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Plz help me in creating the ppt for waste water treatment plant (acc. to class 10th)
Answers
Wastewater Treatment
• Preliminary Treatment (screening )
• Primary Treatment (primary settling)
• Secondary Treatment (e.g. activated sludge)
• Advanced Treatment (e.g. P removal)
• Final Treatment (disinfection)
• Solids Processing (sludge treatment)
Preliminary treatment
Upon arrival via the sewer system, the wastewater is
sent through a bar screen, which removes large solid
objects such as sticks and rags.
Leaving the bar screen, the wastewater flow is slowed
down entering the grit tank, to allow sand, gravel and
other heavy material that was small enough not to be
caught by the bar screen to settle to the bottom. All the
collected debris from the grit tank and bar screen is
disposed of at a sanitary landfill.
Primary treatment
Primary treatment is the second step in wastewater
treatment. It allows for the physical separation of solids
and greases from the wastewater. The screened
wastewater flows into a primary settling tank where it is
held for several hours allowing solid particles to settle to
the bottom of the tank and oils and greases to float to the
top.
Secondary treatment
-biological treatment process that removes dissolved
organic material from wastewater. The partially treated
wastewater from the settling tank flows by gravity into an
aeration tank.
-mixing of water to solids containing that use oxygen to
consume the remaining organic matter in the wastewater
as their food supply (use of air bubble for mixing and
oxygen supply)
-liquid mixture (i.e., solids with micro-organisms and
water) is sent to the final clarifier.
-In clarifier, solids settle out to the bottom where some of
the material is sent to the solids handling process and
some is recycled back to replenish the population of
micro-organisms in the aeration tank to treat incoming
wastewater.
Final treatment
Treated water is disinfected and then it is send out for
wastewater reuse activities or for discharging in
river/streams. mostly chlorination and/or ultra violet
irradiation is used for disinfection purposes.
Solids processing
The primary solids from the primary settling tank and the
secondary solids from the clarifier are sent to a digester.
Micro-organisms use the organic material present in the
solids as a food source and convert it to by-products such
as methane gas and water.
Digestion results in a 90% reduction in pathogens and the
production of a wet soil-like material called “biosolids” that
contain 95-97% water.
In order to remove some of this water, mechanical
equipment such as filter presses or centrifuges are used
to squeeze water from the biosolids to reduce the volume
prior to being sent to landfill, incinerated or beneficially
used as a fertilizer or soil amendment.
