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Icon_missing_medium markwiddison 0 Posts
09/30/2010

WTO Board / looking for media for arsenic

I have a client who has used the alcan aasf50 with good results at a fraction of the cost of the other arsenic medias that are over priced with NO guarantees.
Thanks
 
Icon_missing_medium Mark Brotman 0 Posts
09/30/2010

WTO Board / looking for media for arsenic

You can contact an Alcan rep - try Bill Reid at bill.reid@riotinto.com
As far as experience goes, were you looking to treat arsenic, fluoride or something else?
 
Icon_missing_medium Gary Schreib... 0 Posts
09/30/2010

WTO Board / Removal of Cu and Zn

Yes, provided it is all dissolved in the water. You haven't given us enough info on the application nor on the rest of the water analysis.
 
Laurence%201998 Laurence DAl... 3 Posts
09/29/2010

WTO Board / Removal of Cu and Zn

The concentrations of Cu++ and Zn+ are 8 mg/L and 12 mg/L respectively. We would like to get that down to < 1 mg/L. Is this the correct concentration range to get a SAC H form resin to work?
 
Icon_missing_medium Gary Schreib... 0 Posts
09/29/2010

WTO Board / Removal of Cu and Zn

Na form of SAC resin will remove both, HOWEVER, salt regeneration will not remove the accumulation. H form is the better choice if you can accept the low pH result. An alternative would be a WAC resin that has been regenerated with acid and also with NaOH. That result would not have a serious pH change. If this is an industrial waste water that is to be treated for disposal then a Chelation resin is a good choice.
 
Icon_missing_medium rexjohnson 0 Posts
09/29/2010

WTO Board / Water turning brown

Ame
If you don't know your source water, how much, how little, and from which supply you are dead in the water.
Sir, you must know the particulars of the water being fed to each and every part of your treatment system.
Without this information you cannot possibly make any determination regarding treatment.
This is a problem without an answer due to a lack of information.
Cordially
Rex Johnson
 
Icon_missing_medium davehedger 0 Posts
09/29/2010

WTO Board / Water turning brown

It's hard to troubleshoot from long distance, but here are some thoughts. I'm concerned that "they" can't tell you which source is used, because the answer to your problem could lie with "them." Your stagnant loop idea has merrit. Do you, or others who have maintained the system, ever flush the pipes with a cleaner? You could submit a sample to be checked for oxalic acid. Oxalic acid is sometimes used as a flush to remove rust scale. If your stagnant loop got blocked in for a long period of time, with oxalic acd, it's probably leaking now. Your plan to monitor the water weekly is a great step in the right direction. Good luck.
 
Icon_missing_medium arnevestad 0 Posts
09/29/2010

WTO Board / Water turning brown

Thanks for your input to my posting. They cannot tell us which water source is used, but the boiler make up is from the same water supply line and the boiler water is good.
Because this is a very old facility with appox. a dozen buildings with a common boiler house/Chiller, we are wondering if it could come from a loop that has been out of service and all of a sudden been put back in service? You know old stagnant water with a smell.
We are now following up with weekly water testing and still looking for the source of the problem. pH is on a slow increase.
Have a great day, Arne
 
Laurence%201998 Laurence DAl... 3 Posts
09/29/2010

WTO Board / Removal of Cu and Zn

We have Cu and Zn in the low ppm concentration range. Is SAC H form resin something we should take a look at to remove Cu and Zn?
 
Icon_missing_medium davehedger 0 Posts
09/28/2010

WTO Board / Water turning brown

I'm curious about the two sources of water, "city water or well with high silica." Different sources can have markedly different properties. If the source water has historically been intermixed in a holding tank, those differences may have been mitigated. You didn't give analyses of the two source waters, and the explanation for your observation might well be found there. Are the source waters mixed as they enter your facility? Or are you sometimes running on straight city water, and other times on straight well water. Late summer is usually the worst time for water quality from a well, as aquifers dwindle and contaminants are concentrated. If I were a betting man, I'd bet that your latest round of tests reflect the straight well water at it's worst.
 
Icon_missing_medium owenthorsen 0 Posts
09/28/2010

WTO Board / WQA Financial Presenter

Anyone on here recall the name of the blonde woman who made financial and stock presentations at the last couple of WQA trade shows?
I want to see how her portfoilio reflects what is going on in the water technology industry.
 
Icon_missing_medium arnevestad 0 Posts
09/28/2010

WTO Board / Water turning brown

We have a problem with water in a large chilled system. The water has been stable and clean with normal data for over two years. Last winter they did some major mechanicel work in the piping, removing a large water holding tank etc.etc.. The testing of the water was normal up to end of July with this data: pH 8.5, Conductivity 326uS/cm, Iron 0.05 mg/l, Copper <0.05 mg/l, Sulfate 15.6 mg/l and Chloride 6.4 mg/l.
On September 21st the following data: pH 5.13, Conductivity 652uS/cm, Iron to high for our test instrument????, Copper 0.29 mg/l, Sulfate <5 mg/l and Chloride 1.1 mg/l.
Taking the water sample the water is still clear and clean to look at, but next morning the water is reddish brown and cloudy.
Iron bacteria? or something ells?
The raw water source is either city water or well with high Silica.
Arne Vestad, IWTNA
 
Icon_missing_medium markwiddison 0 Posts
09/28/2010

WTO Board / looking for media for arsenic

We are looking for activated allumina alcan aasf50
and has anyone had experience with this product,
 
Icon_missing_medium charlienorth... 0 Posts
09/28/2010

WTO Board / Working in the Bahamas

We are currently helping a client located between HopeTown and The Abaco Inn with his new resteraunt and cottages. For years and in many places today the primary water source is rainwater collected in all types of cisterns. I first started visiting the Bahamas 30+ years ago and was always amazed that folks drink the water from these cisterns with no sanitizing agent added. Today, most comercial places use some type of disinfectant, either some form of chlorine or some use UV/ozone. Our client has an RO for back up water along with several cisterns. The 'well water' averages over 5k ppm and usually very high iron.

