Water treatment system removes arsenic, iron, manganese from Canadian resort village
In November 2009, AdEdge Water Technologies LLC was selected by the Resort Village of Kannata Valley (RVKV) to supply an arsenic, iron, manganese and turbidity treatment system for its community in Silton, Saskatchewan, Canada. Prior to selection, AdEdge worked with its local representative, the Water Clinic, on piloting the system that was chosen. The water system currently uses one 132 gal per minute (gpm) artesian well that serves potable water to 260 connections.
Several options were considered based on the need to remove the 1.7 to 2.14 mg/L of iron and arsenic from 31 parts per billion (ppb) to below the new maximum contaminant level (MCL) of 10 ppb. An AD26 oxidation/filtration system was selected as the best overall approach to simultaneously remove both contaminants while having a small footprint. Work was closely coordinated with the RVKV and its consultant to design and permit the treatment system. The AdEdge scope of work included system design, supply and startup assistance. The AdEdge treatment system was selected based on overall cost, the small footprint of the design and the simplicity of system operation.
The Treatment System
The AD26 treatment system train consists of one skid-mounted triplex-packaged treatment system with three vessels in parallel to treat up to 150 gpm. A design filtration rate of 3.98 gpm/sq ft was chosen to allow for filtration of the high level of contaminants including turbidity in a range of 6.34 to 12.0 NTU. The packaged AD26 system utilizes an NSF 61-certified manganese dioxide media (AD26) that is ideal for co-contaminant removal. The automated system, equipped with a PLC, automated butterfly valves and control panel, is integrated with chlorine addition and monitoring for process control and disinfection purposes.
The system also includes air wash and complete backwash recycle, providing a treatment system with zero discharge. The system is pre-engineered, pre-piped and skid mounted for ease of installation and operation. A continuous free chlorine monitor on the system allows the operator to maintain desired disinfection residual in the distribution system. AD26 technology has been deployed successfully on many high-arsenic, -iron and -manganese wells to date, as well as on five full-scale U.S. Environmental Protection Agency (EPA) arsenic demonstration projects.
Since operations began, the system has consistently met all the EPA MCLs for arsenic, iron and manganese. Arsenic in the treated water has been recorded consistently below detection (less than 2 ppb) and turbidity to 0.014 NTU. Monitoring and periodic sampling of the system is performed by the site’s certified operator in accordance with the operating permit.
Joseph Naylor is marketing manager for AdEdge Water Technologies LLC. Naylor can be reached at [email protected] or 1.866.823.3343.