Fermentation of rice straw/chicken manure to carboxylic acids using a mixed culture of marine mesophilic micoorganisms.
Countercurrent fermentation of rice straw and chicken manure to carboxylic acids was performed using a mixed culture of marine mesophilic microorganisms. To increase the digestibility of the biomass, rice straw, and chicken manure were pretreated with 0.1 g Ca(OH)2/g biomass. Fermentation was performed for 80% rice straw and 20% chicken manure at various volatile solid loading rates (VSLR) and liquid residence times (LRT). The highest acid productivity of 1.69 g/(L x d) occurred at a total acid concentration of 32.4 g/L. The highest conversion (0.69 g VS digested/g VS fed) and yield (0.29 g total acids/g VS fed) were at a total acid concentration of 25 g/L. A Continuum Particle Distribution Model of the process predicted the experimental total acid concentration and conversion results with an average error of 6.41% and 6.15%, respectively. Results show how total acid concentrations, conversions, and yields vary with VSLR and LRT in the MixAlco process.
Agbogbo
Frank K
FK
Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA.
Holtzapple
Mark T
MT
D000818:Animals; D002264:Carboxylic Acids / Q000378:metabolism*; D002645:Chickens; D018920:Coculture Techniques / Q000379:methods*; D005285:Fermentation; D008372:Manure / Q000382:microbiology*; D012275:Oryza / Q000382:microbiology*; D035261:Plant Components, Aerial / Q000382:microbiology*; D012623:Seawater / Q000382:microbiology*; D014871:Water Microbiology
D002264:Carboxylic Acids; D008372:Manure