Effects of tidal operation on pilot-scale horizontal subsurface flow constructed wetland treating sulfate rich wastewater contaminated by chlorinated hydrocarbons
Language English Country Germany Media print-electronic
Document type Journal Article
PubMed
27770325
DOI
10.1007/s11356-016-7871-y
PII: 10.1007/s11356-016-7871-y
Knihovny.cz E-resources
- Keywords
- Chlorobenzene, Constructed wetland, Groundwater, Perchloroethene, Tidal flow,
- MeSH
- Biodegradation, Environmental MeSH
- Water Pollutants, Chemical analysis MeSH
- Hydrocarbons, Chlorinated analysis MeSH
- Water Purification methods MeSH
- Wetlands * MeSH
- Wastewater chemistry MeSH
- Pilot Projects MeSH
- Sulfates analysis MeSH
- Sulfides analysis MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Germany MeSH
- Names of Substances
- Water Pollutants, Chemical MeSH
- Hydrocarbons, Chlorinated MeSH
- Waste Water MeSH
- Sulfates MeSH
- Sulfides 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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