TREATMENT OF SEWAGE BASED ON UASB PROCESS. Up flow anaerobic sludge blanket process (UASB),was developed by Lettinga and his co-workers in Holland in the early 1970's Anaerobic granular sludge bed technology refers to a special kind of reactor concept for the "high rate" anaerobic treatment of wastewater. The major objectives of the UASB process is: Pre sedimentation anaerobic wastewater treatment and final sedimentation including sludge stabilization are essentially combined in one reactor making it most attractive high-rate wastewater treatment option. To produce by products like Methane enriched biogas and nutrient rich sludge.

1. TREATMENT OF SEWAGE BASED ON
UASB PROCESS
Contributed By
Harish Kumar Surna
JNTUHCEH, India.
CIVIL SCHOLAR

2. U-UP FLOW
A-ANAEROBIC
S-SLUDGE
B-BLANKET
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3. CONTENTS
• INTRODUCTION
• OBJECTIVES
• PRIMARY TREATMENT
• UASB REACTOR
• AERATION
• POLISHING POND
• CHLORINATION SYSTEM
• BY PRODUCTS
• CONCLUSION
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4. UP FLOW ANAEROBIC SLUDGEUP FLOW ANAEROBIC SLUDGE
BLANKET PROCESSBLANKET PROCESS
Up flow anaerobic sludge blanket process (UASB),was developedUp flow anaerobic sludge blanket process (UASB),was developed
by Lettinga and his co-workers in Holland in the early 1970'sby Lettinga and his co-workers in Holland in the early 1970's
Anaerobic granular sludge bed technology refers to a special kindAnaerobic granular sludge bed technology refers to a special kind
of reactor concept for the "high rate" anaerobic treatment ofof reactor concept for the "high rate" anaerobic treatment of
wastewater.wastewater.
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5. OBJECTIVES
The major objectives of the UASB process is:
• Pre sedimentation anaerobic wastewater treatment and final
sedimentation including sludge stabilization are essentially
combined in one reactor making it most attractive high-rate
wastewater treatment option.
• To produce by products like Methane enriched biogas and
nutrient rich sludge.
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6. PRIMARY TREATMENT OF SEWAGE
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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7. • 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.
UASB PROCESS
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8. UASB REACTOR AT
HMWSSB, AMBERPET,INDIA
CAPACITY 339 MLD
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9. • 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.
AERATION
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10. AERATED LAGOON
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11. POLISHING POND
• Polishing ponds are used to improve the quality of effluents
from efficient UASB reactors, so that final effluent quality
becomes compatible with desired standards.
• It is mainly used to improve the hygienic quality.
• Polishing pond with baffle walls to increase the length of flow
with a DT of 12hrs, where any remaining suspended solids are
reduced to less than 50 mg/L.
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12. POLISHING POND IN STP AT HMWSSB
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13. LAYOUT OF UASB TREATMENT PLANT
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14. CHLORINATION SYSTEM
• Chlorination system has been given in the system in the design
to meet the fecal coli form standards.
• It includes mainly of three units:
1. Chlorine house.
2. Chlorine mixing tank and.
3. Chlorine contact tank.
• The water which is mixed with chlorine is free from harmful
bacteria therefore effluent is pumped into nearby water body.
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15. BIOGAS:
•Floating type gasholders will be
provided in a concrete tank.
•Gas coming from pipe consists of
Methane,CO2,H2S.
•Only methane is used to generate
electricity.
SLUDGE:
•Sludge produced from the USAB
reactor will be digested sludge and
rich in nutrients which are
beneficial for plant growth.
BY PRODUCTS
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16. ADVANTAGES
The following are the advantages of UASB:
• 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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17. CONCLUSION
• Compare to other treatment plants UASB has capital,
operation and maintenance cost minimum.
• Uses waste to generate power.
• Treats the raw sewage and releases treated water to maintain
river ecology.
• Turns waste water into water fit for irrigation.
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18. THANK YOU
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