disposal of high content CaCl waters 4

[asesor]

I have to dispose of 20.000 bbls of 40.000 ppm CaCl water. I dont have an injection well and would like to see if anybody has a better option than evaporation

 

[orenda1168]

Asesor:

As simplistic as this may sound, I would think that addition of sulfuric acid, precipitating calcium sulfate, removal of that by sedimentation/filtration, and discharge of the effluent with any pH control or removal of other contaminants (which you did not indicate as being present) to either land or waterways, might be the easiest answer for you.

Dick Kersey
Orenda Technologies, Inc.

 

[kenvlach]

Are you near any dusty gravel roads or construction sites?

It's rather dilute, but CaCl₂ solution can help clarify wastewater solutions. E.g., metal finishers who precipitate out heavy metals as hydroxides.

If you could concentrate the solution, it might be worth transporting. Do a search for dealers of wastewater treatment equipment; see if you can rent an 'atmospheric evaporator.'

 

[KRSServices]

Where are you located?

Kenvlach is on the right track. If you are nearby, I wouldn't mind taking it off your hands if you can conentrate it a bit more and ship it here cheaply. There are several roads here in need of some quick dust suppression next spring!

Our environmental agencies are a little more forgiving for it's use as a dust palliative for rural roads.


KRS Services

http://www.krs-services.com

 

[asesor]

I´m located in Venezuela. The CaCl solution is used in the drilling operations as well as KCl solutions. I will test the sulfuiric acid treatment to see what happens. The problem with discharging it is the high cloride reading. I thougth evaporation may be an alternative but I would need a big one.Will this also work for potassium chloride?

 

[bimr]

Don't waste your time with the sulfuric acid treatment. The fellow that wrote about sulfuric acid treatment obviously does not know what he is talking about. Treatment with sulfuric acid is not going to change the total dissolved solids in any meaningful way. All that he has proposed doing is changing calcium chloride to sodium chloride. What you want to do is get rid of the salts, not make additional wastes!

If you want to treat this waste onsite, the only thing that you can do is to evaporate it. Same treatment for potassium chloride.

You may consider offsite disposal. If all that you have in this wastewater is calcium chloride, then it can be blended into sanitary wastewater and discharged. Most sanitary treatment plants do not have limits on TDS and as long as the mixture is diluted into the wastewater, there should be no problem.

I don't think that you want to dump this material on roads since the stormwater runoff will kill vegetation.

 

[asesor]

Where would I get sodium chloride with sulfuric acid?
I don t understand that. I´m going to test it. Hopefully the byproduct is not water soluble.
Over here you cannot dump chlorides in the waste treatment plants.

 

[bimr]

If you only add sulfuric acid to a calcium chloride solution, you will not precipitate anything. All you have after the addition of sulfuric acid is a dilute acid.

I don't think that you will be allowed to discharge an acidic solution. On the contrary, it would be less hazardous to just discharge the calcium chloride.

You can not precipitate calcium sulfate unless you have a basic solution. A basic solution is when the pH is above 10 units. To get a basic solution, you will have to add an alkali. Commonly used alkalis that are selected for this purpose are sodium hydroxide or lime (calcium hydroxide).

In summary, what the fellow recommended is to precipitate the calcium sulfate out of a sodium chloride solution. You would be left with the sodium chloride solution and some solid wastes.

Also, I did not say to dump the chlorides. What I said was that most sanitary WWTP would not be affected by calcium chlorides as long as the calcium chloride mixture is diluted into the wastewater. It is rare when discharges have wastewater dicharge limitations on TDS.

If you contract with a waste hauler who treats the wastewater before he discharges into the sanitary system, he is going to blend this into his other wastewater discharges and end up with a lower TDS.

Seawater has 19,000 mg/l of chlorides so if you have an ocean discharge, it should be no problem to discharge to the ocean. Ocean disposal would be preferable to dumping the calcium chlorides on the ground, wouldn't it?

Calcium chloride is commonly used in the northern climates as road salt, so it commonly enters the storm water systems in the cities and enters the wastewater treatment plants where there are combined sewer systems.

By the way, you haven't said if is there anything else in the calcium chloride soluton?

 

[asesor]

That´s exactly what I was thinking, dumping it into the ocean where it would be most beneficial. and No it does not have anything else.Here I´m thinking of patenting that dust control methtod but the surface runoff worries me.

 

[KRSServices]

Patenting the application of calcium chloride as a dust suppression? Are you kidding me? I'm from the "northern climate" and I can provide much information to you on this subject, because part of my business is winter sanding. I also do dust controls, but once applied they do not "run off"....they mush when wet! That's why they are good in a pinch, but not good for a yearly or really heavy application.

As for the comment about using it as a road salt, yes that happens, but only as a "pickling" mix in a sand pile to prevent it from freezing.

If you would like any more information, just ask. I can provide some information from a roads maintenance and operations perspective.

KRS Services

http://www.krs-services.com

 

[asesor]

well yes I would like more information spewcially if it coulkd be applied to cement mining. My e-mail is asesor7@cantv.net. Well so far my only option in the calcium chloride solution is either dumping into the ocean or evaporation. especially in those quantities. Anyone else with more ideas?

 

[bimr]

Here is a site that may help you:

http://personalweb.smcvt.edu/vermontlocalroads/FactSheet files/road_dust_control_with_calcium_c.htm