中文摘要：

通过调整混合液回流比和污泥回流比，考察了生物絮凝-A2O组合工艺的去除特性。结果显示：组合工艺对CODcr和NH3-N的去除率受混合液回流比和污泥回流比的影响较小。TN的去除率随混合液回流比的增加先增加后减少，随污泥回流比的增加而增加。磷酸盐的去除率随混合液回流比的增加而增加，随污泥回流比的增加而减少。综合考虑组合工艺对CODcrNH3-N、TN和磷酸盐的去除率，混合液回流比取300％和污泥回流比取80％较合适。在最佳条件下，组合工艺对CODer、NH3-N、TN和磷酸盐的去除率分别达到88．64％、97．56％、70．25％和84．97％。

英文摘要：

By adjusting the reflux ratios of mixed liquor and sludge, the effect of the biological floccula-tion-A20 combined process on pollutants removal were studied. The results showed that, the removal performanceof the combined process on CODcr and NH3-N were slightly influenced by the reflux ratios of mixed liquor andsludge. The removal rate of TN increased at first and then decreased with the increasing reflux ratio of the mixedliquor, and it also increased with the increasing reflux ratio of the sludge. The removal rate of phosphate in-creased with the increasing reflux ratio of the mixed liquor and decreased with the increasing reflux ratio of thesludge. Through a comprehensive consideration, the proper reflux ratios of mixed liquor and sludge were deter-mined to be 300% and 80% respectively. Under the optimal condition, the removal rates of CODcr, NH3-N, TNand phosphate by the combined process reached 88.64%, 97.56%, 70.25% and 84.97% respectively.