Finding an appropriate solution to address arsenic in raw water can be challenging for utilities. Studies have shown that when ingested in high concentrations, it is linked to cancer in the skin, lungs, bladder and kidney, and can cause significant skin changes, such as thickening and pigmentation, as well as other health issues. For this reason, the U.S. Environmental Protection Agency (EPA) has a maximum contaminant level standard of 0.01 mg/L. Throughout the country, municipalities are looking for ways to remove arsenic found in drinking water sources to EPA standards. Three separate water utilities found the answer to their concerns in AdEdge Water Technologies’ solutions.
1. AD26 Oxidation/Filtration System for Arsenic Removal
In March 2009, Indian Health Services (IHS) needed a solution to remove the high levels of arsenic (0.23 mg/L) and uranium (0.047 mg/L) present in raw water that would eventually be distributed to the Campbell Ranch Community in Nevada. IHS contacted AdEdge Water Technologies to design, manufacture and start up an arsenic and uranium treatment system.
AdEdge deployed its AD26 oxidation/filtration system, engineered for the removal of iron, manganese, hydrogen sulfide and arsenic. The two systems utilize AdEdge’s integrated oxidation filtration technology, which employs a proprietary manganese dioxide media, packaged in a pre-engineered, skid-mounted treatment system. Contaminants are co-precipitated and filtered in the media bed, which is periodically backwashed.
After the system was installed in May 2012, the arsenic and uranium concentrations were lowered to below the EPA MCLs.
2-3. WaterPOD Containerized Treatment Units for Arsenic Removal
AdEdge also offers WaterPOD containerized treatment units for those utilities that need a cost-effective modular water treatment solution with a small footprint. This was the case for Spring Creek Utilities in Spring Creek, Nev., and the Quilicura municipality in Quilicura, Chile (pictured above). Both utilities were dealing with raw water that had arsenic levels well above the EPA standard as well as challenges with pH.
The utilities selected WaterPOD containerized units to address their contaminant and pH concerns. The modular enclosures contain any one of AdEdge’s many types of packaged units or APUs, are available in either 20-ft or 40-ft lengths, and can be single, double or multiple units combined to accommodate design flows of up to 2,000 gpm or more. Each WaterPOD houses an ADGS+ coagulation/filtration arsenic removal system, which has chlorine modules that are used to oxidize arsenic (III) to arsenic (V) for optimal removal.
After the systems were deployed, both locations reported the contaminant at non-detect levels and a neutral pH of 7.