城市生活垃圾氯含量测定方法的研究

STUDY ON DETERMINATION METHODS FOR CHLORINE CONTENT IN MUNICIPAL SOLID WASTE (MSW)

为了明确垃圾焚烧中氯的确切来源和种类 ,为垃圾焚烧炉的设计、运行提供参考和促进垃圾焚烧过程中二口恶英类物质等二次污染物的生成机理和控制措施的研究 ,采用硝酸银容量法、硫氰酸汞分光光度法和离子色谱法等研究了城市生活垃圾各主要成分中氯元素的含量。实验结果表明 ,PVC类塑料和厨余中的灰尘部分含氯量相对较高 ,均在 10 0mg/g以上 ;当含氯量大于 10 0mg/g时 ,可以采用硝酸银容量法测定 ;含氯量为 0 1mg/g～ 10mg/g时可以采用硫氰酸汞分光光度法和离子色谱法 ;当含氯量小于 0 1mg/g时则只能采用离子色谱法 ;组分中含硫时只能用离子色谱法测定。

To make origins and kinds of chlorine from MSW clear, to offer reference for design and operation of waste incinerators and to strengthen the study of secondary pollutants like dioxins in their formation mechanism and control method, chlorine contents of the representative composition of MSW are quantitatively analyzed using silver nitride volumetric analysis (SNVA)method, mercury thiocyanate spectrophotometric (MTS) method and ion chromatography (IC) method etc.. The results indicated that chlorine contents are relatively higher for PVC plastics and dust from kitchen wastes, above 100?mg/g generally.SNVA method is available for high-chlorine composition(above 100?mg/g), MTS and IC method act equally with chlorine contents ranging from 0.1 to 10?mg/g and only IC method can be employed when chlorine contents are below 0.1?mg/g and when slulfur is contained.