Process Improvements Project at the Utah Valley Water Treatment Plant

Central Utah Water Conservancy District, 
Utah

Process Improvements Project at the Utah Valley Water Treatment Plant

Service Type: 
Project Highlights: 
  • Coordination of District bench- and pilot-scale testing to evaluate treatment alternatives to improve water quality and plant performance.
  • Optimization of ozone dosing requirements to minimize new solids handling facilities.
  • Incorporated existing facilities in challenging site constraints to allow for future expansion to 120 mgd.
  • Design of new ozone feed and contacting facilities for DBP reduction and taste and odor control.
Utah Valley WTP aerial
Design components of the Central Utah Water Conservancy District's ozone facility at the Utah Valley WTP include a 13,000-gallon LOX storage and vaporization system, three 590-ppd generators, side-stream injection system, two 12-minute ozone contactors with associated destruct units, and chemical storage and feed for ozone quenching.

Central Utah Water Conservancy District selected Carollo to provide engineering services for the Process Improvement Project at the Utah Valley WTP (UVWTP). The UVWTP is an 80-mgd direct filtration plant that has plans to expand to 120 mgd in the future. Water quality challenges and changing regulations required the plant to evaluate alternative methods for total organic carbon (TOC) removal to lower subsequent disinfection by products (DBPs). Bench- and pilot-scale testing has shown that ozone and/or enhanced coagulation can adequately remove TOC to significantly reduce subsequent DBPs to meet treatment goals and water quality regulations.

Design components of the ozone facility include a 13,000-gallon LOX storage and vaporization system, three 590-ppd generators, side-stream injection system, two 12-minute ozone contactors with associated destruct units, and chemical storage and feed for ozone quenching. The facility will provide provisions for future expansion to 120 mgd as well as considerations for ozone augmented biofiltration. The scope of work also included pre-selection of an ozone system supplier to facilitate in the design of the facilities. Challenges of the project included site constraints that required addition of the new ozone facilities, additional flocculation and new sedimentation basins while maintaining space for future expansion.

Other design efforts included hydraulic evaluation and improvements to plant filters, modifications to the waste washwater and filter-to-waste handling facilities, upgraded chemical feed and storage areas, and solids handling facilities.

In addition to preliminary and final design services, Carollo will provide assistance for pre-selection of contractors and bidding, as well as engineering services for construction and startup phases of the project.