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02/18/2010, 10:38 AM | #276 |
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re: LaCl2 & 03
I can't help you with this one, cap- sorry!
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02/18/2010, 06:58 PM | #277 | |
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That is a great question! I can tell you that those reactors, along with the long contact time and the polishing filter sock, would be an ideal way to dose lanthanum...but I have no idea what kind of interaction the La+ and ozone would have in such high concentrations. That's a good question for Craig, William, or Randy. I'll try and take a photo of our big sand filter dosing system this weekend. The sand filter normally processes something like 900gpm but we've dialed it down to 90gpm for the lanthanum dosing. From past usage we know that it takes a considerable amount of time for the lanthanum to react with phosphate so we don't want to flush it through the filter too fast. We use a peristaltic pump to add the diluted lanthanum to the pressure side of the sand filter pump. We dose the lanthanum at the tail end of the backwash cycle so that the filter is nice and clogged and pulling out the finest particles. |
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02/18/2010, 07:02 PM | #278 | |
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When you say you inject the lanthanum into the filter, are you pumping it into the intake side of the filter hose? What kind of flow through the filter do you get when you first turn it on? |
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02/18/2010, 09:37 PM | #279 |
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I run the tube from the syringe pump into the inlet tube of the diatom filter. The output of the vortex xl filter is approximately 400gal/hr, so for my setup it's just the right speed. I think a diatom pool filter would work better for your larger displays, and would not clog before the job was finished. You might even want to construct your own.
I noticed that you said it takes time for the lanthanum and phosphate to react and you dialed down the sand filter. This has given me an idea. The vortex filter has a small glass bell jar that holds the filter pleat and diatom powder. It must have a volume of only about a gallon or two. Now I am thinking of constructing a reaction chamber for the water and lanthanum to mix in before passing through to the vortex filter. This would provide a little more time for the reaction to take place, and might be more effecient.
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02/18/2010, 11:11 PM | #280 | |
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Your brain and mine must work the same... We just started dosing lanthanum on small systems and the way we've been doing it is to drip diluted lanthanum into the overflow box and catch the entire tank's contents in a 10 micron filter sock at the sump. This seems inefficient to me as we're prematurely clogging the sock with all the other detritus, fish waste, etc that comes along with the system water. Creating a small side stream seems like it will make for far less maintenance of whatever mechanical filter we choose to use. I was thinking of building something much like a simple calcium reactor type chamber, with an injection of lanthanum rather than CO2. It needn't be complicated or pressurized, even a 5 gallon bucket would work. The part that matters is a very slow turnover of tank water, say one or two tank turnovers per day, to allow the lanthanum to do its job before getting back into the system. I imagine some lanthanum carbonate will fall out of solution and end up at the bottom of the chamber if the flow through is slow enough. Then I would send the effluent through a 1 micron filter bag, or into a diatom filter if the system were large enough. One concern with this might be that with such a small volume you could easily bottom out the phosphate and be sending free La+ ions out with the effluent--I would want to regularly test the effluent for phosphate to assure that it was much lower than the incoming water, but not below a certain threshold (say 0.05-0.10 ppm). Hope this makes sense, thank you for the ideas and help brainstorming! |
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02/19/2010, 06:42 AM | #281 | |
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02/19/2010, 06:45 AM | #282 |
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02/19/2010, 08:10 AM | #283 | |
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I am way out my league here, but this is how I learn , but if there are no phosphates left in the system will the Lanthanum bond with more carbonate thus dropping ALK more?
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02/19/2010, 09:11 AM | #284 |
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I think what we really need is a lanthanum calculator. This would be an equation that we plug in the water phosphate level, the total tank volume and the percent lanthanum solution being used. It would then give us the approximate amount we would need to dose to do the job. We should ask Randy or another whiz on the chemistry forum to make one up for us so we can better dose our systems and lower the chances of free lanthanum getting into the tank.
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02/19/2010, 09:19 AM | #285 | |
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02/19/2010, 09:36 AM | #286 | |
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But I'd love to hear what Randy thinks about the calculator. |
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02/19/2010, 09:41 AM | #287 | |
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02/19/2010, 10:35 AM | #288 | |
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The problem I'm running to with the ractor idea is that the way I see it you want a HIGH turnover of tank system water through it to make sure all the LaCl reacts and precipitates, but a reactor that also allows the precip to settle out allowing collection, but that requires a SLOW flow rate. The LaCl calculator would be cool, but chemically it doesn't balance in real life, so not sure how umbalanced it gets at the lower levels of phosphate. |
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02/19/2010, 10:46 AM | #289 |
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A calculator would not be exact, but would at give us an approximation and something to start with. Further, you could use that number conservatively, and make sure you dose well below it. Right now it's just a shot in the dark.
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Paul Dec 08 TOTM Current Tank Info: Envisions 427gal |
02/19/2010, 11:03 AM | #290 |
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No calculator for the guinea pigs We are the calculators. OOO he wiped his entire tank out, I guess that was too much...
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02/19/2010, 01:21 PM | #291 | |
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02/19/2010, 03:49 PM | #292 | |
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over 24 years experience with multiple types of marine aquarium systems *see Upstate Reef Society Forum on RC and FB* GOOGLE JUNIOR'S REEF Current Tank Info: 84x24x30 265g reef past TOTM honors |
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02/19/2010, 04:28 PM | #293 | |
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02/19/2010, 07:04 PM | #294 |
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02/19/2010, 10:38 PM | #295 | |
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02/20/2010, 05:28 PM | #296 |
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I didn't!
but I'm expecting to hear about someone who misused this treatment. You know... the 'two aspirin are good so the whole bottle must be better' types.
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over 24 years experience with multiple types of marine aquarium systems *see Upstate Reef Society Forum on RC and FB* GOOGLE JUNIOR'S REEF Current Tank Info: 84x24x30 265g reef past TOTM honors |
02/20/2010, 06:32 PM | #297 |
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i do know the type....lol.
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“Sometimes it's necessary to go a long distance out of the way in order to come back a short distance correctly” ~ Edward Albee, The Zoo Story |
02/20/2010, 06:32 PM | #298 | |
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02/20/2010, 07:45 PM | #299 | |
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02/20/2010, 11:57 PM | #300 |
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nothing on O3 and LaCl yet frrm the pro's.
Chem makes my head hurt, so Randy HF posting on a Q of mine would just make my head just go POP...... I'd like to hear his or others thoughts on the chemical balance of the LaCl reaction since it isn't 1:1 as it should be. What else is reacting in our mix that we aren't expecting? |
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