Generally in BOD test for sewage water, it is prescribed to use distilled water for dilution along with addition of various nutrients viz. phosphate buffer, magnesium sulfate solution, calcium chloride solution and ferric chloride solution.
Is it possible to make dilution using tap water if yes or No kindly elaborate.
BOD test for sewage water is find by three ways.
Case1:- when no dilution is done.
Here we simply subtract Do initial to Do final and find out the BOD.
Case2:- when sample is diluted.
The sample used for dilution must possess following properties.
a) it should be free from organic matter.
b) it is prepared from distilled water.
c) it should contain inorganic nutrients.
d) it should be saturated with dissolved oxygen.
Here BOD can be found by difference of Do initial and Do final are multiplied with dilution factor/ dilution ratio.
Case3:- when sample is diluted and seeded.
It is the process of adding microorganisms in the sample during BOD test.
No, you cannot add tap water for dilution because the Tap water has TDS. You must be added distilled water for BOD test in domestic sewage.
Wastewater has a BOD higher than the amount of oxygen available in the BOD bottle during the incubation period, the samples must be diluted both for domestic or industrial waste waters. This dilution is done by adding dilution distilled water to the sample in the BOD bottle.
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