UCT工艺处理低C/N值城市污水的试验研究

Experimental Research on Treatment of Municipal Wastewater with Low C/N Ratio by UCT Process

采用UCT工艺处理低C/N值城市污水,考察了其处理效果及影响因素。结果表明:UCT工艺对COD的平均去除率为87.3%,进水中较高浓度的氨氮对COD去除效果有一定的影响;系统运行稳定后,对氨氮的去除率可保持在90%以上,硝化效果较好;在无外加碳源的情况下,UCT工艺对总氮的去除率为50%左右,投加甲醇碳源调节污水的C/N值为6.2左右时,对总氮的去除率可稳定在80%以上;进水中较高浓度的氨氮对系统除磷效果的影响较大,在硝化效果不好的情况下对总磷的去除率可达86%,在硝化效果较好的情况下除磷效率较低,为50%左右。

The UCT process was used to treat municipal wastewater with low C/N ratio. The treat- ment effect and the influencing factors were investigated. The average removal rate of COD was 87.3%. The high NH4 - N concentration in influent affected the removal of COD. The removal rate of NH4 - N was more than 90%0 in the stable stage, and the nitrification efficiency was good. Without external carbon source, the removal rate of TN was about 50%, and more than 80% when methanol was added as carbon source to adjust the C/N ratio to about 6.2. The high NH4 - N concentration in influent affected the re- moval of phosphorus greatly. In the case of poor nitrification efficiency, the removal rate of TP was 86% , conversely, the removal rate was as low as about 50%.