TY - JOUR AU - Chen, Weifang AU - Wang, Yegui AU - Hu, Minzhu AU - Li, Yonglun AU - Fang, Guilin PY - 2022/11/18 Y2 - 2024/03/29 TI - Controlling reactions during heavy metal leaching from municipal solid waste incineration fly ash: Scientific paper JF - Journal of the Serbian Chemical Society JA - J. Serb. Chem. Soc. VL - 88 IS - 1 SE - Environmental Chemistry DO - 10.2298/JSC220505065C UR - https://www.shd-pub.org.rs/index.php/JSCS/article/view/11831 SP - 83-95 AB - <p>This research aimed to characterize the physical and chemical pro­perties of municipal solid waste (MSW) incineration fly ash, as well as to investigate the leaching of heavy metals during toxicity characteristics leaching procedure (TCLP) process. To understand the leaching behaviour, concen­trat­ions of heavy metals, chloride, sulphate and calcium at various leaching, time was monitored together with pH of the leaching solution. Results showed that the chemical compositions of fly ashes led to differences in leaching environ­ment. For the two fly ashes under study, one resulted in a leaching environment with pH of 10–12 while the other had pH about 6–7. Based on pH, anions and cations concentrations, Minteq software was employed to investigate the speci­ation of heavy metals. Results showed that the shift in precipitation/dissolution balance of carbonate and hydroxides of heavy metals could explain the fluctu­ation in metal concentrations during the leaching process, which indicates that leaching was probably controlled by these reactions. On the other hand, addit­ion of EDTA changed the controlling reactions. Chelating reactions between heavy metals and EDTA led to much higher leaching toxicity due to the pre­sence of heavy metals, showing that the presence of chelating organics in nat­ural environment may facilitate heavy metal leaching.</p> ER -