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Shubiao Wu

Response of removal rates to various organic carbon and ammonium loads in laboratory-scale constructed wetlands treating artificial wastewater

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  • Shubiao Wu
  • Peter Kuschk, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Arndt Wiessner, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Matthias Kästner, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Changle Pang, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

High levels (92 and 91%) of organic carbon were successfully removed from artificial wastewater by a laboratory-scale constructed wetland under inflow loads of 670 mg/m2·d (100 mg/d) and 1600 mg/m2d (240 mg/d), respectively. Acidification to pH 3.0 was observed at the low organic carbon load, which further inhibited the denitrification process. An increase in carbon load, however, was associated with a significant elevation of pH to 6.0. In general, sulfate and nitrate reduction were relatively high, with mean levels of 87 and 90%, respectively. However, inhibition of nitrification was initiated with an increase in carbon loads. This effect was probably a result of competition for oxygen by heterotrophic bacteria and an inhibitory effect of sulfide (S2-) toxicity (concentration approximately 3 mg/L). In addition, numbers of healthy stalks of Juncus effusus (common rush) decreased from 14 000 to 10 000/m2 with an increase of sulfide concentration, indicating the negative effect of sulfide toxicity on the wetland plants.

TidsskriftWater Environment Research
Sider (fra-til)44-53
Antal sider10
StatusUdgivet - jan. 2013
Eksternt udgivetJa

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