1. Alkali washing: soak in 3-5% sodium hydroxide analytical pure solution for 30-60 minutes at a temperature of about 40 ℃. It is the best in ultrasonic cleaning machine. After soaking, rinse it inside and outside with filtered deionized water or water for injection to neutral, and measure the conductivity. Blow dry with pure air ≥ 0.4MPa.
2. Pickling: soak in 5% nitric acid solution for more than 8 hours at 40 ℃. It is the best in ultrasonic cleaning machine. After soaking, rinse it inside and outside with filtered deionized water or water for injection to neutral, and measure the conductivity. Blow dry with pure air ≥ 0.4MPa.
3. The above two methods can be used alone or alternatively. If possible, it can be combined with ultrasonic cleaning machine, and the effect is the best.
4. Organic pollution can be combined with surfactant cleaning, and the effect of cell debris pollution system combined with enzyme cleaning is more ideal.
(foods and beverages can be cleaned with high concentration citric acid) Note: it is necessary to often conduct on-line back flushing (pure compressed air or filtered stock solution or clean water is used for on-line cleaning), which can reduce the times of cleaning with the above methods
