摘要
利用中试规模的人工湿地对污泥进行了为期4a的生态稳定化处理。系统占地80m^2，填料层厚度为0．6m，超高0．5m，湿地植物选用芦苇。系统前2a为污泥负荷期，后2a自然稳定期。进泥TS、VS、含水率分别为平均22．34g／L 、7．76g／L和97％，污泥负荷平均0．691kg（TS）／m^2·d。在第1a的系统调整期内，渗滤液COD去除率在60％～80％；而第2aCOD去除率低于第1a，为40％～50%；出水COD在100～200mg／L之间。在负荷期内，随着运行时间的延长，也即随着污泥积存厚度的增加，渗滤液透过积泥层的时间变化不定，即渗滤液并非均匀下渗，而是部分渗滤液优先沿阻力最小的植物茎壁、根系以及积存污泥中大的孔隙向下流动。在第3a和第4a的自然稳定期内，污泥脱水较为充分，含水率分别降至平均34．3％和30．5％；污泥有机质含量分别降至平均16．8％和10．24%；稳定化污泥的全氮和全磷含量分别为平均0．98%和0．27％。对比发现，系统内植物量和植物营养成分都比野生植物高。
Pilot scale sewage sludge ecological stabilization system was conducted for sludge dewatering, mineralization and stabilization. The study was performed from 2005 to 2008 on a bed with a total area of 80 me. Influent total solid, volatile solid and water content were averaged 22. 34 g/L, 7. 76 g/L and 97%. Sludge loading rate was averaged 0. 691 kg（TS）/m^2 · d. The first two years were sludge loading period and the other two years were natural stabilization period. The percolate COD removals ranged from 60%-80% in the first year, and from 40%- 50% in the second year, with 100 - 200 mg/L of effluent COD concentration. During the first two years, the percolate did not filtrate downwards evenly. Part of percolate filtrated downwards along stems, roots and cracks existing in dried sludge which had lower flow resistance. During the natural stabilization periods,sludge water contents decreased to 34.3% and 30.5% ,and organic matter contents decreased to 16.8% and 10.24% in the third and forth years, individually. Total nitrogen and total phosphorus contents of stabilized sludge were averaged to 0.98% and 0.27%. It was found that plant biomass and nutrient components in the system were higher than that of native ones.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第4期151-156,共6页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金资助项目(50978048)
关键词
人工湿地
干化
生态稳定化
污泥
constructed wetland
dewatering
ecological stabilization
sewage sludge
