Perchlorate and Arsenic Treatment Alternatives Evaluation

Magna Water Company, 
Utah

Perchlorate and Arsenic Treatment Alternatives Evaluation

Project Highlights: 
  • Evaluation of ion exchange, RO, and EDR for perchlorate treatment.
  • Detailed perchlorate cost estimates.
  • Evaluation of negative impact of in-situ biological perchlorate treatment for downstream wells.
Increased perchlorate removal based on groundwater model projections.
Future water demands and the need for increased perchlorate removal based on groundwater model projections were performed by Carollo’s team.

Magna Water Company (MWC) retained Carollo Engineers to provide engineering services to evaluate the potential synergies of removing perchlorate and arsenic in one facility using electrodialysis reversal (EDR) or other viable technology. Carollo reviewed prior perchlorate removal/treatment alternatives evaluated in the Well Water Treatment Alternatives, 2000 report including reverse osmosis (RO), EDR, and ion exchange (IX) in order to evaluate the most viable/economical process for combined perchlorate and arsenic treatment. A series of workshops were conducted where Carollo and MWC staff reviewed possible treatment processes and worked together to develop three different alternatives for treating perchlorate and arsenic at Magna’s well fields. Using updated water demand projections, a treatment facility plan was developed for each alternative incorporating the flow capacity of both of MWC’s well fields. A phasing plan for the water treatment plant and ancillary facilities was developed for the next 20 years to incorporate future water demands and the need for increased perchlorate removal based on groundwater model projections and blended arsenic water quality goals. Capital, operating, and lifecycle costs were developed for each alternative in order to evaluate the least cost alternative for treating perchlorate and arsenic.

As part of this project, IX computer modeling (IX Pro) was conducted to simulate the performance of selective (throw-away) IX resins for removing perchlorate only at Magna’s Barton Well Field. Carollo compiled recent physical/chemical data, conducted modeling analysis and coordinated modeling results with IX equipment suppliers to determine recommended facility layouts, and equipment/operating costs.