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BIODEGRADATION CONSISTS OF A CHANGE OF A CHEMICAL OR GROUP OF MATERIALS BY LIFE PROCESS AS WITH AN ACCOMPANYING TRANSFER OF ENERGY."
Definition proposed by a sub-committee of the standard methods committee for the W.P.C.F.
The conversion of chemicals which are potential environmental pollutants to innocuous substances vTa the biological actipn of living organisms.*
Primary Biodegradation - Minimum alteration of the chemical structure of the material .in question . to an extent that the characteristic properties of the original material are no longer evident.
Ultimate Biodegradation -.Complete conversion of the material in question to CO2 H^O, inorganic salts, and products normally associated with the natural metabolic processes of.living organisms.
NEV 0269 7 740242
"Develop a laboratory test procedure which will' measure the susceptibility of selected Organic Division Products to primary biodegradation via the biological action of' bacterial Furthermore, the procedure should produce results in a reasonable period
of time at a reasonable cos_t which can.be easily extrapolated to the"environment!"
Potential Environmental _____Pollutants
Selected Organic Division Products
Living Organisms
Bacteria
Conversion
- Primary Biodegradation
Mixed Bacterial Population
or Pure Bacterial Culture
Mixed Foods Aerobic
or Sole Carbon Source **
or Anaerobic ((DSilfofwiercult
/ River Die-Away Test ('HXIO cells/ml) .
Fortified and Inoculated Water .Test
Shake Culture Test
,
Laboratory Trickling Filters
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Continuous Flow Activated Sludge
Batch Sludge pie Away
. / Semi-Continuous Activated Sludge (2X10 cells/ml)
/ Soil Percolation .
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