Utilizing HACCP in a Carbon-Based Treatment Process for Managed Aquifer Recharge
- Troy Walker - Hazen and Sawyer
Hampton Roads Sanitation District (HRSD) is in the process of completing Phase 3 of the Sustainable Water Initiative for Tomorrow (SWIFT) program which includes the design, construction, and operation of the SWIFT Research Center; a nominal 1 mgd advanced water treatment and research facility. The objectives of the facility are to demonstrate that the advanced treatment process that was selected during the piloting phase will produce finished water that meets primary drinking water standards and is compatible with the groundwater chemistry and to monitor the aquifer’s hydraulic response. The facility will serve as a research center and outreach facility, and provide a platform for operator training and process optimization. HRSD will collect at least 18 months of treatment and aquifer hydraulic response data during the operation of the facility to optimize the design of full-scale advanced treatment and to define future permitting requirements. This presentation will highlight how the project team used the hazard analysis and critical control point (HACCP) methodology to provide a design, monitoring, and operations framework for the scale-up of the carbon-based advanced treatment process from a pilot scale system to a 1 mgd treatment system that will be recharging the aquifer with highly treated finished water. The presentation will include an overview of the HACCP methodology and how it is used to identify, manage, and provide real-time validation of multiple treatment barriers along the treatment train that are installed to protect public health. The presentation will discuss the selection of the on-line monitoring parameters used to validate the treatment barriers and the procedures implemented to take corrective action when monitored parameters are out of range. We will show how procedures were developed to verify that the monitoring systems work effectively and how outcomes of the HACCP methodology were integrated into process operations, operator training, and documentation standards and were tested and optimized to further refine the methodology for full scale implementation.
HRSD has the capacity to treat up to 249 mgd of wastewater and serves a population of nearly 1.7 million people in the southeastern region of Virginia. HRSD has developed and is advancing its SWIFT Program which provides an innovative solution for managing regulatory requirements while addressing many of the region’s water challenges. The multi-phase SWIFT Program will add advanced treatment processes to up to seven of HRSD’s wastewater treatment facilities to produce water that exceeds drinking water standards and is compatible with the receiving aquifer. At full-scale, the SWIFT program will significantly reduce nutrient loading to the sensitive Chesapeake Bay, limit saltwater intrusion into the Potomac aquifer, reduce land subsidence, and provide a sustainable source of groundwater, a necessity for continued economic expansion of the region.
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