Sediment-Laden Construction Site Water

A home builder in the City of Rocklin, California was concerned about a storm water basin on their construction project that contained sediment-laden water.  The water sat for several months and still was not clean enough to discharge.  The builder contacted Rain for Rent for a filtration solution.

The water was tested and the sediment was found to be highly colloidal and would require treatment, combined with filtration, to meet NPDES discharge requirements. 

Rain for Rent's filtration specialist designed a system utilizing a 48-4 sand media filter, a weir tank, a DV-100 4-inch pump, a 3-RB 3-inch pump, a filter box, Spillguards, and an organic polymer to aid in the filtration process.  The DV-100 pulled the water from the pond and pumped the water through a valve equipped with a Mazzei™ injector that injected the polymer. This process helped mix the bio-polymer into the water.  The treated water was then discharged to the weir tank. 

 The polymer began to react immediately with the sediment in the water.  As the water flowed over the second weir, it was visibly cleaner.  From the weir tank, the water was pumped to the sand media filter where the remaining sediment was captured.  The water that was discharged from the sand media filter looked as clean as drinking water.  The Regional Water Quality Control Board and our client observed the project and were satisfied with Rain for Rent's filtration performance.