Direct Arsenic Removal from Water Using Non-Membrane, Low Temperature Directional Solvent Extraction

12 February 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Arsenic (As) poisoning in water due to natural minerals or industrial pollution is a critical global problem that threatens the health and life of billions. Current arsenic removal techniques involving chemical reaction, ion exchange, or membrane processes can be expensive, inaccessible or infeasible for underdeveloped regions or remote areas. Here, we demonstrate that using a so-called directional solvent extraction (DSE) process, arsenic ions in water can be effectively removed without the need of a membrane or chemical reaction, and this process promises to utilize very low temperature heat (as low as 45 oC). We have tested feed water with different arsenic concentrations and arsenic ions in different forms (As-III and As-V) commonly found in nature. It is demonstrated that DSE using decanoic acid as the directional solvent can purify contaminated water to meet the drinking water standard (arsenic concentration < 10 parts per billion, ppb), and the arsenic removal efficiencies are higher than 91% for As-III and 97% for As-V. Moreover, DSE can remove As-III directly without the need of pre-oxidation, which is required in most of the state of art techniques. DSE can potentially lead to effective arsenic removal technologies with low resource settings that are suitable for remote and underdeveloped regions, which are impacted by arsenic poisoning the most.


arsenic groundwater system
water purification
Directional Solvent Extraction


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.