Pilot Study on the Treatment of Tail Water from Sewage Treatment Plant by Horizontal Subsurface Flow Constructed Wetland under Two Substrates
In order to compare the removal efficiency of pollutants by horizontal subsurface flow constructed wetlands with shale ceramsite and gravel under different hydraulic loading conditions,a pilot experimental device of constructed wetland was set up to treat the tail water of a sewage treatment plant in Wuhan,and the high-throughput sequencing technology was used to compare and analyse microbial community structure of two substrates.The results showed that under the condition of low hydraulic load[0.3～0.6 m3/(m2·d)],the removal efficiency of COD,NH3-N and TN was better,while the removal efficiency of TP was better under the condition of high hydraulic load[1.2 m3/(m2·d)].The constructed wetland system based on shale ceramsite has better pollutant removal effect than gravel under different hydraulic loads.The abundance of functional bacteria such as Pseudomonas,Flavobacterium,Arenimonas,Saccharimonadales,Paracoccus,Nitrospira and Terrimonas in constructed wetland with shale ceramsite was higher than that with gravel,which was beneficial to the removal of pollutants in the wetland.Therefore,the shale ceramsite horizontal subsurface flow constructed wetland has higher purification efficiency for the tail water of the sewage treatment plant.It is suggested that the application of shale ceramsite should be combined with the actual situation in the project.
NETL
NSTL
万方数据
