水热法降解医疗废物焚烧飞灰中二恶英的研究  

Hydrothermal Decomposition of Polychlorinated Divenzo-p-dioxins and Dibenzofurans in Fly Ash of Medical Waste Incinerator

作　　者：王宇峰[1] 李晓东[1] 金剑[1] 严建华[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《中国电机工程学报》2010年第26期56-61,共6页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2007AA06Z336;2007AA061302);国家自然科学基金项目(50576082)~~

摘　　要：研究了水热法对医疗废物焚烧飞灰中二恶英的降解作用。水热反应在带有磁力搅拌器的密闭反应釜中进行,考查了固液比(飞灰与水质量之比,S/L)、反应温度、NaOH与飞灰质量比w(NaOH)/w(FA)对二恶英降解的影响。原始飞灰和经过水热反应后飞灰中的17种有毒的二恶英含量采用高分辨气相色谱质谱联用仪分析技术测定。研究结果表明固液比改变对二恶英的降解影响不大,而温度变化和添加碱性物时能带来很大的影响。在温度为250℃,固液比和w(NaOH)/w(FA)均为1:10时,二恶英的降解率达到99.46%,水热法降解医疗废物焚烧飞灰中的二恶英效果显著。Hydrothermal treatment technology was used to remove polychlorinated divenzo-p-dioxins and dibenzofurans（PCDD/Fs）from heavily contaminated medical waste incinerator fly ash（MWIFA）.The experiments were carried out in an extraction vessel with magnetic stirring.The effects of experiment parameters including S/L ratio,reaction temperature,and NaOH/ash weight ratio on decomposition of PCDD/Fs were investigated.PCDD/Fs（only 17 toxic congeners） of original and hydrothermal treated fly ash（FA） were analyzed by high-resolution gas chromatography-mass spectrometry（HRGC-HRMS）.The results indicated change of S/L ratio had little effect on degradation of PCDD/Fs,while concentrations of PCDD/Fs in FA decreased largely at relatively high temperature and with alkaline ingredients.Under condition of temperature 250 ℃,S/L ratio and NaOH/ash weight ratio 1：10,removal efficiency for PCDD/Fs reached 99.46%.These results revealed that hydrothermal treatment was a effective technology for PCDD/Fs decomposition in FA.

关 键 词：二恶英 水热法 医疗废物 飞灰 重金属 

分 类 号：X705[环境科学与工程—环境工程]