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Chemical Analyses of Commercial Shell Egg Wash Water

USDA Agricultural Research Service, Russell Research Center, PO Box 5677, Athens, Georgia 30604-5677

Correspondence: J. K. Northcutt, E-mail: jnorthcutt{at}saa.ars.usda.gov

Wash water was collected from the first (W1) and second (W2) egg washers in series in 3 different commercial facilities (plants X, Y, and Z) and evaluated for temperature, pH, chlorine, soluble iron (ferrous), total dissolved solids (TDS), total suspended solids (TSS), total Kjeldahl nitrogen (TKN), and chemical oxygen demand (COD). Temperature of W1 and W2 ranged from 39.7 to 44.1°C and was generally consistent within plants Y and Z. The pH of W1 and W2 varied from 10.0 to 11.4. Chlorine levels in wash water differed by 3- (W2) and 5-fold (W1) between the facilities. Average values of soluble iron W1 and W2 ranged from 0.3 to 1.6 mg/L. Highest values for TDS and TSS occurred in W1 (8,231 and 796 mg/L, respectively) as compared with W2 (3,564 and 429 mg/L, respectively). The TKN values for the wash water ranged from 81 to 302 mg/L, whereas COD values ranged from 1,765 to 7,300 mg/L. Data provided by the present study may be useful for identifying process deficiencies and minimizing organic and inorganic discharge loads in the waste stream.

Key Words: shell egg • egg washing • egg-processing wastewate

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