Sludge ozonation and its application to a new advanced wastewater treatment process with sludge disintegration

Hideaki Nagare, Hiroshi Tsuno, Wilasinee Saktaywin, Tsunenari Soyama

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The applicability of sludge ozonation on wastewater treatment processes was investigated to reduce the amount of excess sludge without losing phosphorus removal efficiency. Solubilization degree per ozone consumption for general sludge was in the range from 2.4 to 5.8 gSS/O3 and from 4.1 to 7.7 gCOD/gO3. Around 80 to 90% of solubilized organics was biodegradable at a solubilization degree of 0.3. Based on the experimental results, a lab-scale plant with sludge ozonation and phosphorus crystallization was constructed to investigate the treatment performance. Amount of excess sludge was reduced by 93% with almost complete removal of soluble BOD and phosphorus removal efficiency of more than 80%. The percentage of the effluent CODCr discharge increased from 10% to 14-17% after installing ozonation and crystallization because of the formation of non-biodegradable organic substances in ozonation process. Energy consumption of the innovative advanced process is comparable or can be even smaller than that of the conventional anaerobic/oxic (A/O) process in spite of the installation of ozonation and crystallization.

Original languageEnglish
Pages (from-to)136-144
Number of pages9
JournalOzone: Science and Engineering
Issue number2
Publication statusPublished - Mar 1 2008
Externally publishedYes


  • Crystallization
  • Ozone
  • Phosphorus
  • Sludge
  • Wastewater Treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry


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