College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Bioresour Technol. 2017 Dec;245(Pt A):182-187. doi: 10.1016/j.biortech.2017.08.114. Epub 2017 Aug 20.
In this study, the effect of feedwater pH (3-11) on phosphorus (P) transformation during the hydrothermal carbonization (HTC) of sewage sludge (SS) was investigated at a temperature range of 200-260°C. The HTC significantly accumulated P in the hydrochar. Different feedwater pH stimulated the transformation of various forms of P. An acidic feedwater pH promoted the transformation of apatite phosphorus (AP) to non-apatite inorganic phosphorus (NAIP), and of organic P (OP) to inorganic P (IP). The NAIP tended to transformation to AP and a small part of the IP was transformed to OP when the SS was treated in a basic environment. The combination of three P analysis methods (chemical extractive fractionation, X-ray powder diffraction (XRD) and energy dispersive spectroscopy (EDS)) showed that metal cations (e.g. Al and Ca) and the pH played important roles in the transformation of different forms of P during the HTC of the SS.
在这项研究中，研究了温度范围为 200-260°C 时，不同进水 pH 值（3-11）对污水污泥水热碳化过程中磷转化的影响。水热碳化过程显著地将磷富集到水热炭中。不同的进水 pH 值刺激了各种形式磷的转化。酸性进水 pH 值促进了磷灰石磷（AP）向非磷灰石无机磷（NAIP）的转化，以及有机磷（OP）向无机磷（IP）的转化。当 SS 在碱性环境中处理时，NAIP 倾向于向 AP 转化，而一部分 IP 则转化为 OP。三种磷分析方法（化学提取分级、X 射线粉末衍射（XRD）和能谱（EDS））的结合表明，金属阳离子（如 Al 和 Ca）和 pH 值在 SS 水热碳化过程中不同形式磷的转化中起着重要作用。
