Potential recovery of phosphorus during the fluidized bed incineration of sewage sludge
Potential recovery of phosphorus during the fluidized bed incineration of sewage sludge
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DOI：
10.1016/j.jclepro.2016.06.177
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发表时间：
2017-01-01
影响因子：
11.1
通讯作者：
Yang, Tianhua
中科院分区：
文献类型：
--
作者：
Li, Rundong;Teng, Wenchao;Yang, Tianhua
磷是一种有限的不可再生资源，是大多数生态系统中生物体生长所不可或缺的营养素。为了研究污泥灰中磷资源的再利用，在中试循环流化床回转窑中进行了试验研究。实验结果表明，高温和氧化钙（CaO）有利于非磷灰石无机磷（NAIP）向磷灰石磷（AP）的转化。采用热重-差示扫描量热分析结合X射线衍射测量方法，模拟污泥焚烧过程中磷酸铝（AlPO 4）与CaO之间的晶相转变，在675-850 ℃温度范围内形成稳定的AP。此外，89.29%的磷富集在污泥底灰中，5.61%分布在飞灰中，AP是850 ℃时飞灰中的主要成分。AP含量一般随粒径的减小而增加，而NAIP含量则表现出相反的趋势，当粒径小于37.5gm时，NAIP含量趋于稳定。(C)2016爱思唯尔有限公司版权所有
Phosphorus is a limited non-renewable resource that is indispensable as an essential nutrient for the growth of organisms in most ecosystems. To demonstrate the reuse of phosphorus resources from sewage sludge ash (SSA), experiments were conducted in a pilot circulating fluidized bed kiln. The experimental results demonstrated that high temperature and calcium oxide (CaO) were beneficial for the transformation of non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP). Thermogravimetric differential scanning calorimetry analysis was combined with X-ray diffraction measurements to simulate the process of sewage sludge incineration of the crystal phase transition between aluminium phosphate (AlPO4) and CaO, forming stable AP in the temperature range of 675-850 degrees C. Additionally, 89.29% of the phosphorus was enriched in sewage sludge bottom ash and 5.61% was distributed in fly ash, with AP being the primary component in the fly ash at 850 degrees C. AP content generally increased with decreasing particle size, whereas NAIP content exhibited the opposite tendency, and became stable when the particle size was less than 37.5 gm. (C) 2016 Elsevier Ltd. All rights reserved.