化学预处理与生化组合处理兰炭生产污水

通过现场中试实验对曝气微电解、强化混凝、催化电氧化作预处理提高兰炭污水的可生化性进行了探讨.并对通过预处理与生化处理的组合实现兰炭污水达到污水排放标准的可行性进行了研究.结果表明,原水首先调节pH值为3左右,在通过120min的曝气微电解处理后,可使有机物由25000mg/L下降到10000mg/L,氨氮由3000mg/L降到1200mg/L,COD和NH3-N的去除均可达到60%;然后调节曝气微电解出水的pH值为8~9,通过投加200mg/L PAC、4.5mg/L PAM强化混凝后,出水COD和NH3-N可去除50%;强化混凝后出水再通过120 min的催化电氧化反应器的高级氧化处理,废水中COD去除率可达65%,NH3-N去除率为60%;催化电氧化反应器出水最后通过厌氧/好氧生物接触处理,其出水COD<150mg/L,NH3-N<25 mg/L.

Advanced treatment of the semi-coking wastewater by the combination of chemical pretreatment and biochemical treatment

Biodegradation of the semi-coking wastewater was improved by the combination of pretreatment technologies of the aeration ferric-carbon micro-electrolysis, the enhanced flocculation, and the catalyzed electro-oxidation through on-site pilot test. The feasibility of ensuring semi-coking wastewater to achieve wastewater discharge standards was studied through a combination of chemical pretreatment and biological treatment. The results show that COD was from 25000mg/L down to 10000mg/L, NH3-N was from 3000mg/L down to 1200mg/L, and the COD and NH3-N all reached 60% through the treatment of aeration ferric-carbon micro-electrolysis of 120 min with the adjustment pH value of about 3 of the raw water. Then, after adjustment of pH value to 8~9 for effluent of the aeration ferric-carbon micro-electrolysis, the removal rates of COD and NH3-N of the effluent of the enhanced coagulation all reached about 50% by dosing 200 mg/L of PAM and 4.5mg/L of PAM. Next, the effluent by the treatment of advanced oxidation reactor of catalyzed electro-oxidation of 120 min attained COD removal rate of up to 65% and NH3-N removal rate of 60%. Finally, the effluent by the treatment of biological contact oxidation of the anaerobic/aerobic reached COD<150mg/L and NH3-N<25mg/L. The results provide a theoretical basis for the treatment technology of the semi-coking wastewater.