Arsenic Removal by Reverse Osmosis

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Does anyone have experience with the effectiveness of arsenic removal by reverse osmosis in low iron waters?

How can arsenic best be removed from water by RO? 

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16 Answers

  1. I have plenty of experience with this type of task over the past 30 years.  Removing Arsenic by RO can be done BUT is considered inefficient because both Arsenous and Arsenic acids do not readily dissociate into their respective ions unless the water is highly alkaline.  Osmosis works on dissociated salts.

    There are many options for this task but for best practise the designing of an Arsenic removal process must be a holistic approach because the concentrated arsenic can be more dangerous than the low concentrations in the feed water!

    The best Arsenic processes' takes into account how the concentrated Arsenic will be made safe for the environment and future generations.     

  2. We concur with Mr. Joseph Cortuvo's response below.  Additionally, Aquathin's Multi-Barrier RODI Process removes both As 3 & 5.

    Further, as advised in earlier comment for similar question, Aquathin's LeadOut media removes both AS3 & 5, fluoride, lead, cadmium.  The benefit here is if your focus is soley arsenic, the media removes from environment vs RO which redirects to drain becoming someone else's problem downstream.

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  3. May I add a question?  How do you measure low levels of arsenic on site (without ICP-MS?

  4. Arsenic is going to be removed with RO. The removal rate will depend on the specific features of the membranes, design of your plant, and so on. Usually for arsenic removal is better to work with high pH, for example dosing NaOH, but you will have to have in mind that it will increase slightly disolved solids on both feed and demineralized water and therefore must be include in the system calculation

  8. We work with a mineral liquid matrix consisting of 70-102 ionic minerals, from biotite. It removes Arsenic at a rate of 99.9% among 250 other contaminants. Water will be rendered purified, structured, and oxygenated, restored to it's live spring state. No machines, no expensive devices, no fancy equipment, only add our natural minerals and watch it happen in front of your eyes.

    www.AuroLiquidGold.com

  9. Please, check this techonolgy (Onewater) on www.onewatertech.com.

    It can remove up to almost 100% of As (III & V). No matter what other pollutants you have.

    If you need more info, please contact me.

    BR.

    1 Comment

  10. As you can see from the comments, there are many water quality issues to consider before deciding on a treatment technology and specifically RO.  The species of arsenic, the oxidation state of water, and other chemicals in the water such as iron.  Check the EPA Arsenic rule for guidance as well as these comments.  

  12. Arsenic removal you can do better with

    1. An oxidation step with ozone or another powerful oxidant before a filtration system.
    2. Filtration step with an adsorptive acting filter material e.g. grained iron hydroxide. If you will use this treatment for the arsenic removal it´s necessary to reduce the iron and manganese of the raw water before.
    3. Chemical precipitation with iron salts before a filtration step

  13. RO membranes are usually the best solutions for As removal. You can use traditional RO membranes or special purpose membranes which they are arsenic specific ones. Please send me your e.mail, I will send you more information about. My e.mail is juanj@outlook.com.ar

  15.  We have an experience of working with Vortex Layer device by GlobeCore for Arsenic removal
    here is the link for video-report from the test https://youtu.be/UG4VvdrF2UM