Monsanto Company

M Joan Brackin

Daniel Eric Steinmeyer

Michael A Heitkamp

A method for treatment of a liquid waste stream having an undesirably high COD and comprising water and a concentration of organic nitrogen compounds of at least about 300 mg/l total kjedahl nitrogen is disclosed. According to the method, the liquid waste stream is oxygenated to produce an oxygenated liquid containing water, dissolved oxygen and the organic nitrogen compounds and the oxygenated liquid is passed through a fluidized bed reactor containing a fluidized bed of particulate solids supporting microorganisms capable of biodegrading the organic nitrogen compounds, thereby to subject the organic nitrogen compounds in the oxygenated liquid to aerobic microbial degradation and to produce an effluent containing water, ammonia and carbon dioxide, and the fluidized bed reactor contents and the effluent is maintained at a pH in the range of from about 6 to about 8.

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Maryland Heights, MO, United States of America

M Joan Brackin