Water Pollution Technologies

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Vegetative filters

A vegetative filter is a grassy area that receives rainfall runoff from an open livestock feedlot. It separates nutrients from the lot runoff and provides an infiltration area for the runoff water so that no discharge occurs.


Digesters

Waste falls through slats on the CAFO floor and is then flushed into the digester where it is decomposed for three weeks, producing methane that can be used for energy.


Good management of solid and liquid waste (especially in pasture systems)

For example, an appropriate number of animals given resources (to reduce contaminated water and manure build-up); use of crop cover to slow runoff; keeping feed and water areas away from domestic water sources; diverting uncontaminated water away from CAFOs/lagoons to prevent excess strain on system; removing of waste solids from liquids to lessen load; efficient treatment of contaminated water


Sequencing Batch Reactor (SBR)

This is a wastewater treatment process. SBR reactors treat wastewater such as sewage or output from anaerobic digesters or mechanical biological treatment facilities in batches. Oxygen is bubbled through the mixture of wastewater and activated sludge to reduce the organic matter, measured as biochemical oxygen demand (BOD). The BOD (biochemical oxygen demand) and nutrient removal efficiency is between 85-95%. The SBR system is beneficial because all the steps to cleaning the water are contained within the one tank. In addition, it has the ability to work in many different operating conditions so it opens up the possibility for differing levels of treatment if needed. Furthermore, the system leaves a very small environmental footprint. The equipment costs can be between $94,000-1,170,000 depending on the design flow rate which can range from 0.012-4.25. The cost per gallon of water treated is on average $2.