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- Title
Mitigation of Wastewater-Borne Chlorpyrifos in Constructed Wetlands: the Role of Vegetation on Partitioning.
- Authors
Chuan Wang; Biyun Liu; Dong Xu; Dan Zhang; Feng He; Qiaohong Zhou; Zhenbin Wu
- Abstract
Constructed wetlands (CWs) are regarded as a risk mitigation strategy for alleviating the risks associated with agricultural runoff that contains pesticides. We investigated the partitioning pattern of wastewater-borne chlorpyrifos, a widely used organophosphorus pesticide, in non-vegetated and vegetated CWs. Removal rates of chlorpyrifos calculated from inflow and outflow concentrations ranged from 87.65% to 96.57%. The average removal rate was significantly higher and more stable in vegetated CWs than in non-vegetated CWs. As determined using a mass-balance method, outflows, macrophytes, substrate micro-degradation, and "other" accounted for 5.23%, 22.7%, 15.96%, and 56.11%, respectively, of the chlorpyrifos in the vegetated system. Of all Iris pseudoacorus organs examined, the rhizome was dominant in biomass and gathered the largest amount of chlorpyrifos. Except for the uptake of chlorpyrifos by plants, the primary difference between vegetated and non-vegetated CWs was that there was a relatively low potential for chlorpyrifos micro-degradation and volatilization and photolysis in vegetated CWs than in non-vegetated CWs. Identification of this partitioning pattern elucidates the mechanisms underlying chlorpyrifos removal from wastewater in CWs.
- Subjects
CHLORPYRIFOS; HAZARD mitigation; CONSTRUCTED wetlands; AGRICULTURAL pollution; RISK mitigation of pesticides
- Publication
Polish Journal of Environmental Studies, 2017, Vol 26, Issue 1, p347
- ISSN
1230-1485
- Publication type
Article
- DOI
10.15244/pjoes/64375