ENVIRONMENTAL ENGINEERING : Quality of water Notes

By Deepanshu Rastogi|Updated : April 16th, 2021

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

Quality control of Water Supplies

Total Solid and Suspended Solid

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Acceptable limit of total solid = 500 mg/lit

Threshold odour number

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where TON = Threshold odor number

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constituents of Alkalinity

 Major sources

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 Minor sources  

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Equivalent weight of

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(b)

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(c)

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where

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Value of water for For strong acid.

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 Value of water for For strong Base

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For neutral solution

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Hardness of water

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(a)

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Where,

 atomic weight of Ca = 40

 atomic weight of Mg = 24

 atomic weight of O = 16

 atomic weight C = 12

 valency of Ca = 2

 Valency of Mg = 2

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(b)

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(c)

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 Note: -ve value is taken as zero.

(d) Hardness

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Household supplies limit 74-115 mg/l

(e) The acceptable limit of hardness = 200 mg/lit as  CaCO3

and cause of rejection is 600 mg/lit as CaCO3

 Biochemical Oxygen Demand (BOD)

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whereof 5 days

DOi -DOf =Loss of oxygen in mg/lit.

DOi= Initial dissolved oxygen concentration in the diluted sample

 DO=Final dissolved oxygen concentration in the diluted sample.

 (After 5 day of incubation of 20oC)

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  •   Turbidity>5 units–detectable by naked eye.
  • In Nephlometer, turbidity is expressed in FTU.

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Biological WQP

 Testing of Colliforms is done

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