Wastewaters from egg processing plants typically carry high wasteloads. The main part of the wasteload is egg solids with lesser amounts of dirt, manure, and cleaning compounds. We found that the egg solids could be recovered, after adjusting the pH of the wastewater to 4.7, heating to 75°C., and filtering or centrifuging the mixture. This process reduced the biochemical oxygen demand (B.O.D.) of the wastewater by 76 to 97%. Recovered egg solids might be used as livestock feed. The combination of heat and acid is adequate to destroy Salmonella or other harmful bacteria present.
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Harris et al. (1975) studied this question.