芬顿试剂预处理杀螟丹农药废水

Pretreatment of cartap pesticide wastewater by Fenton reagent

利用芬顿试剂(Fenton)氧化预处理杀螟丹农药废水,分别考察了H2O2与Fe SO4·7H2O投加量、初始p H、反应时间、温度和摇床转速对Fenton试剂处理杀螟丹废水的影响。结果表明,杀螟丹废水初始COD为676.8 mg/L时,取废水样100 m L,优化反应条件为Fenton试剂的用量1 g Fe SO4·7H2O+4 m L H2O2,初始p H值为3,搅拌强度为160 r/min的摇床转速,反应温度25℃,反应时间60 min。在优化反应条件下COD的去除率达到83.9%。通过Fenton降解,废水可生化性BOD5/COD从0.0745~0.0747上升至0.9066~0.9228,可生化性大幅提高,为后续生化处理创造了条件。考虑到运用于工业废水处理中经济成本等实际问题,建议选取Fenton试剂的用量0.5 g Fe SO4·7H2O+1 m L H2O2,COD去除效率能达到65.5%。

The degradation of Cartap pesticide wastewater by Fenton's reagent was investigated. The experiment was carried out to study the effects of the dosage of FeSO4·7H2O and H2O2,initial p H,reaction temperature,the reaction time and bed rotation speed on the degradation of the Cartap pesticide wastewater,respectively. The Cartap pesticide wastewater has a chemical oxygen demand( COD) concentration of 676. 8 mg / L in a sample of 100 m L. The optimum conditions of degradation in Fenton's reagent system were determined to be 1 g Fe SO4·7H2O + 4 m L H2O2,p H of 3,bed rotation speed of 160 r/min,and reacing for 60 min at 25℃. Under these conditions,the COD removal efficiency of Fenton's reagent pretreatment was 83. 9%. The biodegradable BOD5/ COD value of the Cartap pesticide wastewater increased from 0. 0745 ~ 0. 0747 to 0. 9066 ~ 0. 9228 after the solution was treated by Fenton's reagent,it was advantageous to subsequent biodegradation processing. Considering the treatment costs,it is recommended that it would be advantageous to use a dosage of 0. 5 g Fe SO4·7H2O + 1 m L H2O2. Under these conditions,the removal of COD could reach 65. 5%.