MBBR Tank Deph

Question

Hi Everyone what is the minimum tank depth for MBBR Reactor, all I can see is 3.5 meter minimum,  if possible I want to design a 2 meter or less for a small capacity MBBR reactor  to make it portable,  --- Cheers Frank..

David Russell · Answer

The tank depth is solely a function of the pressure of the aerators and the efficiency of the gas transfer.  You can run a SBR with shallow surface aerators, but it tends to be more work.  So, depth is not the driving issue.  Detention time and tank volume are more important for COD/BOD removal.  That said, you do have to have some mixing in the tank, but the details are up to you.  Curiously enough most systems in the US are designed with aerator depths of around 12 feet (3.7 meters) because that's the best pressure/delivery point for single stage compressors.

francisco delas alas · Answer

Hi Everyone, Thanks for the information.. Great help... cheers

leila goftary · Answer

Typically, each MBBR has a length-to-width ratio (L:W) in the range 0.5:1 to 1.5:1. Plans with a L:W greater than 1.5:1 can result in the free-moving plastic biofilm carriers being non-uniformly distributed throughout the bioreactor. As a result, the system is subjected to poor oxygen transfer efficiency and reduced hydraulic capacity of the plastic biofilm carrier retention screens.

Rajendrakumar Saraf · Answer

Once fine bubbles are generated by diffuse aeration, fine air bubbles travels upward. Longer the contact time better the oxygen transfer. Yes you can design the tank of 2 m depth.  However you may have to add more oxygen.

Kedarnath Chakradeo · Answer

Simply put,  more depth allows more oxygen diffusion but consumes more blower energy. Therefore, it's a trade-off and a depth of 2m - 4m is optimally maintained.

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