Blue PRO® uses reactive filtration to lower phosphorus to extremely low levels. Reactive filtration features continuous regeneration of reactive filter media within a moving bed filter.

A hydrous ferric oxide (HFO) coating is formed on the media surface, abraded away within the filter, and continuously regenerated. Waste particulates, including the iron and phosphorus, are continuously separated from the process flow.

HFO allows adsorption of phosphorus to extremely low levels. This removal mechanism is more efficient than coagulation-filtration for removing contaminants to extremely low levels. Through adsorption Blue PRO® is able to achieve total phosphorus levels <0.010 mg/L.

TERTIARY TREATMENT WITH SEVERAL ADVANTAGES

Blue PRO® systems are available in a number of configurations to accommodate any system size or phosphorus regulation. The filters are available as free-standing fiberglass units or as concrete installations. Smaller units may be mounted on skid systems for mobility. The modular nature of the filters allows easy system expansion.

Single-pass systems may meet total phosphorus regulations as low as 0.1 mg/L, depending on the influent concentration. Lower limits are achieved with two-pass systems, and reject recycle. With these alternative configurations, full-scale installations have reached <0.010 mg/L. Blue Water maintains an active research program to continually improve performance for limit-of-technology phosphorus removal results.

Reject recycle refers to the return of process residuals to an earlier point in a wastewater plant. Blue PRO® reject particulates contain significant adsorptive capacity. Recycling this material can achieve significant additional phosphorus reduction through the plant's secondary system, further reducing the final effluent phosphorus concentration. Phosphorus is not released in the secondary system or through digestion. No change is required in the plant's sludge handling system, plus the iron helps control odor and may produce a drier biosolid.

The Blue PRO® filters may also be used for denitrification, and this application may be combined with phosphorus removal. Nutrient removal projects are currently installed around the country. In addition, pilot projects are currently operating in several different states. Contact Blue Water for information about piloting at your location.