序批式反应器处理精对苯二甲酸废水

Treatment of Purified Terephthalic Acid Wastewater by Sequencing Batch Reactor

采用序批式反应器(SBR)处理模拟精对苯二甲酸(PTA)废水,考察了曝气量、沉降时间、进水方式等对对苯二甲酸(TA)生物降解效果的影响。实验结果表明,对于TA质量浓度小于1 500m g/L的废水,采用完全曝气SBR运行4h,TA和COD的去除率均能达到95%以上,TA平均去除速率随TA浓度的增加而增大。TA质量浓度为1 500m g/L时,曝气量、沉降时间和进水方式是影响其降解效果的主要因素。采用SBR处理高浓度PTA废水可克服污泥膨胀和抗冲击负荷能力弱的问题,且系统的稳定性和PTA废水的处理效果较好。

Simulated purified terephthalic acid （PTA）wastewater was treated by sequencing batch reactor （SBR）. The effects of aeration rate, settling time, feeding mode on the biodegradation of terephthalic acid（TA）were investigated. When the mass concentration of TA is less than 1 500 mg/L, the removal rate of TA and COD are both more than 95 % after aerating for 4 h in SBR. The average TA removal rate increases with the increasing of TA mass concentration. When the mass concentration of TA is 1 500 mg/L, the main factors affecting degradation are aeration rate, settling time and feeding mode. Treating high concentration PTA wastewater by SBR can solve the problems of sludge bulking and lack of shock load resistance capability, and the system has a good stability and treatment effect for PTA wastewater.