Experimental Study on Microbiologically Enhanced Constructed Wetland Treatment of TN and NH3-N in Simulated Initial Rainwater
Aiming at the problems of low removal efficiency of total nitrogen and ammonia nitrogen in vertical flow constru-cted wetland with gravel substrate when treating initial rainwater.A vertical flow constructed wetland system with gravel or zeolites substrates was constructed and inoculated with domesticated activated sludge,focusing on the removal effects of microbial-enhanced vertical flow constructed wetland with different substrates on TN,NH3-N,and to investigate the structure of microbial community in microbial-enhanced constructed wetland.The results showed that the constructed wetland using zeolite as the wetland substrate had strong denitrification ability.After inoculation with sludge,the average removal rates of total nitrogen and ammonia nitrogen in the constructed wetland with sand and gravel substrate were 63.63％-75.09％and 56.49％-72.18％,respectively.The average effluent concentrations were 3.76-5.36 and 2.83-4.57 mg/L.The microbial community in the wetland system after sludge inoculation had high diversity and relative abundance.The Patescibacteria phylum had a high abundance in wetland systems,which helped to improve the denitrification function of constructed wetland systems.
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