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Shubiao Wu

Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system

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  • Xinxin Ju, China Agricultural University
  • ,
  • Shubiao Wu
  • Yansheng Zhang, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2mg/L to less than 0.5mg/L with the decrease in current intensity from 1.5mA/cm2 to 0.57mA/cm2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric iron coagulant through the electro-dissolution of a sacrificial iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions.

OriginalsprogEngelsk
TidsskriftWater Research
Vol/bind59
Sider (fra-til)37-45
Antal sider9
ISSN0043-1354
DOI
StatusUdgivet - 1 aug. 2014
Eksternt udgivetJa

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