Arsenic and its compounds have been known to be toxic for millennia. Arsenic trioxide (As2O3), often referred to as white arsenic, was a favored poison in the Middle Ages because it had little odor or taste, enabling it to be easily incorporated into the food or drink of a victim. As little as 300 mg can be fatal to an average person.
Solutions to an age-old threat
Wine producers in the northern California wine country, including Sonoma, Napa, Lake and Mendocino counties, encounter high levels of arsenic in groundwater extracted for use in wine processing and irrigation. These producers must lower arsenic levels to newer drinking water standards set by the U.S. Environmental Protection Agency (EPA) and California’s Department of Health Services. Arsenic removal is also indicated to ensure product safety and to maintain customer confidence in wine products.
Meeting arsenic MCLs in northern California wine country
WQP spoke with Dow Water & Process Solutions Global Senior Application Development Specialist Fredrick W. Vance, Ph.D., about advances in arsenic removal research and the challenges of keeping costs at a minimum, responsible waste handling and continually improving adsorbent media.
LayneRT is an NSF/ANSI Standard 61 certified and approved arsenic removal media. It is a hydrous iron oxide-impregnated resin that efficiently binds arsenic and never needs backwashing. LayneRT was designed for use in the npXtra series of home treatment systems to effectively reduce arsenic. Tanks are connected by a proprietary control head that provides valves for sampling influent and effluent of both tanks.
Groundwater project demonstrates successful arsenic remediation
Arsenic and uranium in drinking water supplies
LayneRT is a hydrous iron oxide impregnated resin that efficiently binds arsenic and never needs backwashing. It is engineered in a single-column design to treat a full cold-water flow so no special low-flow faucet is needed. The POU system provides simple installation and comfortably fits under most sinks. Because system performance is tied to site-specific water chemistry, SolmeteXWater has integrated a comprehensive sampling program into the npXtra system to ensure continued performance. Chemists regularly analyze your customer’s water quality by sending them pre-paid sample kits.