Life cycle assessment of cleaning-in-place operations in egg yolk powder production

The manufacture of egg yolk powder by spray drying requires regular cleaning in order to remove fouling deposits and prevent microbiological growth on the pasteurisation heat exchanger dryer. A life cycle assessment (LCA) study a typical manufacturing plant, using literature data, indicated that breaking, storage steps were major contributors plant’s environmental impacts rather than cleaning-in-place (CIP) operations owing their high water electricity consumption (for refrigerated storage). CIP thermal energy wastewater emissions nevertheless significant, benefits intermittent flows aqueous NaOH solution dryer stage, reported Yang et al. (2019), assessed. latter gave 21% improvement terrestrial ecotoxicity impact. Optimising NaOH/temperature conditions based experimental data more efficient with lower water, chemicals consumption. Over-cleaning had significant marine as well reducing productivity. Three changes technology considered briefly: electrical heating, solar heating pumping, membrane treatment wastewater. These little overall global improvement, partly due polluting nature available supply (coal-fired) local factory being offset associated equipment manufacture.