畜禽养殖污水处理中微波催化氧化法的参数优化

Optimization of Parameters for Microwave Catalytic Oxidation in Livestock Farming Wastewater Treatment

该研究拟对微波催化氧化处理畜禽养殖污水技术进行参数优化。以厌氧消化池内的污水为研究对象,分别研究了pH、微波时间、微波功率、催化剂用量、过氧化氢用量5个因素对化学需氧量(COD)去除率的影响;采用响应曲面法中的Box-Behnken试验设计,以COD去除率为响应值,以微波时间、微波功率、活性炭用量为影响因素,建立数学模型。通过方差分析可知,影响因素显著性顺序为:微波功率>活性炭用量>微波时间,微波功率和微波时间的交互作用对COD去除率影响显著;模型预测的最佳条件组合为:微波时间14.83 min,微波功率320 W,活性炭用量14 g·L^(-1),COD去除率为89.79%,该反应条件下3组平行试验的COD平均去除率为90.27%,与预测值相对误差为0.54%。采用微波催化氧化技术处理畜禽污水,可以满足《畜禽养殖业污染物排放标准》(GB18596)中对COD<100 mg·L^(-1)的一级排放要求。

The microwave catalytic oxidation technology was used to treat livestock farming wastewater,and the effects of five factors,namely pH,microwave time,microwave power,catalyst dosage,and hydrogen peroxide dosage,on the COD removal rate were studied in anaerobic digesters.The Box-Behnken experimental design in response surface method was used,with COD removal rate as the response value,the microwave time,microwave power and activated carbon dosage as the influencing factors,and the Box-Behnken experimental design was used to establish a mathematical model.The analysis of variance showed that the order of significance of the influencing factors was:microwave power>activated carbon dosage>microwave time,and the interaction between microwave power and microwave time had a significant effect on the COD removal rate.The model predicted the optimal conditions,which were indicated as microwave time 14.83 min,microwave power 320 W,and activated carbon dosage 14 g·L^(-1).The removal rate of COD was 89.79%,the relative error between the model-predicted and the measured values was 0.54%.Microwave catalytic oxidation technology can be adopted for livestock wastewater to meet the first discharge standard of COD<100 mg·L^(-1) in Pollutant Emission Standards for Livestock and Poultry Farming(GB18596).