New advancement perspectives of chloride additives on enhanced heavy metals removal and phosphorus fixation during thermal processing of sewage sludge
New advancement perspectives of chloride additives on enhanced heavy metals removal and phosphorus fixation during thermal processing of sewage sludge
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氯化物添加剂强化污泥热解重金属固磷的新进展
DOI：
10.1016/j.jclepro.2018.03.276
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发表时间：
2018-07-01
影响因子：
11.1
通讯作者：
Liang, Zhiwu
中科院分区：
文献类型：
--
作者：
Bairq, Zain Ali Saleh;Li, Rundong;Liang, Zhiwu
控制污水污泥焚烧过程中铜（Cu）、锌（Zn）、铅（Pb）和镉（Cd）等重金属的去除以及从污水污泥灰分（SSA）中回收磷（P）仍然具有挑战性。本文旨在研究污水污泥焚烧过程中温度、停留时间和氯化剂添加剂（MgCl2 和 KCl）对选定重金属行为和磷 (P) 固定率的影响。将干燥的污水污泥与不同量的氯化剂混合，并在实验室规模的炉中在800 -1000℃的温度范围内处理不同的停留时间（30、60和120分钟）。结果表明，随着氯化物的添加，重金属的去除效率呈现出增加的趋势，尤其是Cu、Zn和Pb。此外，温度和保留时间对促进重金属去除有显着影响。对于 Pb，在 800 摄氏度下 120 分钟内可去除 96%，而在 1000 摄氏度下可在 30 分钟内有效去除 86.6% 的镉。事实证明，MgCl2 比 KCl 更能有效提高重金属去除效率，添加 15%wt Cl-/污水污泥（SS（，在 960 ℃ 时，氯化镉 CdCl2 和 CdO 的沸点。Al2O3 中心点 2SiO(2) 保留时间和还观察到高温有利于非磷灰石无机磷 (NAIP) 转化为磷灰石磷 (AP)，这种转化对于磷酸盐固定是有效的，这证明磷灰石磷 (AP) 在高温下比非磷灰石无机磷 (NAIP) 更稳定。版权所有。
Controlling the removal of heavy metals such as Copper (Cu), Zinc (Zn), lead (Pb) and cadmium (Cd) during the sewage sludge incineration and the recovery of phosphorus (P) from sewage sludge ash (SSA) remain challenging. Herein we aim to investigate the effect of the temperature, retention time and chlorinating agent additives (MgCl2 and KCl) on both the behavior of selected heavy metals and the fixed rate of phosphorus (P) during sewage sludge incineration. Dry sewage sludge was mixed with various amounts of chlorinating agent and treated by a laboratory scale furnace in the temperature range of 800 -1000 degrees C for different retention times (30, 60 and 120 min). The results demonstrated that the removal efficiency of heavy metals exhibited an increasing tendency with the addition of chloride, especially in the cases of Cu, Zn and Pb. Moreover, the temperature and retention time demonstrated significant effects on the promotion of heavy metals removal. In the case of Pb 96% was removed at 800 degrees C within 120 min, while 86.6% of Cd was effectively removed at 1000 degrees C within 30 min. MgCl2 proved to be more effective than KCl in improving the removal efficiency of heavy metals, such that up to 81.6% of Cu, 84.9% of Pb and 73.5% of Zn was removed with the addition of 15%wt Cl-/sewage sludge (SS(, At 960 degrees C, the boiling point of cadmium chloride CdCl2 and CdO.Al2O3 center dot 2SiO(2) retention time and chlorinating agent had no impact on Cd removal. It was also observed that high temperature was beneficial for the transformation of non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP). At 900 degrees C this transformation is efficient for Phosphate fixation, which is evidence that apatite phosphorus (AP) has the ability to be more stable than non-apatite inorganic phosphorus (NAIP) at high temperature. (C) 2018 Elsevier Ltd. All rights reserved.