DIY Sulfur Denitrator

Ok...I decided to try a SR out to get rid of my 15-25ppm nitrate problem that I have not been able to clear up. I built the unit yesterday using CPVC and a PM SR45 fludised reactor I had laying around (I think its 4" round by 18" high). Just waiting for my NO-NO3 and maxijet 1200 to show up. I had the extra volute from an old MJ so I could piece it together in advance.

what do you think?
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I like it, very tidy. The only issue that I see is that the pump inlet may need an extension tube put on it (can't tell if one is there) so that it does not suck in the gas that is produced. However, now that I think about it, I don't think the pump will work as positioned. It won't self prime, though you may be able to overfill it, but it will be difficult to get all the air out.

Todd
 
Yes the inlet to the pump goes down a bit further and the tube for the gas release is flush with the lid.

I have thought about the priming issue...it should be able to prime (think sticking the end of the pump input to the surface of water......but if it doesnt I'm prepared to prime it by sucking on the hose to get all the initial air out or I could use a feed pump or aqalifter to fill it with water. After that it should be good to go.
 
<a href=showthread.php?s=&postid=13783746#post13783746 target=_blank>Originally posted</a> by dvanacker
Well then you are degassing the unit into your tank.

What if you set the outlet tube so it would drip into your sump. Then the gas could just be released without going into the tank. Would that work? I am just trying to figure out a way to make one without having to degass it everyday.
 
problem is the recirc pump will be mixing the gas and water constantly....not sure you would want that.
 
What kind of gas does it cause? Is it something that if you dripped over carbon that it would clean it out?
 
It produces hydrogen sulfide gas I think. I'm not a pro (just built mine) but its the gas that smells like eggs.
 
Any issues running the feed pump to the denitrator then the output to a calcium reactor which drips into the tank? That would reduce the amount of CO2 I would need to lower the ph in the calc chamber.

I have this DIY and read a lot but not all 57 pages of this thread. :)
 
<a href=showthread.php?s=&postid=13786882#post13786882 target=_blank>Originally posted</a> by dvanacker
It produces hydrogen sulfide gas I think. I'm not a pro (just built mine) but its the gas that smells like eggs.

dvanacker & fare.........No, no the gas it produces, as it cycles down the Nitrates towards Zero, is harmless Nitrogen. It is possible to get H2S later in the use, as the flow becomes to low for the amount of Nitrates your converting to Nitrogen, ect...you then have several options: speed up flow rate, monitor for Nitrate to set flow rate, reduce the amount of sulfur in the SR ( "maintanance mode") or of course remove from the system.

Remember guys to watch carefully your ALK and pH as denitrification with sulfur will lower these so be aware !!!!

fareforce.....I'm not or it's not 100% clear on your return line, the effluent out, could you post a couple more shots, maybe a side view of your SR..??? If it'e what I think it maybe difficult to control flow rate (drops per sec.) as you cycle the way it's setup..

Dick
 
<a href=showthread.php?s=&postid=13787063#post13787063 target=_blank>Originally posted</a> by saltydog64
dvanacker & fare.........No, no the gas it produces, as it cycles down the Nitrates towards Zero, is harmless Nitrogen. It is possible to get H2S later in the use, as the flow becomes to low for the amount of Nitrates your converting to Nitrogen, ect...you then have several options: speed up flow rate, monitor for Nitrate to set flow rate, reduce the amount of sulfur in the SR ( "maintanance mode") or of course remove from the system.

Remember guys to watch carefully your ALK and pH as denitrification with sulfur will lower these so be aware !!!!

fareforce.....I'm not or it's not 100% clear on your return line, the effluent out, could you post a couple more shots, maybe a side view of your SR..??? If it'e what I think it maybe difficult to control flow rate (drops per sec.) as you cycle the way it's setup..

Dick

I will have to build mine first. That was a picture of someone elses that I photoshoped to make it look like mine will.
 
<a href=showthread.php?s=&postid=13786962#post13786962 target=_blank>Originally posted</a> by ChrisOzment
Any issues running the feed pump to the denitrator then the output to a calcium reactor which drips into the tank? That would reduce the amount of CO2 I would need to lower the ph in the calc chamber.

