常温下ABR处理低浓度废水性能及污泥特性

Treatment of low strength wastewater and sludge characteristics in anaerobic baffled reactor at normal temperatures

研究了常温（17—25℃）下4隔室厌氧折流板反应器（ABR）处理低浓度废水的运行效果及污泥特性。在水力停留时间（HRT）为24h，进水COD浓度为1500、1000和500mg／L左右时，平均COD去除率分别为94％、93％和87％。进水COD浓度保持在500mg／L左右，将HRT降为12h和8h，COD的去除率仍达到83％以上。厌氧污泥性质测定结果表明，最后隔室中的污泥浓度、颗粒化程度及产甲烷活性与其他隔室相比明显较低，说明低浓度进水对最后隔室厌氧污泥的性质影响较大。颗粒污泥扫描电镜观察显示，各隔室颗粒污泥内部微生物组成差异较大，第1隔室颗粒污泥以产甲烷球菌为主，第2隔室颗粒污泥中没有明显的优势菌，但杆状菌比第1隔室明显较多，第3、4隔室颗粒污泥中以索氏甲烷丝菌为优势菌。

The performance and the sludge characteristics of an anaerobic baffled reactor （four compartments） treating low-strength wastewater were investigated at normal temperatures （17 -25℃ ）. With a hydraulic retention time （HRT） of 24 h and influent COD concentrations of 1 500, 1 000 and 500 mg/L, the average COD removal rates were 94% , 93% and 87% , respectively. At a constant influent COD of 500 rag/L, the HRT was reduced to 12 h and 8 h, COD removal rate was more than 83%. The concentration, particle size and specific methanogenic activity of the sludge in the last compartment were significantly lower than in the other compartments. This revealed that the low-strength influent influenced the sludge properties in the last compartment more strongly than in the other compartments. The examinations of scanning electron microscope indicated that the microbial composition of granular sludge were obviously different in four compartments. The granules in compartment 1 were mainly comprised of methanococcus. There were no absolutely predominant bacteria in compartment 2. Methanothrix soehngenii were predominant bacteria of granular sludge in compartment 3 and 4.