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Shubiao Wu

Comparative laboratory-scale study of resorcinol and nitrogen removal in different treatment wetlands

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  • Shu Biao Wu
  • Tao Lv, College of Engineering, China Agricultural University
  • ,
  • Peter Kuschk, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Li Chen, China Agricultural University
  • ,
  • Ren Jie Dong, China Agricultural University

The current knowledge on the treatment of resorcinol- and nitrogen-containing wastewater in different treatment wetlands is limited. This study investigated three laboratory-scale treatment wetlands, namely, floating wetland, planted wetland and unplanted wetland, treating artificial wastewater containing resorcinol and ammonium. Under the inflow resorcinol concentration of 10 mg/L, these wetlands exhibited a removal efficiency of approximately 94% on average, with a specific area removal rate of 260 mg/(m2 ·d), regardless of wetland type and the presence of plants. These results suggest that treatment of resorcinol-containing wastewater by wetlands is a low-cost and ecological alternative. Compared with the dynamics of ammonium in the unplanted wetland, the high ammonium removal rate (>95%) observed for the planted and floating wetlands strongly indicated that the plants stimulated ammonium oxidation processes mainly by releasing oxygen from the roots. Acidification at pH 3, which can be attributed to an active nitrification process and the secretion of hydrogen ions by the plant roots, was observed in the floating wetland. The low pH buffer capacity could be caused by the low content of dissolved inorganic carbonates, and the use of substrate may act as a barrier to prevent rapid diffusion of carbon dioxide from the pore water to the atmosphere. The significant nitrate accumulation rate of 20 mg/L noted in the floating wetland indicated a limited denitrification process due to the high redox condition (600 mV). A better oxygenated condition for the floating wetland is beneficial to oxidation removal of organic compounds and ammonium, but it may not be good for such reduction processes as denitrification.

OriginalsprogEngelsk
TitelAdvances in Environmental Technologies
Antal sider11
Vol/bind726-731
Udgivelsesår2013
Sider1643-1653
ISBN (trykt)9783037857427
DOI
StatusUdgivet - 2013
Eksternt udgivetJa
Begivenhed2013 2nd International Conference on Energy and Environmental Protection, ICEEP 2013 - Guilin, Kina
Varighed: 19 apr. 201321 apr. 2013

Konference

Konference2013 2nd International Conference on Energy and Environmental Protection, ICEEP 2013
LandKina
ByGuilin
Periode19/04/201321/04/2013
SerietitelAdvanced Materials Research
Vol/bind726-731
ISSN1022-6680

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