Reactive Filtration for
Phosphorus and Metals

The Blue PRO reactive filtration process overcomes a critical obstacle to achieving efficient phosphorus removal in bulk aqueous solutions by providing a very large reactive surface area within the media bed, resulting in guaranteed contact of phosphorus with HFO and its high adsorptive capacity. The adsorptive surface in Blue PRO filters is a continuously regenerated HFO coating that forms on the surface of the sand media. Coagulation followed by physical separations processes (clarifiers, filters, membranes, etc.) simply cannot compare to the efficiency of adsorptive phosphorus removal.

Waste HFO, phosphorus, and solids are removed from the filter through the backwash or reject stream. Recycling this backwash upstream provides the added benefit of phosphorus pre-treatment in primary or secondary treatment systems, further guaranteeing the achievement of the discharge phosphorus target as well as lowering the overall plant chemical ratio. The phosphorus is chemically bound, exiting the site with the plant sludge. Integration of the Blue PRO technology does not require change in the plant's sludge handling system. Blue PRO uses 30% less chemical than comparative technologies for ultra-low phosphorus, therefore producing less sludge. The waste HFO also helps with odor control and can reduce water content in biosolids.

The Blue PRO system is available in several models and configurations. The modular nature of the filters allows for ease of engineering system expansion. The filters are available as freestanding fiberglass or stainless steel units or can be integrated in multi-module concrete cells. Control systems and smaller filters may be mounted on skid systems for mobility or ease of commissioning.