玉米芯耦合给水厂污泥强化人工湿地深度脱氮除磷研究

Study on advanced nitrogen and phosphorus removal in constructed wetlands enhanced by corncob coupled waterworks sludge

为了实现给水厂污泥的资源化利用,以某水厂污泥为例,分析了其理化性质与吸附除磷特性,并探究了玉米芯耦合给水厂污泥组合填料人工湿地系统在不同季节温度下的脱氮除磷效果。研究结果表明,给水厂污泥的平均铁、铝含量分别为(23.14±0.04)mg/g、(46.2±0.2)mg/g,磷饱和吸附容量为7.89 mg/g,污泥吸附磷的过程符合准二级动力学(R2=0.997)与Langumir模型(R2=0.979);湿地系统主要利用给水厂污泥吸附除磷,并依赖玉米芯进行异养反硝化脱氮;在HRT为1 d,进水氮、磷浓度满足GB 8978—1996《污水综合排放标准》一级A标准的条件下,常温条件下出水氮、磷浓度均达到GB 3838—2002《地表水环境质量标准》Ⅱ类水标准。

In order to achieve the resource utilization of waterworks sludge,taking sludge from a waterwork as the research object,its physicochemical properties and phosphorus removal characteristics were analyzed,and the synchronous nitrogen and phosphours removal effects of the constructed wetland system with waterworks sludge/corncob composite fillers at different seasonal temperatures were explored.The results showed that,the average iron and aluminum content of the sludge from the waterwork were(23.14±0.04)and(46.2±0.2)mg/g respectively,the saturated adsorption capacity of phosphorus was 7.89 mg/g.The process of phosphorus adsorption by the sludge conforms to quasi second order kinetics(R2=0.997)and Langumir model(R2=0.979).The wetland system mainly used sludge adsorption for phosphorus removal,and relied on corncob for heterotrophic denitrification.Under the condition that,the HRT was 1 d,the nitrogen and phosphorus concentration in the influent water met the requirement of level A grade 1 in GB 8978—1996 Comprehensive wastewater discharge standard,the nitrogen and phosphorus concentration in the effluent water reached the requirement of ClassⅡin GB 3838—2002 Comprehensive wastewater discharge standard at room temperature.