The document outlines the Upflow Anaerobic Flush Blanket (UAFB) model for a sewerage treatment plant, detailing its processes including screening, sedimentation, and sludge treatment. The plant aims to reduce biochemical oxygen demand (BOD) from over 300 to below 30 before discharging treated water, while the methane generated during digestion is used to power the facility. Additionally, it highlights the importance of separating solid waste and the use of sludge as agricultural manure.

1. Sewerage Treatment Plant (STP)
Upflow Anaerobic Flush Blanket Model
(UAFB )
Dr Shyam Ashtekar
SMBT Medical College Nashik
Jan 2016
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2. The STP Model
A B
C
A: screening and grit removal, B: primary & secondary sedimentation,
C: sludge separation and water treatment
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3. The STP plant
• The STP aims to reduce
BOD from 300+ to <30
before water is
discharged into river or
farms
• The sludge is oxidized
and dried to make
manure.
• Methane generated in
digestion runs the
power plant for this STP.
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4. Screening for solid waste
• Sewage is 95%
water, with
human and
other waste
including
plastic bags,
sanitary pads,
grit etc
• The first job is
to separate the
solid waste by
screening
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5. Solid waste separated
• This is
what
should not
be thrown
into toilets
and
sewers..but
we do!
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6. Grit Chamber
• Removal
of sand
grit etc.
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7. Primary Sedimentation (8hrs)
• To settle
sludge
(organic
solid waste)
• The blue
pipes collect
methane gas
going to
power
generation
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8. Aeration to help bacterial oxidation of
sludge
• The
aerobic
bacteria
need
air/O2 to
oxidize the
sludge
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9. Secondary Sedimentation (6hrs)
• This finally
separates
sludge and
water and
bacterial
digestion is
still
happening
• Sludge is
taken off to
sludge drying
beds from
below.
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10. Sludge drying beds
• Sludge
makes a
good
manure
for
agriculture
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11. Liquid chlorine for disinfecting water
before discharge
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12. 2/16/2016 12