I have this DIY and read a lot but not all 57 pages of this thread. :)

Chris,

An excellant idea, as the amount of ARM in or on top of the SR does help (a little), but running into your C reactor is a great idea.....As I think about it a liitle more, does your input of CO2 cause any sort of pressure in CO2 reactor ???( I have never used one so I'm really not the best source on that), but if it did it could cause issues with FR (flow-rate) thru the SR....

One other thing we can do with the effluent line is to run it into our skimmers (my EV-120 has a fitting just for that) it seems that strong airfication helps to "oxidize" H2S ( I don't want sound like a chemist here, jeez I hated chemisry in school :mixed: :mixed: ) none the less just my 2 cents....

Dick
 
CO2 input is off the calc reactor recirc pump so no back pressure there. In fact the recirculating pump will help bring the denitrator water in and through the calc media.

The drip rate for both is relatively the same - ~1 drip per second.

The negative I can think of is the fact that you can't change the drip rate of either device without affecting the other. I was curious if anyone has tried it and what the results were.
 
need some building help

need some building help

I have been working on my SD this weekend.
A Q for you all..... on top the the course aragonite (or ARM), what is the purpose of the strainer many projects seem to utilize on the output to the recirc pump? If it is to protect the pump from small grains getting in, wouldn't a final layer of course (black) filter material serve the same purpose and save the trouble of drilling all those holes in the 1/2" pipe?
Lastly, how much higher than the recirc return does the affluent output hole have to go?
I'm getting there.... I will wait for answer to above Qs to finish. I should have it finished and water tested before Thanksgiving. However, as I will be OOT till Sunday nite, won't actually fill it with media and saltwater and fire it up till then.
I will post some pics of the finished project -- not as fancy as most recent posts, but should do the trick........... MARC
 
another question I thought of.....

another question I thought of.....

When testing my SD, will running dechlorinated tap water to/from it from a bucket be sufficient to test for leaks, or do you have to test it with the media in (to cycle it and build up gas) and keep your fingers and toes crossed and hope for no leaks?
My plan was to fill a 3-5 gal bucket, put it on my garage work counter, feed water to unit on cement floor of garage, and keeping the output fully open back to the bucket, let it run for a while. This would put water level at about the level of my tank, and the denitrator at about the level it would be next to and below the tank...........marc :rollface:
 
question for DJ and the crew...

I'm a bit confused on the amount of media to put in my SD.
On page 14 of the thread one part says to use 1% sulphur/vol tank. While Dj also says to use 1.5L/250gal.
I have a 65 gal tank with ??? water.... lets say 50-60 gal of water.
1% would be about 1.9-2.2L or about 1/2gal (or so) of sulphur (1/2 of the container of LSM). But, 1/4-1/5 of the 1.5L/250gal method would be .3-.4L or only about 1/10 gal of sulphur media. This seems to be a VERY big difference!

I don't want to over-sulphur, and have to take the whole thing apart later as my nitrates drop, on the other hand if I put in the lower amount (which seems to be very little media), will there still be enough sulphur for a good reaction to occur?

Also, does the amount of course aragonite matter? Since I'll have plenty of room left inside my chamber, using either of the above sulphur calculations, should I simply fill the rest of the remaining space with Arag? -- it would seem by reading through the thread that the aragonite buffers out the pH, alk, and Ca levels, so it would seem that you could never have too much aragonite in the chamber.

I'm almost ready to put the media into my SD, so these responses are REALLY needed to get me finished, tested, and up and running.

Thanks to everyone for the help ............ marc
 
All done (except for testing and media)

All done (except for testing and media)

