物化-厌氧-好氧工艺处理精细化工废水实验与工程应用

THE EXPERIMENT AND ENGINEERING APPLICATION OF FINE CHEMICAL WASTEWATER TREATMENT WITH PHYSIOCHEMICAL- ANAEROBIC- AEROBIC PROCESS

针对江苏某化工厂原有废水处理系统存在的问题,采用"物化-厌氧-好氧"工艺进行精细化工废水处理中试,并对该系统进行改造。第1次中试结果表明,在原有废水处理工艺的基础上增加预处理设施与2#厌氧池、生化系统HRT约为3.20d时,进水COD提高至4500mg/L时,系统COD去除率为97.33%;第2次中试结果表明,在第1次中试基础上新增加电化学装置、2#好氧池、2#混凝沉淀池,生化系统HRT约为4.74 d时,进水COD提高至7383mg/L,系统COD去除率为96.66%。工程改造结果表明,增加混凝气浮装置、局部调整原有废水处理工艺结构,生化系统HRT由8.05 d减少到5.95 d左右;进水质量流量为80t/d、COD为5 626mg/L时,COD去除率为97.85%,出水能达标排放,符合设计要求。

To solve the problems remained in the existing wastewater treatment system of a chemical plant in Jiangsu province, the physicochemical- anaerobic-aerobic process was used for an experiment of fine chemical wastewater treatment and the transformation of the system. The first pilot results showed that, on the base of the original wastewater treatment process, when the pretreatment facilities and anaerobic tank 2^# were added and the system HRT was about 3.20 d, the COD increased to 4 500 mg/L and the removal ratio of COD was 97.33%. The second pilot results showed that, on the base of the first pilot, when electrochemical device, aerobic tank 2^# and coagulation-sedimentation 2^# were added, and the system HRT was 4.74 d, the influent COD increased to 7 383 mg/L and the COD removal of system was 96.66%. Engineering application results showed that, under the guidance of the pilot results, the HRT of system decreased from 8.05 d to 5.95 d by increasing coagulation-flotation device and adjusting partial of original wastewater treatment process structure. When wastewater with COD of 5 626 mg/L flowed in under a rate of 80 t/d and, the removal rate of COD reached 97.85%, and the effluent met both the designing requirements and discharge standards.