Phosphorus (P) is an essential and limited nutrient element for all life. The recovery and reuse of P from municipal sewage sludge (MSS) incineration fly ash are considered to be practical and economical. Addition of biomass into MSS was proposed to enhance the P bioavailability during incineration. The speciation conversion of P during MSS incineration with different types of biomass was studied in this work. The chemical reactions between P-containing model compound (AlPO₄) and mineral model compounds in biomass (CaO and KCl) were investigated to simulate the conversion mechanism of nonapatite inorganic phosphorus (NAIP) to apatite phosphorus (AP) during MSS incineration with biomass. It is shown that the addition of biomass increases the P mass percentage and facilitates the transformation of NAIP to AP in fly ash. Cotton stalk has the most positive effect on the P transformation in the four biomass samples. Ca, Cl, K, and/or Mg compounds in biomass promote the conversion of NAIP (such as AlPO₄) to AP (such as Ca₂P₂O₇, Ca₅(PO₄)₃Cl, and Ca₁₀K(PO₄)₇) during MSS incineration. Higher temperature stimulates the transformation of NAIP to stable AP. The primary reaction pathway between phosphorus and the main components in biomass is revealed. AlPO₄ can react with CaO to form Ca₂P₂O₇ and Ca₃(PO₄)₂ at 900 °C, and two new P-containing compounds, Ca₅(PO₄)₃Cl and Ca₁₀K(PO₄)₇, are formed in the presence of KCl.

中文翻译：

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从城市污泥焚化过程中利用生物质进行磷转化：具有高生物利用度的磷灰石磷的形成

磷（P）是所有生命必不可少的营养元素。从市政污水污泥（MSS）焚烧飞灰中回收和再利用磷被认为是实用且经济的。建议将生物质添加到MSS中以提高焚烧过程中P的生物利用度。在这项工作中，研究了MSS焚烧过程中不同类型生物质中磷的形态转化。含P的模型化合物（AlPO ₄）和生物质中的矿物模型化合物（CaO和KCl）进行了研究，以模拟生物质MSS焚烧过程中非磷灰石无机磷（NAIP）向磷灰石磷（AP）的转化机理。结果表明，添加生物质提高了粉煤灰中磷的质量百分率，并促进了NAIP向AP的转化。棉秆对四种生物量样品中的磷转化具有最积极的影响。生物质中的Ca，Cl，K和/或Mg化合物会促进NAIP（例如AlPO ₄）向AP（例如Ca ₂ P ₂ O ₇，Ca ₅（PO ₄）₃ Cl和Ca ₁₀ K（ PO ₄）₇）在MSS焚化过程中。较高的温度刺激了NAIP向稳定AP的转化。揭示了磷与生物质中主要成分之间的主要反应途径。AlPO ₄可以在900°C下与CaO反应形成Ca ₂ P ₂ O ₇和Ca ₃（PO ₄）₂，以及两种新的含P化合物Ca ₅（PO ₄）₃ Cl和Ca ₁₀ K（PO _4））₇，是在氯化钾存在下形成的。