SOP Title: Cleaning of Reverse Osmosis Membrane

SOP Title: Cleaning of Reverse Osmosis Membrane

 

1. Objective:

To lay down a procedure for the Cleaning of Reverse Osmosis Membrane.

2. Scope:

This procedure is applicable for the Cleaning of Reverse Osmosis Membrane installed in the RO Unit in Engineering Department.

3. Responsibility:

3.1 Engineering Department: To prepare and review the SOP. To follow the procedure laid down   for the Cleaning of Reverse Osmosis Membrane as per this SOP.

3.2 Quality Assurance Department: To review and approve the SOP and Annexes. To ensure compliance to the SOP.

4. Accountability:

Head, Engineering Department / Head, Quality Assurance Department.

5. Procedure:
   • Definitions:

5.1.1   Engineering Associate: Executive or Operator of Engineering Department trained to perform duties as per this SOP.

 

5.2.    Operational Procedure:              

	Safety Precautions/Instructions:
5.2.1	Wear appropriate Personal Protective Equipment while cleaning the Reverse Osmosis Membrane.
5.2.2	Material Safety Data Sheet for chemicals to be used is collected and used in case of any emergency.
5.2.3	Do not run the pump in dry condition.
	Requirements
5.2.4	Five plastic tanks of 50 litres capacity.
	Operation:
5.2.5	Collect the 500 litres of purified water for cleaning of RO Membrane in the RO storage tank.
5.2.6	Put the inlet (suction) pipe of cleaning of RO membrane pump in chemical cleaning tank.
5.2.7	Close the valve of high pressure pump by rotating handle in to clockwise direction.
5.2.8	Turn the valve (blue colour) located near discharge side of cleaning of RO membrane pump in to anticlockwise direction.
5.2.9	Turn the valve located near discharge side of cleaning of RO membrane pump in to anticlockwise direction.
5.2.10	Connect the cleaning of RO membrane pump to mains.
5.2.11	Fill the purified water cleaning tank No. 1 with 50 litres of water.
5.2.12	Put ON the cleaning of RO membrane pump and recycle this water through RO membrane for 60 minutes, at the end of 60 minutes stop pump & drain the Purified cleaning tank.
5.2.13	Wash tank with RO water, then rinse with Purified water.
5.2.14	Fill the chemical cleaning tank NO. 2 with 50 litres of purified water, 200 gm of Sodium Hydroxide, 200 gm EDTA Disodium salt and 200 gm Sodium Lauryl Sulphate. Mix the solution properly.
5.2.15	Put ON the cleaning of RO membrane pump and then recycle this solution for 60 minutes through the RO membrane.
5.2.16	At the end of 60 minutes stop pump and drain the chemical cleaning tank.
5.2.17	Wash tank with RO water, then rinse with purified water.
5.2.18	Fill the cleaning tank NO.1 with 50 litres of purified water.
5.2.19	Put ON the cleaning of RO membrane pump, recycle the purified  water through the RO membrane for 60 minutes, at the end of 60-minuets stop pump and then drain purified cleaning tank.
5.2.20	Wash tank with RO water, then rinse with purified water.
5.2.21	Fill the chemical cleaning tank No. 3 with 50 litres of purified water and 200 ml of Hydrochloric Acid. Mix the solution of properly.
5.2.22	Put ON the cleaning of RO membrane pump and then recycle this solution for 30 minutes through the RO membrane.
5.2.23	At the end of 30 minutes stop pump and drain the chemical cleaning tank.
5.2.24	Wash tank with RO water, then rinse with purified water.
5.2.25	Fill the cleaning tank No.1 with 50 litres of purified water, put ON the cleaning of RO membrane pump & recycle the purified water through the RO membrane for 60 minutes, at the end of 60 minutes stop pump and then drain cleaning tank.
5.2.26	Wash tank with RO water, then rinse with purified water.
5.2.27	Fill the chemical cleaning tank No.4 with 50 litres of purified water and 200 ml of Formaldehyde. Mix the solution properly.
5.2.28	Put ON the cleaning of RO membrane pump and then recycle this solution for 30 minutes through the RO membrane.
5.2.29	At the end of 30 minutes stop pump and drain the chemical cleaning tank. Wash tank with RO water, then rinse with purified water.
5.2.30	Fill the cleaning tank No.1 with 50 litres of purified water, put ON the cleaning of RO membrane pump; recycle the purified water through the RO membrane for 60 minutes, at the end of 60 minutes stop pump and then drain cleaning tank.
5.2.31	Wash tank with RO water, then rinse with purified water.
5.2.32	Fill the cleaning tank No.1 with 50 litres of purified water, put ON the cleaning of RO membrane pump; recycle the purified water through the RO membrane for 60 minutes, at the end of 60 minutes stop pump and then drain cleaning tank.
5.2.33	Wash tank with RO water, then rinse with purified water.
5.2.34	Fill the chemical cleaning tank No. 5 with 50 litres of purified water and 200 gm of Citric acid. Mix the solution properly. Put ON the cleaning of RO membrane pump and then recycle this solution for 30 minutes through the RO membrane.
5.2.35	At the end of 30 minutes stop pump and drain the chemical cleaning tank. Wash tank with RO water, then rinse with purified water.
5.2.36	Fill the cleaning tank No. 1 with 50 litres of purified water, put ON the cleaning of RO membrane pump; recycle the purified water through the RO membrane for 60 minutes, at the end of 60 minutes stop pump and then cleaning tank.
5.2.37	Wash tank with RO water, then rinse with purified water.
5.2.38	After completion of the RO membrane, send Water Testing Intimation Slip to QC Department as per Annexure.
5.2.39	Update the “Cleaning Record of Reverse Osmosis Membrane” as per Annexure.
	Cleaning Frequency:
5.2.40	Once in 3 month or when the output of product water quality decreases (conductivity increases > 1.0 µS/cm).

6. Abbreviation:

Abbreviation	Expansion
UTL	Utility
PPE	Personnel Protective Equipment
RO	Reverse Osmosis
QC	Quality Control
gm	Gram
µS/cm	Micro Simon Per Centimetre
>	Greater Than
EDTA	Ethylene Di-amine Tetra Acetic Acid

 

*Note – Ready to use SOP available in “DOWNLOAD” Section.