Egg breaking wastes were treated with 100–200 mg./l. chitosan, a by-product derived from shrimp and crab shells, and 2–20 mg./l. Betz 1130. Suspended solids in the wastewater were reduced by 70–90% and the COD by 55–75%. The yield of dry coagulated solids from wastes collected during cleanup was approximately 12 lb./1000 gal., and from the concentrated wastes in the egg washers, the yield was approximately 40 lb./1000 gal. The estimated polymer cost for coagulation of the egg washer wastes was $0.80/1000 gal. The amino acid composition of five samples of coagulated egg by-products approximated closely the composition of whole eggs. The value of the coagulated solids and the savings in waste treatment charges may encourage segregation and treatment of concentrated egg breaking wastes.
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Wayne A. Bough (1975) studied this question.
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