Heatphos Process for Recovering Phosphorus from Bio-P Sludge Before Anaerobic Digestion

  • Noboru Takiguchi
  • Akio Kuroda
  • Hisao OhtakeEmail author
  • Satoshi Tsuneda


Sewage sludge generated in Bio-P processes (also known as enhanced biological phosphorus removal processes) typically contains 3–5% of its dry weight as phosphorus (P). Approximately 60–80% of the P is stored as polyphosphate (polyP) which is a heat-labile polymer of inorganic phosphate (Pi). This chapter describes a simple technology, named “Heatphos,” for leaching polyP from Bio-P sludge by heating at 70 °C for about 1 h and recovering Pi from the leachate by the addition of CaCl2 without needing to adjust pH to a high value. Heating sludge for polyP leaching can also improve the digestive efficiency and thus biogas productivity in the subsequent anaerobic sludge digestion at both mesophilic (typically 35–40 °C) and thermophilic (50–60 °C) temperatures. The heat energy required for polyP leaching can be supplied from biogas generated by anaerobic sludge digestion. The demonstration plant with a capacity of treating Bio-P sludge of 0.36 m3/day has showed that P could be recovered from Bio-P sludge at a rate of approximately 10 kgP/day (c. 3.5 tP/a).


Polyphosphate Heatphos Bio-P sludge Anaerobic sludge digestion 


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Noboru Takiguchi
    • 1
  • Akio Kuroda
    • 2
  • Hisao Ohtake
    • 3
    Email author
  • Satoshi Tsuneda
    • 3
  1. 1.College of Science and TechnologyKanazawa UniversityKanazawaJapan
  2. 2.Graduate School of Advanced Sciences of MatterHiroshima UniversityHigashi-HiroshimaJapan
  3. 3.Phosphorus Atlas Research InstituteWaseda UniversityShinjuku-ku, TokyoJapan

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