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首页> 外文期刊>Environmental Science & Technology >Sorption of Chromium with Struvite During Phosphorus Recovery
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Sorption of Chromium with Struvite During Phosphorus Recovery

机译：磷回收过程中鸟粪石对铬的吸附

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摘要

Struvite (MgNH_4PO_4·6H_2O; MAP) precipitation is a viable means of phosphorus (P) recovery from animal and human wastes. The behavior of metal contaminants such as chromium (Cr) during struvite precipitation, however, requires consideration. Here the influence of both Cr concentration and oxidation state on sorption is assessed. The Cr content of struvite precipitated in the presence of 1-100 μM Cr as Cr(Ⅲ) (22.3-3030.1 mg/kg) was higher than that of solids from Cr(Ⅵ) (4.5-5.1 mg/kg) solutions. For 1-20 μM Cr(Ⅲ) solids, scanning electron microscopy (SEM) revealed etch pit formation on struvite crystal surfaces, indicative of a surface interaction. The formation of an adsorbate was confirmed by X-ray absorption fine structure spectroscopy (XAFS). At initial concentrations ≥20 μM Cr(Ⅲ), XAFS confirmed the formation of a Cr(OH)_3-nH_2O(am) precipitate. Fourier transform infrared (FT-IR) spectroscopy revealed that both Cr(Ⅲ) and Cr(Ⅵ) sorption resulted in distortion of the PO_4~(3-) tetrahedra in the mineral structure. This, combined with SEM results revealed that even at low sorbed concentrations, the Cr impurity can affect the mineral surface and structure. Thus, the initial Cr concentration and oxidation state in wastes targeted for P recovery will dictate the final Cr content, the mechanism of sorption, and impact on the struvite structure.
机译：鸟粪石（MgNH_4PO_4·6H_2O; MAP）沉淀是从动物和人类废物中回收磷（P）的可行方法。然而，在鸟粪石沉淀期间，诸如铬（Cr）等金属污染物的行为需要考虑。这里评估了铬浓度和氧化态对吸附的影响。在1-100μMCr存在下，作为Cr（Ⅲ）（22.3-3030.1 mg / kg）沉淀的鸟粪石中的Cr含量高于Cr（Ⅵ）（4.5-5.1 mg / kg）溶液中的固体含量。对于1-20μM的Cr（Ⅲ）固体，扫描电子显微镜（SEM）显示在鸟粪石晶体表面上形成了蚀坑，表明存在表面相互作用。通过X射线吸收精细结构光谱法（XAFS）确认了吸附物的形成。在初始浓度≥20μMCr（Ⅲ）时，XAFS证实形成了Cr（OH）_3-nH_2O（am）沉淀。傅立叶变换红外光谱（FT-IR）表明，Cr（Ⅲ）和Cr（Ⅵ）的吸附均导致矿物结构中PO_4〜（3-）四面体的变形。结合SEM结果表明，即使在低吸附浓度下，Cr杂质也会影响矿物的表面和结构。因此，针对磷回收的废物中初始Cr浓度和氧化态将决定最终Cr含量，吸附机理以及对鸟粪石结构的影响。

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  • 来源
    《Environmental Science & Technology》 |2012年第22期|12493-12501|共9页
  • 作者

    Ashaki A. Rouff;

  • 作者单位

    School of Earth and Environmental Sciences, Queens College City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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