BIOLOGICAL OXYGEN DEMAND (BOD)BOD refers to the content of biodegradable organic matter in wastewater, expressed as the quantity of oxygen needed by the micro-organisms that are carrying out the degradation process, in a five-day test. It is a measure of the degree to which the dissolved oxygen in the bodies of water receiving the wastewater would be reduced, thereby resulting in possible negative environmental impact.
BIOLOGICAL OXIDATIONThis is the phase during which polluted waters are purified, by biological means, of organic contaminants. The organic substances are oxidized by aerobic bacteria that, in the presence of oxygen, transform them into carbon dioxide and water. The oxygen necessary to the process can be provided by one of two techniques:
Injected directly into the basin, in the form of air or pure oxygen, using special diffusers; Supplied via direct exchange, again in the form of air or pure oxygen, through the use of turbine aerators that maintain a constant contact between a mass of moving water and the air or pure oxygen. In this case, the basins are covered and airtight.
CHEMICAL OXYGEN DEMAND (COD)COD is a measure of the quantity of oxygen utilized to oxidize organic and inorganic substances in a water sample treated with powerful oxidants. This parameter, like BOD, is used primarily to estimate the organic content, and thus the potential level of pollution, in natural water and wastewater. A high COD level in wastewater means a reduction of the dissolved oxygen in the body of water that is to receive the wastewater and a reduction in the ability of that body of water to purify itself and sustain life forms.
All intensive livestock farmers have to collect dirty water run off from yards and muck pads. This water has to stored before it is distributed onto the land. As I understand it their are only certain times of the year when this can be disposed of, and these are the wet months.
The cost of disposal for Mr Belll (owner of this lagoon) averages about £500.00 per month, depending on rain fall, he hires a man with a tanker to take it away.
There is legislation on the way about waste handling and movement and disposal licences etc. (Without doubt this will push up costs.). If this treatment works, the running cost is likely to be £50.00 per month.
If we can devise a way to extract the foam then we're onto a winner!
