SBR-电催化组合工艺处理己内酰胺废水试验研究

Treatment of organic pollutants in caprolactam wastewater by SBR and electrocatalytic oxidation combined process

通过小试试验研究芬顿法、序批式活性污泥(SBR)生化法和电催化氧化法对己内酰胺废水中有机物的去除效果;采用SBR-电催化组合工艺现场中试,研究其对己内酰胺废水中有机物的去除效果,分析其运行的稳定性与经济性。结果表明:芬顿法在氧化剂投加量为3.0%时,COD Cr 去除率可达90.0%,但氧化剂成本较高;SBR生化法在适宜能耗时对COD Cr 的去除率为56.1%,单一工艺难以达到处理要求;电催化氧化法在适宜能耗时对COD Cr 的去除率为43.5%,单一工艺难以达到处理要求且单位耗电量较大;SBR-电催化氧化组合工艺对COD Cr 的去除率超过90.0%,出水COD Cr 降至200~300 mg L,废水处理成本降低至5.15元 m^3,技术与经济方面均可行。

The removal effect of organic compounds from caprolactam wastewater by Fenton process, SBR and electrocatalytic oxidation was studied, and the pilot of SBR plus electrocatalytic oxidation processes was set up to study the removal efficiency of organic compounds from caprolactam wastewater, the effect stability and the economy. The results showed that the COD Cr removal rate by oxidant in Fenton process was 90.0% with the oxidant dosage of 3.0%, but the cost of oxidant was high. The removal rate of COD Cr by SBR was 56.1%, and the single process was difficult to meet the processing requirements. The removal rate of COD Cr by electrocatalytic oxidation was 43.5% at appropriate energy consumption, the single process was difficult to meet the processing requirements and the unit power consumption was high. The removal rate of COD Cr by SBR plus electrocatalytic oxidation combined process was above 90.0% and the effluent COD Cr was reduced to 200-300 mg L, with the treatment cost of 5.15 yuan m^3, indicating both technically and economically feasible.