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Upgrading aerated lagoons for the treatment of egg processing wastewater

University of British Columbia

The treatment of egg processing wastewater is typically accomplished in an aerated lagoon. However, to meet current wastewater guidelines, processing facilities must upgrade their systems. Without changing the dimensions of the system and without installing liquid-solid separation, upgrading to an sequencing batch reactor system is an attractive alternative. For this reason, two parallel lab-scale SBR systems were operated over an eight month period for the treatment of egg processing wastewater. The results showed very good removals of BOD, COD, and TSS. Aeration requirements were found to be 1.5 L/min for a single 4 litre reactor and 1.5 L/min & 0.5 L/min for two 4 litre reactors in series. K[sub L]a values of 5.0 hr⁻¹ and 10.8 hr⁻¹ were established for egg processing wastewater and clean water, respectively. Values for α and β were determined to be 0.46 and 0.97, respectively. The coefficients a', and b', for the determination of oxygen requirements, were established at 0.68 g O₂/g BOD and 0.36 d⁻¹, respectively. The kinetic growth coefficients were found to be: K[sub s] = 822 mg/L, k = 1.98 d⁻¹, kd = 0.07 d⁻¹, and Y = 0.32. The reductions in coliforms were from 3500 MPN/100 mis in the influent to 80 MPN/100 mis in the effluent. Confirmed coliforms were identified as Bacillus sp. and Micrococcus sp.. Salmonella and fecal coliforms were absent in both the influent and effluent wastewater.

Thesis/Dissertation

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2009-01-15

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http://hdl.handle.net/2429/3668

Biomedical Engineering

University of British Columbia

UBCV

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