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Old 02-28-2011, 03:46 AM   #1
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Aerobic Denitrification With Vodka Dosing??

Been reading many articles on Vodka dosing lately. Sounds succesfull. I am to understand that the chemistry is as follows:

If O2 is present, The O2 and carbon source (Vodka) are consumed.

However, If no O2 is present then Nitrate (NO3) and Carbon source are consumed. Nitrogen gas is produced.

This seems to imply that an anerobic sand bed or other anerobic condition would be required for vodka dosing to produce the desired result.

However, I have read posts that state people who have DSB may have to wait longer for the backlog of waste trapped in the sand to be consumed.

To me this implies in some cases there was no DSB...or any sand bed at all??

I have also read statements to the effect of "My next sump won't have a DSB".

So my question is...Can I have vodka dosing to remove nitrates without any kind of sand bed or anerobic enviroment at all?
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Old 02-28-2011, 09:19 AM   #2
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I have never tried it but I did find this in my links. Dont know if it helps or not.

Vodka Dosing by 'Genetics' and 'Stony_Corals' - Reefkeeping.com
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Old 02-28-2011, 09:42 AM   #3
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i have heard multiple times that it does eventually cause cyanobacteria outbreaks
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Old 02-28-2011, 10:29 AM   #4
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i've used vodka with success. i use it on a tank i maintain at a local gym. the water is crystal clear and a recent dinoflagellates outbreak was all but wiped out by it in just about a week. the corals look healthier, and the purple valida that has been there since the beginning has gained a lot of color.
the sand bed is 2" for aesthetics.
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Old 02-28-2011, 11:17 AM   #5
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Yes, But do any of you have Sand beds in these systems or are there no sand beds? I'm trying to find out if I can eliminate a sand bed all together.
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Old 02-28-2011, 04:54 PM   #6
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a 2" sand bed is going to give you zero denitrification. it's the same as no sand bed, from a nutrient reduction standpoint.
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Old 02-28-2011, 06:40 PM   #7
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If I were to use sand for anything, I would use a "fluidized" system. I have never had any luck with just plain sand. I do use a crushed shell bottom in my reef tank for buffeting alkalinity, but not to reduce any organics.
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Old 02-28-2011, 06:54 PM   #8
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Can you explain what a fluidized system would be in regards to the sand bed?
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Old 02-28-2011, 07:04 PM   #9
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Yes, in a fluidized sand filter, a very fine grain sand is used and a pump pushes water from the bottom of the column to the top, keeping the sand particles suspended. This provides an immense amount of surface area for bacteria to form, making these filter very efficient. They are available on line and are quit inexpensive.
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Old 02-28-2011, 07:35 PM   #10
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the crushed shells at the bottom of the tank trap detritus. i guess you are vacuuming the bed on a regular basis. i like to use the aragonite sand to do the same thing without the maintenance. fluidized bed filters were popular a few years ago, but i'm not sure they were considered "very efficient".
they don't convert nitrate. they tend to build up nitrates from what i remember. i think they were more popular in a fresh water, planted tank application.
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