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Aerobic nitrogen fixation during the biodegradation of lignocellulosic wastes
AbstractThe detailed analysis of the changes in pH, CO2 production, water content and organic matter decomposition showed the occurrence of an alternate succession of intense microbiological activity stages and stationary periods during the aerobic degradation of various lignocellulosic wastes (poplar sawdust, wheat straw and sawdust-straw mixture) in reactors at room temperature over several months. The total nitrogen content followed the same general pattern of change. Dinitrogen fixation occurred during short periods when low molecular weight carbon compounds released through lignocellulose hydrolysis were available to N2-fixers under conditions of severe mineral nitrogen deficiency. The overall nitrogen enrichment could reach values of 8 g kg−1 initial dry matter. The action of the various successive microbial (saprophytic and N2-fixing) populations was both complementary and competitive. Asymbiotic nitrogen fixation was promoted by pH values close to neutrality and irreversibly inhibited by acidity. An initial input of urea speeded up sawdust decay and promoted N2 fixation later on. Substrate-enrichment in molybdenum enhanced N2 fixation: the yield, expressed as mg fixed N2 per g CO2 evolved, reached its highest values (60% of the maximum theoretical yield) at low Mo concentrations (20 ppm) whereas toxic doses were particularly high (2000 ppm).
Aerobic nitrogen fixation during the biodegradation of lignocellulosic wastes
AbstractThe detailed analysis of the changes in pH, CO2 production, water content and organic matter decomposition showed the occurrence of an alternate succession of intense microbiological activity stages and stationary periods during the aerobic degradation of various lignocellulosic wastes (poplar sawdust, wheat straw and sawdust-straw mixture) in reactors at room temperature over several months. The total nitrogen content followed the same general pattern of change. Dinitrogen fixation occurred during short periods when low molecular weight carbon compounds released through lignocellulose hydrolysis were available to N2-fixers under conditions of severe mineral nitrogen deficiency. The overall nitrogen enrichment could reach values of 8 g kg−1 initial dry matter. The action of the various successive microbial (saprophytic and N2-fixing) populations was both complementary and competitive. Asymbiotic nitrogen fixation was promoted by pH values close to neutrality and irreversibly inhibited by acidity. An initial input of urea speeded up sawdust decay and promoted N2 fixation later on. Substrate-enrichment in molybdenum enhanced N2 fixation: the yield, expressed as mg fixed N2 per g CO2 evolved, reached its highest values (60% of the maximum theoretical yield) at low Mo concentrations (20 ppm) whereas toxic doses were particularly high (2000 ppm).
Aerobic nitrogen fixation during the biodegradation of lignocellulosic wastes
Nuntagij, Achara (author) / de Lassus, Charles (author) / Sayag, Daniel (author) / André, Louis (author)
Biological Wastes ; 29 ; 43-61
1988-11-08
19 pages
Article (Journal)
Electronic Resource
English
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