低溶解氧丝状菌污泥微膨胀在SBR中的可行性

Feasibility study on limited bulking of sludge containing filamentous bacteria with low dissolved oxygen in SBR

为了考察污泥微膨胀低能耗方法在间歇序批式(SBR)反应器中应用的可行性,采用实际生活污水进行试验,研究了污泥膨胀的启动、过度膨胀的抑制以及微膨胀的维持方法。结果表明,在pH7.0～8.0,温度(23±0.5)℃时,连续进水和单纯设置好氧段可以快速启动低氧丝状菌污泥膨胀。减少好氧时间和设置前置缺(厌)氧段可以有效地抑制丝状菌繁殖。微膨胀启动成功后,根据反应条件及处理要求的改变及时调整SBR运行方式,可将系统稳定地维持在微膨胀状态。低氧微膨胀状态下处理实际生活污水,出水氨氮浓度、磷浓度和悬浮物浓度(SS)可分别控制在4.5mg.L-1、0.2mg.L-1和5.0mg.L-1以下。每周期中联合利用DO、pH等在线参数可以实时了解系统生化反应的进程。

In order to investigate the feasibility of low energy cost limited bulking of sludge containing filamentous bacteria in sequencing batch reactor （SBR）,the start of sludge bulking,the inhibition of excessive bulking and the method maintaining limited bulking were studied by test using actual domestic sewage.The results show that,when pH is in the range of 7.0—8.0 and temperature （23±0.5）℃,continuous water feeding and simple aerobic segment can set up quick lauch hipoxic sludge filamentous bulking.Reducing time of supplying oxygen and pre-set anaerobic phase can effectively inhibit reproduction of filamentous bacteria.After the success of limited bulking starts,the system would be kept steadily at limited bulking state by timely adjustment operation mode of SBR,based on reaction conditions and processing requirements.Handling actual domestic wastewater under hipoxic limited bulking state,the effluent concentrations of NH＋4-N,PO3-4-P and SS can controlled separately at 4.5 mg·L^-1,0.2 mg·L^-1 and 5.0 mg·L^-1 below.The progress of biochemical reaction process in each cycle can be real-time understood from the analysis of online parameters like pH,DO and so on.