Published by francisco delas alas
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.
Published by David Russell, President at Global Environmental Operations, Inc
Hi Everyone, Thanks for the information.. Great help... cheers
Published by francisco delas alas
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.
Published by leila goftary, Employee at leila goftary
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.
Published by Rajendrakumar Saraf
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.
Published by Kedarnath Chakradeo
40+ years of experience in STPs: The only item You loose is the oxydation capacity as a cbm air gives certain amount of grams DO per immersion meter upto 6 to 7 m of depth. This is why
You loose in aeartion power consumption, only! Br AbuIlkka
Published by Paavo Vaittinen, Snr. Advisor at Finntreat Oy
Hi Francisco, there is not minimal depth, but it plays a significant role in the aeration. If you need a 2 m depth MBBR reactor, I can design it. nicolas@1h2o3.com
Published by Nicolas Meudal, Freelance Wastewater & Water Consultant
As far as i know, your tank dimensions depend on the amount of BOD/COD you want to remove which directly influences the amount of media volume needed. You have to provide enough volume to accommodate this media volume you selected.
Published by Vishnu Ravi Ram K, Environmental Engineer
Hello Vishnu , can you send some info on designing an MBBR for 1 million gallon of sewage waste water , lifemillion@yahoo.com
Published by Kevin Khan MTO Eng, PO Eng , TTI, Licensed Power Operations Engineer 1st Class , Licensed Technical Instructor ;
Hello it all depends on your offer: financial investment-processing volume. The cost will be virtually identical for a 3.5 that pure a 2, 0M3