Real-time aeration efficiency monitoring in the activated sludge process and methods to reduce energy consumption and operating costs

Water Environment Research : a Research Publication of the Water Environment Federation
Shao-Yuan LeuMichael K Stenstrom

Abstract

Aeration is the most energy intensive unit operation in municipal wastewater treatment, and fine-pore diffusers have been widely used to minimize power consumption. Unfortunately, fine-pore diffusers suffer from fouling and scaling problems, which cause a rapid decline in aeration performance and significant increase in power consumption. Diffusers must be cleaned periodically to reduce energy costs. The cleaning frequency of diffusers is site-specific and its effectiveness can be evaluated with oxygen transfer efficiency (OTE) testing. Off-gas testing is the best technique for measuring OTE in real-time. Fine-pore diffusers have low a factors that are further reduced at high loading rate. A time-series of off-gas measurements were conducted to demonstrate the value of real-time OTE data for developing energy-conserving operating strategies. The observations confirm the inverse correlation between OTE and airflow rate as well as the economic benefits of diffuser cleaning. In addition, mathematic models were applied to simulate the transient oxygen uptake rate (OUR) and show the impact of varying load on OTE and aeration cost, especially when faced with time-of-day power rates. Regular diffuser cleaning can reduce average power ...Continue Reading

References

Mar 21, 2002·Water Research·S Marsili-Libelli, F Tabani
Jun 1, 2004·Water Environment Research : a Research Publication of the Water Environment Federation·Stéphanie CapelaAlain Héduit
Jun 23, 2005·Water Environment Research : a Research Publication of the Water Environment Federation·D RossoM K Stenstrom
Mar 22, 2006·Water Research·Diego Rosso, Michael K Stenstrom
Oct 25, 2006·Water Environment Research : a Research Publication of the Water Environment Federation·Diego Rosso, Michael K Stenstrom

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Citations

Mar 1, 2012·Water Environment Research : a Research Publication of the Water Environment Federation·Shao-Yuan LeuMichael K Stenstrom
Apr 21, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Nasir EmamiDiego Rosso
Oct 11, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Victory O OdizeDiego Rosso
Oct 30, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Andreia AmaralDiego Rosso
Jun 19, 2017·Applied Biochemistry and Biotechnology·Dena Z KhaterRabeay Y A Hassan
Oct 27, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jun-Jie Zhu, Paul R Anderson
Jul 25, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Ken CampbellChris Struemph
Feb 7, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·George TchobanoglousHarold Leverenz
Mar 11, 2020·Environmental Science & Technology·Manel Garrido-BaserbaManel Poch

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