Dioxins, which are of the most toxic materials on the earth, are principal emitted from waste incineration process. The molecular structures, toxicity parameters, such as toxicity equivalency factor, tolerable daily i...Dioxins, which are of the most toxic materials on the earth, are principal emitted from waste incineration process. The molecular structures, toxicity parameters, such as toxicity equivalency factor, tolerable daily intake and physic-chemical properties of dioxins are briefly summarized. Three formation mechanisms of dioxins in waste incineration process, namely as de novo synthesis, mechanisms involving small organic molecular as precursors and homogenous gas phase reaction mechanism are alto reviewed. The influencing factors for dioxins formation during waste incineration process are also discussed. Three major methods for reducing dioxins emission from waste incineration process are discussed based upon the formation mechanisms and influencing factors. A new waste incineration process with low dioxins emission and low hydrogen chloride corrosion has been proposed based on multi- stage unit operation principal according to formation mechanisms of dioxins and potential production location in waste incinerators.展开更多
Flue gas of emission source and ambient air samples were collected and analyzed.Dioxins concentrations in flue gas and air samples ranged from 0.56 to 1.90 ngI-TEQ/m3 with average of 1.30 ngI-TEQ/m3 and from 0.11 to 0...Flue gas of emission source and ambient air samples were collected and analyzed.Dioxins concentrations in flue gas and air samples ranged from 0.56 to 1.90 ngI-TEQ/m3 with average of 1.30 ngI-TEQ/m3 and from 0.11 to 0.36 pgI-TEQ/m3 with average of 0.20 pgI-TEQ/m3,respectively.Dioxins congener profiles were compared using three methods and potential relationship of the two types of samples were discussed.展开更多
A method has been developed for the determination of seventeen 2,3,7,8,substituted congeners of polychlorinated dibenzo-p-dioxins and dibenzo-furans(PCDD/Fs) in material of electrical and electronic equipment—polyvin...A method has been developed for the determination of seventeen 2,3,7,8,substituted congeners of polychlorinated dibenzo-p-dioxins and dibenzo-furans(PCDD/Fs) in material of electrical and electronic equipment—polyvinyl chloride(PVC) using gel permeation chromatography(GPC)/fluid management system(FMS)/high resolution gas chromatography-high resolution mass spectrometry(HRGC-HRMS).Dibenzo-p-dioxins and dibenzo-furans was extracted from samples by Soxhlet extraction,purified by GPC and FMS.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC-HRMS using voltage selective ion record(VSIR)mode.The recoveries of fifteen isotopically labeled compound solution(LCS) were in the range of 61.9%-91.4%,RSD were in the range of 3.16%-6.01%.The quantitative detection limits of the method for 2,3,7,8-tetrachloro-dibenzo-furan(TCDF) and 2,3,7,8-tetrachloro-dibenzo-p-dioxin(TCDD) are both 0.1 pg/g.展开更多
With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% （mass fraction） urea, the emission c...With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% （mass fraction） urea, the emission concentrations of dioxin are 0.287 0.258 and 0.217 ng-TEQ/m3, respectively. The dioxin emission rates drop substantially compared to 0.777 ng-TEQ/m3 flee of urea. With an increase of the urea content, the concentration of SO2 emission reduces sharply. （NH4）2SO4, formed by the reaction of SO2 and NH3, goes into the dust and part of NH3 is released before reaction with the emission of exhaust gas. The NO~ emission presents an increasing trend because the reaction of NH3 and 02 at high temperature produces NOx. Based on the consideration of factors such as the effect of reducing dioxin emission, and the chemical composition of exhaust gas, 0.05% is the optimum adding content of urea.展开更多
X501 200402706 在日本关东地区水相沉积物及土壤中二恶英类物质的主要来源和分布情况研究=Dioxins in aquatic sediment and soil in the kanto region of Japan:major sources and their contributions[刊,英]/Takeo Sakurai …//Envi...X501 200402706 在日本关东地区水相沉积物及土壤中二恶英类物质的主要来源和分布情况研究=Dioxins in aquatic sediment and soil in the kanto region of Japan:major sources and their contributions[刊,英]/Takeo Sakurai …//Environ.Sci.&Technol..-2003,37(14).- 3133—3140 国图本研究针对日本关东地区水相表面沉积物和土壤中的二恶英(四到八氯二苯并-p-二恶英和二苯并呋喃)的主要来源进行了定量确认研究;并对其每一来源的分布情况进行了评价。展开更多
文摘Dioxins, which are of the most toxic materials on the earth, are principal emitted from waste incineration process. The molecular structures, toxicity parameters, such as toxicity equivalency factor, tolerable daily intake and physic-chemical properties of dioxins are briefly summarized. Three formation mechanisms of dioxins in waste incineration process, namely as de novo synthesis, mechanisms involving small organic molecular as precursors and homogenous gas phase reaction mechanism are alto reviewed. The influencing factors for dioxins formation during waste incineration process are also discussed. Three major methods for reducing dioxins emission from waste incineration process are discussed based upon the formation mechanisms and influencing factors. A new waste incineration process with low dioxins emission and low hydrogen chloride corrosion has been proposed based on multi- stage unit operation principal according to formation mechanisms of dioxins and potential production location in waste incinerators.
