Li Jingwei, Jia Aiguang, Hou Xiangshan, Wang Xujiang, Mao Yanpeng, Wang Wenlong
Shandong Engineering Laboratory for Solid Waste Green Materials, National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, 250014, China.
Shandong Engineering Laboratory for Solid Waste Green Materials, National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, 250014, China.
J Environ Manage. 2023 Mar 1;329:117090. doi: 10.1016/j.jenvman.2022.117090. Epub 2022 Dec 28.
Harmless disposal and resource utilization of hazardous industrial wastes has become an important issue with the green development of human society. However, resource utilization of hazardous solid wastes, such as the production of cementitious materials, is usually accompanied by a pretreatment process to remove adverse impurities that contaminate the final product. In this study, aluminum dross (AD) was thermally co-treated with another hazardous waste, municipal solid incineration fly ash (MSWI-FA), to synergistically solidify F and Na, control leaching of heavy metals, and remove chloride impurities. Significant crusting was observed when AD was thermally treated by itself, but not when AD and MSWI-FA were thermally co-treated. In the process of co-thermal treatment, the remaining Cl, Na, and K contents were reduced to as low as 0.3%, 1.8%, and 0.6%, respectively. CaO and SiO in MSWI-FA reacted with NaAlF and AlO in AD, and formed CaF and Na(AlSiO), which contributed to the prevention of crusting and limited the leaching concentrations of F and Na to below detection thresholds and 270.6 mg/L, respectively. In addition, heavy metals were well solidified, and dioxins were fully decomposed during thermal treatment. Finally, a sulfoaluminate cementitious material (SACM) with high early- and later-age strengths was successfully created via synergetic complementarity using thermally co-treated AD and MSWI-FA together with other solid wastes. Collectively, this study outlines a promising method for the efficient and sustainable utilization of AD and MSWI-FA.
随着人类社会的绿色发展，危险工业废物的无害化处置和资源利用已成为一个重要问题。然而，危险固体废物的资源利用，如胶凝材料的生产，通常伴随着预处理过程以去除污染最终产品的有害杂质。在本研究中，铝灰（AD）与另一种危险废物城市固体焚烧飞灰（MSWI-FA）进行热协同处理，以协同固化氟和钠，控制重金属的浸出，并去除氯杂质。单独对AD进行热处理时观察到明显的结壳现象，但AD和MSWI-FA进行热协同处理时则未出现。在热协同处理过程中，剩余的氯、钠和钾含量分别降至低至0.3%、1.8%和0.6%。MSWI-FA中的CaO和SiO与AD中的NaAlF和AlO反应，形成CaF和Na(AlSiO)，这有助于防止结壳，并将氟和钠的浸出浓度分别限制在检测阈值以下和270.6 mg/L以下。此外，重金属得到了很好的固化，二恶英在热处理过程中被完全分解。最后，通过将热协同处理的AD和MSWI-FA与其他固体废物进行协同互补，成功制备出了具有高早期和后期强度的硫铝酸盐胶凝材料（SACM）。总体而言，本研究概述了一种有效且可持续利用AD和MSWI-FA的有前景的方法。
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