air stripping first, then oxidation or bio treatment. but someone may help with more detail, like when to use stripping, when to use bio, and when to oxidize..
Buna-N gasket is fragile to oxidant, I think.
EPDM is somewhat a standard for various applications because it is cheap and commonplace and good mech/chemical property.
see the attached for an overview of gasket material...
I think you are not posting the right question here.
The core problem is how to design a supply loop to meet POUs pressure and consumption requirements? Is this right?
If yes, you need to take account into all the ideas expressed as above:
1 - What is the minimum flow required by the pump...
Thanks for all the inputs.
To bimr:
The UPW system is new, started running in 2005 and has run well.
the MB resin can not separate well, becuase the inlet water is 1Mohm.cm and the setpoint of MB exhaust is according to 50pppt boron. so the H and OH resin still alive and attract each other...
Thanks S.Bush for the insights.
Becuase the high-purity NaCl not readily available.
Now I have killed the mixed bed resin with 55g 100%NaOH/L (anion resin).After this, displace and rinse the bed.
And the separation was very successful. After double regen, the rinsing water resisitivity is...
Dear All,
I got a UPW plant:MMF->ACF->cat-anion->RO->MB->Polishing.
Now the MB resin can not separate well, becuase the inlet water is 1Mohm.cm and the setpoint of MB exhaust is according to 50pppt boron. so the H and OH resin still alive and absorb each other.
After discuss, we use NaOH to...
Thanks for bimr's insights.
Next Monday, another regeneration will be made. at that time, if the top level keeps the same with last one, we can tell it is due to regeneration level problem.
if the level goes down again, which i don't want to see, the resin is lost due to some reason.
Ok, i...
To me, once the valve is open, it opened to its setup open degree. So the problem is not the valve itself if it is able to open. So the flowrate is low, it should be wrong with the feeding pump like BIMR comments. Please check the overall pressure profile of your system.
Hi,bimr,
Based on your advice - swelling/shrinking concept, i would like to guess: when resin is new, it is totally swellen for SAC/SBA resin. When the new resin is exhausted, it got shrinken for SAC/SBA resin which is about 8% and 20% less for SAC and SBA respectively. But when it is...
Dear All,
we have one UPW plant in starting up.
one problem occurs: the regen WW from cation bed / anion bed get a layer of bubble which malfunction our ultrasonic level sensor.
so what causes these bubbles/foaming??
thanks, nick
Dear All,
i had made a MB internal repair for one client, and then loaded with new MB resin(R&H 1400H/4000OH). and i loaded till resin level reached the middle of middle sight glass.
but after the first regeneration, the top level is 7 cm lower??!!
the first reaction is resin is leaking from...
Dear Gacguy,
Thank you very much for your thoughtful input.
Is it possible that the dosage of NaClO reduced the hardness of activated carbon? If so, this possibly can explain why caron running out after a month's operation.
i would like to rethink the design paramenters.
thank you.
Nicksun
Hi, Gacguy
Thanks for your thoughtful ideas, i would like to answer your questions as follows:
1. inlet ACF water is municiple water complied with chinese drinking water quality requirements.
2. the main contaminant, to me, is TOC. That is also our purpose to use activated carbon after...
Hi, Gacguy
I answer your above questions as following:
carbon size: 0.4mm--1.4mm
backwash flowrate: 30m/h
operation mode: continuous downflow
temperature: 25-40 deg C
Backwash starts when pressure drop larger than 1.0barg or operation time more than 5 days.
the color appears all the time in...
Hi,
I would like to suppose the rated pressure 260Psig is designed as H2O. So there should be a conversion factor as for your medium which is the density of naphtha which is less than 1.
So 300Pisg by 0.6(????)should be less than 260pisg.
Am i right?
thank you.
Nicksun
Hi, Gacguy
We use city water(in Shanghai,China)to produce Ultra Pure Water. We use jet flow to load carbon to the vessel.
As for the prewetting procedure, we have to rinsing the carbon just before it was brought to the vessel by jet flow.
We have backwashing and rinsing procedure before...