title: [Research on low-level Hg(II) removal from water by the heavy metal capturing agent].
abstract: Treatment of mercury containing wastewater using conventional approach is considered to be difficult to bring down its concentration to meet the discharge standard. In this study, we utilized dithiocarbamate (DTCR-2), 2,4,6-trimercaptotriazine(TMT-18B), Na2S and Ca(OH)2+ as the advanced treatment agents to remove low-level Hg2+ from water. Due to its better treatment effect, DTCR-2 was finally chosen as the most ideal option. The influence of pH value, dosage of DTCR-2, reaction time, initial Hg2+ concentration as well as other heavy metal ions on the Hg2+ removal were studied. The results showed that DTCR-2 had high removal efficiency under the following conditions: 100 microg x L(-1) of initial Hg2+ concentration, pH 8.0, 1.0 times stoichiometric ratio of DTCR-2 dosage and 10 min of reaction time, leading to 41.36 microg x L(-1) of residual Hg2+ concentration which was below the national discharge standard (50 microg x L(-1)). Moreover, three heavy metal ions including Cd2+, Pb2+ and Cu2+, inhibited the DTCR-2 capturing capacity towards Hg2+ and the inhibition effects followed this order: Cu2+ > Pb2+ > Cd2+, while Zn2+ promoted the Hg2+ removal. From this study, we could provide theoretical support for process design to deal with wastewater containing low mercury concentration using DTCR-2.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. 21114094@zju.edu.cn
authors.forename: Yun-jun
authors.initials: YJ
authors.lastname: Hu
authors.forename: Tian-tian
authors.initials: TT
authors.lastname: Sheng
authors.forename: Xiao-qin
authors.initials: XQ
authors.lastname: Xue
authors.forename: Li-sha
authors.initials: LS
authors.lastname: Tan
authors.forename: Xin-hua
authors.initials: XH
authors.lastname: Xu
mesh_terms: D002126:Calcium Hydroxide / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D013438:Sulfhydryl Compounds / Q000737:chemistry; D014227:Triazines / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014873:Water Pollutants / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D013438:Sulfhydryl Compounds; D014227:Triazines; D014873:Water Pollutants; D014867:Water; D008628:Mercury; C447403:2,4,6-trimercaptotriazine; D002126:Calcium Hydroxide