1973 to 1992. The sewage was sampled every two hours a day for a week per each season. Data for the quantity of used water, the number of population and areas were also investigated. The result of the study were as follows; (1) The average unit water use flowrate were 215.7l pcd for detached house, 200.6l pcd for apartment, 8.9l/㎡/d for commercial site in Bucheon city, and 212.5l pcd for detached house, 187.7l pcd for apartment, 9.7l/㎡/d for commercial site in Seogwipo city. (2) The average unit discharged sewage flowrate were 179.7l pcd for detached house, 187.4l pcd for apartment, 8.1l/㎡/d for commercial site in Bucheon city, and 159.4l pcd for detached house, 153.1l pcd for apartment, 5.6l/㎡ /d for commercial site in Seogwipo city. (3) The conversion ratio from water to sewage were 83.4% for detached house, 93.4% for apartment, 91.8% for commercial site in Bucheon city, and 75.0% for detached house, 82.2% for apartment, 57.5% for commercial site in Seogwipo city. (4) The average unitloading factor of pollutant were COD_cr 44.4 gpcd, BOD_5 23.3 gpcd, SS 14.3 gpcd, T-N 6.7 gpcd, T-P 0.8 gpcd for detached house, COD_cr 62.1 gpcd, BOD_5 29.5 gpcd, SS 21.4 gpcd, T-N 7.0 gpcd, T-P 0.8 gpcd for apartment. (5) The maximum sewage generation based on factors (water supply, running rate, valid water rate and etc.) could be predicted and compared with survey data.