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Evaluation of Flow-Equalization in Laboratory-Scale Sand/Textile Bioreactors for the Treatment of High-Strength Wastewater

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 32(6): 803-809. (doi: 10.13031/aea.32.11254) @2016
Authors:   T.V. Nimesha Madhavi Gunarathna, Chen Wang, Karen Marie Mancl, Olli H. Tuovinen
Keywords:   Biofilters, Dosing strategies, Fixed-media treatment, Flow-equalization, Sand filters, Wastewater treatment.

Abstract.

This research evaluated the need for and the role of flow-equalization in sand/textile bioreactor performance and compared different strategies of dosing applications for fixed-media treatment of high-strength wastewater. The experiment was designed with eight sand/textile bioreactors operated at 18°C-22°C to study three hydraulic loading strategies: time-dosing, demand-dosing, and extreme demand-dosing. High-strength wastewater was obtained from a turkey processing facility (BOD5 79-1,460 mg/L). Each dose was 0.016 cm and the average daily loading rate for all bioreactors was 4 cm/day (1 gal/ft2/day). All the dosing strategies achieved the regulatory requirement for BOD5 residual of <10 mg/L. The bioreactors were stabilized at about 40% clogging for all the dosing strategies in 150 days. Statistically significant differences were not found between the dosing strategies for the BOD5 removal efficiency. The results demonstrated that flow-equalization is not needed to achieve high treatment efficiency in sand/textile bioreactor systems.

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