Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Waste Manag. 2018 Apr;74:404-412. doi: 10.1016/j.wasman.2018.01.007. Epub 2018 Jan 5.
The potential of six different extractants to recover phosphorus (P) from incinerated sewage sludge ash (ISSA) was evaluated. Secondary effects such as the co-dissolution of Zn and Cu were also considered. The residual ISSA from each study was assessed in particular detail, focusing on the leachability of remaining Zn and Cu, major element composition, crystalline phases and overall degree of crystallinity and particle size distribution. The residual ISSA was also evaluated as a pozzolanic material using a Strength Activity Index (SAI) test with mortars containing Portland cement with a 20% substitution by ISSA. All results were compared to tests with untreated ISSA. Overall, the use of 3 of the 6 extractants could be ruled out due to poor P recovery potential and/or a serious compromise of the potential reuse of residual ISSA in Portland cement-based materials. The results highlight the added value of considering the potential reuse of residual ISSA when trying to optimize P recovery from ISSA by wet methods.
评估了六种不同提取剂从焚烧污水污泥灰（ISSA）中回收磷（P）的潜力。还考虑了锌和铜的共溶解等二次效应。特别详细地评估了每项研究的剩余 ISSA，重点是剩余锌和铜的浸出性、主要元素组成、晶相以及整体结晶度和粒度分布。剩余的 ISSA 也被评估为一种火山灰材料，使用含有波特兰水泥的砂浆进行强度活性指数（SAI）测试，其中 ISSA 替代了 20%的波特兰水泥。所有结果都与未经处理的 ISSA 进行了比较。总体而言，由于磷回收潜力差和/或严重影响剩余 ISSA 在基于波特兰水泥的材料中的潜在再利用，因此可以排除使用 6 种提取剂中的 3 种。这些结果强调了在尝试通过湿法优化从 ISSA 中回收磷时，考虑剩余 ISSA 潜在再利用的附加值。
