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Standard Operating Procedure for Regeneration of Softener

SOP Number: Hotel Engineering SOP  – 05

Department: Engineering and Maintenance

Date Issued: 14–Feb-2018

Time to Train: 30 Minutes

Regeneration of softener Standard Procedure

Stages of regeneration of softener:

1) Back-wash:

  • Backwash is reverse flow in the softener bed by closing normal flow inlet and outlet valve and opening the backwash inlet and outlet valve.

  • The dirty water is drained out during the backwash process.

  • This process is done to clean the resin bed and also obtain free flow during normal process.

  • The backwash time depends upon the watercolour or dirt accumulated.

  • When clear water is draining backwash system is closed, and the salt or brain charging starts.

2) Salt charge or Brine charge:

  • It is done by introducing common salt solutions of 1.8 specific gravity, by the ejecting system.

  • Salt solution is kept prepared in salt tank where ejector suction pipe is placed.
  • During salt charging the entire solution in the tanks is emptied, then close the drain valve of the softener and also close the salt charging inlet valve.

  • Keep the softener bed for 10 - 20 minutes by the brine solution in order for recharging the resins inside the bed, and then start rinsing process.

  • The quantity of salt used in one regeneration is 200 - 300 Kgs. (depending upon the filter size.)

3) Rinsing of the softener:

  • Open the normal flow inlet valve, close the normal outlet valve and then open the drain valve.

  • Start raw water pump to drain the water till the taste of the water is sweet.

  • Once you feel the water is sweet, test the water with the reagents for measuring the hardness of the soft water.

  • When the sample of soft water is 10ppm as CaCo3 it indicates that the water is ready to be put into the process/consumption.

Procedure for hardness test:

  1. Take 50 ml of water to be tested in a beaker.

  2. Add one tinch of reagent "A", after adding the sample water colour turns pink/ red.

  3. Add reagent "B", 10 to 15 drops.

  4. Now start adding reagent "S" drop by drop and stir the solution simultaneously count the number of drops.

  5. When the sample colour turns pink to blue count the no. of reagent "S" and multiply by 2.

  6. Hardness is no. of reagent drops x 2 = hardness of water in ppm as CaCo3

  7. 10 drop x 2 = 20 ppm(e.g.)

Training Summary questions:

Q1. Explain the procedure for water hardness test?

Q2. What are the main stages of regeneration process?

Q3. What is the quantity of salt used in one regeneration?

Q4. How long the softener bed to be kept on brine solution?

Q5. What are the steps in rinsing the softener?