Yang Nianwei, Wang Tianxing, Zhu Wenyi, Liu Yunqing
Key Laboratory of Pollutant Chemistry and Environmental Treatment, School of Resources and Environment, Yili Normal University, Yining, People's Republic of China.
Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources, Yili Normal University, Yining, People's Republic of China.
J Air Waste Manag Assoc. 2025 Sep;75(9):706-718. doi: 10.1080/10962247.2025.2505074. Epub 2025 Jul 15.
The incineration of municipal solid waste generates a significant amount of MSWIFA, which poses environmental risks due to its high chlorine and lead content, hindering its resourceful utilization. Firstly, water washing is used to remove chlorine and heavy metals from the MSWIFA, followed by a combination of CO aeration and acid leaching to recover lead from the aqueous leachate and purify the lead in the CO precipitate. According to the research results, the MSWIFA from waste incineration was pre-treated with a single water washing at 500 r/min with a liquid-to-solid ratio of 5 for 10 min. It was found in the experiment that when the MSWIFA leachate was aerated with CO at a flow rate of 100 mL/min for 60 min, the recovery rate of lead ions reached 81.77%. Furthermore, when the CO precipitate was leached with 1.5 mol/L hydrochloric acid, only 0.53% of calcium ions remained un-leached in the precipitate phase, while the lead ions retained reached 70.01%, significantly improving the purity of lead ions in the CO precipitate.: Municipal solid waste incineration fly ash (MSWIFA) contains high chlorine and lead, limiting its reuse. This study combined water washing (5:1 liquid-solid ratio, 500 rpm, 10 min) with CO aeration (100 mL/min, 60 min) and acid leaching (1.5 mol/L HCl) to remove Cl and recover Pb. CO aeration achieved 81.77% Pb recovery, while HCl leaching retained 70.01% Pb in the precipitate, reducing Ca residue to 0.53%. The process effectively purified Pb in the CO precipitate, enabling safer MSWIFA utilization. Through this research, it is possible to make effective use of resources and use waste. In line with the current concept of environmental protection.
城市固体废弃物焚烧会产生大量的城市固体废弃物焚烧飞灰（MSWIFA），由于其高氯和高铅含量，会带来环境风险，阻碍其资源化利用。首先，采用水洗法去除MSWIFA中的氯和重金属，然后结合CO曝气和酸浸从浸出液中回收铅，并净化CO沉淀物中的铅。根据研究结果，对垃圾焚烧产生的MSWIFA进行预处理，在500转/分钟的转速下以液固比5进行单次水洗10分钟。实验发现，当MSWIFA浸出液以100毫升/分钟的流速用CO曝气60分钟时，铅离子的回收率达到81.77%。此外，当用1.5摩尔/升盐酸浸提CO沉淀物时，沉淀物相中只有0.53%的钙离子未被浸出，而保留的铅离子达到70.01%，显著提高了CO沉淀物中铅离子的纯度。：城市固体废弃物焚烧飞灰（MSWIFA）含高氯和铅，限制了其再利用。本研究将水洗（液固比5:1，500转/分钟，10分钟）与CO曝气（100毫升/分钟，60分钟）和酸浸（1.5摩尔/升HCl）相结合，以去除氯并回收铅。CO曝气实现了81.77%的铅回收率，而HCl浸提使沉淀物中保留了70.01%的铅，将钙残留量降低到0.53%。该工艺有效净化了CO沉淀物中的铅，使MSWIFA能够更安全地利用。通过这项研究，有可能有效利用资源并变废为宝。符合当前的环保理念。
