A novel aerated surface flow constructed wetland using exhaust gas from biological wastewater treatment: Performance and mechanisms

摘要

In this study, a novel aerated surface flow constructed wetland (SFCW) using exhaust gas from biological wastewater treatment was investigated. Compared with un-aerated SFCW, the introduction of exhaust gas into SFCW significantly improved NH4+-N, TN and COD removal efficiencies by 68.30 +/- 2.06%, 24.92 +/- 1.13% and 73.92 +/- 2.36%, respectively. The pollutants removal mechanism was related to the microbial abundance and the highest microbial abundance was observed in the SFCW with exhaust gas because of the introduction of exhaust gas from sequencing batch reactor (SBR), and thereby optimizing nitrogen transformation processes. Moreover, SFCW would significantly mitigate the risk of exhaust gas pollution. SFCW removed 20.00 +/- 1.23%, 34.78 +/- 1.39%, and 59.50 +/- 2.33% of H2S, NH3 and N2O in the exhaust gas, respectively. And 31.32 +/- 2.23% and 32.02 +/- 2.86% of bacterial and fungal aerosols in exhaust gas were also removed through passing SFCW, respectively.