While I’m waiting for a response to my media volume question, I figured I’d post my denitrator. It is a variation of jwaltman’s unit.
Parts used were:
1 â€"œ 4” PVC pipe (pre-cut 2 ft length) (for main unit body)
2 â€"œ 4” male-female pipe connectors (for top/bottom of unit)
1 â€"œ 4” male-female PVC threaded pipe cap â€"œ flat (for bottom of unit)
1 â€"œ 4” male-female PVC threaded pipe cap - with wrench top (for top of unit)
1 â€"œ 3” Outside drain cover (to raise media off the main water feed from recirc & tank)
1 - 5’ length of ½” CPVC pipe;
1 - ½” CPVC elbow;
1 - ½” CPVC Tee connector
3 â€"œ ½ ” threaded quick-disconnect for ¼” tubing
1 package of 3 on/off valves for ¼” tubing (in dept. with the sprinkler parts)
3 â€"œ ½” CPVC male-female connectors (to attach the quick disconnects to the unit)
1 length of ¼” tubing
1 package of mechanical filter material from garden section (comes with a sheet of fine filtering blue material and a sheet of course filtering black material) â€"œ very easy to cut into 4” circles to use between medias. (P.S.>> Its on “end-of season” special sale at Lowes)
And … from my parts/pieces box: 1” of ¾” tubing and 2 small radiator clamps (to attach recirc pump to main pipe); old MJ 400 power head for the recirculator pump (and its strainer pieces glued together for the inside recirc return tube); old secondnature 480 power head for the water feed from my tank.
(If you don’t have any old power heads to utilize, remember to buy one that has round input/output or you will have a VERY difficult time attaching it to the body of the main unit.)
Cost for the parts was around $100.00. Cost for 1 gal LSM Sulfur (CaribSea) and 1 gal/4Kg course aragonite (Reborn CRM) for $53.00 (including shipping from MarineDepot.com). I also had to buy a 5/8” Forstner drill bit to make the holes in the PVC pipe -- $15.00.
If you were wondering why I painted it brown… I could say to make the tube more opaque as the denitrifying bacteria are photophobic (hate light) â€"œwhich IS true, but the truth is my PVC/CPVC pipe cleaner/primer is purple and no matter how careful I tried to be, it dripped/ran all over the pipe (and doesn’t wash off) and it looked horrid. I had an old can of brown paint in my garage, so there you are â€"œ a brown denitrator!

If picture attachments worked, you should see the overall look of the unit, the cut drain for inside, cut filter pads, and recirc drain strainer.

dn1.jpg

dn2.jpg

dn3.jpg

dn4.jpg
 
<a href=showthread.php?s=&postid=13789188#post13789188 target=_blank>Originally posted</a> by ChrisOzment
The negative I can think of is the fact that you can't change the drip rate of either device without affecting the other.

Basically you've anwered your own question here ;)

djfrankie
 
<a href=showthread.php?s=&postid=13801918#post13801918 target=_blank>Originally posted</a> by mjpinsky
question for DJ and the crew...

I'm a bit confused on the amount of media to put in my SD.
On page 14 of the thread one part says to use 1% sulphur/vol tank. While Dj also says to use 1.5L/250gal.
I have a 65 gal tank with ??? water.... lets say 50-60 gal of water.
1% would be about 1.9-2.2L or about 1/2gal (or so) of sulphur (1/2 of the container of LSM). But, 1/4-1/5 of the 1.5L/250gal method would be .3-.4L or only about 1/10 gal of sulphur media. This seems to be a VERY big difference!

I don't want to over-sulphur, and have to take the whole thing apart later as my nitrates drop, on the other hand if I put in the lower amount (which seems to be very little media), will there still be enough sulphur for a good reaction to occur?

Also, does the amount of course aragonite matter? Since I'll have plenty of room left inside my chamber, using either of the above sulphur calculations, should I simply fill the rest of the remaining space with Arag? -- it would seem by reading through the thread that the aragonite buffers out the pH, alk, and Ca levels, so it would seem that you could never have too much aragonite in the chamber.

I'm almost ready to put the media into my SD, so these responses are REALLY needed to get me finished, tested, and up and running.

Thanks to everyone for the help ............ marc

Basic Guidelines to a sulfur reactor:

Amount of media recommended:

1.5 liter for up to 250 gallons of aquarium water (1000 liters)

It was initially recommended 1 Liter of Sulfur media per 1% of total water volume in Liters. Recirculation pumps have made these reactors more efficient.


You are running a recirculating reactor so the amount to use in your case give or take 60 gallons of water would be .36 liters. I would start with 1/2 a liter and adjust much later when your tank hits zero nitrates.

You could use as much aragonite as you wish in there.

HTH,
djfrankie
 
Re: another question I thought of.....

Re: another question I thought of.....

<a href=showthread.php?s=&postid=13798084#post13798084 target=_blank>Originally posted</a> by mjpinsky
When testing my SD, will running dechlorinated tap water to/from it from a bucket be sufficient to test for leaks :rollface:

That's how I do it. You'll know right away if it's leaking or not. Water has a way of finding the smallest places to escape from :D

djfrankie
 
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