以稻秆为固体碳源处理分散养猪冲洗水的试验研究

Research on treating dispersed piggery rinse water using rice straw as solid carbon source

针对分散养猪废水经厌氧和人工湿地处理后存在C/N低的问题,以廉价的稻秆作为固体碳源和生物膜载体,研究反应器启动阶段运行性能、水力负荷的影响以及污染物沿程去除特性.结果表明NO3--N主要在反应器上部稻秆填充层被去除,去除率超过95%,且无明显NO2--N积累,反硝化速率为0.052mg/(g·h).稻秆本身会浸出释放有机物和氮(主要为NH4+-N),导致运行前期出水COD和NH4+-N高于进水,但仍远低于《畜禽养殖业污染物排放标准》(GB18596-2001)的排放限值,40d后COD逐步降至40mg/L左右.COD和NO3--N可在反应器下部的砖渣填充层被进一步去除.

Against the low C/N ration in dispersed piggery wastewater after the treatment of anaerobic and constructed wetland, using low-cost rice straw as solid carbon source and biofilm carrier to study the performance in start-up stage, the effect of hydraulic loading and pollutants removal profile along the height of the reactor were investigated. The results showed that the NO3 -N was removed mainly in the top layer of the reactor, which filled with rice straw. The removal rate of NO3 -N was over 95% and the denitrification rate was 0.052mg/（g·h）, the effluent without obvious accumulation of NO2 -N, simultaneously. In addition, the COD and NH4＋-N of effluent was higher than the influent at the early stage owing to the rice straw itself leaching organic and nitrogen substance （mainly is NH4＋-N）, but the concentration was still much less than the emission limits of discharge standard of pollutants for livestock and poultry breeding （GB 18596-2001） COD reduced to about 40mg/L gradually after forty days. COD and NO3 -N carl be further removed by the brick slag fill layers in the bottom reactor.