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Transformations of Phosphorus Speciation during (Hydro)thermal Treatments of Animal Manures

机译：（水）热处理动物粪便过程中磷形态的变化

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摘要

Phosphorus (P) in animal manures is an important P pool for P recycling and reclamation. In recent years, thermochemical techniques have gained much interests for effective waste treatment and P recycling. This study comparatively characterized the transformation of P during two representative thermochemical treatments (pyrolysis and hydrothermal carbonization, HTC) of four animal manures (swine, chicken, beef, and dairy manures) by combining nuclear magnetic resonance spectroscopy, X-ray absorption spectroscopy, and sequential extraction. For both pyrolysis and HTC treatments, degradation of organic phosphate and crystallization of Ca phosphate minerals were observed and were highly dependent on treatment temperature. Extensive crystallization of Ca phosphate minerals occurred at temperatures above 450 °C during pyrolysis, compared to the lower temperature (175 and 225 °C) requirements during HTC. As a result, P was immobilized in the hydrochars and high temperature pyrochars, and was extracted primarily by HCl. Because Ca is the dominating P-complexing cation in all four manures, all manures showed similar P speciation and transformation behaviors during the treatments. Results from this work provided deeper insights into the thermochemical processes occurred during the pyrolysis and HTC treatments of biological wastes, as well as guidance for P reclamation and recycling from these wastes.
机译：动物粪便中的磷（P）是磷回收和再生的重要磷库。近年来，热化学技术在有效的废物处理和磷回收方面引起了广泛兴趣。这项研究通过结合核磁共振波谱，X射线吸收光谱法和四种动物粪便（猪，鸡，牛肉和奶牛粪便）的两种代表性热化学处理（热解和水热碳化，HTC）来比较表征P的转化。顺序提取。对于热解和HTC处理，都观察到有机磷酸盐的降解和磷酸钙钙矿物的结晶，并且高度依赖于处理温度。与HTC较低的温度要求（175和225°C）相比，热解期间在450°C以上的温度下会发生磷酸钙矿物的广泛结晶。结果，P被固定在烃和高温焦炭中，并主要用HCl萃取。由于Ca是所有四种肥料中主要的P络合阳离子，因此在处理过程中所有肥料均表现出相似的P形态和转化行为。这项工作的结果提供了对生物废物的热解和HTC处理过程中发生的热化学过程的更深入了解，以及这些废物的P回收和再循环的指南。

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  • 来源
    《Environmental Science & Technology》 |2018年第5期|3016-3026|共11页
  • 作者

    Rixiang Huang; Ci Fang; Bei Zhang; Yuanzhi Tang;

  • 作者单位

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30324-0340, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30324-0340, United States,College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30324-0340, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30324-0340, 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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  • 正文语种 eng
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