Published by R McK
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?
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.
Published by Stewart Shipard, Owner Manager at SLS Technology Pty Ltd - a Water Industry company
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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Published by Alfred Lipshultz, President at Aquathin Corp.
May I add a question? How do you measure low levels of arsenic on site (without ICP-MS?
Published by Stephan Hubig
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
Published by Juan Carlos Garcia Carrasco, NCP Societal Challenge 5 H2020
Natures Sunshine has a sink top RO Water Purifier. Very effective.
Published by Sherrilyn Church, President at SALT Mission
Arsenic is one of the ions. It ll removed by RO process.
Published by Abdul Munaf, Mechanical Engineer
You can contact Mr. Dinkar Saxena
He is an water and waste water treatment expert. And a master of diffusion process.
Contact no. +91-9837007304
mail:- dinkar@wateronline.co.in , dinkar.saxena@gmail.com
Published by Anand Kumar Pandey, Environmental Design Engineer - P.H.E. at Dass Rasayanic Services
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.
Published by Nissim Malul, President at Karma Integrity Inc.
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.
Published by Eduard Bes, Waste & Water Technologies, SL - Technical Manager
Not as effective for arsenic IIL As with borates.
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
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.
Published by C. Bruce Bartley, President and Senior Technical Officer
You must be sure that it is in the As+5 state; As+3 is not well removed by RO. So, prior oxidation may be necessary, but chlorine will damage RO membranes, so it would need to be reduced before the membrane or converted to chloramine.. Use of iron hydroxide or alumina media also work well and probably cheaper than RO.
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
Arsenic removal you can do better with
Published by Gunther Johne, Consultant - Environment Engineering (Water Treatment / Water Management / Resource Recovery)
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
Published by Juan José Mauricci
No need to go RO for As removal. Just sorbents media, unless very low concentration should be attained (whiche would require, IMHO, IX, not RO).
Published by Ing.Tiziano Zampollo, Employee at Water Engineers & Consultants - WEnCo
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
Published by Oksana Mazur, Project manager at GlobeCore
Ceramic SiC membranes do it in a submerged system, no RO needed - just FeCl3 dosing.
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Kay Gunther Gabriel
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Published by Rolf Richard Keil