Environmental Engineering : Quality of water

By Aditya Kumar|Updated : September 7th, 2021

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Water Quality Parameters

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 byjusexamprep 

 Minor sources byjusexamprep 

(a)

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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

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 byjusexamprep For strong base

 byjusexamprep For neutral solution

 

Hardness of water

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 where,

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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) byjusexamprep 

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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 byjusexamprep 

 and cause of rejection is 600 mg/lit as byjusexamprep

Biochemical Oxygen Demand (BOD)

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 whereof 5 days

 byjusexamprep Loss of oxygen in mg/lit.

 byjusexamprep Initial dissolved oxygen concentration in the diluted sample.

 byjusexamprep 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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