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Nutrient inactivation as a component of stormwater treatment, and lake restoration has been used for over thirty years. Binding of phosphorus into a form that is not bioavailable can be an essential part of watershed management. Algae have no roots and thus require all nutrients to be soluble. The difference between a eutrophic water and pristine water is as little as 30-ppb phosphorusthus a small reduction in phosphorus loading can have a dramatic water quality impact.

A review of phosphorus precipitants and nutrient inactivation and interceptions applications will be presented. Considerations for choosing which of the most common phosphorus binding compounds aluminum sulfate, aluminum chloride, ferric sulfate, ferric chloride and calcium compounds will be discussed.

In animal growing operations that produce liquid waste streams like swine, dairy and cattle feeding the challenges of strong waste with high but intermittent flow demand innovative technology not common to traditional waste systems. In dairy flush water, the fibrous material has value as recycled bedding material. Ideally the system for treating dairy flush water will be durable, simple to install and use, capable of recovering fiber while removing phosphorus and clarifying the water. Additional physical or biological treatment components can be added to effect solids disposal, nitrification, denitrification, and ammonia and BOD removal.

A system to recover fiber and treat the flush water stream will be presented. A redesign of a successful flush system with over 2000 existing installations nationwide. The presented design is suitable for retrofit of existing treatment units and well as new installations. Case studies of poultry waste, cattle feed lot and dairy flush water treatment systems that have produced up to 94% phosphorus removal will be presented to verify the technology.