Design for a flat bottom sludge blanket clarifier

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Can someone guide me on the process design for a flat bottom sludge blanket clarifier for a municipal drinking water treatment plant?

Much appreciated!

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8 Answers

  2. Is the objective to treat the sludge from the decanter?

  3. Why flat bottom? I'm curious about that. Typically, a design like this uses an upstream clarifier. Is the turbidity too high? Tell me what has been defined.

    2 Comments

    1. We are designing a water treatment plant of 216 MLD capacity wherein the client is insisting on flat bottom sludge blanket clarifiers with mechanical scrappers

      9 Comment replies

      1. Tell me what has been defined.

      2. Convince your customer to give up this option

      3. In this case is to better to use 60 m3/m2/day to calculate the section of the filters if money s not problem.

      4. Mechanical structures is ever one more problem so, manutention is necessary and expensive

      5. Using a upstream clarifier you can use, too, a sludge treatament in separate. 

      6. The turbidity is small or medium so, you can use an upstream clarifier. The Filter washing water is the problem due to the high volume. But if this is not a problem I would prefer this.

      7. There is a impediment to use flat bottom? Rock or other thing

      8. I think that you have to use a sludge treatment in separate

      9. If I understood you will need a conventional treatment.

    2. The turbidity is peak season 90 NTU

  5. There are a variety of sludge blanket clarifiers. Each has their own nuance for using the sludge to aid in treatment, I would source information from the various vendors, as there are Pulsator, Actiflo, et. al. Great place to start is with vendor technical literature available online and then develop matrix of the differences and similarities then determine which would most closely fit your process requirements based on the wastewater characteristics for your project.

  7. French English

    Bonjour je pense que dans votre cas la mise en place de 3/4 bassins à déverse serait plus approprié. Chaque bassin retiendra une partie des matières en suspension qui seront de moins en moins nombreuses en sortie du dernier bassin qui lui filtrera l'eau en débordement. La récupération des boues se faisant pas suceur 

    Hello I think that in your case the installation of 3/4 overflow basins would be more appropriate. Each tank will retain a part of the suspended matter which will be less and less numerous at the outlet of the last tank which will filter the overflowing water. The recovery of sludge by not sucking

  8. The flat bottom presents a challenge, and will then require the installation of scrapers to concentrate the sludge to a sump where it can be removed.  By installing a suspended sludge concentrator cone at the level of the sludge blanket, you can design to remove 90% or more of the sludge from the suspended cone.  I have tried to attach two standard design options - one with scrapers and one with a suspended cone.  You will probably need to incorporate both concepts into your design.

    2 Comments

    1. Hi Ian, thanks. The resolution is a bit hard to read. Much appreciated if you could upload a higher resolution version. Thanks