Xue Yujie, Lin Xiaochen, Zhang Houhu, Zou Dong, Zhou Jizhi, Zhang Yufeng
School of Environmental Science and Engineering, Nanjing Tech University, No. 30 Puzhunan Road, Jiangsu, 211816, PR China.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing, 210042, PR China.
Heliyon. 2023 Sep 22;9(10):e20301. doi: 10.1016/j.heliyon.2023.e20301. eCollection 2023 Oct.
The leachate sludge (LS) and fly ash (FA) are the foci of hazardous wastes which generated from the municipal solid waste incineration (MSWI). The current work developed a new way to use energy from MSWI process for the on-site sintering of LS and FA at a relatively low temperature. With the assistance of CaF, granule of LS and MSWI FA were co-sintered. The influence of temperature, the mass of CaF, and the mass ratio of LS/MSWI FA were investigated. As a result, heavy metals volatilization and leaching in the form of chlorinated salts were controlled. In addition, CaF improved the compressive strength of the granule under low-temperature sintering. Moreover, the scale-up co-sintering test was achieved in an MSWI chamber. The results showed that the optimum condition was sintering at 973K for 1 h. The compressive strength of sintered product reached 4.25 MPa, which met the standard of ceramic granule. Moreover, with the addition of CaF, the volatilization rate of Pb, Zn, and Cd decreased by 6%, 7%, and 6%, respectively. This method can be a promising technique for the utilization of solid wastes.
渗滤液污泥（LS）和飞灰（FA）是城市固体废物焚烧（MSWI）产生的危险废物重点。当前工作开发了一种利用MSWI过程中的能量在相对低温下对LS和FA进行现场烧结的新方法。在CaF的辅助下，LS颗粒与MSWI飞灰进行了共烧结。研究了温度、CaF质量以及LS/MSWI飞灰质量比的影响。结果，控制了重金属以氯化物盐形式的挥发和浸出。此外，CaF提高了低温烧结颗粒的抗压强度。而且，在MSWI燃烧室中进行了放大共烧结试验。结果表明，最佳条件是在973K烧结1小时。烧结产物的抗压强度达到4.25MPa，符合陶瓷颗粒标准。此外，添加CaF后，Pb、Zn和Cd的挥发率分别降低了6%、7%和6%。该方法对于固体废物的利用可能是一种有前景的技术。
