Leachate treatment using a demonstration aged refuse biofilter
Hongjiang Li , Yingying Gu , Youcai Zhao , Zhiping Wen
DOI:
Received August 06, 2009,Revised March 17, 2010, Accepted , Available online
Volume 22,2010,Pages 1116-1122
- Summary
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Approximately 7000 m3 of aged refuse (AR) with a placement of over eight years was excavated from Shanghai Refuse Landfill, the
largest landfill in China, and used for the construction of a two-stage bioreactor (AR biofilter) media for the biological treatment of 100
m3 of refuse landfill leachate. It was found that over 64% of COD, 96.9%–99.8% of NH4
+-N, and 95.8%–99.8% of BOD5 could be
removed by the AR biofilter, when the leachate with initial COD, BOD5, and NH4
+-N concentrations were 986–4128 mg/L, 264–959
mg/L, and 538–1583 mg/L, respectively. The corresponding concentrations in the e uent were reduced to below 300–400 mg/L, 2–12
mg/L, and 10–20 mg/L, respectively. The e uent was clear and pale yellow with suspended solid below 150 mg/L and color below
150 Pt/Co degree. Meanwhile, the total nitrogen removal was only 49%–63%, indicating a relative poor denitrification capacity of AR
biofilter. The e uent pH was neutral and the population of Escherichia coli was less than 10??1 CFU/mL. Hence, it was considered that
the demonstration project can work well for the e ective treatment of leachate.
