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Unread 01/01/2018, 04:03 PM   #7
Belgian Anthias
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Join Date: Oct 2009
Location: Belgium
Posts: 608
By providing additional carbohydrates a cycle is created from NH4 to NH4. Only +- 30% of the cultivated biomass will be removed by a skimmer. http://www.baharini.eu/baharini/doku...iwitafschuimer. The rest must be consumed. it becomes part of the food cycle.
To reduce 1 g NH4-N, +- 8 g protein is produced, the equivalent of 20 grams food containing 30% protein. When the produced protein is consumed some is used to increase the total bioload but most of it will be released as ammonia and a bit ureum. To reduce 1gram nitrate by assimilation also 0,1gram phosphate is needed. http://www.baharini.eu/baharini/doku...onium_reductie This may become an issue in biopellet reactors.
Once regular dosing carbohydrates, most of the dose is used to remove ammonia which is the result of previous doses.

It must be clear that when additional carbohydrates are provided this must be taken in account for the total food supply. A refugium can be added to help consume the produced bacterial biomass by organisms which may be used as a food souce.
It must also be clear that when the organic carbon supply is interrupted biomass will decay. Organisms which depend on it will die. On that moment nitrification capacity will be insufficient .

Heterotrop ammonia reduction produces a lot of biomass, 40x more as nitrification. This is done every cycle from NH4 to NH4. It is a fact that +- 2% of the bacterial biomass will be lost as it is not recyclable and will be left as detritus.
The growt may also become an issue when biofilters or DSB are used. They may clog. But at a high maintained C:N ratio these filters are not needed.



Last edited by Belgian Anthias; 01/01/2018 at 04:19 PM.
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