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RISS 인기검색어
- 검색키워드
- 저자 : 정태학 ( Chul Hwi Park (검색결과 2 건)
- 무료
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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.
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상향류식 혐기성 입상슬러지 공법의 유기폐수 처리 효율에 미치는 온도의 영향
정태학,박철휘 대한상하수도학회 1996 상하수도학회지 Vol.10 No.4
Effects of temperature on the efficiency of the Upflow Anaerobic Sludge Blanket(UASB) process for treatment of wastewater from a starch and related products manufacturing industry were investigated using laboratory scale reactors equipped with two types of Gas-Solid Separator(GSS). Both fresh digested sludge and granular sludge stored nearly for one year at room temperature were good as a seeding material. The reactors seeded with aged granular sludge showed slow start-up, however, lowered activity at the initial period was recovered gradually. The GSS with an inner cylinder was proved to be effective in liquid-solid separation compared to the conventional type. Although the rate of organic removal and gas production per unit volatile suspended solids in the reactor reduced significantly as the temperature varied from 35 to 20℃, possibility of operation at low temperatures was shown as a result of gradual buildup of volatile suspended solids in the bed. Stable operation with a reduced efficiency was possible at a COD loading of 5-8㎏/㎥/day at a temperature as low as 20℃.
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