SOP for Preparation of Sodium Hypochlorite Solution ( NaOCl )

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OBJECTIVE

To lay down the procedure for to provide a written procedure for preparation of Sodium Hypochlorite solution

SCOPE

This SOP shall be applicable for the Pretreatment System


RESPONSIBILITY

Operator/ Engineer/ Executive


PROCEDURE 

  1. Calculation for NaOCl dosing Flowrate:-

              Flow (m3/hr) x ppm of dosage

      =  ————————————————————–

          10 x Concentration of dosing solution

          2.5 x 2                         5

      =  ————— =           ———      =   0.5 LPH

          10 x 1                           10

Considering 48 hrs of operation 24 lts of solution need to prepared

  1. Preparation of Sodium Hypochlorite solution of 1 % concentration
    1. Take 20.5 liters of fresh potable water in dosing tank.
    2. Add 3.5 liters of fresh Sodium Hypochlorite (7% weight/volume (w/v) concentration-approx.) in dosing tank and stir with the help of S.S. appro.
    3. Adjust dosing rate such that free chlorine level approx.. 2 ppm is maintained at the outlet of the recirculation pump (This is checked by Free Chlorine Test Kit).
    4. Prepare and add fresh solution in the dosing tank in every 48 hrs.
    5. Avoid low level situation in dosing tank.

NOTE:

·       Dosing solution should be prepared in soft water/ potable water only.

·       Dosing Solution should be replaced once in two days.

·       Dosing tank should cleaned once in a two days

Must Try,

Pump Dosing Rate and Dosing Solution Preparation Calculation