Energy savings by reduced mixing in aeration tanks: Results from a full scale investigation and long term implementation at Avedoere wastewater treatment plant

Anitha Kumari Sharma, T. Guildal, H.R. Thomsen, B.N. Jacobsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The aim of this project was to investigate the potential of reducing number of mixers in the biological treatment process and thereby achieve energy and economical savings and contribute to cleaner environment. The project was carried out at Avedoere wastewater treatment plant and a full scale investigation was conducted to study the effect of reduced mixing on flow velocity, suspended solid sedimentation, concentration gradients of oxygen and SS with depth and treatment efficiency. The only negative effect observed was on flow velocity; however the velocity was above the critical velocity. The plant has been operating with 50% of its designed number of mixers since September 2007 and long term results also confirm that reduced mixing did not have any negative effect on treatment efficiency. The estimated yearly electricity saving is 0.75 GWh/year. © IWA Publishing 2011.
Original languageEnglish
JournalWater Science and Technology
Volume64
Issue number5
Pages (from-to)1089-1095
ISSN0273-1223
DOIs
Publication statusPublished - 2011

Keywords

  • Biological treatment
  • Electricity saving
  • Energy
  • Mixing
  • Aeration tanks

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