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A simple method to release polyphosphate from activated sludge for phosphorus reuse and recycling
Author(s) -
Kuroda Akio,
Takiguchi Noboru,
Gotanda Takafumi,
Nomura Kazutaka,
Kato Junichi,
Ikeda Tsukasa,
Ohtake Hisao
Publication year - 2002
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.10205
Subject(s) - polyphosphate , enhanced biological phosphorus removal , phosphorus , activated sludge , phosphate , chemistry , phosphorite , environmental chemistry , microorganism , wastewater , sewage treatment , pulp and paper industry , environmental science , organic chemistry , environmental engineering , bacteria , biology , engineering , genetics
In enhanced biological phosphorus removal processes, activated sludge microorganisms accumulate large quantities of polyphosphate (polyP). It was discovered that nearly all of the polyP could be released from activated sludge simply by heating it at 70°C for about 1 h. The chain length of released polyP ranged from 100 to 200 phosphate (P i ) residues. The addition of CaCl 2 precipitated approximately 75% of the total phosphorus without pH adjustment. The formed precipitate contained more P and less Ca than typical natural phosphorite deposits. Hence, in combination with enhanced biological phosphorus removal, the present method has potential for the development of a simple process for recovering phosphorus in a reusable form from wastewater. © 2002 Wiley Periodicals, Inc. Biotechnol Bioeng 78: 333–338, 2002.