Improving the Biodegradation of Organic Pollutants with Ozonation during Biological Wastewater Treatment

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Sridhar, Anand
Harrata, Abdel Kamel
Esplugas, Marc
Onuki, Shinnosuke
Cai, Lingshuang
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Koziel, Jacek
Professor Emeritus
van Leeuwen, Johannes
Professor Emeritus
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The Department of Chemistry seeks to provide students with a foundation in the fundamentals and application of chemical theories and processes of the lab. Thus prepared they me pursue careers as teachers, industry supervisors, or research chemists in a variety of domains (governmental, academic, etc).

The Department of Chemistry was founded in 1880.

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Agricultural and Biosystems Engineering

Since 1905, the Department of Agricultural Engineering, now the Department of Agricultural and Biosystems Engineering (ABE), has been a leader in providing engineering solutions to agricultural problems in the United States and the world. The department’s original mission was to mechanize agriculture. That mission has evolved to encompass a global view of the entire food production system–the wise management of natural resources in the production, processing, storage, handling, and use of food fiber and other biological products.

In 1905 Agricultural Engineering was recognized as a subdivision of the Department of Agronomy, and in 1907 it was recognized as a unique department. It was renamed the Department of Agricultural and Biosystems Engineering in 1990. The department merged with the Department of Industrial Education and Technology in 2004.

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  • Department of Agricultural Engineering (1907–1990)

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Food Science and Human NutritionCivil, Construction and Environmental EngineeringChemistryAgricultural and Biosystems EngineeringToxicology

Pre-ozonation is often used to enhance the biodegradability of recalcitrant compounds prior to biological treatment of wastewater. A usual shortcoming of such an approach is wasting ozone on other compounds that are already biodegradable. This research followed a groundbreaking approach of degrading a recalcitrant substance with ozone during biological treatment. Two parallel bench-top activated sludge processes were fed a synthetic wastewater containing typical biodegradable substances and also methylene blue at 5 mg/L. Ozone was applied continuously and directly into one of the activated sludge units at 17 mg/L based on inflow rate. The methylene blue was removed by 95% in the ozonated process compared with just 40% removal in the non-ozonated control. The removal in the activated sludge without ozonation was demonstrated to be mainly due to biosorption. The ozone oxidation reaction by-products were analyzed using GC-MS on volatile substances collected in the headspace above ozonated samples of methylene blue and most found to be biodegradable. These by-products are expected to be degraded and assimilated in the same process unit together with the other biodegradables in the feed stream by the activated sludge process. The reaction rate with organic substances depleted the dissolved ozone at such a rate that the inactivation of the treatment bacteria (and protozoa) was minimal, mostly affecting the filamentous bacteria. A concern that ozone, as a powerful disinfectant, could inhibit or kill the beneficial bacteria in the activated sludge process was proven to be incorrect.


This is an Accepted Manuscript of an article published by Taylor & Francis as Van Leeuwen, J., Anand Sridhar, A. Kamel Harrata, Marc Esplugas, Shinnosuke Onuki, Lingshuang Cai, and Jacek A. Koziel. "Improving the biodegradation of organic pollutants with ozonation during biological wastewater treatment." Ozone: Science & Engineering 31, no. 2 (2009): 63-70. Available online DOI: 10.1080/01919510802668380. Posted with permission.

Thu Jan 01 00:00:00 UTC 2009