BEST ORP for Sulphur NO3 Reactor (De-Nitrator)

Sorry, noob to Sulphur here. Where do you guys have your probe? Inside the reactor or in your sump where the effluent comes out?


in the reactor...if you look at the pictures closely you can see the probes.
 
great!!!!



that's a giant reactor, i have "toyed" with the idea of getting a bigger one. With flow like that and no3 free effluent, imo, you well get great results.

keep us updated....



I have learned to always buy bigger than I need, glad I did this time. Serdar from GEO suggested it's too big for a 150, and sold me 10lbs of sulphur suggesting it was more than enough. 10lbs brought the tank down from 40 to 15ppm but never better. Now that I have it full it's moving down again did 3 50 gal WCs after I filled it two weeks ago, was just less than 10ppm, now down to ~6.

If I had it to do again I would have got the 12"


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Picture of the critters making the NO3

Picture of the critters making the NO3

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Ran at 100 for two days, last night went up to 130 with no changes then went back down to 100.

I hate the Red Sea because the NO3 test takes 12 minutes, but any trace of NO3 is pink on the Red Sea, so even at ORP of 100 no NO3 in the effluent. Still running about 6PPM in the display


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No changes to input flow, running open output, but, just climbed to 173, I'm out of town, so I can't measure the effluent rate, but, can't imagine it changed without touching anything. So, perhaps the bacteria colony grows over time. Hopefully I will be able to increase flow and clean more water.


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Out of town until Friday, but NO3 RX ORP is still going up, I had my wife FaceTime the effluent line and it's still flowing what looks like the same ~12.5oz/min. The needle valve on input is very sensitive, so I'm hesitant to have my wife adjust (open) it. So... I have alert set for -300, should it hit that, I will risk the remote hands adjustment.


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Hmm, that's a big change in ORP. I wonder whether there might be more organics for some reason. Hard to tell.
 
Tank ORP is within 20 at +255, I would think the organics would drop tank ORP at the same rate as the RX without additional bacteria growth to consume the oxidizers since it's already negative. Since my post the RX is at -275 so I'm going to have my wife open the needle valve 1/8 of a turn


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Just got home from NYC, last night RX ORP went up to 290 so I had my wife fill the cup and it was at 9oz/min, I used FaceTime and walked her through opening the needle and re-measuring to get to 13oz/min, by morning it was down to 243, then by the time I boarded my flight, it was back up to 256. I did a measurement and it was still at 13oz/min. I adjusted to 15oz/min no change for about an hour, so I adjusted to 17oz/min about 30 min ago and it went down to 252 as of now. I tested tank NO3 at 7ppm and effluent at 0ppm, so looks like I may have to go to 20oz/min or more.
 
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RX output rate is climbing past 20oz/min the cup is hard to see but between 16 and 24oz. ORP is -230 and falling may have to increase to 24oz/min. Effluent is still zero tank is down to 2.5ppm


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good stuff!!! as DT no3 keeps going down, flow will need to be increased even more.
 
good stuff!!! as DT no3 keeps going down, flow will need to be increased even more.



The RX has a 1/4 OD tube in and out not sure how much more than maybe 24oz/min I'll be able to put through it. I assume as long as I don't smell rotten eggs, the ORP is less important at the higher numbers.


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I would suggest you measure output in volume. I measure in ml so if I change flow I know. What if you get a clog in the line or pump fails 1/4 turn means nothing.
 
I would suggest you measure output in volume. I measure in ml so if I change flow I know. What if you get a clog in the line or pump fails 1/4 turn means nothing.



I'm confused how is oz/min NOT volume? Where did I say turn?


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The RX has a 1/4 OD tube in and out not sure how much more than maybe 24oz/min I'll be able to put through it. I assume as long as I don't smell rotten eggs, the ORP is less important at the higher numbers.


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yes, that is where i'm at, flow at max and very low ORP. i agree also watch for smell, however, ime with good flow it never happens. i think the smell comes when flow is very slow or stopped.
 
yes, that is where i'm at, flow at max and very low ORP. i agree also watch for smell, however, ime with good flow it never happens. i think the smell comes when flow is very slow or stopped.



You said you're about 2gph (4oz/min) what's your ORP and tank NO3?


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You said you're about 2gph (4oz/min) what's your ORP and tank NO3?


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yes about 2 gph. today ORP was -367 and no3 last week was ~1.00 ppm. i'm planning to increase flow a little by removing a valve, but i can't get much more flow.
 
yes about 2 gph. today ORP was -367 and no3 last week was ~1.00 ppm. i'm planning to increase flow a little by removing a valve, but i can't get much more flow.



No foul smell at -367, I assume, so I shouldn't worry about how far down ORP is as long as I'm at high flow? Just read a bunch of horror stories of hydrogen sulfide contaminating the tank.


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No foul smell at -367, I assume, so I shouldn't worry about how far down ORP is as long as I'm at high flow? Just read a bunch of horror stories of hydrogen sulfide contaminating the tank.


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i have been as low as -412, without smell and a cleaned probe with good flow. i cut back on my autowaterchange, but all is good. horror stories involve lack of flow, right?
 
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