生物-生态协同工艺深度处理城市污水

为实现碳源含量低、营养盐含量高的城镇污水高效、低耗地脱氮除磷,提出以生物、生态协同组合模式脱氮除磷.试验规模为100 m3/d,其中生物段为悬浮式活性污泥系统,生态段为人工湿地和稳定塘的串联系统.根据进水特征和单元工艺的特性调节单元工况类型和运行参数,合理分配两段污染物负荷,协同组合两段工艺,达到生物段灵活、高效性和生态段低耗、稳定性的最佳结合.研究表明,生物段HRT 6~8 h、人工湿地水力负荷0.34~0.54 m3/(m2.d)时,组合工艺COD去除率为90%、TN去除率为60%~80%、TP去除率为99%,出水可作为湖泊的补充水源利用,达到保护湖泊生态的目的.

Collaborative technology of biological and ecological treatment of municipal wastewater

In order to reach the reasonable removal of N/P in the municipal wastewater with the features of low concentration of organic substrate,high concentration of nutritious salts and diverse qualities,an optimal combinative technology of biological and ecological treatment was put forward.The design capacity to treat with wastewater was 100 m3/d.The biological unit was active sludge process,the ecological unit was combination of constructed wetland and plant stabilization pond.In the pilot scale study,various kinds of substrate loads were distributed between the two treatment stages so that the advantages of flexibility and high efficiency of the biological treatment were optimally combined with those of low cost consumption and stability of the ecological treatment.The results of this study indicate that the removal of COD,TN,TP is respectively 90%,60%-80% and 90% when the HRT of biological unit is 6-8 h and the hydraulic load of constructed wetland is 0.34-0.54 m3/(m2·d).The effluent can be used to restore healthy ecological environment of the confine polluted water bodies.