Woodland Oaks Wastewater Treatment Plant

In March of 2000, the Woodland Oaks Utility Company retained the services of WaterEngineers to design a wastewater treatment plant to replace a 70,000 gpd steel package plant that was operating near its design capacity.  Utilizing the existing limited site, WaterEngineers created a two-phase plan that enabled Woodland Oaks to construct an initial 250,000 gpd concrete wastewater treatment plant adjacent to the existing package plant. Once the new plant was operational, the package plant was removed from the site, which will allow another 250,000 gpd plant to be built when additional capacity is needed.

The plant was designed with an influent fine screen and a selector zone where the influent and return sludge are combined and mixed in an anoxic environment, resulting in reduction of the amount of nitrate discharged to the stream.  The design includes dual aeration basins utilizing fine bubble aeration to conserve electrical power usage, a large circular clarifier, a chlorine contact chamber and dual aerobic digesters.  Two 900 scfm multistage centrifugal blowers are housed in a concrete blower building. Gaseous chlorine solution equipment is utilized for effluent disinfection.

The plant was constructed, fabricated, assembled and installed using non-corrosive materials including reinforced concrete, stainless steel, fiberglass, PVC and hot-dip galvanized steel.  No onsite painting of equipment was necessary, making long-term maintenance requirements minimal.