Results 1 to 8 of 8

Thread: Denitrification filter?

  1. #1
    Senior gr81's Avatar
    Join Date
    Oct 2005
    Country
    Czech_Republic
    Posts
    812
    Thanks
    10
    Thanked 36 Times in 28 Posts
    Images
    7

    Default Denitrification filter?

    Hi,
    Did you try build deni. filter (filter where NO3 is reduced to N2). Can It be home made? I'm looking for some good step by step guide how to make it....

  2. #2
    gorilla83
    Guest

    Default

    yea i think...

    probably it's related to "trickle filter" or "wet-dry filtration"...
    maybe you could try an online search
    Last edited by Robert; 22nd Apr 2006 at 12:31 AM.

  3. #3
    Moderator silane's Avatar
    Join Date
    Feb 2005
    Country
    Singapore
    Location
    Eastern
    Posts
    2,294
    Thanks
    19
    Thanked 236 Times in 192 Posts
    Images
    359

    Default

    Quote Originally Posted by gr81
    Hi,
    Did you try build deni. filter (filter where NO3 is reduced to N2). Can It be home made? I'm looking for some good step by step guide how to make it....
    The concept is quite simple, first have to deplete Oxygen (anaerob conditions), then the denitrify bacteria will grow.

    Use a large PVC tube, fill lot of bioball, force water through it, then through a long coil (20m or more) of air tube, the water out to your tank. Water flow has to be slow through the system.

    Heard that there is a commerical system that use Nitrogen to displace Oxygen in the water, not sure how in works in detail, but you may want to work around this concept.
    Last edited by silane; 22nd Apr 2006 at 12:39 AM.

  4. #4
    gorilla83
    Guest

    Default

    oops.. sorry think i got the wrong idea...
    ignore my previous post

  5. #5
    Senior gr81's Avatar
    Join Date
    Oct 2005
    Country
    Czech_Republic
    Posts
    812
    Thanks
    10
    Thanked 36 Times in 28 Posts
    Images
    7

    Default

    I found plans for DIY denitrator using coil and bioballs. Question is what is that Bioballs. I found Bioballs from Aqua Medic, which are plastic balls. But "profi" denitrator uses extra feeding for bacteria. some using ethanol, some sulfur, some Deniballs. All of these are expensive. So DIY low cost solution for not much exposed shrimp tank should be DIY coil denifilter with bioballs. But as I wrote above, question is if that Bioballs are really only plastic balls or contain some feeding for bacteria. If is it only plastic , then probably any other type of biomedia should be used.

  6. #6
    Moderator silane's Avatar
    Join Date
    Feb 2005
    Country
    Singapore
    Location
    Eastern
    Posts
    2,294
    Thanks
    19
    Thanked 236 Times in 192 Posts
    Images
    359

    Default

    Let me explain in a better way:

    The first step: you can use ANY bioball or bio medium that aerobe bacteria can grow on, so that aerobe bacteria will deplete the O2 and create an anaerobe condition.

    The second step: channel the anerobe water through a long tube slowly, where anaerobe bacteria grow, they take in NO3 to respire organic matter, thus freeing nitrogen.

    Not too sure if sulphur bead is used in fresh water, but marine.

    Ethanol is used as carbon source for denitrifying bacteria, you can use sugar solution too.

  7. #7
    Senior gr81's Avatar
    Join Date
    Oct 2005
    Country
    Czech_Republic
    Posts
    812
    Thanks
    10
    Thanked 36 Times in 28 Posts
    Images
    7

    Default

    Oh, I thought that long tubes are used to deaerate watter. and on bioballs grow anaerobe bacteria...

    Sugar feeding... that sounds good. Bud I never heard it before. How do you think it? put sugar directly to water? What will suggar do with tank water quality? How much of sugar to use? Some experiences?

  8. #8
    Member
    Join Date
    Jul 2006
    Country
    Sweden
    Location
    Karlstad, Sweden
    Posts
    22
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default

    Quote Originally Posted by gr81
    Oh, I thought that long tubes are used to deaerate watter. and on bioballs grow anaerobe bacteria...
    You are correct. In a coil denitrator slow watermovement through the long hose deaerates the water and anaerobe bacteria grow on the bioballs. I'm sure however that it's posiible to run it the other way but I think that will be more unstable. Coil denitrators are dangerous things, if both O2 and NO3 is depleterd bacteria will use sulphur compunds instead producing toxic hydrogen sulfide, H2S. This can be remedied by vigorous aeration of the output water.
    The denitrator also needs to be cycled. It's a biological filter and the bacteria need time to grow. Many aquarists have failed with coil denitrators.
    Good luck anyway!
    //Mattias

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Difference of using hang-on filter and sponge filter
    By Bocca in forum Equipment & D.I.Y.
    Replies: 23
    Last Post: 15th Sep 2008, 01:26 AM
  2. What kind of filter should I use?
    By sonicscape in forum Crystal Red Shrimp
    Replies: 3
    Last Post: 30th Nov 2007, 10:32 AM
  3. Undergravel Filter
    By twitch in forum Equipment & D.I.Y.
    Replies: 1
    Last Post: 23rd Jul 2007, 07:14 AM
  4. UV Canister Filter
    By stardust0012 in forum Crystal Red Shrimp
    Replies: 9
    Last Post: 13th Jul 2007, 12:33 AM
  5. Which kind of filter?
    By Claudio Cabral in forum Tank Setup
    Replies: 1
    Last Post: 3rd Apr 2006, 01:13 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •