Journal
BIORESOURCE TECHNOLOGY
Volume 241, Issue -, Pages 269-275Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.05.072
Keywords
Constructed wetlands; Intermittent aeration; Biochar; Nitrogen removal; Nitrous oxide
Funding
- National Science Foundation of China (NSFC) [51508466]
- Fundamental Research Funds for the Central Universities [2452016067]
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Recently, vertical flow constructed wetlands (VFCWs) with intermittent aeration have been proven as an efficient technology to enhance removal efficiency of organics and nitrogen for wastewater treatment. However, the low denitrification effect in VFCWs was a problem for treating low carbon source wastewater. In this study, intermittent aeration and biochar, produced by biomass pyrolysis, was used to promote the nitrogen removal in VFCWs for low C/N domestic wastewater. Four systems, including non-aerated with non-biochar VFCW, non-aerated with biochar VFCW, aerated with non-biochar VFCW and aerated with biochar VFCW, were conducted for comparing their treatment performances. The results showed that much higher removal of COD (94.9%), NH4+-N (99.1%), TN (52.7%) and lower N2O emission (60.54 mu g.m(-2).h(-1)) was obtained in aerated VFCW with biochar addition. The results suggested that adding biochar to intermittent aerated VFCWs could be an effective and appropriate strategy for low C/N wastewater treatment. (C) 2017 Elsevier Ltd. All rights reserved.
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