Wildcat WRP Capacity

Wildcat Hill WRP aerial shot

Objective 2: Address Wildcat Hill Water Reclamation Plant Bio Solids Capacity

Relevant Standards

  • Uninterrupted wastewater and reclaimed water services
  • Adequate collection, treatment, and disposal capacity for current and future customers
  • Maintain wet-weather capacity in compliance with regulatory requirements
  • Efficient and cost-effective approach to maintaining assets, data-driven decision making
  • Comply with current regulations and prepare for future regulations

Background

In 2008, the Division upgraded the Wildcat Hill Water Reclamation Plant’s filtration systems to produce Class A+ reclaimed water. At that time, it was decided not to add additional digester or hydraulic capacity to save costs. Digesters treat the solids in wastewater and provide the means to create Class B Sludge, which can be applied locally on City owned land. It was decided at that time not to increase the hydraulic capacity of the Wildcat Facility.

Challenge/Opportunity

  • The treatment plant has reached its capacity with respect to processing solids.
  • The amount of water arriving at the plant has reduced over time due to various factors, including water conservation, which means the wastewater is more concentrated, changing plant optimization parameters.
  • There is no redundancy in the plant with respect to many processes, including solids processing.
  • Failure of the current digesters would force the City to send sludge to the landfill, increasing costs by approximately $240,000 per year.

Timing Concerns

The timeline for planning, designing, and constructing a new digestor is 2024, with additional flow diversion to Rio de Flag WRP. Barring measures to buy more time, this process needs to start now to ensure adequate future capacity and avoid compliance issues with the Arizona Department of Environmental Quality

 

Water Services Strategic Plan 2025                                                                             2021 Accomplishments

Objective 2: Address Wildcat Hill Water Reclamation

Plant Capacity

Reporting Period:

January - June 2021

 

Specific Responses

Champion & TEAM

Accomplishments

Next Steps

Look for options to buy time by increasing the effective capacity of the current digesters

Engineering Manager, Water Reclamation Manager

Working on wastewater story to be

presented to council later this year

PM still needs to go to Council for Award of Design Contract. Design to begin in next 6 months.

Continuing assessing plant risks

(points of failure and time to repair the failure) and implementing mitigation measures to increase reliability

 

Water Reclamation Manager

Completed plans for grease and

septage receiving, Working on Plans for PEPS pump station

This work has been

completed.

Perform a cost/benefit analysis on

providing redundancy in filtration or solids processing

 

This work is on hold

 

Review conservation goals, projected growth, and future reclaimed water demands to develop the optimum plant parameters and timing for plant upgrades

 

In progress

Working with a consultant on this project

Water Services Strategic Plan 20252020 Accomplishments
Objective 2: Address Wildcat Hill Water Reclamation Plant CapacityReporting Period:                January-June 2020Reporting Period:          July-December 2020
 Specific ResponsesChampion & TEAMAccomplishmentsAccomplishments Next Steps
Look for options to buy time by increasing the effective capacity of the current digestersEngineering Manager, Water Reclamation  ManagerPreparing draft scope of work for 2 New Digesters to increase capacity  at WCHRSOQ for Design services has been completed and provided to Purchasing Department for solicitation of bid.. Mac McNamara is Engineering is the City Project Manager delivering this project. PM still needs to go to Council for Award of Design Contract.Design to begin in next 6 months.  
Continuing assessing plant risks (points of failure and time to repair the failure) and implementing mitigation measures to increase reliabilityWater Reclamation ManagerReplaced primary weir supports and grit lines at RDF WRPCompleted constructing bypass line at headworks to primary system in December 2020This work has been completed.
Perform a cost/benefit analysis on providing redundancy in filtration or solids processing
Issued PO to Carollo for Sewer flow measurement at RDF. Awaiting return of normal sewer flows in system. Currently down 1 MGD due to Covid 19.This work is on hold
Review conservation goals, projected growth, and future reclaimed water demands to develop the optimum plant parameters and timing for plant upgradesWater Reclamation ManagerReclaimed Water Master plan in progress In progressWorking with a consultant on this project