Basic ​​calculations ​​for MBBR ​​technology for ​​domestic water

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Dear Colleagues.
I am currently ​trying to ​create basic ​calculations ​for MBBR ​technology for ​domestic water. ​The technological ​scheme I have ​chosen is:​
1. mechanical treatment
2.Anoxic tank
3.Aeration tank (MBBR)
4.Secondary ​settlement tank ​with lamellas.​
5.desinfection
SALR - 95%
I think to use ​recirculating ​nitrate flow ​from aeration ​tank and ​recirculation ​of activated ​sludge from ​secondary ​settlement. ​
In these ​technological ​scheme will ​there be a ​change in the ​size of bio ​media ? what ​media surface ​area (m2 / m2) ​to use ? ​
Thank you in advance
Best regards

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3 Answers

  1. Dear Mr atanassov

    You require to internal recirculation from aeration tank to anoxic tank for denitrification. Nitrification will be done in aeration tank .  fFor denitrification, microorganism require to anoxic zoon.

    But you don’t need to recirculation ​​of activated ​​sludge from ​​secondary ​​settlement to aeration because surface media (moving bed) will be kept concentrate of MLSS in aeration Tank.

     ​​size of moving bed will be  selected from vendors catalogue for example Kaldness .

    good luck. 

     

    1 Comment

    1. Thank you for the respond. But I am confused. In this case (that you told me) how much will be the concentation of active sludge in aeration tank ? And how much is the quantity of the SAS compared to conventional water treatment technology ? 

  2. You have the assumption that you have sufficient Phosphate and Carbon for the bacteria to live.   I set up a system where the main food source was Carbon with no nitrogen and no phosphate.  All living organisms must have all three.  We used urea and phosphoric acid mixture along with air injection and  a small injection pump to feed the bugs; it was very successful. Without the nitrogen and phosphate, the bugs just will not grow. 

  3. Rossen, a municipal sewage treatment in North East China, using 12,5 vol.% of  high performance, adsorbent LEVAPOR biocarrier (www.levapor.com) in the aerobic reactor achieves at 2,2 to 2,5 kgCOD/m³*d also during six months at low temperatures a full COD removal and nitrification.