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首页> 外文期刊>The Science of the Total Environment >Removal of phosphate from aqueous solution by dolomite-modified biochar derived from urban dewatered sewage sludge
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Removal of phosphate from aqueous solution by dolomite-modified biochar derived from urban dewatered sewage sludge

机译：城市污水脱水污泥中白云石改性生物炭去除水溶液中的磷酸盐

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摘要

Excessive phosphorus emission is mainly responsible for eutrophication. Recently, the application of modified biochars for phosphorus removal from aqueous solution has set off a boom. In the present study, a novel modified biochar was developed, from urban sewage sludge by decorating dolomite according to the dried mass ratio of sludge to dolomite being 1:1. The experimental results showed that the adsorption process preferred lower pH, with the biochar under investigation exhibiting high phosphate removal efficiency of 96.8% at the adsorbent dosage of 2.6 g/L and the initial solution pH of 4.5. Moreover, for the tested biochar, the phosphate removal kinetics data at different temperatures were all well fitted by the pseudo-second-order model, thereby establishing the endothermic nature of the adsorption process. Furthermore, the phosphate removal data upon being well fitted by the Langmuir model showed the maximal removal capacity of 29.18 mg/g. Further, for determining the mechanism involved in the removal process, SEM, XRD, and FTIR analysis were carried out, which in turn revealed that the phosphate combines with the biochar via electrostatic attraction, thereby forming a new outer-sphere surface complex and inner-sphere surface complex in the acidic condition. Additionally, the calcium and magnesium precipitation of phosphate may contribute to the removal of phosphate in the adsorption process. The presence of SO42-, HCO3-, and C5H7O5COO- could negatively affect the removal of phosphate, while CH3COO- had a positive effect on the adsorption of phosphate on the biochar. Thus, an economic assessment showed that the proposed adsorption process had a commercial attraction. (C) 2019 Elsevier B.V. All rights reserved.
机译：磷排放过多是造成富营养化的主要原因。近来，改性生物炭用于从水溶液中去除磷的应用掀起了热潮。在本研究中，根据污泥与白云石的干质量比为1：1，通过装饰白云石从城市污水污泥中开发出一种新型的改性生物炭。实验结果表明，吸附过程优选较低的pH值，在2.6 g / L的吸附剂量和4.5的初始溶液pH下，所研究的生物炭显示出96.8％的高磷酸盐去除率。此外，对于所测试的生物炭，在不同温度下的除磷动力学数据均通过拟二阶模型很好地拟合，从而建立了吸附过程的吸热性质。此外，Langmuir模型很好地拟合后的磷酸盐去除数据显示最大去除容量为29.18 mg / g。此外，为确定去除过程涉及的机理，还进行了SEM，XRD和FTIR分析，结果表明，磷酸盐通过静电吸引与生物炭结合，从而形成了新的外层表面复合物和内层酸性条件下的球形表面复合物。另外，磷酸盐的钙和镁沉淀可有助于在吸附过程中除去磷酸盐。 SO42-，HCO3-和C5H7O5COO-的存在可能会对磷酸盐的去除产生负面影响，而CH3COO-对磷酸盐在生物炭上的吸附具有积极作用。因此，经济评估表明，提出的吸附方法具有商业吸引力。 （C）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第15期|460-469|共10页
  • 作者

    Li Jing; Li Bing; Huang Haiming; Lv Xiaomei; Zhao Ning; Guo Guojun; Zhang Dingding;

  • 作者单位

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China|Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China;

    Univ Auckland, Dept Chem & Mat Engn, Auckland, New Zealand;

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China;

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China;

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China|Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China;

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China|Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China;

    Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Peoples R China|Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Biochar; Phosphate; Dolomite; Sludge;

    机译：生物炭;磷;白云岩;污泥;

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