村镇低浓度生活污水对SBR工艺的影响研究

Study on the Influence of Low Concentration of Domestic Sewage on SBR Process in Villages and Towns

我国村镇生活污水浓度普遍偏低,雨污管道混接,地表、地下水渗入管网和排水量的增大是主要的原因,采用SBR工艺建立分散式污水处理站点是较为高效合理的运行方式。低浓度生活污水对SBR工艺生化系统会造成不良的影响,进水有机物浓度过低导致活性污泥浓度下降,最终出水无法稳定达标。实验结果表明,活性污泥浓度在1500~2500mg/L范围时,进水COD为70mg/L是维持微生物最低代谢要求的下限值,可依据此进水COD下限准确和及时的对污水处理厂及污水处理设施投加碳源。

The concentration of domestic sewage in villages and towns in China is generally low, the mixed connection of rain and sewage pipes, the increase of surface and groundwater infiltration pipe network and drainage is the main reason, and the use of SBR process to establish decentralized sewage treatment stations is a more efficient and reasonable way of operation. Low concentration of domestic sewage will have a negative impact on the biochemical system of the SBR process,and the concentration of organic matter in the inlet water is too low, resulting in a decrease in the concentration of activated sludge, and the final effluent cannot be stable and up to standard. The experimental results show that when the concentration of activated sludge is in the range of 1500~2500 mg/L, the inlet water COD of 70 mg/L is the lower limit of maintaining the minimum metabolic requirements of microorganisms, and the carbon source can be added to the sewage treatment plant and sewage treatment facilities in an accurate and timely manner according to the lower limit of the inlet water COD.