抄録
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).
本文言語 | English |
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ホスト出版物のタイトル | Phosphorus Recovery and Recycling |
出版社 | Springer Singapore |
ページ | 515-526 |
ページ数 | 12 |
ISBN(電子版) | 9789811080319 |
ISBN(印刷版) | 9789811080302 |
DOI | |
出版ステータス | Published - 2018 5月 25 |
ASJC Scopus subject areas
- 環境科学一般
- 工学一般
- 化学工学一般