Valorisation of alum sludge to produce green and durable mortar

Waste Disposal & Sustainable Energy Pub Date : 2022-10-15 DOI:10.1007/s42768-022-00113-3

Qiong Jia, Yan Zhuge, Weiwei Duan, Yue Liu, Jing Yang, Osama Youssf, Jinsuo Lu

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引用次数: 8

Abstract

Alum sludge is a typical by-product of drinking water treatment processes. Most sludge is disposed of at landfill sites, and such a disposal method may cause significant environmental concern due to its vast amount. This paper assessed the feasibility of reusing sludge as a supplementary cementitious material, which could efficiently exhaust stockpiled sludge. Specifically, the pozzolanic reactivity of sludge at different temperatures, the reaction mechanism of the sludge–cement binder, and the resistance of sludge-derived mortar to microbially induced corrosion were investigated. The obtained results indicated that 800 °C was the optimal calcination temperature for sludge. Mortar containing sludge up to 30% by weight showed comparable physical properties at a curing age of 90 days. Mortar with 10% cement replaced by sludge can significantly improve the resistance to biogenic corrosion due to the formation of Al-bearing phases with high resistance to acidic media, e.g., Ca₄Al₂O₇·xH₂O and strätlingite.

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明矾污泥的增值生产绿色耐用砂浆

明矾污泥是饮用水处理过程中的典型副产物。大部分污泥是在堆填区弃置，而这种弃置方法由于其数量庞大，可能会引起严重的环境问题。本文评价了污泥作为补充胶凝材料回用的可行性，该材料可以有效地排除库存污泥。具体而言，研究了污泥在不同温度下的火山灰反应性、污泥-水泥粘结剂的反应机理以及污泥砂浆的抗微生物腐蚀性能。结果表明，污泥的最佳焙烧温度为800℃。含有污泥重量30%的砂浆在养护90天时表现出类似的物理性能。以污泥替代10%水泥的砂浆，由于形成了对Ca4Al2O7·xH2O、strätlingite等酸性介质具有较高耐腐蚀性的含al相，可显著提高砂浆的抗生物腐蚀能力。图形抽象

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Waste Disposal & Sustainable Energy

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