CRYSTAL LAKE

Crystal Lake Flocculation System

Robbinsdale, MN

The Crystal Lake Flocculation System is designed to remove phosphorous, which is introduced into Crystal Lake from storm water shed from the Minneapolis and the Robbinsdale area. The elevated concentrations of phosphorous eventually promote excessive algae blooms leading to diminished water quality and reducing the wildlife quality of the lake. The Flocculation system is designed to operate seasonally, on an as needed basis. Phosphorous will be precipitated out of the lake water and segregated in the clarifier and directed to the City of Minneapolis sanitary sewer system. The lake water will be reintroduced into Crystal Lake.

Owner: City of Robbinsdale

Contractor: Belair Sitework Services

Project Facts:

• Over 1,500 LF of 8” and 12” HDPE pipe was set on the lake bottom.

• A dewatering system was installed with multiple points to drop the water table elevation for the construction of the clarifier.

• A pre-fabricated chemical feed building (15’x38’) was placed on-site to facilitate an accelerated start-up.