Heavy Metal Behavior and Control in Waste Incineration Systems
Summary
Waste incineration remains a critical component of integrated waste management, offering significant volume reduction and energy recovery. However, the high temperatures and complex chemistry within modern furnaces promote the volatilisation of heavy metals such as lead, cadmium, mercury, chromium and nickel. Once vapour-phase, these metals undergo gas-phase reactions—often chlorination in the presence of halogens—to form volatile metal chlorides, before cooling and condensing onto fine particulate matter. Metal partitioning between bottom ash, fly ash and flue gas is governed by parameters including combustion temperature, waste composition (particularly chlorine, sulphur and organic content), residence time and flue gas composition. Control strategies encompass in-furnace sorbents (activated carbons, mineral clays), temperature and atmosphere control to favour metal retention in solid residues, and post-combustion flue gas cleaning using electrostatic precipitators, fabric filters and wet scrubbers. Additives such as metal oxides or alkali compounds can stabilise metals in ash or promote formation of non-volatile species. Ongoing research seeks to optimise sorbent design, understand speciation dynamics and develop holistic process models to ensure compliance with tightening emission standards while enabling safe reuse or disposal of residual ash.
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Heavy Metal Behavior and Control in Waste Incineration Systems publication trend
The graph below shows the total number of articles in heavy metal behavior and control in waste incineration systems across all publications each year (not limited to Nature Index journals).
Technical terms
Volatilisation: Transition of a metal from solid or liquid phase into the gas phase under high temperature.
Chlorination: Chemical reaction in which metal oxides or hydroxides react with chlorine species to form metal chlorides, typically more volatile.
Sorbent: Material introduced into the combustion or flue gas stream to capture gaseous or particulate pollutants via adsorption or chemical reaction.
Speciation: Distribution of a heavy metal among its various chemical forms or oxidation states, influencing volatility and toxicity.
Particulate control device: Equipment such as electrostatic precipitators or fabric filters that remove fine particles—and associated metals—from flue gas.
References
- High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix. RSC Advances (2018).
- Thermal Destruction of Waste and the Impact of the Presence of Cl and S in Waste on the Emissions of Cu, Ni, and Pb and Their Immobilisation in the Ash Residue. Energies (2023).
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