SBR-絮凝法在养牛场废水处理中的应用

采用SBR-絮凝工艺对养牛场废水进行处理。研究了曝气时间、沉淀时间、污泥浓度等因素对SBR处理效果的影响；确定了絮凝处理阶段最佳絮凝剂用量。结果表明：在SBR阶段，曝气时间为6h，沉淀时间为60min，污泥浓度为2500mg／L左右时，COD去除率达80％以上；进水COD在500～2500mg／L之间变化时，SBR系统运行稳定；以质量浓度为3％的聚合AlCl3作为絮凝剂进行絮凝，出水COD、色度大幅降低，最终出水达排放标准。

TREATMENT OF CATTLE FARM WASTEWATER WITH SBR- COAGULATION PROCESS

A process of SBR-flocculation was adopted to treat the cattle farm wastewater. Effect of aeration time, sedimentation time and the MLSS concentration on the SBR reactor were investigated; and the kind of coagulants, the dosage and the effect of the coagulant were determined too. The results showed that the COD removal rate was 80% when the SBR reactor was operated under the conditions of aeration time 6h, sedimentation time 60min and MLSS concentration 2500mg/L and, that there was no obvious effect on the SBR reactor when the COD concentration ranged from 500mg/L to 3000mg/L. In order to remove the COD in the effluent of SBR and lower the colourity furthermore, the coagulation sedimentation method was applied to the process of SBR. The results were satisfactory when poly aluminium chloride was used as the coagulant, both the concentration of COD and the colourity of the effluent lowered obviously. The effluent meeting the national discharge.