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Research Progress on Dioxin Prevention and Control Technologies inthe Entire Process of Domestic Waste Incineration

Received Date:2024-05-29 Revised Date:2024-07-08 Accepted Date:2024-07-10

DOI:10.20078/j.eep.20240801

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    Abstract:The prevention and control of dioxin formation during domestic waste incineration plays acrucial role in the harmless di... Open+
    Abstract:

    The prevention and control of dioxin formation during domestic waste incineration plays acrucial role in the harmless disposal of solid waste. This paper systematically summarizes threemechanisms of dioxin formation during the entire incineration process under high-temperature and low-temperature conditions: high-temperature homogeneous synthesis, precursor synthesis, and de novosynthesis, identifying chlorine sources, carbon sources, metals, oxygen, and temperature as keyinfluencing factors. This study focuses on three main stages of domestic waste management, includingEnergy Environmental Protectioncollection, incineration, and waste disposal, and elaborates on various dioxin reduction technologiesapplicable to each stage, including waste source blending and conditioning, pollution control duringincineration, and end-of-pipe treatment of flue gas and fly ash. The fundamental principles and simpleoperational methods of each technology are elucidated, and strategies for dioxin prevention throughoutthe entire domestic waste incineration process are proposed. By screening incoming waste and co-combustion with selected industrial solid waste, the contents of chlorine sources and metals can bereduced, while improving the calorific value, thus reducing dioxin formation at the source. Products ofincomplete combustion from domestic waste can generate dioxins through precursor synthesis.Optimizing "3T+E" (Temperature, Time, Turbulence, and Excess-Air) combustion conditions canminimize the generation of products of incomplete combustion, thereby preventing dioxin formationduring incineration. The use of inhibitors can control dioxin formation through three mechanisms:passivating reactive metals, consuming chlorine sources, and inhibiting precursor synthesis. Currently,common types of inhibitors include sulfur- and nitrogen-based inhibitors, phosphorus-based inhibitors,and alkaline inhibitors. Dioxins generated during incineration primarily exist in flue gas and fly ash.Various technologies have been developed to adsorb and degrade dioxins in flue gas, preventing themfrom entering the atmosphere and posing threats to the ecological environment and human health.Activated carbon technology has proven effective in adsorbing dioxins from flue gas. Catalyticdegradation technology is an important method for treating dioxins in flue gas, as it not only destroysdioxin structures but also enables the synergistic removal of other pollutants, for example, selectivecatalytic reduction (SCR) technology can simultaneously remove dioxins and NO. Commonly useddioxin catalysts can be classified into transition metal oxide catalysts and noble metal catalysts. Somedioxins accumulate in fly ash, and thermal treatment technologies such as co-processing in cementkilns, microwave heating, and hydrothermal treatment can effectively decompose dioxins at hightemperatures, achieving efficient removal of dioxins from fly ash. This paper provides a systematiccomparison and summary of the advantages, disadvantages, and technological maturity of theaforementioned dioxin prevention and control technologies across different processes. Furthermore,current research challenges and future research directions are proposed, providing a reference for thedevelopment and industrial application of dioxin control technologies in the incineration process.

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    Authors:

    • MA Yongyi1,2
    • LI Qianqian1,2
    • SUN Bohua1,2
    • MENG Jing1,2
    • SHI Bin1,2
    • SUN Yangzhao3,*
    • SU Guijin1,2,*

    Units

    • 1. Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    • 2. University of Chinese Academy of Sciences, Beijing 100049, China
    • 3. Foreign Environmental CooperationCenter, Ministry of Ecology and Environment, Beijing 100035, China

    Keywords

    • Domestic waste incineration
    • Dioxin prevention and control
    • Generation mechanisms
    • Entire process control
    • Flue gas treatment

    Citation

    MA Yongyi, LI Qianqian , SUN Bohua , et al. Research Progress on Dioxin Prevention and Control Technologies in the Entire Process of Domestic Waste Incineration[J]. Energy Environmental Protection,2025, 39(2): 44−55.

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