Abstract
The purpose of this study was to provide the technical information related to wastewater characteristics and treatability necessary for effective egg washing wastewater management. Wastewater samples were collected from three egg grading plants over a 3-month period and assayed for appropriate chemical characteristics. Typical values for some of the pollution parameters were found to be: biochemical oxygen demand (BOD) 3,000 mg/liter, chemical oxygen demand (COD) 6,000 mg/liter, total solids (TS) 9,000 mg/liter, and suspended solids (SS) 600 mg/liter. Treatment studies were performed using laboratory scale aerobic and anaerobic reactors. Wastewater retention times of 1, 2, 4, and 8 days were studied in the aerobic tests; 12 and 18 day retention times were investigated in the anaerobic tests. The wastewater was highly biodegradable in each environment. Filtrable COD was reduced 96% in the 8 day aerobic reactor and 92% in the 18 day anaerobic digester. Kinetic constants were determined and a mathematical model derived to enable design of full-scale aerobic systems.
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