Environmental Engineering : Quality of water

By Aditya Kumar|Updated : September 7th, 2021

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Water Quality Parameters

Total Solid and Suspended Solid

 

 Acceptable limit of total solid = 500 mg/lit

Threshold odour number

 

 where TON = Threshold odor number

  

constituents of Alkalinity

 Major sources  

 Minor sources  

(a)

 

 Equivalent weight of

   

(b)

  

(c)

 

 where,

  

 Value of water

  For strong acid.

  For strong base

  For neutral solution

 

Hardness of water

  

 where,

  

(a)

 

 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

  

 

(b)  

(c)  

 Note: -ve value is taken as zero.

(d) Hardness

  

 Household supplies limit 74-115 mg/l

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

 and cause of rejection is 600 mg/lit as

Biochemical Oxygen Demand (BOD)

  

 whereof 5 days

  Loss of oxygen in mg/lit.

  Initial dissolved oxygen concentration in the diluted sample.

  Final dissolved oxygen concentration in the diluted sample.

 (After 5 day of incubation of 20oC)

 

 

·              Turbidity>5 units–detectable by naked eye.

·              In Nephlometer, turbidity is expressed in FTU.

 

Biological WQP

 Testing of Colliforms is done

 

 

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Aditya Kumar
Aditya KumarMember since Feb 2021
B-Tech(Civil Engg) NIT Allahabad
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