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Effect of temperature and pH on biological oxidation of antifreeze coolant using a packed column aerator

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posted on 23.05.2021, 17:15 by Syed M Nasir Naqvi
Simulated wastewater containing 0.75% (v/v) antifreeze was treated biologically using a 0.18-m diameter packed column aerator with a 0.4-m higth packed bed of 20-mm polypropylene spheres. Effects of liquid temperature and pH on the biological oxygen demand (BOD₅) removal were investigated. All experiments were performed under an air flux of 0.0080 kg.m-².s-¹ and a liquid flux of 14.8 kg.m-².s-¹. An increasing trend of the BOD₅ removal with temperature was observed when liquid temperature was increased from 16 to 32 ºC by 4-degrees increments. When the wastewater pH was increased from 4 to 10 (by one-pH unit increments), the BOD₅ removal was increased by 18%. The averaged BOD₅ removal in the order of 90% (from the initial value of about 900 mg/L down to 80mg/L) was obtained after 96 hours of treatment. The stripping effect was accounted for about 75 mg/L of the overall BOD₅ change, i.e. about 9% of the overall BOD₅ removal. In addition, the BOD₅ removal due to the biomass in the packed column was also monitored. A decrease of about 15% in the BOD₅ removal was observed without packing in the packed column aerator.

History

Language

eng

Degree

Master of Engineering

Program

Chemical Engineering

Granting Institution

Ryerson University

LAC Thesis Type

Thesis

Thesis Advisor

Huu Dung Doan

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