The role of chemical formatting structures in biomass on the formation of dioxins and furans in soot deposits from the combustion of biomass

据估计，每年约有35万吨废木材通过“灰色”燃料市场用于英国国内木材燃烧。这些废木材大部分可能是干净的，然而，大量的，但数量未知的，可能受到污染。已证明燃烧受污染的木材会产生高浓度的二恶英和呋喃。这些二恶英和呋喃还与沉积在燃烧烟气系统或明火烟囱中的烟灰和焦炭有关。这些被二恶英和呋喃污染的煤烟沉积物构成了巨大的环境和健康风险。然而，关于二恶英和呋喃在废木材燃烧产生的烟尘沉积物中的形成，人们知之甚少。本研究拟在模拟家用木材燃烧烟道条件下，研究生物质燃烧产生的烟尘沉积物中二恶英和呋喃的形成。该研究将探讨由纤维素、半纤维素和木质素等主要生物质组分产生的烟灰的不同结构和表面化学性质如何影响二恶英和呋喃在前驱体和新生形成条件下的形成。此外，将从二恶英和呋喃形成的角度研究在各种操作条件下产生的一系列受污染的城市废木材燃烧产生的烟尘。利用模型生物质芳香族和含氧模型化合物进行的综合研究将有助于对与生物质成分和生物量相关的二恶英和呋喃形成的机制进行解释。该研究对了解生物质燃烧烟尘中二恶英和呋喃的形成机理具有重要意义。它还为政策制定、建议和风险评估多氯联苯/多氯联苯和多氯联苯在国内环境中积累对人类健康和环境的潜在危害提供了重要证据。这是一项雄心勃勃的提案，涉及超痕量有机微污染物，使用先进的分析技术，从根本上了解导致生物质燃烧形成二恶英和呋喃的重要前体和从头反应机制

It is estimated that ~350,000 tonnes/year of waste wood is used in UK domestic wood burning acquired via the 'grey' fuel market. Most of this waste wood is likely to be clean, however, a significant, yet unknown quantity, is likely to be contaminated. Combustion of contaminated wood has been shown to generate high levels of emissions of dioxins and furans. These dioxins and furans are also associated with the soot's and chars which deposit in the combustion flue gas system or open fire chimney. Such soot deposits contaminated with dioxins and furans represent substantial environmental and health risks. However, there is very little known about the formation of dioxins and furans in the soot deposits from waste wood combustion.The aim of this present research proposal is to investigate the formation of dioxins and furans formed in the soot deposits from the combustion of biomass under the conditions simulating those of the flue duct conditions from domestic wood burning. The research will investigate how the different structure and surface chemistry of soot's produced from the main biomass components of cellulose, hemicellulose and lignin influence the formation of dioxins and furans under precursor and de novo formation conditions. In addition, soot produced from the combustion of a range of contaminated urban waste woods produced under various operational conditions will be investigated in terms of dioxin and furan formation. An integral study using model biomass aromatic and oxygenated model compounds will aid a mechanistic interpretation of the formation of dioxins and furans related to biomass components and biomass.This research is timely and important in understanding the formation mechanisms of dioxins and furans in the soot deposits from biomass combustion. It also provides critical evidence for policy formulation, recommendations and risk assessments of the potential hazards to human health and the environment of the accumulation of PCDD/PCDF and PCBs in the domestic environment.This is an ambitious proposal involving ultra-trace level organic micro-pollutants using advanced analytical techniques to fundamentally understand the important precursor and de novo reaction mechanisms which lead to the formation of dioxins and furans from biomass combustion