生活垃圾/废PCB板协同焚烧炉渣中氯的存在特性及影响机制

石宏杰; 沈东升; 龙於洋; 古佛全

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (8) : 4407-4414.

固体废物

生活垃圾/废PCB板协同焚烧炉渣中氯的存在特性及影响机制

石宏杰, 沈东升, 龙於洋, 古佛全

作者信息 +

Characteristics and influence mechanisms of chlorine existence in municipal solid waste/waste PCB co-incineration bottom slag

SHI Hong-jie, SHEN Dong-sheng, LONG Yu-yang, GU Fo-quan

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文章历史 +

摘要

生活垃圾与一般工业固废协同焚烧处理是生活垃圾焚烧产业发展的重要趋势,协同焚烧处理对炉渣中氯存在特性的影响,尚无相关报道.本文以典型的一般工业固废PCB板为实验对象,聚焦生活垃圾/废PCB板协同焚烧过程,查明不同垃圾组分下,焚烧炉渣样品中的氯迁移行为、存在形态及长期稳定性.结果表明,废PCB板高温分解出的玻璃纤维比表面积大,能捕获部分挥发性的氯,使得其残留于炉渣中,从而造成炉渣总氯含量提高,但垃圾组分中塑料占比对该过程有重要影响.协同焚烧的炉渣水溶性氯含量在50~70wt%之间.淋溶结果显示大部分炉渣中氯的残留率在40%以下,而随着废PCB板投加量增加,炉渣中氯的残留率回升,最高达45.6%,这表明协同焚烧抑制了炉渣中氯的浸出.

Abstract

The co-incineration of municipal solid waste (MSW) with general industrial solid waste is recognized as a crucial development trend in the waste incineration industry. However, the impact of co-incineration on chlorine distribution within incineration slag remains poorly understood. This study, using a typical industrial printed circuit board (PCB) as the experimental material, investigates the co-incineration process of MSW and waste PCBs. The migration behavior, chemical forms, and long-term stability of chlorine in slag samples under varying waste compositions were determined. The research examines the migration behavior, chemical forms, and long-term stability of chlorine in slag samples under varying waste compositions. The findings demonstrate that the high-temperature decomposition of glass fibers in waste PCBs results in the retention of volatile chlorine in the slag due to the fibers’ large specific surface area. This leads to an overall increase in total chlorine content within the slag, with the proportion of plastics in the waste mixture significantly influencing this process. The water-soluble chlorine content in the co-incinerated slag samples ranged from 50 to 70wt%. Dynamic leaching results revealed that the residual chlorine rate in most slag samples was below 40%. However, as the proportion of waste PCBs increased, the chlorine residue ratio in the slag rose, peaking at 45.6%. This indicates that co-incineration reduces chlorine leaching from the slag.

导出引用

石宏杰, 沈东升, 龙於洋, 古佛全. 生活垃圾/废PCB板协同焚烧炉渣中氯的存在特性及影响机制[J]. 中国环境科学. 2024, 44(8): 4407-4414

SHI Hong-jie, SHEN Dong-sheng, LONG Yu-yang, GU Fo-quan. Characteristics and influence mechanisms of chlorine existence in municipal solid waste/waste PCB co-incineration bottom slag[J]. China Environmental Science. 2024, 44(8): 4407-4414

中图分类号： X705

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