Inhibitory effect of metal ions on the poly-phosphate release from sewage sludge during thermal treatment

Ming Yang Zhang, Takahiro Kuba

Research output: Contribution to journalArticle

7 Citations (Scopus)


The purpose of this study was aimed at identifying the influence of metal cations such as Mg2+, Ca2+, Al3+ and Fe 3+ on poly-phosphate (poly-P) and total phosphate (T-P) release from sewage sludge collected from wastewater treatment plant during thermal treatment at 70°C for 80 min. With the addition of chelating reagent such as EDTA, release of poly-P and T-P was improved obviously during thermal treatment. Inhibitory effect of metal cations on phosphorus release was apparent by adding metal cations into sludge sample. Most of Ca, Al and Fe inside of cell could be released into the supernatant, but captured in extracellular polymeric substance (EPS); oppositely, large quantity of Mg could be released into the supernatant directly and not concentrated in EPS. Performance of sewage sludge on phosphorus release in summer and winter was different; different precipitation and temperature possibly result in this phenomenon.

Original languageEnglish
Pages (from-to)1157-1164
Number of pages8
JournalEnvironmental Technology (United Kingdom)
Issue number9
Publication statusPublished - May 3 2014


All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Waste Management and Disposal
  • Water Science and Technology

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