期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 178, 期 -, 页码 42-51出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2016.04.044
关键词
Horizontal flow constructed wetlands; Anaerobic digestate supernatant; Intermittent aeration; Effluent recirculation; Microelectrolysis system
资金
- National Natural Science Funds [51308536]
- Beijing Science and Technology Council Funds [Z151100001115010]
- National Key Technology RD Program [2015BAD211304]
- Beijing Nova Program [2015B083]
The potential of high-rate TN removal in three aerated horizontal subsurface-flow constructed wetlands to treat high-strength anaerobic digestate supernatant was evaluated. Different strategies of intermittent aeration and effluent recirculation were applied to compare their effect on nitrogen depuration performance. Additional glucose supply and iron-activated carbon based post-treatment systems were established and examined, respectively, to further remove nitrate that accumulated in the effluents from aerated wetlands. The results showed that intermittent aeration (1 h on:1 h off) significantly improved nitrification with ammonium removal efficiency of 90% (18.1 g/(m(2). d)), but limited TN removal efficiency (53%). Even though effluent recirculation (a ratio of 1:1) increased TN removal from 53% to 71%, the effluent nitrate concentration was still high. Additional glucose was used as a post-treatment option and further increased the TN removal to 82%; however, this implementation caused additional organic pollution. Furthermore, the iron-activated carbon system stimulated with a microelectrolysis process achieved greater than 85% effluent nitrate removal and resulted in 86% TN removal. Considering the high TN removal rate, aerated constructed wetlands integrated with a microelectrolysis-driven system show great potential for treating high-strength digestate supernatant. (C) 2016 Elsevier Ltd. All rights reserved.
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