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<p>Elevated phosphorus concentrations can damage water bodies. For this reason, phosphorus is usually precipitated with iron salts in wastewater treatment plants. Currently, more efficient methods for phosphorus separation and recovery are being sought in order to comply with the German Sewage Sludge Ordinance of 2017, which is scheduled to be fully implemented by 2029. To find an optimised method, products formed during precipitation in sewage sludge are being investigated using ⁵⁷Fe Mössbauer spectroscopy. As part of this study, samples of activated sludge (AS), return sludge (RS), excess sludge (ES) and digested sludge (DS) were taken and analysed at 77&#xa0;K. The results indicated that the sludge present in AS, RS and ES likely contain a variety of elements in addition to phosphate and iron. The DS data indicate a reduction of iron in the sludge, due to anaerobic chemical and/or microbiologically active conditions in the DS, which probably leads to the formation of vivianite-like structures.</p>

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Mössbauer spectroscopy of iron phosphates with relevance to phosphorus recovery from sewage sludge

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月20日

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  • Paul Hausbrandt,
  • Hannah Akhtar,
  • Marco A. M. Tummeley,
  • Linda K. Müller,
  • Juliusz A. Wolny,
  • Heidrun Steinmetz,
  • Volker Schünemann

摘要

Elevated phosphorus concentrations can damage water bodies. For this reason, phosphorus is usually precipitated with iron salts in wastewater treatment plants. Currently, more efficient methods for phosphorus separation and recovery are being sought in order to comply with the German Sewage Sludge Ordinance of 2017, which is scheduled to be fully implemented by 2029. To find an optimised method, products formed during precipitation in sewage sludge are being investigated using ⁵⁷Fe Mössbauer spectroscopy. As part of this study, samples of activated sludge (AS), return sludge (RS), excess sludge (ES) and digested sludge (DS) were taken and analysed at 77 K. The results indicated that the sludge present in AS, RS and ES likely contain a variety of elements in addition to phosphate and iron. The DS data indicate a reduction of iron in the sludge, due to anaerobic chemical and/or microbiologically active conditions in the DS, which probably leads to the formation of vivianite-like structures.