Chemistry: fertilizers – Processes and products – Bacterial
Patent
1993-07-23
1995-02-07
Lander, Ferris
Chemistry: fertilizers
Processes and products
Bacterial
71 10, 71 6, 71903, 435262, 4352625, 210610, 210611, C05F 1108, C02F 300, C05G 300
Patent
active
053872711
ABSTRACT:
Novel methods for biodegrading nitroaromatic compounds present as contaminants in soil or water using microorganisms are disclosed. Water is treatable directly; dry soil is first converted into a fluid medium by addition of water. The preferred method comprises two stages, each employing microorganisms: a fermentative stage, followed by an anaerobic stage. The fermentative stage is rapid, wherein an inoculum of aerobic and/or facultative microorganisms ferments a carbohydrate added to the fluid medium, exhausting the oxygen in the fluid medium and thereby inhibiting oxidative polymerization of amino by-products of the nitroaromatics. In the subsequent anaerobic stage an inoculum of a mixed population of anaerobic microorganisms completes the mineralization of the contaminant nitroaromatics, using the remaining carbohydrate as a carbon and energy source. Preferably, the carbohydrate is a starch and the aerobic and/or facultative microorganisms are amylolytic, which cleave the starch at a moderate rate throughout both stages, ensuring a sustained supply of metabolizable carbohydrate. The microorganisms are preferably selected to be resistant to the types and concentrations of nitroaromatics present as contaminants.
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Crawford Donald L.
Crawford Ronald L.
Stevens Todd O.
Idaho Research Foundation Inc.
Lander Ferris
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