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Post by mrceniceros on Oct 31, 2022 16:54:37 GMT
Hey guys.
I have a carbon tank who's readings fluctuate between 0.0-0.02. I know they are within parameters and the city hasn't been working on anything. I noticed that this has been going on since our booster pump sensor was replaced and calibrated. Could this fluctuation be caused by increased water pressure (SUEZ guy increased the pressure just a bit)?
Thank you.
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Post by qman213 on Oct 31, 2022 17:42:05 GMT
What kinds of control heads do you have?
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Post by bimitiri on Nov 2, 2022 10:09:24 GMT
0.1 is the maximum limit of chlorine level while >0.05 is the action level
By increasing the incoming water flow into the carbon tank also reduces the contact time between the incoming water and the carbon granules.
Thus increasing the pressure of the booster pump does affect the contact time
In our setup, normally incoming water to the RO set to between 3 bar ( 300 kpa ) and 4 bar ( 400 kpa ) after the booster pump
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Post by Chuck Weddle on Nov 2, 2022 10:27:14 GMT
0.1 is the maximum limit of chlorine level while >0.05 is the action level By increasing the incoming water flow into the carbon tank also reduces the contact time between the incoming water and the carbon granules. Thus increasing the pressure of the booster pump does affect the contact time In our setup, normally incoming water to the RO set to between 3 bar ( 300 kpa ) and 4 bar ( 400 kpa ) after the booster pump Where did you come up with an action level for chlorine? I have not fully digested ANSI/AAMI 23500 yet but I know AAMI RD52 and RD62 don't mention one. Also, increased pressure doesn't necessarily equate to higher flow, especially in this case. Regardless of how high the feed pressure is, the RO machine flow rates remain constant thus the flow through the carbon bed doesn't change. |
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Post by qman213 on Nov 2, 2022 11:34:39 GMT
0.1 is the maximum limit of chlorine level while >0.05 is the action level By increasing the incoming water flow into the carbon tank also reduces the contact time between the incoming water and the carbon granules. Thus increasing the pressure of the booster pump does affect the contact time In our setup, normally incoming water to the RO set to between 3 bar ( 300 kpa ) and 4 bar ( 400 kpa ) after the booster pump Where did you come up with an action level for chlorine? I have not fully digested ANSI/AAMI 23500 yet but I know AAMI RD52 and RD62 don't mention one. Also, increased pressure doesn't necessarily equate to higher flow, especially in this case. Regardless of how high the feed pressure is, the RO machine flow rates remain constant thus the flow through the carbon bed doesn't change. We do the same thing. We use >0.05 as an action level. We use the RPC strips. When looking at the color scale, colors greater than 0.05, can be difficult to differentiate. |
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joey
Full Member
Posts: 226
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Post by joey on Nov 8, 2022 16:12:21 GMT
Temp of water and EBCT will affect it day to day so if your flow is increased it could be higher.
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Post by dave74 on Dec 5, 2022 13:41:45 GMT
How does pressure increase flow? Your flow rate is based on the maximum amount of water your RO could possibly use, not pressure. What do you do at the action level? Rebed your carbon tanks? If surveyors see that, you need to be sure you are following you own policies.
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Post by bimitiri on Dec 20, 2022 7:25:04 GMT
Sorry for the late reply .. Regarding pressure affecting the flow, I might be wrong . Thank you for the correction. I was just thinking too much.
Regarding the action level, its the protocol set up by the hospitals mostly so that any chlorine issues can be eliminated asap before it reaches the dangerous 0.1 ppm level .
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cane
New Member
Posts: 27
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Post by cane on Dec 20, 2022 17:13:00 GMT
A range of 0.00-0.02 mg/l is one heck of a small window to work in. Your carbon adsorption can be altered day to day based on incoming chlorine level, water temp, interfering substances like Total Organic Carbons (TOCs), frequency of backwash among other things. In my clinics we have organic scavenger tanks, which handle the fluctuation in TOC levels, and that keeps us with very low total chlorine readings. I say that to suggest that it might be worth having some incoming water tested for TOCs, especially when the total chlorine is at your action range, to eliminate that as a potential cause. In the southeast I've seen this more in areas with river water as their source, so depending on your location it may be more or less likely to be the issue.
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