Wastewater
City of Phoenix
Wastewater Treatment Plant
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Digester Rehab
Design & Construction Admin
WCE completed the designs for several cover replacements of the digesters at the City of Phoenix 91st Avenue Wastewater Treatment (WWTP) plant in Tolleson. This treatment plant provides wastewater treatment services for the Sub-Regional Operating Group (SROG) member cities of Glendale, Mesa, Phoenix, Scottsdale, and Tempe, in Maricopa County, Arizona. The facility is a municipal wastewater treatment facility that employs a nitrification/denitrification process to treat municipal and industrial wastewater generated in the metropolitan Phoenix area by the SROG communities, serving a population of over 2 million. The COP 91st Ave WWTP is presently operating at a capacity of about 180 MGD.
Specific processes for sludge treatment at the 91st Avenue WWTP include primary sedimentation (with enhanced sedimentation possible), activated sludge treatment, centrifuge thickening of both primary and waste activated sludge, anaerobic digestion, sludge drying beds, and centrifuge dewatering of digested sludge.
The Digesters that are being evaluated and repaired were put into service around 1980. The metal covers show significant corrosion and the concrete tanks exhibit minor cracks and some leaks in the launder area.
WCE engineers completed the design for the cover replacement on several of the digesters and also did construction administration and daily inspections during construction.
City of Nogales
Meadow Hills Lift Station Improvements
Data Collection & Report
The Meadow Hills lift station experienced frequent issues with pump failures. An extensive on-site visit was conducted. Possible factors contributing to the pump failures were studied and modifications to resolve these issues at the existing lift station were recommended in a report to the City. Recommendations included changes to electrical supply, wet well equipment, alarm system, and other facility areas where additional problems were found.
Sewer Capacity Study
Data Collection & Modeling
Prepare a sewer capacity and master plan study for the main sewers in N Mariposa Rd and Western Ave conveying wastewater from the Extreme West Pressure Zone (EWPZ) in Nogales, AZ to the International Outfall Interceptor (IOI) along Nogales Wash. Sewer flows currently are approaching capacity in some areas of these sewers and additional flows are expected with development in the EWPZ area. The area is predominately rural residential and commercial in current zoning use and is predicted to continue long term. Due to the area’s development and potential use mix, the City desires to model and master plan the expansion of the collection system and conveyance facilities. WCE carried out a systematic review of the sewer segment capacities and compared them with current and expected flows. Sewer as-built information and flow information was entered into a SewerCAD model to show if and where capacities are reached under current flows and under expected flows.
Fairway Drive Sewer Extension
Design & Permitting
Preparation of design contract documents for a sewer extension in North Fairway Drive. This project was challenging due to existing facilities that could not be upgraded without removing existing buildings.
City of Buckeye
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Sundance Wastewater Treatment Facility
Review & Report
Study to review the plant and make recommendations to restore the permitted capacity. The service area flows are expected to increase as home sales return and the plant needs to be able to provide good reliable and economical service to the City. Currently the SBR treatment is underperforming and operational issues from SCADA and PLC errors to equipment errors do not allow the staff to run the plant optimal. Recommendations will include changes to equipment, plant components, operational logic, program updates, and electrical updates.
Town of Wickenburg
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Snowbird Trailer Park Utilities Improvements
Design & Construction
The Snowbird Mobile Home Park has been discharging sewage to on-site septic systems. Population in the park has increased and the disposal facilities have started to fail. The park will be hooked up to the Town of Wickenburg nearby sewer system. The park will also abandon their water supply well and receive water from the Town in the future. Connections to the Town’s utilities and proper abandonment of existing facilities are part of this project.