Case Study | January 16, 2009

Case Study: Fine Screen Retrofit Cuts Upgrade Costs By $1M

Source: JWC Environmental

To preserve Hawaii's natural beauty, keep up with growth and ensure regulatory compliance, the US Army Schofield Barracks, Hawaii's largest Army post, recently upgraded their wastewater treatment facility located on the island of Oahu. The result was improved efficiency and water quality, and decreased environmental impact on the region.

The project was spearheaded by Aqua Engineers of Kauai following a contract with the Army to privatize the facility. Key to the project's ultimate success was technology from JWC Environmental, Costa Mesa, California and GE Water and Process Technologies, a unit of General Electric Company.

Wayne White, Aqua Engineer's Plant Engineer for Schofield, explained that goals for the upgrade were specific and challenging. "We needed to upgrade the plant from R2 quality effluent to R1 quality effluent suitable for re-use in agriculture and irrigation applications," says White. "We also needed to increase plant capacity by roughly 30% - from 3.2 to 4.2 million gallons per day (MGD). An additional requirement to provide surge capacity of 15 MGD to handle Oahu's frequent rainstorms further increased the design challenge. And, the total project was to be completed without major capital expenditure."

Aqua Engineers recommended General Electric's ZeeWeed® Membrane Bioreactor (MBR) technology to achieve the R1 quality effluent desired. This advanced wastewater treatment system combines rugged hollow-fiber, ultrafiltration membranes with biological processes resulting in superior effluent quality and reduced chemical consumption. As specified by the membrane manufacturer, the MBR required 2mm screening in front of the membranes in order to protect them from clogging and damage.

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