首页|Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using a new manganese-containing substrate
Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using a new manganese-containing substrate
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Constructed wetlands(CWs)are widely used to treat secondary effluent.However,simultaneously removing ammonia(NH4+-N)and nitrate(NO3--N)is challenging because of insufficient oxygen and carbon sources.In this study,a novel composite material(MPCM)comprising MnO2 and polycaprolactone was developed as a substrate for CWs to enhance the synchronous removal of NH4+-N and NO3--N.The CWs with a higher MPCM content(H-CW),lower MPCM content(L-CW),and controlled CW(C-CW)exhibited average NH4+-N removal efficiencies of 75.69％,70.49％,and 52.40％,respectively.The 15N isotope tracking technique showed that NH4+-N removal was attributed to anaerobic ammonia oxidation mediated by MnO2 reduction(Mnammox),which accounted for 17.16％-27.24％of the NH4+-N removal in the composite material layers(0-20 cm)of the H-CW and L-CW.The richness of ammonia oxidizers in the upper layers(40-50 cm)of the H-CW and L-CW further facilitated NH4+-N removal.Moreover,the average total nitrogen(TN)removal efficiencies of the H-CW and L-CW were 1.99 and 1.59 times that of C-CW,respectively,owing to enhanced denitrification by MPCM.Furthermore,N2O emissions were reduced by 81.31％and 70.83％in the H-CW and L-CW,respectively.This study provides an effective approach for improving nitrogen removal and reducing N2O emissions during the treatment of secondary effluent by CWs.
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