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최홍복,황경엽,신응배 ( Hong Bok Choi,Kyung Yub Hwang,Eung Bai Shin ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.4
The effect of sludge pretreatment on the anaerobic digestion of waste-activated sludge(WAS) was studied. In this sludge pretreatment process, bacteria in the WAS were ruptured by mechanical jet and smash under pressurized conditions. The protein concentrations in the WAS varied significantly before and after pretreatment. Protein concentration increased according to jet times and pressure. Efficiencies of volatile solids(VS) removal were 40∼45% when the pretreated WAS once under pressure of 30 bar was fed into an anaerobic digester with 4-day hydraulic retention time(input organic loading, 2. 95 ㎏ VS/㎥.d). When intact WAS was fed into the digester, WAS was not digested efficiently even with a longer hydraulic retention time(10 days). Therefore, it is recognized that higher digestion efficiencies and stabilization of the WAS were obtained through a mechanical pretreatment of WAS.
최홍복,신응배,황경엽 漢陽大學校 環境科學硏究所 1996 環境科學論文集 Vol.17 No.-
본 연구는 2차 슬러지의 전처리가 혐기성 소화에 미치는 영향에 관한 연구로 슬러지를 기계적으로 분사 및 충돌시키는 전처리공법에 대한 연구이다. 본 전처리공법의 핵심은 슬러지를 구성하고 있는 미생물 세포를 파괴하는 것으로 이를 위하여 슬러지를 기계적으로 가압하에 분사, 충돌시킨 물리적 힘으로 세포막을 파손시켜 내부 단백질을 노출시켰다. 실험결과 충돌 전후 시료의 단백질 농도 변화가 뚜렷이 나타났다. 단백질 농도는 분사압력이 증가 할 수록 또한 분사횟수가 증가할 수록 높아졌다. 전처리한 슬러지를 회분식 혐기성소화 실험한 결과 체류시간 2∼26일에서 13∼50%의 VS제거효율을 나타냈다. 반면에 같은 운전조건에서 전처리하지 않았을 경우 2∼35%의 VS제거효율을 나타내서 하수의 2차슬러지를 기계적으로 전처리 할 경우에 월등히 높은 혐기성 처리효율을 보이고 있는 것으로 나타났다. This research investigates the effectiveness of sludge pretreatment as it affects the subsequent anaerobic digestion of waste-activated sludge(WAS). The key of this pretreatment process is that bacteria cells in the WAS are ruptured by mechanical jet and smash under pressurized conditions. The protein concentrations in the sludge vary significantly before and after pretreatment. Protein concentration increases according to pressure and smash times. In batch experiments, the removal efficiencies of volatile solids (VS) were 13∼50% when the WAS is pretreated once under 30 bar fed into an anaerobic digester with 2∼26day retention time. Under the same operating conditions, when intact WAS is fed into the digester, VS removal efficiencies are 2∼35%. It is observed that higher digestion efficiencies of sludge can be obtained through mechanical pretreatment of sludge.