A new filter to remove Arsenic in drinking water
The ImpAs sorbent is composed of a di-zinc complex immobilised onto an ImpAs resin. This novel material has a high adsorbing capacity which makes it unique for application in point-of-use and point-of-entry water treatment systems to remove arsenic from contaminated water.
Arsenic in drinking water threatens the health of people in over 70 countries. It is estimated that 170 million people are exposed to unsafe levels of arsenic in drinking water above the WHO guideline of 10 ppb.
Methods for arsenic remediation in wide use today are based on adsorption of arsenic on iron oxides. However, iron oxides suffer from fast saturation and poor selectivity, which means they are unsuitable for groundwaters with high concentration of competing anions and leading to the need of large amounts of sorbent. This makes it impractical to apply iron oxides in point of use devices.
ImpAs is a new sorbent material which overcomes these challenges. The sorbent comprises a di-zinc complex immobilised onto an ImpAs resin (solid support) that removes arsenate and has greater regeneration capacity compared to existing sorbents.
- High adsorption capacity for arsenate (i.e. arsenic (V)) from drinking water
- Efficient arsenate remediation at a wide range of pH values (pH 5 to 10)
- High selectivity to arsenate against common competing anions such as bicarbonate and sulphate
- High regenerative capacity
- Ideal resin for point-of-use and point-of-entry water treatment systems due to small amount of sorbent needed.