Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

Civil Engineering (CE): Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

The document Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Environmental Engineering.
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)

Total Solid and Suspended Solid
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

Acceptable limit of total solid = 500 mg/lit

Threshold odour number

Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
where TON = Threshold odor number
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

Constituents of Alkalinity

Major sources → CO2-3, HCO-3, OH-
Minor sources → HS, O-3, H2BO-3, HPO2-4, HS
(a)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
Equivalent weight of
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE) 
(b)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
(c)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
where,
CO2-3 → x mg / lit of CaCO3
HCO-3 → y mg / lit of CaCO3
OH- → z mg / lit of CaCO3
Value of water
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
For strong acid.
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
For strong base
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
For neutral solution

Hardness of Water
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

where,
[Ca2+] is concentration of Ca2+ in mg / lit.
[Mg2+] is concentration of Mg2- in mg / lit
(a)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
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
Equivalent weight of Ca2+
= atomic weight/valency
= 40/2 = 20
Equivalent weight of Mg2+
= atomic weight/valency
= 24/2 = 12
Equivalent weight of CaCO3
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
∴ valency or n - factor = 2.
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
Note: -ve value is taken as zero.
(d) Hardness
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
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 CaCO3

Biochemical Oxygen Demand (BOD)

Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
 whereof 5 days
DOi - DOf = Loss of oxygen in mg/lit.
DOi = Initial dissolved oxygen concentration in the diluted sample.
DOf = Final dissolved oxygen concentration in the diluted sample.
(After 5 day of incubation of 20ºC)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

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

Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

Biological WQP

Testing of Colliforms is done

Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)
Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE)

The document Quality Control of Water Supplies Notes | Study Environmental Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Environmental Engineering.
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)

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