Synchronous municipal sewerage-sludge stabilization.
A study on a pilot plant accomplishing synchronous municipal sewerage-sludge stabilization was conducted at a municipal sewerage treatment plant. Stabilization of sewerage and sludge is achieved in three-step process: anaerobic reactor, roughing filter and a microbial-earthworm-ecofilter. The integrated ecofilter utilizes an artificial ecosystem to degrade and stabilize the sewerage and sludge. When the hydraulic retention time(HRT) of the anaerobic reactor is 6 h, the hydraulic load(HL) of the bio-filter is 16 m3/(m2 x d), the HL of the eco-filter is 5 m3/(m2 x d), the recycle ratio of nitrified liquor is 1.5, the removal efficiency is 83%-89% for COD(Cr), 94%-96% for BOD5, 96%-98% for SS, and 76%-95% for NH3-N. The whole system realizes the zero emission of sludge, and has the characteristics of saving energy consumption and operational costs.
Bukuru
Godefroid
G
School of Environment Science and Engineering, Tongji University, Shanghai 200092, China. gbukuru@caramail.com
Jian
Yang
Y
D000818:Animals; D001419:Bacteria / Q000378:metabolism*; D002681:China; D004777:Environment; D009835:Oligochaeta / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
D012722:Sewage; D010100:Oxygen