Sienna Regional MUD –
Wastewater System
Regional Improvements

Pape-Dawson was responsible for design, bid, and construction phase services for a new 1.8-MGD membrane bioreactor (MBR) wastewater treatment plant with ultimate 3-MGD treatment capacity.

Phase I included an on-site lift station, headworks, screening, grit removal, biological nitrogen and phosphorus removal, dissolved oxygen control, permeate pumps, chemical feed, blowers, sludge dewatering, and UV disinfection basins.

Phase II expanded the plant capacity to 2.4 MGD, including a third treatment train, additional sludge holding basin, and second reclaimed storage tank.

The project also includes non-potable water storage and connection to a purple pipe irrigation distribution system. Pape-Dawson designed the installation of one bolted glass-lined storage tank initially, in Phase I, with provisions for two future ground storage tanks (GST). Bid alternatives were considered for both welded-steel and glass-lined bolted tanks to obtain the most cost-effective option. Reclaimed improvements included transfer pumps at the UV disinfection basin, horizontal split case booster pumps, and a hydropneumatic tank with room for expansion.

Project Type

Water & Wastewater

Project Sub-Type

Wastewater
Treatment Design