利用AB法的A段处理低浓度市政污水

Use of A-stage in AB Process for Treatment of Low Strength Municipal Wastewater

白沙门污水处理厂4年多的运行表明,利用AB法的A段处理低浓度市政污水时可获得较好的净化效果,但系统的DO、泥龄等参数变化区间窄小,当受到溶解性有机负荷冲击时易引发高粘性污泥膨胀。针对原辐流式中沉池易出现短流的情况,增设了一级稳流装置,使出水水质得到了明显改善。

The Baishamen Wastewater [JP2]Treatment Plant has operated for four more years. The opera-[JP]tional experiences show that use of A-stage in AB process for treatment of low strength municipal wastewater can get better treatment effect. However, due to narrow variation range in the parameters such as DO and sludge retention time, the system is liable to suffer the dissolved organic shock loading, which results in the high sticky sludge bulking. Because of the frequent occurrence of short-circuiting current in radial-flow type mid-clarifier, an additional primary steady flow device is set up, which is helpful to great improvement of effluent quality.