Prevention of Spoilage of Liquid and Chemical Cleaning Procedure for Membrane in Treatment of Potato Juice by Reverse Osmosis

Abstract

Preventive measures against potato juice spoilage and a chemical cleaning procedure for membrane foulant which cannot be cleaned out with spongeballs in the reverse osmosis plant were considered.
Spoilage of potato juice occurs because the population of microorganisms increases logarithmically in the plant and spoilage is promoted by microorganism slime formed on inside walls of storage tanks or inside pipes within the plant.
Periodic discharge of juice in the plant and complete disinfection are required to prevent the formation of slime. The storage tank, therefore, must be so constructed as to allow complete discharge of the juice. Disinfection with a germicide (NaClO solution) after cleaning the equipment with water and a chemical detergent (pH-9.7) is effective. This is because the germicide is not used for oxidization of the juice adhering in the plant.
A small amount of membrane foulant is also removed by chemical cleaning.
A suitable cleaning and disinfection frequency is once a day, and the time required is 90-120 minutes.