柠檬酸废水厌氧处理工艺优化研究

目的]得到更高的COD去除率以指导柠檬酸工业废水的处理。方法]研究了柠檬酸废水厌氧处理过程中主要可控因素酸化时间、厌氧水力停留时间以及厌氧进水COD浓度对COD去除率的影响,并用响应面法进行了COD去除率优化。结果]酸化时间与其他2个因素基本没有交互作用,厌氧停留时间和厌氧进水COD浓度对COD去除率有显著影响,而且有交互作用。优化的最佳工艺条件为酸化时间1.53 h,厌氧水力停留时间3.52 h,厌氧进水COD浓度2 698 mg/L,预测最大COD去除率为93.31%,验证试验实际测得去除率为93.23%。结论]用响应面法优化柠檬酸废水厌氧处理过程,可得到较好的优化结果。

Process Optimization on Anaerobic Treatment of Citric Acid Wastewater

Objective] The aim was to obtain higher COD removal rate so as to guide the process of citric acid industrial wastewater.Method] The effects of controllable factors,acidification time,hydraulic retention time,and influent COD concentration,in-anaerobic treatment process of citric acid wastewater on COD removal rate were studied and the COD removal rate was optimized by response surface method.Result] There was no interaction between acidification time and the other two factors.It was showed that hydraulic retention time and influent COD concentration had significant effect on COD removal rate and there was interaction between the two factors.The optimum COD removing process conditions was as follows: acidification time 1.53 h,hydraulic retention time 3.52 h and influent COD concentration 2 698 mg/L.Under the optimized conditions,the COD removal rate was 93.31% and it was much closed to the experimental result,93.29%.Conclusion] Using response surface method to optimize the anaerobic treatment of citric acid wastewater can result in optimized achievement.