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I'm all up for trying that as well. Another thing is if the pH gets low enough to dissolve some Ca, Mg etc from the coral gravel, you got a calcium reactor. I have no idea if that's possible, maybe that requires an even lower pH.How about co2 injection to maintain an anoxic zone for denitrification.
Dyminco inject co2 straight into the substrate, computor controlled via the orp probeI'm all up for trying that as well. Another thing is if the pH gets low enough to dissolve some Ca, Mg etc from the coral gravel, you got a calcium reactor. I have no idea if that's possible, maybe that requires an even lower pH.
I've tested water before and after our calcium reactors, just to see if the NO3 is consumed in there, but didn't show any differences.
How to dissolve the CO2? A bubble a guess would just go through the sand up to the surface.
Yes I know about that. Visited the Rotterdam Zoo and saw the large experimental tank, the precursor of the Dymico filter. So they have been an inspiration for a long timeDyminco inject co2 straight into the substrate, computor controlled via the orp probe value. They originally believed that the calcium carbonate substrate would disolve & maintain alk & cal, but I think that supplimenting is still necessary.
I see the Dymico system has evolved quite a bit over the years. They now have a blue box version for systems as small as 200 litres.Yes I know about that. Visited the Rotterdam Zoo and saw the large experimental tank, the precursor of the Dymico filter. So they have been an inspiration for a long time
But I think they recirculated the plenum water with quite large pumps. So in that case it wouldn't be a problem to break up the CO2 bubbles.
My sketch is too low flow for that. But maybe it's possible to use an upside down bowl in the plenum so the CO2 stays.
/ David
Here's an idea I want to try more. I've tried it once but put a layer of Siporax in the bottom and it turned out Siporax release a lot of silicate in anaerobic conditions. So I had to stop it and havn't had the time or place to try it again. The idea is a box inside the sump, with inlet at the bottom. Water is pumped out from the top water layer. This way it's easier to know how much water goes through the sand bed, and it's easy to put pH and redox probes to see the numbers after the sand bed. You could also feed the sand bed with carbon source and regulate the dosage and flow with the pH and redox(maybe). Anyway, not easy to explain in text so I draw this in power point
I call it David's reverse deep sand bed, or just DRDSB
Absolutely. I think the flow could be improved, both like you write by recirculate water to the plenum and also think about how to spread the flow as much as possible over the sand bed. My sketch is just an idea, I'm sure it can be improved a lot.Refresh my thinking, if what I say is off alittle. First I think, you need to determine in relation to water movement how fast to move water, this can be determined by orp of course this done last when it's up and running . If going in my tank here's my add on's to this design. We know anaerobic starts, 1 cm at least from the surface. I would add a a pipe(s) in middle of anaerobic activity. Recirculate to bottom at plenum. To increase bacteria activity or from other end where water exits, or have water entering go thru coil piping to remove oxygen before entering plenum. That way anaerobic starts quicker. The water exiting my be 1-3 gallons an hour. My 2 cents
I'm not as dumb as I speak. For a Mexican/Jew. HeeheeAbsolutely. I think the flow could be improved, both like you write by recirculate water to the plenum and also think about how to spread the flow as much as possible over the sand bed. My sketch is just an idea, I'm sure it can be improved a lot.
Sorry @Subsea for hijacking your thread
/ David
So you would have a “carbon dosed” tank without having to carbon dose?My goal is to create the first (as I know) self playing denitrification system in aquaria (No need of external add of DOC). But it will take time.
How about co2 injection to maintain an anoxic zone for denitrification.
So you would have a “carbon dosed” tank without having to carbon dose?
I'm all up for trying that as well. Another thing is if the pH gets low enough to dissolve some Ca, Mg etc from the coral gravel, you got a calcium reactor. I have no idea if that's possible, maybe that requires an even lower pH.
I've tested water before and after our calcium reactors, just to see if the NO3 is consumed in there, but didn't show any differences.
How to dissolve the CO2? A bubble a guess would just go through the sand up to the surface.
The Dimico system uses this method to controll the oxygen level in the substrate so it is in an anoxic state (perfect for denitrifying bacteria), not anaerobic or oxic. An orp probe reading will give various readings depending on the level of oxygen in a given environment. The orp probe is connected to the Dimico computor as is the source of co2 injection.Help me understand why co2 injection.
I have a background of running an experimental waste water treatment plant (small - serving around 200 individuals - Stensunds wastewater aquaculture) between 1993 and 2000 and in construction of indoors recirculation fish farms with total nitrogen removal from the water.
Sincerely Lasse
I understand what you said. I do not understand why more co2 causes less oxygen.The Dimico system uses this method to controll the oxygen level in the substrate so it is in an anoxic state (perfect for denitrifying bacteria), not anaerobic or oxic. An orp probe reading will give various readings depending on the level of oxygen in a given environment. The orp probe is connected to the Dimico computor as is the source of co2 injection.
Good question; I don't believe it does.I understand what you said. I do not understand why more co2 causes less oxygen.