Study on advanced nitrogen and phosphorus removal in constructed wetlands enhanced by corncob coupled waterworks sludge
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 av-erage 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 adsorp-tion 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 in-fluent 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 Class Ⅱ in GB 3838-2002 Comprehensive wastewater discharge standard at room temperature.
waterworks sludgelow carbon-nitrogen ratiocorncobconstructed wetlandnitrogen and phos-phorus removal
NETL
NSTL
万方数据
