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Waste Disposal & Sustainable Energy
Waste Disposal & Sustainable Energy  2020, Vol. 2 Issue (2): 113-125    DOI: 10.1007/s42768-020-00037-w
    
基于定量X射线衍射分析的污泥中磷化合物的浸出行为
Pinjing He1,3, Xiaotong Zhang1,2, Fan Lü2,3, Liming Shao1,3, Hua Zhang1,2,3
1 Institute of Waste Treatment and Reclamation, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China 2 State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China 3 Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis
Pinjing He1,3, Xiaotong Zhang1,2, Fan Lü2,3, Liming Shao1,3, Hua Zhang1,2,3
1 Institute of Waste Treatment and Reclamation, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China  2 State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China 3 Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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摘要： 磷是一种必不可少的资源。焚化污水污泥灰中含有大量的磷，可通过化学浸出法对其进行回收。然而，其回收率取决于磷的形态和浸出条件。本研究使用盐酸作为浸出剂，并研究了盐酸浓度、浸出时间、温度和液固比对磷浸出率的影响。此外还分析了宏观金属钙、铝、铁和镁的共浸出情况。结果表明，磷在30min内迅速浸出，浸出率达到80％以上，然后逐渐达到稳定。钙和镁的浸出浓度具有显着的相关性（相关系数r2>0.90），并且两者都被完全浸出。铝和磷具有相似的浸出模式，其中在0.2mol/L盐酸中的浸出率先升高然后降低。根据X射线衍射分析和后处理得到的结果，焚化污水污泥灰中的磷主要以Mg3Ca3(PO4)4和AlPO4的形式存在。当在55℃条件下，使用0.2mol/L盐酸进行液固比为20L/kg浸出时，焚化污水污泥灰中的AlPO4和Fe3(H2O)3(PO4)2首先溶解，然后沉淀在固相表面上，从而阻止了磷进一步的浸出。
关键词： 污水污泥灰;  酸浸;  磷形态;  定量X射线衍射分析;  后处理    
Abstract: Phosphorus (P) is an essential and limited resource. Incineration sewage sludge ash (ISSA) contains a high amount of P, which can be recovered using chemical leaching methods. However, the recovery ratio depends on the speciation of P and the leaching conditions. In this study, hydrochloric acid was used as a leaching agent, and the effects of the hydrochloric acid concentration, leaching time, temperature, and liquid–solid ratio on the P leaching ratio were investigated. Furthermore, the co-leaching of macro-metals Ca, Al, Fe, and Mg was analyzed. The results showed that P leached rapidly within 30 min, where the leaching rate reached more than 80% and then gradually stabilized. The leaching concentrations of Ca and Mg had a significant correlation (correlation coefficient r2?>?0.90), and both were leached completely. Al and P had similar leaching patterns, where the leaching rates increased initially and then decreased with time at 0.2 mol/L HCl. According to X-ray diffraction analysis and Rietveld refinement, the P in ISSA was mainly present in the forms of Mg3Ca3(PO4)4 and AlPO4. When leached using 0.2 mol/L HCl at 55 °C with a liquid-to-solid ratio of 20 L/kg, the AlPO4 and Fe3(H2O)3(PO4)2 in ISSA dissolved initially and then precipitated on the surface of the solid phase, thereby impeding further P leaching.
Key words: Sewage sludge ash    Acid leaching    Phosphorous speciation    Quantitative X-ray diffraction analysis    Rietveld refinement
收稿日期: 2020-02-14 出版日期: 2020-08-17
通讯作者: Hua Zhang     E-mail: zhanghua_tj@tongji.edu.cn
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引用本文:

Pinjing He, Xiaotong Zhang, Fan Lü, Liming Shao, Hua Zhang. Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis. Waste Disposal & Sustainable Energy, 2020, 2(2): 113-125.

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http://www.zjujournals.com/wdse/CN/10.1007/s42768-020-00037-w    或    http://www.zjujournals.com/wdse/CN/Y2020/V2/I2/113

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