pH值和碱度对厌氧折流板反应器运行的影响

为考察pH值和碱度对厌氧折流板反应器(ABR)高效、稳定运行的影响,采用一个有效容积为28 L的4格室ABR反应器处理豆制品废水。ABR反应器运行72 d的结果表明:在启动阶段的前期外加碱液调节进水pH值,使pH值和碱度分别基本稳定在6.0～7.0和1 000～1 300mg/L,运行效果良好。启动45 d时,停止外加碱液对进水pH值进行调节,系统仍稳定运行,但启动阶段出现丙酸浓度缓慢上升现象。在反应器稳定运行阶段,各格室的pH值分别为(4.5～6.0)、(5.5～6.8)、(6.8～7.2)、(7.1～7.3),碱度基本处在1 000～1 400 mg/L,反应器出水的发酵产物含量<100 mg/L(乙酸占90%以上),对COD的去除率保持在90%以上。

Effect of pH and Alkalinity on Operation of Anaerobic Baffled Reactor

A 4-compartment anaerobic baffled reactor(ABR) with an effective volume of 28 L was used to treat soybean processing wastewater.The influence of pH and alkalinity on the operation of ABR was investigated.The operation results for 72 d indicated that the reactor attained good operation effect in the early stage of start-up by adding alkaline to the influent.pH and alkalinity were controlled at 6.0 to 7.0 and 1 000 to 1 300 mg/L,respectively.After 45 d of startup without adding alkalinity to control pH of the influent,the reactor could also run well.However,slow increase of propionic acid in the start-up stage was observed.In continuous operation stage of ABR,the pH of each compartment was 4.5 to 6.0,5.5 to 6.8,6.8 to 7.2,and 7.1 to 7.3,and the alkalinity was 1 000 mg/L to 1 400 mg/L.The fermentation product in the effluent was less than 100 mg/L(acetic acid was more than 90%),and the removal rate of COD was above 90%.