Raw water TOC removal

[Joemike]

Right now we are having problems with TOC's in our demin train. The water comes from a river and is treated with a coagulant and a floculent on the way to our retention pond. We use chlorine before we send it to the plant about 10 miles away.

The problem we are having is that the TOC's are plugging up our multi media filters (even to the point we had small swimming things for awhile).

What are some good companies to look at to assist us with this problem.

 

[cub3bead]

If your retention pond isn't covered you are wasting your time pre-treating it. It would be better to treat the water before the filters.

 

[sbush]

You should contact a local consulting engineering firm that has experience with water purification projects. Have you checked with the designer of the current water treatment system? If your plant is located near other industrial plants that might be using the same water source, you might consider contacting their facilities engineer to see what is working for them.

If you can tell me roughly where you are located, I can probably give you some contacts.

S. Bush

http://www.water-eg.com

 

[Techcitizen]

Joemike,
I have come across the problem of high TOC and it was solved by installing a RO downstream of DM plant to further polish part of the Demin water. This RO polished water is used only for boiler make-up which is relatively a small quantity (approx. 7 to 10 m3/hr). If you are interested further pl leave your e-mail ID here.

 

[bimr]

TOC is used as a measure of the organic content and is generally a low number. It is not generally used to describe the concentration of something that would foul a filter.

I have seen this water sucessfully treated with a two stage filtration process. Starting at your retention pond. The first stage filter (working filter) should be a direct filtration process using a polymer added inline before the first stage filter(s) operating at 3 gpm/SF. The second stage filter(s) should be polishing filters operating at 6 gpm/SF.

The filters should produce an extremely low SDI water that will allow the use of an RO process. You probably should have an RO process installed in front of your DI units anyway to reduce the cost of treating the water.

Siemens Water or Graver should be able to help you.

 

[sbush]

We have water softeners installed at a manufacturing plant for boiler feed water. The water source is the Cooper River. The pretreatment system is the Culligan MultiTech two-stage clarifier/filter system just like the one described by Bimr (above). The system is very well maintained (i.e., a German owned company). Our softeners have sight windows to observe the top of the media bed. Even with coagulation, clarification, filtration and chlorination, you can still observe small creatures swimming around with jack-knife movements and tunneling into the resin. The softeners have been rebed and chemically cleaned and disinfected several time, and yet the creatures return.

There is a solution. But first, you have to get professional help. Equipment manufacturers are in business to sell their equipment. You really need an unbiased consultant who is able to consider more than just one or two pieces of the puzzle.

S. Bush

http://www.water-eg.com