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  #1  
Old 12-13-2006, 04:59 PM
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Have you checked the calcium level out of the 2nd stage? In theory, with the sulfer producing acid, this may be a replacement for the CO2 bottle in a calcium reactor, or a least be of some value for calcium replenishment even if the goal isn't NO3 reduction.
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Old 12-13-2006, 06:45 PM
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Not yet. Randy Holmes-Farley did this article about sulfur denitrators where he showed the chemical reactions happening and demonstrated how the calcium and alkalinity, although there will be some, won't really be a significant source for the tank. However I'm sure it's still better than having nothing.

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Originally Posted by reeferaddict
gradually ramped it up to around the 5X media volume turnover per hour as stated in Delbeek and Sprung Vol 3
How did you ramp it up? I'm still running about one drop per 2 to 3 seconds. Could I start opening it up at this point?

I don't have vol3 yet. I dropped a pretty big hint to Santa though.

So ...

5x media volume. I'm using a 4" reactor and my media height is approx. 8.5".

So roughly PI * 2^2 * 8.5 (Pi * r^2, where r=2 because diameter is 4") = ~107 cubic inches

1 cubic inch = 16.387064 millilitres

Therefore 107 * 16.387064 = approx. 1750ml

1750ml * 5 = 8750ml/hour

8750 / 60 = approx. 145 ml/min

That seems pretty fast to me. Am I overlooking anything or should it really be opened up that fast?

I guess that's only about 6 seconds to fill a 15ml measuring spoon. A little more than twice what I run my calcium reactors at (I run mine at 60ml/min) so I guess it's maybe not that far off. Hmmm ... interesting.

Ok so the real question is how much time do I give myself to open up the reactor to that speed?
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Old 12-13-2006, 07:37 PM
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Arggh math! My eyes!!!!!

I say damn the torpedoes! Full speed ahead!

Seriously though, that seems pretty fast, why not just try a fast drip for now, then ramp it up from there?
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Old 12-14-2006, 12:11 AM
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I don't think you want to be increasing your drip rate...

You want a slow drip rate until you have enough bacteria to use up all the nitrate at that rate. Then you start increasing your drip rate slowly until you find the right rate for your current bioload. As your nitrate in the tank comes down you will further increase your drip rate until it is balanced at Zero nitrate in the tank, and zero coming from the reactor.
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Old 12-14-2006, 12:13 AM
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2 weeks is too early to be jumping to conclusions and changing operation of your setup..
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Old 12-14-2006, 06:48 AM
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Be nice now. I'm not jumping to conclusions but I am questioning whether I should wait to see this thing help sort out an immediate situation I have right now.

3 months from now is practically March and that's a long way's away. Many things can happen in that timeframe.

As far as increasing the drip rate, I haven't. It doesn't make sense to me to start that until I see a NO3 reading on the output that's less than the input, because until then, there obviously isn't enough colonization to make the difference.
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Old 12-14-2006, 08:35 AM
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Sorry, I didn't mean that in a 'not-nice' way.

Personally I would give it another week to see if anything changes. You should show a lower nitrate level by then I would think. 3 months seems like an aweful long time.
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Old 12-25-2006, 05:46 AM
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Sorry to hear Tony, I had such high hopes that this would be the solution
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