文摘Flue gas of emission source and ambient air samples were collected and analyzed.Dioxins concentrations in flue gas and air samples ranged from 0.56 to 1.90 ngI-TEQ/m3 with average of 1.30 ngI-TEQ/m3 and from 0.11 to 0.36 pgI-TEQ/m3 with average of 0.20 pgI-TEQ/m3,respectively.Dioxins congener profiles were compared using three methods and potential relationship of the two types of samples were discussed.
文摘A method has been developed for the determination of seventeen 2,3,7,8,substituted congeners of polychlorinated dibenzo-p-dioxins and dibenzo-furans(PCDD/Fs) in material of electrical and electronic equipment—polyvinyl chloride(PVC) using gel permeation chromatography(GPC)/fluid management system(FMS)/high resolution gas chromatography-high resolution mass spectrometry(HRGC-HRMS).Dibenzo-p-dioxins and dibenzo-furans was extracted from samples by Soxhlet extraction,purified by GPC and FMS.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC-HRMS using voltage selective ion record(VSIR)mode.The recoveries of fifteen isotopically labeled compound solution(LCS) were in the range of 61.9%-91.4%,RSD were in the range of 3.16%-6.01%.The quantitative detection limits of the method for 2,3,7,8-tetrachloro-dibenzo-furan(TCDF) and 2,3,7,8-tetrachloro-dibenzo-p-dioxin(TCDD) are both 0.1 pg/g.
基金Project(50904001) supported by the National Natural Science Foundation of ChinaProject(2010SQRL032D) supported by Anhui Provincial Key Science Foundation for Outstanding Young Talent,ChinaProject(TD200909) supported by Program for Innovative Research Team in Anhui University of Technology,China
文摘With the addition of urea as an inhibitor, four groups of reducing dioxin emission experiments in sintering pot were conducted. The results show that, adding 0.05%, 0.1% and 0.5% （mass fraction） urea, the emission concentrations of dioxin are 0.287 0.258 and 0.217 ng-TEQ/m3, respectively. The dioxin emission rates drop substantially compared to 0.777 ng-TEQ/m3 flee of urea. With an increase of the urea content, the concentration of SO2 emission reduces sharply. （NH4）2SO4, formed by the reaction of SO2 and NH3, goes into the dust and part of NH3 is released before reaction with the emission of exhaust gas. The NO~ emission presents an increasing trend because the reaction of NH3 and 02 at high temperature produces NOx. Based on the consideration of factors such as the effect of reducing dioxin emission, and the chemical composition of exhaust gas, 0.05% is the optimum adding content of urea.
文摘X501 200402706 在日本关东地区水相沉积物及土壤中二恶英类物质的主要来源和分布情况研究=Dioxins in aquatic sediment and soil in the kanto region of Japan:major sources and their contributions[刊,英]/Takeo Sakurai …//Environ.Sci.&Technol..-2003,37(14).- 3133—3140 国图本研究针对日本关东地区水相表面沉积物和土壤中的二恶英(四到八氯二苯并-p-二恶英和二苯并呋喃)的主要来源进行了定量确认研究;并对其每一来源的分布情况进行了评价。
