WHAT ARE THE DIFFERENT TYPES OF CLEANING IN PROCESS CYCLE?
- 1. SINGLE PASS SYSTEM
A new cleaning solution is given to the plant to be cleaned and subsequently disposed of the drain in a single pass system. A single pass system would typically begin with a pre-rinse to remove as much soiling as feasible. Following the detergent clean, a final rinse would be performed.
- 2. RECIRCULATION SYSTEM
The cleaning solution is prepared in a separate tank before being applied to the plant to be cleaned. Until the cleaning cycle is finished, it is recirculated and topped up as needed. After the detergent clean is complete, a final rinse is usually performed.
Recirculation systems utilise less water and cleaning detergents, but they require more capital investment and may be undesirable in some cases due to cross contamination from one operation to another.
ADVANTAGES OF CIP IN REVERSE OSMOSIS
- Less labour (minimise cleaning time)
- Better hygiene (automated systems clean and sanitise more effectively and consistently than manual cleaning)
- Cleaning solution conservation
- Increased utilisation of equipment and storage space
- Increased security
- Maintain a high level of plant production availability.
- Detergent and water usage optimization
- Difficult-to-reach areas can be cleaned.
STEPS INVOLVED IN CIP CYCLE
WATER CLEANING: Rinse RO membrane modules and system pipes with water at 60-80°C to remove dirt and other residual substances from the surface. Washing water can be RO produced water, softened water, or filtered water that meets RO inlet water standards. Cleaning takes about 10-15 minutes on average.
ALKALINE CLEANING: Prepare a 1-2 percent alkaline cleaning solution, keep the temperature between 60-80°C, and then clean the RO membrane modules and system pipes to remove protein, fat, and other contaminants. Cleaning takes about 10-15 minutes on average. Pay close attention to the degree of pollution in the backwater during the cleaning process. If the CIP's backwater is darker and turbid, there are more contaminants present, and the cleaning fluid must be discharged and adjusted.
WATER CLEANING: The RO membrane module and the system pipeline are rinsed with water at a temperature of 60-80°C after the alkaline cleaning procedure is done to eliminate the alkaline cleaning solution that remains in the RO membrane module and the system pipeline. After cleaning for 5-10 minutes, test the discharge cleaning water with pH test paper to check that the difference between the pH value of the cleaning inlet water and the pH value of the discharge cleaning water is less than 0.5.
ACID CLEANING: Cleaning the RO membrane modules and system pipes to remove inorganic salts, minerals, metal ions, and other contaminants requires an acidic cleaning solution with a 0.5-1 percent concentration, a temperature of 60-80°C, and a temperature of 60-80°C. Cleaning takes about 15-20 minutes on average.
WATER CLEANING: After the acid cleaning process, the RO membrane modules and system pipes are rinsed with water at 60-80°C to eliminate any acidic cleaning fluid that may have remained in the RO membrane modules and system pipes. After cleaning for 5-10 minutes, test the discharged cleaning water with pH test paper to check that the pH difference between the cleaning inlet water and the discharged cleaning water is less than 0.5. If the pH valve difference is greater than 0.5, clean until the pH difference is less than 0.5.