||Effect of Presynthesized Biological Intermediates on Substrate Utilization Rates.
Nova, John T. ;
||Missouri Water Resources Research Center, Columbia.
||DI-14-31-0001-3225; OWRR-A-039-MO; 01336,; A-039-MO(1)
( Waste treatment ;
Microorganism control(Sewage)) ;
Anaerobic bacteria ;
Fatty acids ;
Acetic acid ;
Biological waste treatment systems
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The design of biological waste treatment systems is frequently based upon the microbial rate of degradation of pure organic substrates. In the case of anaerobic digesters, these rates are frequently obtained by measuring the degradation rate of short chain fatty acids. In the study anaerobic methane bacteria were fed acetic acid in the presence of other biological growth intermediates. In almost all instances the acetic acid degradation rate was greater in the presence of extraneous substrates and greatest in the presence of lysed microorganisms. It was concluded that microbial kinetic values obtained for pure substrates are not applicable to mixed substrate systems and microbial growth rates can be enhanced by recirculation of lysed microorganisms or by feeding a more concentrated mixed substrate. (Author)