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Utilization of contaminated air pollution control residues generated from sewage sludge incinerator for the preparation of alkali-activated materials
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-20 , DOI: 10.1016/j.resconrec.2022.106665
Keke Sun, Hafiz Asad Ali, Weiyi Ji, Jiaxing Ban, Chi Sun Poon

The air pollution control (APC) residues from the sewage sludge incinerators are harmful to the environment due to their relatively rich soluble salts and heavy metal content. In this paper, the APC residues were pre-treated by water washing at the different liquid to solid ratios (L/S), and a ternary contour diagram was introduced to optimize the composition of slag, waste glass powders and APC residues in alkali-activated materials (AAMs). The result showed that the washing method could remove sulfate of APC residues, while the heavy metals and chloride required a higher L/S ratio to achieve a higher removal rate. Incorporation of the APC residues reduced the compressive strength of AAMs mortar, but the AAMs prepared with the washed APC residues showed a higher compressive strength than the unwashed APC residues. The sulfate from the unwashed APC residues can be used as an activator to improve the drying shrinkage of the AAMs due to the formation of ettringite, while the washed APC residues can be used as a precursor of the AAMs due to the rich aluminosilicate content. The leaching test results indicated that up to 30% washed APC residues incorporated into AAMs showed little leaching of heavy metals. On the contrary, when more than 10% unwashed APC residues are used, the pre-treatment is necessary before they can be utilized for preparing AAMs due to the leaching of heavy metals.



中文翻译:

利用污泥焚烧炉产生的污染空气污染控制残渣制备碱活性材料

污泥焚烧炉产生的空气污染控制 (APC) 残留物因其相对丰富的可溶性盐和重金属含量而对环境有害。本文采用不同液固比(L/S)水洗对APC残渣进行预处理,并引入三元等值线图优化碱液中渣、废玻璃粉和APC残渣的组成。活性材料(AAM)。结果表明,洗涤法可以去除APC残留物中的硫酸盐,而重金属和氯化物则需要较高的L/S比才能达到较高的去除率。APC 残留物的加入降低了AAM 砂浆抗压强度,但用洗涤过的 APC 残留物制备的 AAM 显示出比未洗涤的 APC 残留物更高的抗压强度。由于钙矾石的形成,来自未洗涤的 APC 残留物的硫酸盐可用作活化剂以改善 AAM 的干燥收缩,而洗涤的 APC 残留物由于富含铝硅酸盐含量,可用作 AAM 的前体。浸出测试结果表明,高达 30% 的洗涤 APC 残留物并入 AAM 中,几乎没有重金属浸出。相反,当使用超过 10% 的未洗涤 APC 残留物时,由于重金属的浸出,必须进行预处理才能用于制备 AAM。

更新日期:2022-09-20
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