An Evaluation of Reduction Coagulation Microfiltration and Strong Base Anion Exchange Treatment Process Optimization for Drinking Water Hexavalent Chr

Project: Research project

Project Details

Description

An Evaluation of Reduction Coagulation Microfiltration and Strong Base Anion Exchange Treatment Process Optimization for Drinking Water Hexavalent Chr An Evaluation of Reduction Coagulation Microfiltration and Strong Base Anion Exchange Treatment Process Optimization for Drinking Water Hexavalent Chr The United States Environmental Protection Agency (USEPA) is evaluating the health risk of ingesting hexavalent chromium (Cr(VI)) in order to determine the need for regulating Cr(VI) and California's Office of Health Hazard Assessment has already published a public health goal (PH G) of 0.020 micrograms per liter (ug/l) for C~VI) in drinking water. The California Department of Public Health (CDPH) is in the process of developing a maximum contaminant level (MCl) for C~VI) that will be promulgated in the near future. Interest in Cr(VI) is also prevalent in other States as the issue has been elevated due to congressional actions in 2011. For these reasons, research on Cr(VI) treatment technologies applicable to a wide range of water quality characteristics is needed. This research needs to consider the current treatment facilities that may be in place for treatment of other contaminants (e.g., arsenic) as well as explore newer technology, particularly the ones that could be appropriate for constrained sites available at groundwater production facilities. Coachella Valley Water District (CVWD) relies on groundwater for its' potable water supply serving 4 public water systems. CVWD operates over 100 wells and several groundwater treatment facilities. low levels of Cr(VI) occurs naturally in groundwater throughout most of CVWD's service area and many wells are expected to require treatment if the MCl is set at 20 ug/l or lower. This project is aimed at exploring recent changes to Reduction Coagulation Filtration (RCF) technology that could render this technology worthy of consideration at constrained sites around wells and also research on optimizing the use of strong base anion (SBA) technology for C~V) removal. The new development in the RCF technology based on the findings of WaterRF 4445 includes the use of chlorine for oxidation of remaining ferrous ions (thus requiring considerably less treatment time) and also the use of microfiltration for the removal of precipitates (WaterRF 4365). The research around the SBA optimization is targeted towards reuse of spent brine to minimize disposal volume and thus reduce treatment operational cost. The research plan includes bench and pilot -scale testing. Bench-scale studies, conducted under the guidance of Dr. Paul Westerhoff, will focus on determining the limits on spent brine reuse as well as identifying treatment needs for brine prior to reuse. Pilot-scale testing will be performed to assess the use of ferrous salts, chlorine, and microfiltration for implementing the RCF process at well sites. The pilot testing will be run in parallel to the on-going weak base anion (WBA) exchange pilot testing being conducted for WRF 4445. Conceptual level costs for the cost savings between RCMF (Reduction Coagulation Microfiltration) and RCF in the context of one potential MCl will be developed based on the research findings. Results will be publicly disseminated in a final report, a peer-reviewed publication, and presentations intended for utilities, engineering firms, and the regulatory community. The Principal Investigator on this study will be of Dr. Zaid Chowdhury of . Co-Pis will include Mr. Steve Bigley of CVWD, Dr. Paul Westerhoff of Arizona State University, and Dr. Nicole Blute of Hazen and Sawyer. In this project, CVWD seeks $75,000 from WaterRF. CVWD will provide $75,000 in matching funds and $25,000 for in-kind laboratory and monitoring for a total project budget of $175,000.
StatusFinished
Effective start/end date8/17/138/17/14

Funding

  • Water Research Foundation: $25,000.00

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