Effects of tidal operation on pilot-scale horizontal subsurface flow constructed wetland treating sulfate rich wastewater contaminated by chlorinated hydrocarbons
Jazyk angličtina Země Německo Médium print-electronic
Typ dokumentu časopisecké články
PubMed
27770325
DOI
10.1007/s11356-016-7871-y
PII: 10.1007/s11356-016-7871-y
Knihovny.cz E-zdroje
- Klíčová slova
- Chlorobenzene, Constructed wetland, Groundwater, Perchloroethene, Tidal flow,
- MeSH
- biodegradace MeSH
- chemické látky znečišťující vodu analýza MeSH
- chlorované uhlovodíky analýza MeSH
- čištění vody metody MeSH
- mokřady * MeSH
- odpadní voda chemie MeSH
- pilotní projekty MeSH
- sírany analýza MeSH
- sulfidy analýza MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Německo MeSH
- Názvy látek
- chemické látky znečišťující vodu MeSH
- chlorované uhlovodíky MeSH
- odpadní voda MeSH
- sírany MeSH
- sulfidy MeSH
Three different flow regimes were carried out in a pilot-scale horizontal subsurface flow constructed wetland-treating sulfate rich wastewater contaminated with monochlorobenzene (MCB) and perchloroethene (PCE). The three regimes were continuous flow, 7-day cycle discontinuous flow, and 2.5-day cycle discontinuous flow. The results show that intensifying the tidal regime (2.5-day cycle) significantly enhanced MCB removal before 2 m from the inlet and increasing PCE removal efficiency at 0.5 m. The PCE dechlorination process was promoted with tidal operation, especially under the 2.5-day cycle regime, with significant increases of cis-1,2- dichloroethenes (DCEs), vinyl chloride (VC), and ethene, but trans-1,2-DCE was significantly decreased after tidal operation. Due to the high sulfate concentration in the influent, sulfide was observed in pore water up to 20 and 23 mg L-1 under continuous flow and 7-day cycle regime, respectively. However, sulfide concentrations decreased to less than 4 mg L-1 under intensified tidal operation (2.5-day cycle). The increase of oxygen concentration in pore water through intensified tidal operation resulted in better MCB removal performance and the successful inhibition of sulfate reduction. In conclusion, intensifying tidal operation is an effective approach for the treatment of chlorinated hydrocarbons and inhibiting sulfide accumulation in horizontal subsurface flow constructed wetland.
College of Resources and Environment Huazhong Agricultural University Shizishan 1 Wuhan 430070 China
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