Compaction as a cost-effective strategy to upgrade the disposal of MSWI fly ash:feasibility and potential  

作　　者：Shijin Dai Fafa Xia Bo Yang Deli Wu Dongjie Niu Youcai Zhao Xunchang Fei Zhanbo Cheng Hongping He 

机构地区：[1]Baoan District City Appearance and Environment Comprehensive Management Service Center,Shenzhen 518101,China [2]College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [3]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China [4]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China [5]School of Civil and Environmental Engineering,Nanyang Technological University,Singapore 639798,Singapore

出　　处：《Frontiers of Environmental Science & Engineering》2025年第3期145-158,共14页环境科学与工程前沿(英文)

基　　金：supported by the National Natural Science Foundation of China(No.52100152);the Natural Science Foundation of Shenzhen Science and Technology Commission(China)(No.RCBS20210609103644013);the Stable Support Program of Shenzhen Colleges and Universities(China)(No.20220810172813001);The Foundation of the State Key Laboratory of Pollution Control and Resource Reuse Foundation(Tongji University,China)is also acknowledged(PCRRF20013).

摘　　要：Landfilling remains the primary disposal method for fly ash produced from municipal solid waste incineration(MSWI)following stabilization/solidification.However,the increasing generation of stabilized fly ash(SFA)is accelerating the depletion of landfill capacity.Furthermore,the small particle size and low bulk density of SFA present significant environmental risks during handling and transportation.To mitigate these issues,a cost-effective compaction method was introduced into the SFA disposal process.The results show that SFA from both grate furnaces and fluidized bed incinerators exhibited high porosity,loose structure,and irregular particle morphology,indicating substantial potential for compaction.Key parameters influencing compaction effectiveness included compaction pressure,holding duration,and moisture content,with optimal values identified as 100–200 MPa,20 s,and 10%–15%moisture,respectively,depending on the incinerator type.After compaction treatment,the density of SFA more than doubled,while its volume was reduced by over 60%,significantly increasing landfill capacity and enhancing the efficiency of SFA disposal.The compaction process was effectively modeled using the Huang Peiyun equation for gerate furnace ash and the Heckel equation for fluidized bed ash.Furthermore,the unconfined compressive strength and three-point bending strength of compacted SFA met the MU10 standard for lime-sand bricks,making the material suitable for transportation and disposal.Finally,the compaction-based disposal method for SFA demonstrated clear techno-economic advantages and significant potential for broader application in waste management strategies.

关 键 词：Stabilized fly ash Compaction process Volume reduction Disposal upgrading 

分 类 号：X705[环境科学与工程—环境工程]