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Recovery of aluminum from water treatment sludge for phosphorus removal by combined calcination and extraction
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-07-27 , DOI: 10.1016/j.jiec.2021.07.033
Tuan Van Truong 1 , Diwakar Tiwari 2 , Young Sun Mok 3 , Dong-Jin Kim 1
Affiliation  

Combined calcination (700 °C) and extraction was applied for aluminum recovery from alum sludge (AS) for phosphorus removal. Calcined AS had higher aluminum and lower COD content than the intact and dried AS. Both acid and alkali extraction recovered more than 90% of the aluminum in the intact and the pretreated AS. Alkali extract of the AS had less heavy metals and COD contents than the acid extract. Response surface methodology (RSM) of Box–Behnken Design (BBD) was applied to find the optimal condition for phosphorus removal with the recovered aluminum solutions. The aluminum solutions showed that the highest phosphorus removal efficiency was more than 98% at the optimal condition (pH 6.4 and Al/P molar ratio higher than 2) with the extract from the calcined AS. FTIR and XRD analyses confirmed that the recovered precipitate contained AlPO4 and Al(OH)3.



中文翻译:

联合煅烧和萃取从水处理污泥中回收铝用于除磷

结合煅烧 (700 °C) 和萃取用于从铝泥 (AS) 中回收铝以去除磷。与完整和干燥的 AS 相比,煅烧 AS 具有更高的铝和更低的 COD 含量。酸和碱提取均回收了完整和预处理 AS 中 90% 以上的铝。AS的碱提取物的重金属和COD含量低于酸提取物。应用 Box-Behnken 设计 (BBD) 的响应面方法 (RSM) 来寻找用回收的铝溶液去除磷的最佳条件。铝溶液表明,在最佳条件下(pH 6.4 和 Al/P 摩尔比高于 2),使用煅烧 AS 提取物的最高除磷效率超过 98%。FTIR 和 XRD 分析证实回收的沉淀物含有 AlPO4和 Al(OH) 3

更新日期:2021-09-04
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