 
Icon_missing_medium stevewithers 0 Posts
09/27/2010

WTO Board / Another GAC Question

Can you direct me to a brand (or source) for the organically modified clay media?
 
Laurence%201998 Laurence DAl... 3 Posts
09/26/2010

WTO Board / EBCT for GAC Filters

I agree, EBCT is not the only factor going into GAC filter sizing, design. We assume 6 gpm per sq.ft of CSA bed area. Then there is adsorption isotherm for prediction of breakthrough and saturation of organic contaminants. I've never seen an isotherm for chlorine.
 
Laurence%201998 Laurence DAl... 3 Posts
09/26/2010

WTO Board / Another GAC Question

I agree Organically modified clay is used for oil/water separation media. A blend of bentonite and anthracite treated with a quaternary amine removes mechanically emulsified oil and grease, large molecular weight chlorinated hydrocarbons and heavy metals. 50% more efficiently than activated carbon. Pre-treatment with organo clay extends the life of the activated carbon by seven times, reducing waste water treatment costs by 50% or more.
 
Icon_missing_medium aurelioflores 0 Posts
09/25/2010

WTO Board / Alkaline Water with Potassium & Sodium.

Seems to me that if you are adding 650 mg/l of potasium
and 100 mg/l of sodium you are all ready exceeding the 100ppm of tds
1) 650mg/l potassium + 100mg/l sodium = X tds
2) ph can then be regulated by lowering or raising the alkalinity of the water
 
Icon_missing_medium Jim Wark 8 Posts
09/24/2010

WTO Board / Another GAC Question

Oil and grease are far different problems for reduction than chlorine . many times, people will use products like organic clay made into media for this type of application. Regarding the rainbow, many times plumbers I have gone in after, have left flux or cutting oil in the lines without properly flushing them out. Not saying this is your answer, just my experience.
For the other ideas that might follow, you might want to get a water analysis posted so we can see what else might be contributing to this.
Well or city, flow rates at peak, hours of operation etc....
 
Icon_missing_medium stevewithers 0 Posts
09/24/2010

WTO Board / Another GAC Question

Having read the post below, and to reinforce what is being said and add a further "non textbook" situation....I have had great success mixing GAC & resin on muny systems to eliminate hardness & remove chlorine & chloramines in the same tank. We use 12X40 Biituminous and put about 14-16" GAC on top. Have had systems out for as much as 10 years with excellent removal results of chlorine, chloramines, & hardness. Have noticed no resin fracture or degradation. EBCT in these cases is usually 1/2 minute to 1 minute.
However, I have a situation where a customer had 5 mg/l oil & grease and was experiencing a rainbow film on sinks etc. All other chemical tests were relatively normal. We applied a 48" backwashing GAC filter. EBCT was 2 1/2 minutes. Tests after 1 month or so showed the oil & grease at the same 5 mg/l at the household fixtures. I did not install a test port immediately after the filter. Is it possible that oil & grease could be picked up in the plumbing lines after the filter? If so, will chlorinating lines remove it? Or is the EBCT for oil & grease removal much greater than for chlorine & chloramines? Somewhat baffling.
 
Icon_missing_medium louisberlin 0 Posts
09/23/2010

WTO Board / BIG RO ?

Paul,
Send me an e-mail. I can give you a design for yor problem
Louy
 
Icon_missing_medium ramior 3 Posts
09/23/2010

WTO Board / EBCT for GAC Filters

I have the same question but I will phrase it somehow different:
Given that contact time for chlorine removal from tap water should be at least in the range of 6 to 15 min. how come GAC cartridges are doing their job?

There isn't a chance that the contact time inside the GAC cartridge reaches 6 or even 3 min.!

 
Laurence%201998 Laurence DAl... 3 Posts
09/22/2010

WTO Board / EBCT for GAC Filters

Got an interesting question today concerning the Empty Bed Contact Time for GAC filters. According to the following equation: EBCT = Volume of GAC in cu.ft. x 7.48/Flow Rate in GPM. If we assume a conservative 15 min. EBCT for the removal of Chlorine and a flow rate of 10 GPM this equation yields a required volume of GAC of 20 cu.ft. Question: how does a POU carbon filter remove Chlorine when the volume of carbon is much less than one cu.ft of GAC? Is it because they use carbon block and there is more pressure on the carbon?
 
Icon_missing_medium Allen Hurtado 9 Posts
09/22/2010

WTO Board / BIG RO ?

Discharge to open sea is a possibility (is the application anywhere near?), but as with ANY high load disposal, regulatory constraints must be addressed and met. And appropriately so.
A
 
Icon_missing_medium davehedger 0 Posts
09/21/2010

WTO Board / BIG RO ?

Rex,
I have no expertise in deep well disposal. Undoubtedly it is only appropriate when geological conditions are right. We don't know where Paul's application is, and you may be correct in your objections for the reasons you cite. Nor am I tacitly recommending it, simply suggesting it could be considered. :)