构造湿地在污水处理厂二级出水后的深度处理应用研究

Application of Advanced Treatment of Constructed Wetland After Sewage Treatment Plants

中国大部分污水处理厂目前均采用二级处理工艺,主要去除碳源污染物,而消解氮、磷类污染物的效果较差。在传统二级处理工艺基础上,对中水进行三级深度处理,BOD5、SS以及COD类污染物去除效果明显,但运行成本较高,处理量受限。人工构造湿地利用基质-植物-微生物复合生态系统的物理、化学和生物的三重协同作用,通过过滤、吸附与沉淀等作用,以及微生物同化分解和植物吸收转化等途径,可有效去除污水中的氮、磷、SS、有机物及重金属等污染物,且具有低投资、低运转费、低维持成本等特点。

Currently secondary treatment processes of most sewage treatment plants are used primarily to remove carbon contaminants,and digestion of nitrogen and phosphorus pollutants is less eftective.Secondary,effluent can only achieve the B level of national ＂ Urban Sewage Treatment Plant Pollutant Discharge Standards＂ （GB 18918-2002）,which,after being discharged into natural water bodies,will lead to eutrophication.Based on the upgrading of conventional secondary treatment process,the tertiary treatment was carried out on the water depth processing,BOD5,SS and COD removal efficiency was significantly obvious,however,the operating costs are higher,and the processing capacity is limited.Artificial constructed wetlands using physical,chemical and biological triple synergy of matrix-plant-microbe complex ecosystem,through the action such as filtration,adsorption and precipitation,as well as microbe assimilation decomposition and plant absorption and transformation,can effectively remove SS,organic matter,nitrogen,phosphorus,heavy metals and other pollutants in the wastewater,with low investment,low operation fees,and low maintenance costs,etc.Based on comparing the traditional mode with the wetlands mode of tertiary treatment of wastewater.