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首页> 外文期刊>Journal of environmental sciences >Effect of Ca:Mg ratio and high ammoniacal nitrogen on characteristics of struvite precipitated from waste activated sludge digester effluent
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Effect of Ca:Mg ratio and high ammoniacal nitrogen on characteristics of struvite precipitated from waste activated sludge digester effluent

机译：Ca：Mg比和高氨氮对废物活性污泥流出物沉淀出脱硝盐特性的影响

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This study revealed the relationship between the presence of calcium impurities and ammoniacal nitrogen concentration upon crystallization of struvite. The research hypothesis was that the presence of both calcium and high concentrations of ammoniacal nitrogen (328-1000 mg/L) in waste activated sludge may influence the struvite quality and acid stability. Hence, we studied the impact of Ca:Mg ratio upon morphology, particle size, purity and dissolution of struvite, in the presence of varying levels of excess ammoniacal nitrogen. X-ray diffraction revealed that up to 31.4% amorphous material was made which was assigned to hydroxyapatite. Increasing the ammoniacal nitrogen concentration and elevation of the Mg:Ca ratio maximized the presence of struvite. Struvite particle size was also increased by ammoniacal nitrogen as was twinning of the crystals. Tests with dilute solutions of organic acid revealed the sensitivity of struvite dissolution to the physical characteristics of the struvite. Smaller particles (21.2 mu m) dissolved at higher rates than larger particles (35.86 mu m). However, struvite dissolved rapidly as the pH was further reduced irrespective of the physical characteristics. Therefore, addition of struvite to low pH soils was not viewed as beneficial in terms of controlled nutrient release. Overall, this study revealed that waste activated sludge effluent with high ammoniacal nitrogen was prospective for synthesis of high quality struvite material. (c) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
机译：本研究揭示了钙杂质和氨基氮浓度在斯特勒布结晶后的关系。研究假设是废物活性污泥中钙和高浓度的氨基氮（328-1000mg / L）的存在可能影响稳定质量和酸稳定性。因此，我们研究了Ca：mg比在斯特鲁维的形态，粒度，纯度和溶解情况下的影响，在不同水平的过量氨氮的存在下。 X射线衍射显示，制备高达31.4％的无定形材料，分配给羟基磷灰石。增加MG的氨氮浓度和升高：Ca比最大化了斯特勒维的存在。通过氨氮也增加稳定颗粒尺寸，因为晶体的孪晶是晶体的孪晶。用有机酸稀释溶液试验显示Struvite溶解对斯特鲁维特的物理特性的敏感性。较小的颗粒（21.2μm）溶解在比较大的颗粒更高的速率较高（35.86μm）。然而，无论物理特性如何进一步降低时，速率迅速溶解。因此，在受控营养释放方面，未被视为低于低pH土壤的斯特维矿石。总体而言，该研究表明，具有高氨氮的废物活性污泥流出物是合成高质量的稳定材料的前瞻性。 （c）2019中国科学院生态环境科学研究中心。 elsevier b.v出版。

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