Disinfection of water tanks with chlorine (Liquid Sodium hypochlorite )

 

SOURCE OF ARTICLE:

1. http://origin.searo.who.int/entity/water_sanitation/documents/chlorination_guide_presentation.pdf

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

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