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Usage of Glycerin for Denitrification in High Rate Activated Sludge Processes: Benefits and Limitations

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Evaluation of glycerin as a supplemental carbon source in high rate step feed BNR pilot plants (4.3 hrs HRT, 4-6 day Total SRT) indicated that performance with glycerin is adequate to meet effluent TN targets of less than 5 mgN/L under the above conditions, at temperatures as low as 14°C. Modeling of glycerin utilization for denitrification should be carried out using specialized population approach (similar to modeling of denitrification with methanol), as glycerin utilization exhibits a lower dentrification rate than readily biodegradable organics found in typical municipal wastewater. Sludge bulking observed in the reactor receiving glycerin may be mitigated by reducing glycerin dosage to better match actual denitrification demand. Elevated effluent soluble organic concentrations were not observed leaving the glycerin pilot even when peak glycerin dosages were applied with post-aerobic actual (flow through) detention times of as low as 14 minutes and a minimum operating temperature of 14°C.
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Keywords: Glycerin; bulking; denitrification; supplemental carbon

Document Type: Research Article

Publication date: 2011-01-01

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