Herbicide mitigation in microcosms simulating stormwater basins subject to polluted water inputs

• Published in: Water research (Oxford) 2013-03, Vol.47 (3), p.1123-1135
• Main Authors: Bois, P., Huguenot, D., Jézéquel, K., Lollier, M., Cornu, J.Y., Lebeau, T.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Applied sciences; Basins; bioaugmentation; Biodegradation, Environmental; Biological and medical sciences; Bioremediation; Diuron; Earth sciences; Earth, ocean, space; Ecological engineering; Engineering and environment geology. Geothermics; Environmental Sciences; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Glycine - analogs & derivatives; Glycine - chemistry; Glyphosate; Herbicides; Life Sciences; microorganisms; Natural water pollution; nonpoint source pollution; Phytoremediation; Plants (organisms); Pollution; Pollution, environment geology; Rainwaters, run off water and others; Sediment; Soil and water pollution; Soil science; sorption; Stemming; Stormwater; vineyards; Water Pollutants, Chemical; water pollution; Water supplies; water supply; Water treatment and pollution; Watersheds
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2012.11.029

Non-point source pollution as a result of wine-growing activity is of high concern. Stormwater basins (SWB) found downstream of vineyard watersheds could show a potential for the mitigation of runoff water containing herbicides. In this study, mitigation of vinery-used herbicides was studied in microcosms with a very similar functioning to that recorded in SWB. Mitigation efficiency of glyphosate, diuron and 3,4-dichloroaniline (3,4-DCA) was investigated by taking into account hydraulic flow rate, mitigation duration, bioaugmentation and plant addition. Mitigation efficiency measured in water ranged from 63.0% for diuron to 84.2% for 3,4-DCA and to 99.8% for glyphosate. Water-storage duration in the SWB and time between water supplies were shown to be the most influential factors on the mitigation efficiency. Six hours water-storage duration allowed an efficient sorption of herbicides and their degradation by indigenous microorganisms in 5 weeks. Neither bioaugmentation nor plant addition had a significant effect on herbicide mitigation. Our results show that this type of SWB are potentially relevant for the mitigation of these herbicides stemming from wine-growing activity, providing a long enough hydraulic retention time. [Display omitted] ► Stormwater basins (SWB) downstream of vineyards potentially mitigate herbicides. ► Microcosms mimicked physico-chemical conditions and hydraulic regime of SWBs. ► Mitigation efficiency of glyphosate, diuron and 3,4-dichloroaniline was investigated. ► Efficient sorption of herbicides in microcosms required a storage time of 6 h ► Herbicides in microcosm sediments were dissipated in 5 weeks.