This ppt basically depends on primary waste water treatment. It gives brief description about what is water treatment,sources of waste water,types of waste water basically mostly focus on primary treatment like screening,types of screening,description on every type of screens, grit removal,communator,primary sedimentation.

1. PRIMARY WASTE WATER
TREATMENT
SUBMITTED BY
KANCHAN
B.Tech 3RD YEAR(CE)
BANASTHALI UNIVERSITY

2. WHAT IS WASTE WATER?
 Wastewater is a liquid waste ,which
consists of animal, vegetable or chemical
matter in water.
Waste water contain pathogens(disease
causing organisms).
It must be treated before it can be used
or released back into the environment.

3. 5 major Sources of waste
water
Insdustrial
Irrigation
Domestic/Residential
Public Supplied
Industrial,Commercial
Mining

4. Purpose Of Wastewater
Treatment
To manage
water
discharged From
homes,
businesses,
and industries to
reduce the threat
of water

5. 3 Stages Of Wastewater
Treatment
 Primary Treatment
 Secondary Treatment
 Tertiary Treatment

6. PRIMARY TREATMENT
-Typical Materials That Are Removed During
Primary Treatment Include
# Fats, Oils, And Greases (Aka FOG)
#Sand, Gravels And Rocks (Aka Grit)
#Larger Settleable Solids Including
Human Waste, And Floating Materials .
- Protects Pumps And Equipment From Damage

7. METHOD USE IN PRIMARY
TREATMENT
Screening
Comminutar
Grit removal
Primary sedimentation

8. SCREENING
Screening Devises
Are Used To Remove
Solids From Waste
Water. Solids
Consists Of Sticks,
rags,
boards And Other
Large Object.

9. TYPES OF SCREENS
SCREENS
Coarse screens
6 to 50mm
Hand cleaned
Microscreens
<0.5 micrometer
Mecanically
cleaned
Reciprocating
rake screen
Fine screens
<6 mm
drum Staic wedge
wire

10. COARSE SCREEN
THESE TYPE OF
SCREEN ARE USED
TO PROTECT PUMPS
, VALVES AND
PIPELINES FROM
DAMAGE OR
CLOGGING BY RAGS
AND LARGE
OBJECTS.

11. HAND CLEANED CORSE SCREEN
They Are Also Known As
Bar Screens.
Bar Spacing Traditionally Of
Approximately 6 To 50mm
And Inclined At 45° To 60° To
The Flow.
 Screens Are Cleaned
Manually If The Object
Caught Is Larger.
The Main Advantage Is
That No Power Required.
The Main Disadvantage Is
That Manual Labour

12. MECHANICALLY CLEANED SCREENS
RECIPROCATING RAKE(CLIMBER) SCREEN
The advantage is that parts which required
maintenance are above water line.
The disadvantage is that screen may have limited
capacity in handling heavy screenings loads.

13. MICROSCREENS
The Filter Fabrics Have Openings Of
<0.5 micrometer And Are Fitted On The
Drum Periphery. The Waste Water
Enters The Open End Of The Drum And
Flows Outward Through The Rotating
Drum Screening Cloth. These Type Of
Screen Are Used In Secondary
Treatment.

14. FINE SCREENS
1. STATIC WEDGE WIRE
They Have 0.2 To 1.2mm
Clear Openings And Are
Designed For Flow rates
Of About 400 To
1200 L/m2.min.Head Loss
Ranges From 1.2 To 2 m.

15. 2. DRUM SCREEN
THE SCREENING MEDIUM MOUNTED
IS MOUNTED ON A CYLINDER THAT
ROTATES IN A FLOW CHANNEL.THE
WASTEWATER FLOWS INTO ONE
END OF THE DRUM AND OUTWARD
THROUGH THE SCREEN WITH SOLID
COLLECTION ON THE INTERIOR
SURFACE.

16. COMMINUTOR
A comminutor, also
known as the grinding
pump, cutting screen.
This cutting screen
shreds any large
chunks of organic
matter in the
wastewater into
smaller pieces. This
prevents the large
chunks from harming
the internal workings
of the treatment plant.

17. GRIT REMOVAL
A grit is pieces of rock, metal, bone,
and even egg shells, which are denser
than organic materials, to settle out of
the waste stream. Removal of grit
prevents damage to machinery through
abrasion or clogging.

18. GRIT CHAMBER
In these type of
chamber a
constant flow rate
is passed Through
the chamber and
the heavy particle
of water settle
down and collected
in the bottom of
the channel.

19. PRIMARY SEDIMENTATION
Remove Organic Solid(oil,grease)from
Waste Water.
It Proceed Type 2 Settling.
Organic Material Settles Down Usually
In The Range 1 To 2.5m/Hr
Sludge Should Be Remove Before
Anaerobic Condition Develop.

20. CONCLUSION
Through Primary Treatment,large
Particle Or Inorganic Substances
Are Removed From The Water.The
BOD Present After Primary
Treatment Is 140 mg/l And TSS
130 mg/l.