Water treatment

2.  Water treatment is the process of removing
contaminants from wastewater and household water.
 It includes physical, chemical, and biological
processes to remove physical, chemical and
biological contaminants.

3.  To kill all pathogenic germs, which are harmful to
human health
 To remove the unpleasant and objectionable taste and
odors from the water
 To remove dissolved gases, colour of water
 To make water fit for domestic, and commercial uses.
 Remove dissolved gases such as hydrogen Sulphide,
which can contribute to taste and odor problems

4. 1. SCREENING
2. AERATION
3. FLOCULATION
4. SEDIMENTATION
5. COAGULATION
6. FILTERATION
7. DISINFECTION
8. SOFTENING

6.  Screening is the first unit operation used
at wastewater treatment plants
 Screening removes objects such as rags, paper,
plastics, and metals to prevent damage and
clogging of downstream equipment, piping, and etc.
 Screening is done with the help of -------
1. Coarse Screen
2. Fine Screen

7.  Coarse Screen in the form of bar of size 10mm to
25mm having spacing of 2200mm center to center

9.  Fine screens are used to remove particles that may
cause maintenance issues for process equipment
and/or operational problems to the treatment process.
 Typically in smaller treatment facilities.
 Fine screens can be used in place of primary
clarification.

11.  It is the process in which water of brought intimate
contact of air.
 It removes undesirable gases.
Co2 , H2S.
 It removes undesirable organic mater.
 Aeration is often the first major process at
the treatment plant.

13.  A process wherein colloids come out of suspension in
the form of floc, either naturally or due to the addition
of a clarifying agent.

14.  Sedimentation is the process removes suspended
particle form the water which could not be removes
in the screening process.
 This action is in response to gravitational forces,
centrifugal acceleration or electromagnetism.

16.  A chemical process that involves a neutralizing
charge on the particles. This occurs when a coagulant
is added to water to destabilize colloidal suspensions.
 The coagulation and flocculation in water and
wastewater treatment processes can be used as a
preliminary or intermediary step between other water
or wastewater treatment processes like filtration and
sedimentation.

18.  It is carry out for the removes of fine suspended
particles and flow from the water.
 Filtration also remove organic matter. Micro organism ,
minerals form the water,

19.  Disinfection is a physical or chemical process in
which pathogenic microorganisms are deactivated or
killed.
 Examples of chemical disinfectants are chlorine
dioxide.
 Examples of physical disinfectants include ultraviolet
light, electronic radiation, and heat

21.  Water softening is a process that deals with a problem
called "hard water." Hard water is any type of water
that contains more minerals than average tap water.
 Mostly it has to do with elevated levels of calcium
and magnesium, which can make it difficult for
products like soap to dissolve in the water.

22. Thank You
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