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TREATMENT OF SEWAGE BASED ON UASB PROCESS Contributed By Harish Kumar Surna JNTUHCEH, India. CIVIL SCHOLAR
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TREATMENT OF SEWAGE BASED ON
UASB PROCESS
Contributed ByHarish Kumar Surna
JNTUHCEH, India.
CIVIL SCHOLAR
U-UP FLOWA-ANAEROBICS-SLUDGEB-BLANKET
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CONTENTS
• INTRODUCTION• OBJECTIVES• PRIMARY TREATMENT• UASB REACTOR• AERATION• POLISHING POND• CHLORINATION SYSTEM• BY PRODUCTS• CONCLUSION
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UP FLOW ANAEROBIC SLUDGE UP FLOW ANAEROBIC SLUDGE BLANKET PROCESSBLANKET PROCESS
Up flow anaerobic sludge blanket process (UASB),was developed by Up flow anaerobic sludge blanket process (UASB),was developed by Lettinga and his co-workers in Holland in the early 1970'sLettinga and his co-workers in Holland in the early 1970's Anaerobic granular sludge bed technology refers to a special kind of Anaerobic granular sludge bed technology refers to a special kind of reactor concept for the "high rate" anaerobic treatment of wastewater.reactor concept for the "high rate" anaerobic treatment of wastewater.
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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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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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• 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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UASB REACTOR AT HMWSSB, AMBERPET,INDIA
CAPACITY 339 MLD
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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.
AERATION
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AERATED LAGOONWWW.CIVILSCHOLAR.COM
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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POLISHING POND IN STP AT HMWSSBWWW.CIVILSCHOLAR.COM
LAYOUT OF UASB TREATMENT PLANT
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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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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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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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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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![Dairy Industrial Wastewater Treatment Using (UASB) Reactor · ic sludge blanket (UASB) that developed by Lettinga et al, in 1979 [7] in Netherlands and has been widely used to treat](https://static.documents.pub/doc/80x56/5e7ab7af27433c1fb269b0d2/dairy-industrial-wastewater-treatment-using-uasb-reactor-ic-sludge-blanket-uasb.jpg)
