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Effective adsorption of phosphate from wastewaters by big composite pellets made of reduced steel slag and iron ore concentrate

机译:还原的钢渣和铁精矿制成的大型复合颗粒有效吸附废水中的磷酸盐

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摘要

In order to remove phosphate from wastewater, a large plastic adsorption column filled with big phosphate-adsorbing pellets with diameters of 10mm, heated by electromagnetic induction coils, was conceived. It was found that the prepared big pellets, which were made of reduced steel slag and iron ore concentrate, contain magnetic Fe and Fe3O4. The thermodynamics and kinetics of adsorption of phosphate from synthetic wastewaters on the pellets were studied in this work. The phosphate adsorption on the pellets followed three models of Freundlich, Langmuir and Dubinin-Kaganer-Radushkevick. The maximum phosphate adsorption capacity Q(max) of the pellets were 2.46, 2.74 and 2.77mg/g for the three temperatures of 20 degrees C, 30 degrees C and 40 degrees C, respectively, based on the Langmuir model. The apparent adsorption energies were -12.9kJ/mol for the three temperatures. It implied that ion exchange was the main mechanism involved in the adsorption processes. The adsorbed phosphate existed on the pellet surface mainly in the form of Fe-3(PO4)(2). A reduction pre-treatment of the pellet precursor with H-2 greatly enhanced pellet adsorption for phosphate. The adsorption kinetics is better represented by a pseudo-first-order model. The adsorbed phosphate amounts were similar for both real and synthetic wastewaters under similar adsorption conditions. The percentage of adsorbed phosphate for a real wastewater increased with increasing pellet concentration and reached 99.2% at a pellet concentration of 64 (g/L). Some specific phosphate adsorption mechanisms for the pellets were revealed and the pellets showed the potential to efficiently adsorb phosphate from a huge amount of real wastewaters in an industrial scale.
机译:为了去除废水中的磷酸盐,设想了一个大型塑料吸附塔,其中装有直径为10mm的大磷酸盐吸附颗粒,并通过电磁感应线圈加热。发现由还原的钢渣和铁矿石精矿制成的制备的大颗粒含有磁性的Fe和Fe 3 O 4。在这项工作中,研究了从合成废水中沉淀颗粒吸附磷酸盐的热力学和动力学。颗粒上的磷酸盐吸附遵循Freundlich,Langmuir和Dubinin-Kaganer-Radushkevick的三种模型。根据Langmuir模型,在20摄氏度,30摄氏度和40摄氏度这三个温度下,颗粒的最大磷酸盐吸附容量Q(max)分别为2.46、2.74和2.77mg / g。在这三个温度下,表观吸附能为-12.9kJ / mol。这表明离子交换是吸附过程的主要机理。吸附的磷酸盐主要以Fe-3(PO4)(2)的形式存在于颗粒表面。用H-2还原颗粒前体的预处理大大增强了颗粒对磷酸盐的吸附。吸附动力学可以用拟一阶模型更好地表示。在相似的吸附条件下,实际废水和合成废水的磷酸盐吸附量相似。实际废水中吸附的磷酸盐百分比随颗粒浓度的增加而增加,在颗粒浓度为64(g / L)时达到99.2%。揭示了颗粒对磷酸盐的一些特定吸附机理,并且颗粒在工业规模中显示出从大量真实废水中有效吸附磷酸盐的潜力。

著录项

  • 来源
    《Environmental Technology》 |2015年第24期|2835-2846|共12页
  • 作者单位

    Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China|Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China|Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China|Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China|Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China|Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phosphate adsorption; big composite pellets; reduced steel slag and iron ore concentrate; thermodynamic and kinetics; adsorption mechanisms;

    机译:磷酸盐的吸附;大的复合颗粒;还原的钢渣和铁矿石精矿;热力学和动力学;吸附机理;

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