一体化空气提升SBR处理低C/N农村生活污水研究

THE PILOT STUDY OF AN INTEGRATED SYSTEM IN TREATING LOW CONCENTRATION DOMESTIC WASTEWATER IN RURAL AREA

实验设计了省却复杂出水装置的一体化空气提升序批式活性污泥反应器(SBR),用于处理低C/N农村生活污水的中试,考察了不同曝气强度、曝气时间以及沉淀时间对反应器净化效果的影响,并考察了反应器的抗冲击负荷。结果表明,综合脱氮除磷以及能耗方面考虑,SBR运行的优化工况为:调控曝气量使DO的质量浓度稳定在3mg/L左右,曝气3 h,沉淀1.5 h,可保证去除效果,且能耗较低,经反应器处理后出水COD、NH4+-N、TN、TP水质指标均可满足GB 18918-2002的二级要求,装置运行半年剩余污泥产量少,储泥池设计可满足1 a排1次泥的要求,维护管理方便且具有较强的抗冲击负荷,为农村分散式生活污水处理提供一种适用技术。

An integrated SBR reactor without the complicated discharge apparatus was developed and for treating the low concentration rural domestic wastewater in pilot scale. And the effect of different AI, AT and ST on the removal efficiency of the system is carried out. The performance of the resistance to the impact load of the system is also studied. Taking the nitrogen phosphorus removal and energy saving into consideration, the results show that the optimum parameters are as follows： AI guaranteeing mass concentration of DO about 3 mg/L, AT 3 h, ST 1.5 h. The water-quality index including COD,NH4^＋-N, TN, TP of the effluent can satisfy GB 18918-2002; Output of excess sludge is so small that the sludge tank enable the excess sludge drainage once a year. It also indicated that the application potential of the reactor to the decentralized wastewater treatment in rural areas, which requires not only reaching the mark, energy-saving, but operating easily, less excess sludge and with good performance of resistance to impact load.