Agua Nueva Water Reclamation Facility (ANWRF)

Approach

  • Innovative treatment process using DAF clarification and 5-stage Bardenpho, enhanced with step-feed capabilities. This process is then followed by deep tank secondary clarification.
  • The DBO contract was awarded to CH2M on December 7, 2010, for $164 million (32 percent lower than the budget cap of $240 million).

The initial capacity of the new facility will be 32 MGD based on annual average daily flow. Provisions will be made for an ultimate capacity of 48 MGD.

CH2M HILL (now Jacobs) will operate the facility for 20 years. The Agua Nueva Water Reclamation Facility (ANWRF) Project consists of the design, construction, acceptance testing, operation and maintenance (including all capital maintenance) of a new 32 MGD Water Reclamation Facility at the new PCRWRD Water Reclamation Campus. In addition to the facility, the project capital improvements include:

  • an Influent pipeline from the facility to the county’s plant interconnect,
  • an effluent pipeline from the facility to the county’s existing Santa Cruz River outfall,
  • a primary sludge line from the facility to the county’s existing sludge transfer pipeline,
  • a bypass sludge line from the facility to the plant interconnect, and
  • all related capital improvements.

The initial capacity of the new facility is 32 MGD based on annual average daily flow. Provisions will be made for an ultimate capacity of 48 MGD.

CH2M HILL (now Jacobs) delivered a treatment process using DAF clarification and 5-stage Bardenpho, enhanced with step-feed capabilities. This process is then followed by deep tank secondary clarification. Our odor control solution consists of two separate systems, a centralized odor control biofilter system, and a dual bed carbon absorption system. This solution treats odors to an expected level of 5 D/T and offers low lifecycle cost and exceptional performance.

The site layout allows room for expansion for improvements to support future growth of Pima County, Arizona, and the corresponding increase in customers served by the county’s wastewater system. The County has chosen to use a design-build-operate (DBO) project delivery approach to secure substantial benefits for its customers. These benefits include:

  • timely, efficient, and cost-effective scheduling,
  • optimal risk allocation,
  • competitive design selection,
  • clear assignment of performance responsibilities to a single contracting entity,
  • long-term project operations and maintenance efficiencies, and
  • cost savings beyond those anticipated using the traditional design-bid-build project delivery method with operational responsibility maintained by the County under its operations program.

CH2M (now Jacobs) has 100 percent responsibility, with its strategic delivery partner Archer Western Construction, for delivery of the ANWRF project. CH2M (now Jacobs) delivered the ANWRF using our industry unique, single-entity, integrated design-build-operate (DBO) approach. CH2M (now Jacobs) was the lead design professional engineering firm, the firm primarily responsible for the construction of the facility, and the long-term operator of the facility.

Results

With well over 1,000,000 man-hours delivered with only a single recordable incident (TRI) and no lost time (DART), the ANWRF went into full operations in August 2014. This project went on to win 12 industry awards, most notably two of the highest DBIA honors (Design-Build Institute of America), the “” 2014 DBIA National Award of Excellence in Process”” and the “”2014 DBIA National Award of Excellence in Water/Wastewater.”