混凝沉淀深度处理混合化工污水二级出水的研究

摘要

The experiment on treatment of secondary effluent of mixed chemical wastewater by coagulation and sedimentation was studied. The results showed that: the best coagulation effect was obtained with the mixed addition of PAC and PAM, the optimal dosage of the two agents were 100 and 1 mg/L respectively, the optimal reaction time was 30 min. Under the above condition, the average mass concentration of CODo and TP of the effluent water reached 68 and 0.35 mg/L respectively, the chroma was 31 degree. The effluent water quality met the specification for grade 1 in DB 32/939-2006 Jiangsu Provincial Discharge Standard of Main Water pollutants for Chemical Industry, the total additional cost for the treatment was 0.33 yuan/m3.%利用混凝沉淀工艺对混合化工污水二级出水进行试验研究,结果表明:采用PAC和PAM混合投加混凝效果最佳,最佳投加量分别为100、1 mg/L,最佳反应时间为30 min.在此工况下,出水CODCr、TP的质量浓度可分别达到68、0.35 mg/L,色度可达31度,满足江苏省DB 32/939-2006《化学工业主要水污染物排放标准》中的一级标准要求,新增总处理成本为0.33元/m3.