Mercury Removal from Produced water

[123engr]

Good day all,

A professional friend of mine asked me the question below. Since, I have no idea, I chose to share it you all for advise.

We have a maximum load of mercury in the discharge produced water stream of 0.2µg/l (micrograms per liter) against a minimum spec of 0.05µ/l.

Can we find any technology to get 0.2 to 0.05?


Thanks for your contribution.

I am what I am by His grace

 

[cloa]

Precipitation typically reduces Hg concentrations to
less than 2 ppb and requires chemical addition, continuous monitoring and large footprints for settling (EPA 2007).

http://www.nist.gov/tip/wp/pswp/upload/137_aqueous_phase_mercury_removal_strategies.pdf

Google trace mercury removal- many hits.

 

[MJCronin]

How close will an inexpensive, activated carbon filter bring you ?

http://www.calgoncarbon.com/index.php

??????

 

[bimr]

Granulated carbon is often used to polish treated mercury solutions with varying success, but will not come close to the proposed limits.

Mercury is one of those compounds where there is a "fear factor" associated with it (like asbestos) and where it is also possible to detect extremely small amounts in water. With those elements, one can be sure that mercury will be an issue.

To remove mercury, sulfide precipitation is a reliable technology that is capable of meeting extremely low discharge requirements. Siemens has a treatment scheme presented in the link below that utilizes sulfide precipitation.

There are other mercury technologies such as resins, carbon, etc. My understanding is that sulfide precipitation is probably the best core technology.

Bench and pilot testing will be critical for the success of an application.

http://www.water.siemens.com/en/pow...gas_desulfurization_wastewater_treatment.aspx

http://www.degremont-technologies.com/IMG/pdf/tech_infilco_FGD-Mercury.pdf

http://www.ncsafewater.org/Pics/Tra...s/AC10_SpecialTopics/ST_M.AM_11.00_Cooper.pdf

Siemens has been successful in removing mercury to less than 20 ppt with sulfide precipitation. Precipitation is not a standalone technology, it is used in combination with filtration and other technologies.

 

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