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| Removal of Ｓulfonylurea Ｈerbicides in Ｄrinking Ｗater Ｔreatment Ｐrocesses |
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| KeyWord:sulfonylurea herbicides; coagulation; powder activated carbon adsorption; chlorination |
| Author Name | Affiliation | | WANG Bin-nan | College of Resource and Environmental Sciences, Nanjing Agricultural University | | LIU Guo-qiang | College of Resource and Environmental Sciences, Nanjing Agricultural University | | XIE Wei-ping | Yixing Environmental Monitoring Station of Jiangsu | | KONG De-yang | Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of PRC | | LU Jun-he | College of Resource and Environmental Sciences, Nanjing Agricultural University |
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| Abstract: |
| Sulfonylurea herbicides are used to kill broadleaf weeds and some annual grasses. The widely application of these herbicides coupled with their resistance to photolysis, hydrolysis, and microbial degradation causes serious concern. Sulfonylurea herbicides have been detected in natural waters and could be potentially exposed to human beings via portable use. Thus, the removal of 5 representative sulfonylurea herbicides in simulated water treatment processes including coagulation, activated carbon adsorption, and chlorine disinfection was systematically investigated. Results showed that coagulation/sedimentation had little effect on the removal of the herbicides, with the average removal rates less than 10%. Powder activated carbon adsorption was apparently more effective with removal rates of 50%~70%. Nonetheless, this process could not completely eliminate the herbicides from water. Sulfonylurea herbicides were nearly completely removed during chlorination process. However, it was found that this process generated stable products which may related the heterocyclic moieties of sulfonylurea molecules. In summary, current drinking water treatment processes cannot provide enough protection for human population from exposure to sulfonylurea contamination which may be a ubiquitous problem. |
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