Initial Citric Acid Preparation
1. To add fresh water in Acid recovery tank to achieve 6,000L
2. To slowly add 300kg of citric acid powder into acid recovery tank while start internal system circulation on the same time.
3. To sampling acid solution to measure % of citric acid. If concentration is lower than 5% w/v , more citric acid must be added in the tank until concentration is equal or higher than 5%w/v.
4. To calibrate conductivity by using 5%w/v of Citric acid and using this number as up-concentration set point and recovery set point .