强化混凝-吸附预处理生活污水

采用混凝/吸附复配的方式对生活污水进行了浓缩预处理。通过对有机物去除率和混合絮体沉降性能的考察,优选出最佳混凝剂聚合氯化铝和最佳吸附剂粉末活性炭,其最优投加量分别为60 mg/L和40 mg/L。在此复配条件下,COD去除率由单独投加混凝剂时的62%提高到73%,浊度去除率由88%提高到93%。同时利用分子量分级实验进一步阐述了混凝/吸附复配过程提升污水浓缩效果的机制。在机械加速澄清池连续实验中,在原水COD 300~500 mg/L、浊度130~360 NTU的水质条件下,出水COD稳定在70~86 mg/L之间,去除率达80%以上,出水浊度稳定在10 NTU以下。

Pretreatment of sewage by hybrid coagulation-adsorption process

The performance of hybrid coagulation-adsorption process on sewage pre-concentration was investigated. Among three kinds of coagulants and two kinds of adsorbents chosen for this study, poly-aluminum chloride(PAC) and powdered activated carbon, as the optimal coagulant and adsorbent, showed best performance in organic matter removal and mixed floc settleability. With the optimum PAC concentration of 60 mg/L and the optimum powdered activated carbon concentration of 40 mg/L, the COD removal rate rose from 62% to 73%, along with the turbidity from 88% to 93%. Through the COD fractionation test, the specific function of coagulation and adsorption was also explained respectively. After the continuous experiment in mechanically accelerated clarifiers, it could be found that the COD removal rate stayed stably above 80% with the COD concentration of effluent around 70~86 mg/L, with the influent COD of 300~500 mg/L and turbidty of 130~360 NTU. The turbidity was less than 10 NTU during the whole testing period.