Construction of vertical flow constructed wetland system with multi-aerobic and anerobic zones and its removal characteristics on pollutant
Aiming at the problem that the traditional vertical flow constructed wetland has weak nitrogen removal ability due to the lack of anaerobic and anoxic environment,in this study,the structure of the traditional vertical flow constructed wetland system was reconstructed,and a vertical flow constructed wetland system with inner and outer double-layer construction and multi-aerobic and anerobic zones was built.The denitrification ability of this wetland system was strengthened by increasing its anaerobic and anoxic volume,and its original nitrification capacity did not change.At different water saturation ratio and hydraulic residence time,the pollutant removal efficiency,matrix microbial community structure and the distribution characteristics of nitrogen cycling functional genes in the matrix of wetland system the evolution were studied.The results showed that the best removal rates of NH4+-N and COD occurred when the water saturation ratio of the outer layer was 1∶2 and the hydraulic residence time was 24 h;the abundance of nitrogen cycling functional microorganisms in the outer layer of the system was higher than that in the inner layer,which could promote both nitrification and denitrification functions of the system and raise the nitrogen removal rate of the system.The results of this study can provide a reference and basis for the popularization and application of vertical flow constructed wetland system with multi-aerobic and anerobic zones.
vertical flow constructed wetland system with multi-aerobic and anerobic zonessaturation ratio of waterremoval efficiencyfunctional bacteriafunctional gene
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