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Dairy Waste Treatment Systems Improve Recycle Quality and Bind Phosphorus
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Pp. 403-407 in Total Maximum Daily Load (TMDL) Environmental Regulations: Proceedings of the March 11-13, 2002 Conference, (Fort Worth, Texas, USA) 701P0102.(doi:10.13031/2013.7587)
Authors: Christopher B. Lind, Donald Gribble
Keywords: Dairy Waste Treatment Systems, Nutrient Inactivation, Phosphorus, Eutrophication, Livestock Waste
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
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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.