REGENERATION OF MIXED BED

1. OBJECTIVE

         To lay down the procedure for regeneration of mixed bed.

• SCOPE

This SOP is applicable in Water System for regeneration of mixed bed.

• RESPONSIBILITY

Water system operators/ Engineers

:

To follow the procedure

• ACCOUNTABILITY

Head Engineering                                   :    System Compliance

• PROCEDURE
  • Regenerate the mixed bed, after generation of approx 90 KL water or when the conductance increases from 1.0 µS/cm or pH does not comply the specification i.e 5.0 – 7.0, as per given below procedure.
  • Back Wash:
    • Flow Rate: 1.1 m³/hr.
    • Washing Period : 15 minutes
    • In feed water: RO Water.
    • Close the valves V1 and V2.
    • Open the valves V3, V4 &V12 and switch ON the MB feed pump.
    • Left the system for 10 minutes.
    • During back washing the flow of water should be in upward position.
  • Off the water system and close all the valves.
  • Caustic Injection
  • Requirement : Sodium Hydroxide

Conditions

   Flow Rate: 1.0 m³/hr.

• Time: 15 minutes.
  • Infeed Water: RO Water
  •  Preparation of Sodium Hydroxide Solution: Prepare sodium hydroxide solution by dissolving 10 kg. Sodium Hydroxide pellets in 34 liters of RO water in a plastic carboy carefully.
  • Open the valves V6, V7 and V2 and switch ON the MB feed pump. When the water flows then open the injector valve V5. This process takes 15 minutes.
  • Caustic Rinse – Conditions:

   Flow Rate: 0.175 m³/hr.

• Time: 30 minutes.
  • In feed Water: R O Water.
  • After completion of caustic injection close valve V5 and let the valves V7, V6 &V2 open. This process takes 30 minutes. During this process water flows from top to middle.
  • After completion of process close all the valves.
  •       Acid Injection Second Cleaning:
    • Requirement: 33 % Hydrochloric Acid.
    • Conditions:
      • Flow Rate: 0.167 m³/hr.
      • Time: 15 minutes.
      • In feed water: RO Water
    • Preparation of 33 % Hydrochloric Acid: Take 21 liter Conc. Hydrochloric acid and mix in 60 liters RO water carefully in plastic carboy.
    • Open the valves V9 and V10 and switch ON the MB feed pump. When the water flows then open the injector valve V8 & V1. This process takes 15 minutes.
  •       Acid Rinse:
    • Conditions:
      •  Flow Rate: 0.25 m³/hr.
      • Time : 36 minutes
      • In feed Water : R O Water
    • After completion of acid injection close valve V8 and let the valves V9, V10 & V1 open. This process takes 36 minutes. During this process water flows from middle to downwards.
  •  Drain Down:
    • Open the valves V10 and V12. This process takes 5 minutes.
  • Air Mixing:
    • Air pressure: 0.5 kg / cm²
    • Open the valves V11 and air outlet valve V12 and let the resin mixed. This process takes 10 minutes. During this process the air pressure should be maintained.
    • After completion of process close the valve V11.
    • Note: Air should be dried and oil free.
  • Final Rinse:
    • Open the MB inlet valve V01 and rinse valve V10 and let the water flowed through column.
    • Continue this process till the conductance reaches below 1.0 µS/cm & pH 5.0 to 7.0.
  • Release of Purified Water:
    • When the conductance reaches below 1.0 µS/cm and pH between 5.0 & 7.0 then supervisor of water system inform to Quality Control Department to collect the water sample for testing.
    • Q.C. Chemist should sample the water from the mixed bed sampling point and test the sample.
    • After completion of analysis, Q.C. chemist should prepare the report and send to the water system.
    • After release of water collect the purified water in the purified water storage tank.
  • Write the detail in log sheet.

       TRAINING

Trainer   : Head – Quality Assurance& Engineering Department.

            Trainees : Engineering- Executive & Supervisors. 

       DISTRIBUTION

Master Copy                     :          Quality Assurance Department

Controlled Copy               :          Engineering Department  

Display Copy                    :          Engineering Department (If Required)

  ATTACHMENTS

Sr. No.	Annexure No.	Title	Format No.
1	NA	NA	NA

• REFERENCES       

In-house

    ABBREVIATION

Abbreviation	Extended Form
EG	Engineering
SOP	Standard Operating Procedure
QA	Quality Assurance
WH	Warehouse
NA	Not Applicable
MB	Microbiology

      11.0 REVISION HISTORY OF CHANGE

Sr. No.	Date	Revision Details	Revision No.