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Alkaline Leaching of Phosphate from Sewage Sludge Ash

  • Ken-ichi SonodaEmail author
Chapter

Abstract

The alkaline technology has been applied to phosphate (Pi) recovery from sewage sludge ash (SSA) at wastewater treatment plants (WWTP). Pi is extracted from mono-incinerated sewage sludge with NaOH and recovered from the leachate using chemical precipitation with Ca(OH)2. Approximately 30–40% of Pi could be recovered from SSA as calcium Pi while minimizing the leaching of toxic heavy metals at high pH. The recovered P product can be recycled as a fertilizing material for agriculture.

Keywords

Alkaline leaching Calcium phosphate Sewage sludge ash Phosphate fertilizer 

References

  1. Moriya Y (2009) Phosphorus recovery technology from sewage sludge ash. J Resour Environ 45(6):35–39. (in Japanese)Google Scholar
  2. Yanase T (2009) Phosphorus recovery and detoxification system from sewage sludge ash. J Earth Environ 40(4):72–73. (in Japanese)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Business Strategy DivisionMETAWATER Co.TokyoJapan

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