| Title |
Enhancement of Anaerobic Digestion of Sewage Sludge by Pretreatment |
| Authors |
최홍복 ; 황경엽 ; 신응배 ( Hong Bok Choi ; Kyung Yub Hwang ; Eung Bai Shin ) |
| Abstract |
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. |