Construction, Start-up, and Initial Water Quality Data Collection of a 6.75-mgd MIEX® Facility
Authors:
- Russell Jones - Hazen and Sawyer
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Also read a related article in the Winter 2010 issue of Horizons.
Many utilities are turning to advanced treatment processes, such as MIEX®, to ensure compliance with the Stage 2 Disinfectant/Disinfection Byproducts (DBP) Rule. Construction of a new 6.75-MGD MIEX® facility has recently been completed at the Johnston County WTP in Wilson Mills, North Carolina. Early data collected on TOC and DOC levels both upstream and downstream from MIEX® treatment is showing promising results to address DBP formation in the County’s water distribution system.
In this paper the Owner will present their perspective on the procurement, construction management, and performance of the Miex Facility and the ion exchange process to date. The County purchased the equipment for the Miex Facility and resin inventory under a separate contract with Orica. The Miex Facility was designed, contract documents were developed, and the project was bid under a conventional design/bid scenario with the low-bid Contractor selected to install the Miex equipment purchased by Johnston County.
The County performed construction management for the project with assistance from the design engineer. Construction was completed with ARRA funding over one-year period, and the facility was completed in February 2011. Start up of the Miex Facility began in February 2011 and the Johnston County staff conducted start-up services, working closely with Orica staff – to initiate the Miex treatment process at the WTP. The Owner’s staff will elaborate on their responsibilities during start-up and on the learning curve to understand and implement the process nuances.
Along with the Owner’s discussion of construction and start-up of Miex, they have collected data on operation of Miex Facility and water quality parameters on performance of the process. This data includes quantity of raw water treated, resin regeneration rates, bulk salt added, and bulk resin added. Water quality data presented will include raw and treated water levels of UVA254, turbidity, TOC, and DOC levels. Also, water samples have been collected in the distribution system, and DBP data will also be presented.
This presentation will show from the Owner’s perspective – the Miex Facility project, starting from procurement through construction and to Miex system start-up. Also, the paper will present data from the initial start-up of the Miex system, and the performance of Miex in lowering TOC to address the problems associated with DBP formation and nitrification in the County’s water distribution system.
To request a copy of the full paper, please contact the author at .(JavaScript must be enabled to view this email address).
