城市生活垃圾初期降解挥发性有机物释放特征

Emission of Volatile Organic Compounds During Initial Decomposition Phase of Municipal Solid Waste

摘要:

采用实验模拟方法,研究了城市生活垃圾初期降解阶段的VOCs(挥发性有机物)释放特征.研究结果表明,72 h内垃圾总挥发性有机物(TVOCs)释放率为9.67~20.30 mg·kg-1,其中换气率为24%的工况,释放率最低.TVOCs中酮类物质占70%~80%,硫醚类物质占10%~20%；其中硫醚类物质是主要的致臭组分.TVOCs释放呈前段高、中间低、末段再升高的特征,但形成恶臭的硫醚类却呈单调上升趋势.通风良好的堆积条件会抑制初期降解阶段VOCs的释放,而好氧微生物接种具有控制该阶段生活垃圾VOCs释放

Abstract:

Simulated tests were carried out to investigate the characteristics of the emission of volatile organic compounds(VOCs).The emission rates of total VOCs (TVOCs) were 9.67~20.3 mg·kg-1 in 72 h after municipal solid waste(MSW) generation.The lowest emission rate corresponded to the high-level ventilation condition with the oxygen concentration in the MSW layer around 18%.The ketones and the thioethers accounted for 70%~80% and 10%~20% of TVOCs,respectively,which were the major odorous catalogues.During the period of 72 h,the TVOCs emission was high in 0~24 h,descended in 25~48 h,and rose again in 49~72 h.Contrastively,the emission of thioehters kept ascending during 72 h.The study suggests that the VOCs emission can be reduced by high-level ventilation and inoculation with aerobic microorganisms.