UASB is anaerobic Process & ...

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UASB is anaerobic Process & MBBR is aerobic combination of suspended growth process. You have to calculate total organic load on Kg/day from COD/BOD and total flow.

For MBBR Retention time varies from 6 to 8 hr. Media added is around 20 to 30% of total volume of aeration tank.

Oxygen is calculated from total BOD load per day. For example BOD is 200 mg/l. This is equivalent to 0.2 kg / Cum.

For 500 cum of waste water total BOD load will be 100 kg/day

Oxygen supply is consider as 1.5 to 2 Kg of BOD applied. From Total Oxygen required air volume is calculated. This gives air flow required from the air blower.

Heart of UASB is the formation of sludge blanket in the reactor. Sludge is kept is blanket form by the upward velocity of waste water added from the bottom. it is difficult to explain all the steps of calculation. However for details you can contact me with the details of Waste water.

Rajendrakumar V Saraf

 

 

1 Comment

Thank for your enthusiasm

COD and BOD concentration is not stable. it considers as 800 - 15.000 mg/l for COD and 500 - 10.000 mg/l for BOD. the capacity in range 100 - 500 m3/day. I want to know the way design UASB and MBBR to control COD load. Example: for Q=100m3/day, COD = 15.000. I will adjust flow of waste water at inlet of UASB.
Please give me detail method via email, hdh24886@gmail.com

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