Vacuum ultraviolet/ultraviolet (VUV/UV) process has been applied to water treatment recently, but little is known about its efficacy and mechanism for pesticide degradation. This study investigated the degradation kinetics and mechanism of a typical organophosphorus pesticide, dimethoate (DMT) by VUV/UV, and then the economic feasibility was assessed. DMT degradation followed well the pseudo-first-order reaction kinetics at an initial concentration of ≤5.0 mg L. DMT was degraded by 97.8% after 10 min of VUV/UV exposure (VUV fluence = 12 mJ cm), whereas by only 5.2% after 10 min of UV exposure (UV fluence = 156 mJ cm). The apparent quantum yield of DMT degradation by VUV/UV was determined to be 0.19, and at most 50.7% of hydroxyl radicals (HO) generated from VUV photolysis of water could be utilized for DMT degradation. As the pH increased from 5.0 to 9.0, the DMT degradation rate decreased from 0.43 to 0.23 min. DMT degradation pathways in the VUV/UV process were proposed based on identified organic intermediates and inorganic ions. SO was first released due to HO attack on the SP bond of DMT, which governed the DMT degradation efficiency; while the release of PO was pertinent to the DMT mineralization efficiency. DMT solution toxicity was significantly reduced after VUV/UV treatment. An electrical energy-per-order (E) value of 0.57 kWh m Order demonstrated the economic feasibility of the VUV/UV process for DMT removal in small-scale drinking water treatment.
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| http://dx.doi.org/10.1016/j.chemosphere.2021.129724 | DOI Listing |
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