Extensive Solutions for Removing Arsenic from Your Drinking Water

June 18, 2020
Arsenic treatment system

If testing indicates that you have unsafe levels of arsenic in your water supply (considered by the U.S. EPA to be 10 parts per billion [ppb]), remember that arsenic is a contaminant with numerous negative health effects on people and should not be taken lightly. There are several treatment methods available to remove arsenic from drinking water and decrease its levels below the limit. Here is a refresher:

Oxidation

Oxidation technologies, using natural air or a chemical compound to expose oxygen to a substance, convert arsenic into another chemical form so that it can be filtered out of the water. This filters out the toxins, including dangerous levels of arsenic, through natural methods of chemical conversion. Water treatment utilizing oxidation is readily available and effective; however, it can potentially be very slow. Luckily, the addition of another non-toxic substance can speed up oxidation, and you can have quicker access to clean, arsenic-free water.

Coagulation and Filtration

Coagulation and filtration involve the use of metal salts, lime and/or iron, and have been effective methods of treatment for decades. This involves dissolving additional compounds into the water, allowing arsenic and other toxic substances that may be present to attach their ions—electricity on an atomic level—to the additives. When this happens, arsenic that would otherwise not be filtered through an ordinary filtration process will have coagulated enough to be caught in the filters. Iron is especially effective in allowing arsenic to coagulate, so many filtration systems rely on the use of iron.

Granular Ferric Oxide

Water treatment systems that use granular ferric oxide (GFO) are considered more advanced and effective technologies for treating and/or removing arsenic from drinking water. GFO reactors are toxin absorbers that function much like any other filter. When used, water directed downward through filters with GFO will be treated and cleansed of dangerous contaminants including arsenic. A simple and safe method, GFO systems are proven to be effective for eliminating arsenic from contaminated water.

Additional Methods

There are additional methods for filtering arsenic out of water, including ion exchange, the use of synthetic membranes, sludge treatments and biological processes that rely on bacteria as a filtration assistance. While some of these methods may be only able to catch a certain percentage of arsenic in water, a customizable treatment system utilizing the right technologies from any of the above can work for your situation.

Read More

About the Weekly Contaminant Roundup: Each week we bring to you headlines from around the world where water contamina
Arsenic and lead and PFAS, oh my! What makes these contaminants spooky? The infographic below has the answers.
This past April 25th marked six years since the city of Flint, Michigan, completed the switch of its water source from Lake Huron to the Flint Rive

STAY CONNECTED

Keep up-to-date with our latest news, developments in the water treatment industry, and some general fun.