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Shubiao Wu

Optimization of high-rate TN removal in a novel constructed wetland integrated with microelectrolysis system treating high-strength digestate supernatant

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  • Luchen Guo, China Agricultural University
  • ,
  • Keli He, China Agricultural University
  • ,
  • Shubiao Wu
  • Hao Sun, China Agricultural University
  • ,
  • Yanfei Wang, China Agricultural University
  • ,
  • Xu Huang, Chinese Academy of Sciences
  • ,
  • Renjie Dong, China Agricultural University

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/(m2·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. Aerated constructed wetlands integrated with a microelectrolysis-driven system show great potential for high-rate TN removal treating high-strength digestate supernatant.

TidsskriftJournal of Environmental Management
Sider (fra-til)42-51
Antal sider10
StatusUdgivet - 1 aug. 2016
Eksternt udgivetJa

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