Leachate pretreatment for enhancing organic matter conversion in landfill bioreactor.
Direct recycling of leachate from refuse of high food waste content was shown to ineffectively stabilize the refuse. This work aims at evaluating the effects of three pretreatments of leachate on the refuse stabilization efficiency were investigated. Pretreatment of leachate using an anaerobic upflow filtration bioreactor (UFB) or a well-decomposed waste layer could reduce the COD and provide methanogens, both were beneficial to establish early methanogenesis status. Using an aerobic sequential batch reactor (SBR) to pretreat the leachate could reduce its COD to 1000 mg l(-1), but the fully developed methanogenesis phase would be built up in a later stage. The organic matters in the effluent leachate inhibited both the hydrolysis/acidogenesis and the methanogenesis steps in the refuse. With the dilution and acid neutralization effects by the recycled leachate, a favorable methanogenetic environment could be produced from the column's top, which moved downward along, and finally made the breakthrough of the column.
He
Pin-Jing
PJ
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, PR China. solidwaste@mail.tongji.edu.cn
Qu
Xian
X
Shao
Li-Ming
LM
Li
Guo-Jian
GJ
Lee
Duu-Jong
DJ
D000693:Anaerobiosis; D019149:Bioreactors; D005374:Filtration; D009930:Organic Chemicals / Q000737:chemistry*; D012037:Refuse Disposal
D009930:Organic Chemicals