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Showing posts with label water tank. Show all posts
Showing posts with label water tank. Show all posts

Sunday, August 16, 2020

Disinfection of water tanks with chlorine (Liquid Sodium hypochlorite )

 


SOURCE OF ARTICLE:


Disinfection of water tanks with chlorine (Liquid Sodium hypochlorite )

Whenever monsoon arrives, so also arrives all water born diseases. Chlorination is the most common form of disinfection. Liquid sodium hypo chloride (Bleach) is used for disinfection.

How to use:

1.       Follow the table given below for doses of bleach required on the basis of tank volume..

2.        Concentration of chlorine required as per various purposes

a)      Routine disinfection of clean water = 1mg/liter

b)      Routine disinfection of less clean water = 2mg/liter 

c)     Disinfection of tank and pipe system  = 5mg/liter. It is to be disinfected fully twice a year. To disinfect connected lines and fixtures, open all tapes until a chlorine smell is apparent at each outlet. Close taps and allow the chlorinated water to sit for at least 12 hours to ensure adequate time for disinfection. Do not consume this water which has smell of chlorine . DRAIN, FLUSH & REFILL WITH FRESH WATER. Now you can use water safely for daily use.

 The maximum allowable WHO value for free chlorine residual in drinking water is 5 mg/L. The minimum recommended WHO value for free chlorine residual in treated drinking water is 0.2 mg/L. CDC recommends not exceeding 2.0 mg/L due to taste concerns, and chlorine residual decays over time in stored water.

USING 4% liquid bleach(Household liquid Sodium hypo chlorite)

One small tea spoon means 5 ml. Or use a measuring cup which you get with medicine.

 

Concentration of Chlorine required mg/liter

Concentration of Chlorine required mg/liter

Concentration of Chlorine required mg/liter

Amount of water in tank Liter

1

2

5 (Disinfection of whole house)

1000

25ml

50ml

125ml

2000

50ml

100ml

250ml

3000

75ml

150ml

375ml

4000

100ml

200ml

500ml

5000

125ml

250ml

625ml

 

USING 12.5% liquid bleach (Pool liquid Sodium hypo chlorite)

 

Concentration of Chlorine required mg/liter

Concentration of Chlorine required mg/liter

Concentration of Chlorine required mg/liter

Amount of water in tank Liter

1

2

5 (Disinfection of whole house)

1000

8ml

16ml

40ml

2000

16ml

32ml

80ml

5000

40ml

80ml

200ml

 

Don’t use Old bleach which may be stabilized, hence will not work.

 


REFERENCE : https://nt.gov.au/__data/assets/pdf_file/0010/208846/disinfection-of-water-tanks.pdf