Mp. Olsson et al., SEQUENCING BATCH REACTORS FOR THE TREATMENT OF EGG PROCESSING WASTE-WATER, Canadian agricultural engineering, 39(3), 1997, pp. 195-202
Due to plant expansion, a British Columbia egg processor was looking f
or a means of increasing the capacity of an aerated lagoon system for
treating egg processing wastewater. To avoid a major capital investmen
t, upgrading to a sequencing batch reactor (SBR) appeared to be an att
ractive option. For this reason, two parallel lab-scale SBR systems we
re operated over an eight month period for the treatment of egg proces
sing wastewater. The results showed very good removal rates of 99% for
BOD, 88% for GOD, and 65% for TSS. Aeration requirements were found t
o be 1.5 L/min and 0.5 L/min for two 4 litre reactors in series. The c
oefficients a and b, for the determination of oxygen requirements, wer
e established at 0.68 g O-2/g BOD and 0.32 d(-1), respectively. Dissol
ved oxygen levels between 1 and 3 mg/L were maintained at a design mea
n cell residence time of 20 days. Coliforms were reduced from 3500 MPN
/100 mt in the influent to 80 MPN/100 mt in the effluent. Confirmed co
liforms were identified as Bacillus sp. and Micrococcus sp. Salmonella
and fecal coliforms were not detected in either the influent or efflu
ent wastewater.