If imitation is the sincerest form of flattery, Mother Nature must be pleased. Nature’s system of wastewater treatment through rivers,lakes and streams is simple: heavy particles settle to the bottom, lighter particles float to the top where microorganisms feed and further breakdown the particles. These microorganisms become larger and eventually settle to the bottom of the bed. Water is eventually soaked up by the riverbed and filtered through layers of rock into the underground water supply. It’s an excellent process but not efficient for our large population. What can take up to one year naturally, can take less than one work day scientifically. Our modern treatment plants can take wastewater through the tertiary treatment phase in less than eight hours using Mother Nature’s basic principles.

Spotlight: Wastewater Treatment Projects

City of Manteca – Industrial Pipeline Treatment Facilities
Manteca, California

A wet well pump station was installed to facilitate distribution of the effluent. A new electric service was installed to power the pumps, motor-operated valves, and floating aerators. The new electrical controls for these devices were integrated with the existing plant control system. Design of wastewater treatment facilities for industrial cannery waste consisting of:

  • (1) 20HP aerator
  • (2) 7.5HP influent pumps
  • PLC-based controls/HMI interface
  • Instrumentation

City of Burlingame – Mitten Road Pump Station
Burlingame, California

This project included installing a temporary sewage bypass system to isolate an existing sewage lift station. The new work includes demolition of existing mechanical and electrical systems, providing and installing new submersible pumps, motors, and piping systems, connection to an existing sewer force main, protective lining within the existing wet well, furnish and install new motor control center and related electrical including providing new 480 volt electrical service.EETS provided design services for the replacement of all existing fixed speed pumps with new VFD-driven pumps. Provisions were made for a future emergency-added via a new automatic transfer switch (ATS).


City of Manteca Wastewater Treatment Plant
Manteca, California

Design of major plant expansion to 25MGD including:

  • Distributed PLC-based controls (Modicon Quantum & Momentum) and instrumentation for new and existing plant facilities
  • SCADA/HMI system (Intellution iFix) with Ethernet over fiber LAN
  • Influent pump station (1200HP), headworks and biofilters
  • Primary treatment facilities
  • Aeration basins with combined blower capacity of 1650HP
  • UV disinfection facility
  • Anaerobic digester and control building with co-generation facilities
  • Clarifier and RAS/WAS facilities and centrifuge sludge de-watering facilities
  • Irrigation and effluent pumping
  • 17kV medium voltage loop service distribution system throughout plant with
  • (7) 2000kVA padmount transformers
  • (5) 1500kW emergency generators with paralleling capability over fiber optic network &17kV emergency tie

United States Marine Corps Sewage Treatment Plant #2
Camp Pendleton, California

This project was part of the military’s attempt to replace World War II vintage sewer treatmet technology with modern technology. Not only will this project be more efficient and thorough, it will also help protect the fragile Santa Margarita River basin. EETS engineers were asked to design the following:

  • 1.0MGD wastewater treatment plant
  • 17kV primary service
  • 4.50kW digester gas co-generation unit.