An optimization in the design of vermifilter for synchronous municipal sewage-sludge stabilization
The sewage purification and simultaneous sludge stabilization effect of both filter beds of a double-layer filter were compared to optimize the design of vermifilter and improve the economics of vermifilter systems. The upper filter bed exhibited much higher COD and NH4 +-N removal efficiency than the lower bed (43.28-62.86％, 14.31-40.38％ for the upper and 1.70-17.77％, 2.34-12.40％ for the lower). The average of TP removal rate of upper bed was 17.66％, and a markedly reduction was observed in SS in the upper bed (50.38％), whereas there was slight removal effect of TP and SS in the lower bed. VSS/SS for effluent from the upper filter bed (34.52-56.01％) was apparently lower than influent (57.71-70.00％). Moreover, for excess sludge, the upper bed significantly contributed to the nitrogen and phosphorus availability improvement, organics stabilization, organic nitrogen and phosphorus form transformation for better uptake by plant. The arrangement of the lower filter bed has little significance for sewage purification and stabilization, and after the lower bed treatment, slight increase of SS and VSS/SS even could be observed, thus, in view of economical respect, the design of vermifilter could be simplified by doing away with the lower filter bed.
vermifilter optimization sewage sludge stabilization
Zhibo Lu Limin Zhao Jian Yang Meiyan Xing
State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai 200092,China
国际会议
北京
英文
1-5
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）