El Estero Wastewater Treatment Plant Improvements

Tertiary Filtration Replacement. This $8.4M project upgraded the City’s recycled water program to allow for the production of up to 3 million gallons per day (MGD) of Title 22 water for their recycled water customers. The treatment plant’s existing filtration system was replaced with an ultrafiltration (UF) facility. Project work included demolishing an existing gravity sand filter; installing driven concrete piles; constructing a new UF facility (consisting of a universal skid design that enables future changes of the membrane modules to a different membrane manufacturer if desired), new filter feed pumps, and new reclaimed water transfer pumps; replacing chemical feed pumps; and modifying the chlorine contact basin, reclaimed water storage reservoir, yard piping, associated electrical and instrumentation, and other appurtenant work.

Due to the historic drought, schedule and timely completion were imperative. MNS worked proactively to overcome design challenges and unforeseen conditions to mitigate several issues with the potential to delay project completion. MNS’ construction management services for this project included project management, resident engineering, and construction inspection. MNS also delivered the site civil improvements design.

Secondary Process Improvements. This $22.6M project converted the existing conventional activated sludge process to biological denitrification. These improvements increased the quality of secondary effluent feed to the new UF facility.