Removal of chlorpyrifos and its hydrolytic metabolite 3,5,6-trichloro-2-pyridinol in constructed wetland mesocosms under soda saline-alkaline conditions: Effectiveness and influencing factors

Xiangfei Yu; Hui Zhu; Baixing Yan; Yingying Xu; Gary Bañuelos; Brian Shutes; Huiyang Wen; Rui Cheng

doi:10.1016/j.jhazmat.2019.03.052

Removal of chlorpyrifos and its hydrolytic metabolite 3,5,6-trichloro-2-pyridinol in constructed wetland mesocosms under soda saline-alkaline conditions: Effectiveness and influencing factors

J Hazard Mater. 2019 Jul 5:373:67-74. doi: 10.1016/j.jhazmat.2019.03.052. Epub 2019 Mar 18.

Authors

Xiangfei Yu¹, Hui Zhu², Baixing Yan³, Yingying Xu⁴, Gary Bañuelos⁵, Brian Shutes⁶, Huiyang Wen³, Rui Cheng³

Affiliations

¹ Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
² Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, PR China. Electronic address: zhuhui@neigae.ac.cn.
³ Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, PR China.
⁴ Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, 5088 Xincheng Street, Changchun 130118, PR China.
⁵ San Joaquin Valley Agricultural Science Center, Agricultural Research Service, USDA, 9611 South Riverbend Avenue, Parlier, CA 93648-9757, USA.
⁶ Urban Pollution Research Centre, Middlesex University, Hendon, London NW4 4BT, UK.

PMID: 30903958
DOI: 10.1016/j.jhazmat.2019.03.052

Abstract

Chlorpyrifos (CP) is frequently detected in agricultural effluent worldwide. Both CP and its hydrolytic metabolite 3,5,6-trichloro-2-pyridinol (TCP) can cause serious environment hazards, and require removal before discharged into rivers and/or lakes. The effectiveness and main influencing factors of CP and TCP removal in mesocosm-scale subsurface flow constructed wetlands (SSFCWs) were evaluated. Results indicated that CP in SSFCWs reduced to less than detection limit in 4 d and TCP to 2 μg L^-1 in 8 d. Higher influent CP concentrations lengthened the degradation process for both CP and TCP. The presence of co-existing inorganic nutrients restrained the degradation of CP during the hydraulic retention time of 2 h to 2 d. A higher pH resulting from the deterioration of soda saline-alkaline level accelerated the degradation of CP through the hydrolysis process. The SSFCWs with slag operating for another 88 d (i.e., 11 trails with HRT of 8 d for each trial) revealed a better and more stable treatment performance compared with previous studies. The results of this study demonstrated the positive feasibility of using SSFCWs with slag for the decontamination of CP-associated agricultural drainage or stormwater runoff.

Keywords: 3,5,6-Trichloro-2-pyridinol; Canna indica; Chlorpyrifos; Constructed wetlands; Soda saline-alkaline.

Publication types

Research Support, Non-U.S. Gov't