高浓度兽用抗菌药生产废水预处理氧化工艺的优化

Optimization of pretreatment oxidation process for high concentration veterinary antimicrobial production wastewater

针对难生物降解的实际高浓度兽药废水,实验考察了Fe/C微电解、O_3氧化、Fe/C+H_2O_2氧化、Fe/C+O_3氧化和Fe/C+H_2O_2+O_3组合氧化工艺对兽药废水的处理效果.实验结果表明:Fe/C最佳反应时间为2h,O3的最佳反应时间为3h,O_3反应前废水最佳pH为9,H_2O_2的最佳投加量为6mL/L.最佳条件下,Fe/C对废水COD的去除率为21.71%,Fe/C+H_2O_2工艺为42.76%,Fe/C+H_2O_2+O3组合工艺为57.24%.优化可知,Fe/C+H_2O_2+O3组合工艺可有效氧化实际兽药废水,废水COD的大幅下降为后续的生物处理奠定了基础.

For real biorefractory veterinary medicine wastewater with high concentration, the oxidative effects of Fe/C micro-electrolysis, 03 oxidation, Fe/C ＋ 03, Fe/C q- H202 and Fe/C q- H2Oz q- O3different processes wereevaluated for the pretreatment of veterinary wastewater. The experimental results demonstrated that the optimumreaction time for Fe/C was 2 h, 3 h of reaction time and pH 9 of initial wastewater were optimized for 03 oxidation,and optimal H202 dosage was 6 mL/L. Under the optimal conditions, the COD removal rates of veterinarywastewater reached 21.71%, 42.76% and 57.24% for Fe/C, Fe/C＋ HzOz and Fe/C＋ H2O2 -＋-03 pro-cessesrespectively. The optimization of the process indicated that Fe/C＋ H2Oz ＋03 combined process could oxidize theveterinary wastewater effectively, and a sharp decrease of COD value was beneficial to further biological treatment.