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2. U-UPFLOW
A-ANAEROBIC
S-SLUDGE
B-BLANKET
REACTOR
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3. The major objectives of the UASB process is:
•
• Pre sedimentation anaerobic wastewater treatment and final
sedimentation including sludge stabilization are essentially combined in
wastewater treatment
one reactor making it most attractive high-rate
option.
To produce by products like Methane enriched biogas and
sludge.
nutrient rich
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4. 1.The inlet chamber will receive the raw sewage to pass to screen channel
and subsequently to the detritor tank.
2.In screen channel floating matters are trapped and removed.
3.In detritor tank grit is removed.
4.Now the sewage having been treated for screening and grit is then
passed to UASB reactor.
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5. •
•
•
•
UASB reactor is the place where the separation of gas, liquid and solids
takes place.The reduction of BOD is 75%.
In this process the whole waste water is passed through the anaerobic
reactor in an up flow mode with HRT of 8.8 hours.
The up flowing sewage itself forms millions of small granules of sludge
which are in suspension and the excess sludge is removed and taken to
sludge pump house.
Organic compounds get anaerobically biodegraded converting it into
methane enriched biogas.
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8. UASB REACTORAT HMWSSB,AMBERPET
,INDIA
CAPACITY 339 MLD
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9. •
•
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The flow from UASB rector will be directed to aerated lagoon to provide
aeration and allow further settlement of suspended solids of the effluent
from UASB reactors.
This aerator provide the oxygen to be decomposed along with water by
providing huge surface area.This resulting induction of oxygen reduces
the BOD load by further 75%.
Detention period is 24hrs.
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10. AERATED LAGOON
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11.  Organic Loading Rate
 Nutrients
 Hydraulic Retention Time
 Volatile Fatty Acids
 Operational T
emperature
 Operational pH
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12. ⦁ Organic loading rate (OLR) is an important
affects the performance of a UASB reactor.
parameter that considerably
⦁ The fluctuations depends on sludge properties, mixing intensity, Sludge
retention time, Hydraulic retention time, Bacterial mass
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13. ⦁The growth of anaerobic microorganisms depends on the availability of the
essential nutrients present in the wastewater.
⦁Deficiency of these nutrients could negatively affect their growth of
microbes and also the efficiency of the anaerobic degradation.
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14. ⦁ The hydraulic retention time (HRT) is defined as
wastewater spends inside the reactor.
the average time that
⦁ HRT is affected by both the flow
entering the UASB reactor.
rate and composition of wastewater
⦁ High HRT increases the contact time of wastewater with the sludge and
hence improves the effluent quality and biogas production rate.
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15. ⦁ Volatile fatty acids are important intermediate
of CH4.
products in the formation
⦁ The right concentration determines the efficiency of substrate removal
from the reactor.
⦁ For a typical reactor, overloading, or sudden variations in HRT and OLR
could cause the accumulation of VFA and stressful conditions in the reactor
during the break down of complex organic matter.
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16. ⦁ Operational temperature is an important
degradation processes.
parameter in anaerobic
⦁ It determines the dominant bacterial flora and the growth rates of
microorganisms present in a reactor.
⦁ Different species of bacteria can survive at
ranges.
different temperature
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17. Block Diagram
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18. ⦁ Produces easily de-water able excess sludge.
⦁ Low energy consumption.
⦁ Absence of noise and odour nuisance.
⦁ Proven technology.
⦁ Low initial investment and maintenance cost.
⦁ Methane rich biogas production.
⦁ Production of enriched nutrients sludge.
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19.  Low pathogen and nutrient remover
 Long Start-up
 Possible bad odors
 Necessity of post-treatment
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