Environmental Sanitation Engineering ›› 2025, Vol. 33 ›› Issue (1): 103-109.doi: 10.19841/j.cnki.hjwsgc.2025.01.014

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Preliminary Exploration for MSWI Fly Ash by the Detoxification Processes of Acid Washing Reduction and Low Temperature Pyrolysis

LIU Zixing, WANG Yanming, WANG Shihao, NIE Jianwen, XUE Xiao, GAO Bin   

  1. 1.Shanghai Municipal Engineering Design Institute (Group) Co. Ltd.; 2. Shanghai Laogang Solid Waste Comprehensive Development Co. Ltd.
  • Online:2025-03-04 Published:2025-03-04

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Abstract: Taking fly ash of a MSWI plant in Shanghai as an example, the effectiveness of an acid-washing and pyrolysis combined approach for fly ash detoxification was explored. It focused on influence in the leaching toxicity of heavy metals, chemical composition, and crystalline phase composition of MSWI fly ash before and after water washing and acid washing. Additionally, the study assessed the pollution characteristics of the wastewater generated from the acid washing process and the fly ash generated from the pyrolysis process. The results showed that after treated by water washing, the leaching toxicity of heavy metals in MSWI fly ash could meet the standard requirements of the HJ 1134—2020 Technical Specification for Pollution Control of Fly-Ash from Municipal Solid Waste Incineration. However, the leaching toxicity had fell short of meeting the standards of the GB 5085.3—2007 Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity. Upon implementing acid washing treatment, the leaching toxicity of heavy metals in MSWI fly ash met the requirements of both standards. In addition, the technical feasibility of this combined system, which consists of acid-water washing and low-temperature pyrolysis, was demonstrated. The heavy metals, dioxins, and soluble chlorine,all met the pollution control requirements of HJ 1134—2020， demonstrating successful detoxification of the MSWI fly ash.

Key words: MSWI fly ash, acid washing, low-temperature pyrolysis, reduction, detoxification

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