UV/Fe^(3+)/H_2O_2催化-混凝联合工艺处理络合铜镍废水

TREATMENT OF COMPLEXING COPPER AND NICKEL WASTEWATER BY UV/Fe^(3+)/H_2O_2 OXIDATION-COAGULATION PROCESS

采用UV/Fe3+/H2O2催化-混凝联合工艺对难处理络合铜镍电镀废水进行了研究,考察了Fe3+和H2O2初始浓度、初始pH值、温度、反应时间及混凝液pH、混凝剂质量浓度对处理过程的影响,探讨了废水的降解途径和机理。结果表明:在体系初始pH=3,温度50℃,H2O2和Fe3+初始浓度分别为1.5×10-4mol/L、2.5×10-5mol/L,反应时间60min,混凝液pH=8及混凝剂质量浓度为500mg/L的条件下,废水的COD去除率为96.98%,Cu2+为99.91%,Ni2+为99.92%,处理水达到国家一级排放要求。同时依据GC/MS对X-GN降解最终产物的分析结果,推导出废水的基本降解机理和途径。

Treatment of refractory complexing copper and nickel wastewater was carried out by UV/Fe3＋/H2O2 oxidation-coagulation process. The effects of initial pH, initial H2O2 and Fe^3＋ concentration, reaction time, temperature, pH and mass concentration on coagulation were investigated. The optimistic conditions were determined, Under the conditions of initial pH=3 and temperature 50℃, initial concentration of H2O2 and Fe^3＋ with 1.5×10^-5mol/L and 2.5×10^-5nol/L respectively, reaction time 60min, coagulating liquor pH=8 and the mass concentration of coagulant with 8 and 500mg/L, the removal rate of COD, copper and nickel reached to 96.98% ,99.91% and 99.2% respectively; the treated water reached the first-grade national discharge standard. Possible mechanism and pathway of the reaction was proposed on the basis of experimental results.