Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion

Noboru Takiguchi, Akio Kuroda, Hisao Ohtake, Satoshi Tsuneda

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    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).

    Original languageEnglish
    Title of host publicationPhosphorus Recovery and Recycling
    PublisherSpringer Singapore
    Pages515-526
    Number of pages12
    ISBN (Electronic)9789811080319
    ISBN (Print)9789811080302
    DOIs
    Publication statusPublished - 2018 May 25

    Fingerprint

    Polyphosphates
    Anaerobic digestion
    Sewage sludge
    Sludge digestion
    Phosphorus
    Leaching
    sludge
    Biogas
    phosphorus
    Biofuels
    leaching
    biogas
    Heating
    heating
    phosphate (inorganic)
    Phosphates
    Demonstrations
    Productivity
    leachate
    Polymers

    Keywords

    • Anaerobic sludge digestion
    • Bio-P sludge
    • Heatphos
    • Polyphosphate

    ASJC Scopus subject areas

    • Environmental Science(all)
    • Engineering(all)
    • Chemical Engineering(all)

    Cite this

    Takiguchi, N., Kuroda, A., Ohtake, H., & Tsuneda, S. (2018). Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion. In Phosphorus Recovery and Recycling (pp. 515-526). Springer Singapore. https://doi.org/10.1007/978-981-10-8031-9_35

    Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion. / Takiguchi, Noboru; Kuroda, Akio; Ohtake, Hisao; Tsuneda, Satoshi.

    Phosphorus Recovery and Recycling. Springer Singapore, 2018. p. 515-526.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Takiguchi, N, Kuroda, A, Ohtake, H & Tsuneda, S 2018, Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion. in Phosphorus Recovery and Recycling. Springer Singapore, pp. 515-526. https://doi.org/10.1007/978-981-10-8031-9_35
    Takiguchi N, Kuroda A, Ohtake H, Tsuneda S. Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion. In Phosphorus Recovery and Recycling. Springer Singapore. 2018. p. 515-526 https://doi.org/10.1007/978-981-10-8031-9_35
    Takiguchi, Noboru ; Kuroda, Akio ; Ohtake, Hisao ; Tsuneda, Satoshi. / Heatphos process for recovering phosphorus from bio-P sludge before anaerobic digestion. Phosphorus Recovery and Recycling. Springer Singapore, 2018. pp. 515-526
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