Fixed-bed fermentation of rice straw and chicken manure using a mixed culture of marine mesophilic microorganisms.
A mixture of rice straw (80%) and chicken manure (20%) was pretreated and fermented to carboxylic acids by using a mixed culture of marine mesophilic microorganisms. Two sets of four fermentors, built from PVC pipes, were used for both biomass pretreatment and fermentation. Four 1L fermentors (F1-F4) were arranged in series, where liquid fermentation products were transferred from one fermentor to the other, to form a train. A liquid volume of 10mL and 15mL were transferred every four days for Trains A and B, respectively. The maximum total acid concentration for F1 in Train A was 34.2g/L and the maximum acid concentration in F2-F4 was approximately 44g/L. The maximum total acid concentration in F1 in Train B was 30.5g/L and the maximum acid concentration in F2-F4 was approximately 48g/L. The conversion in each of the fermentors in Train A varied from 0.821 to 0.879g VS digested/g VS fed and the yield was in the range 0.489-0.609g total acids/g VS fed. The conversion and yield in Train B were 0.741-0.914g VS digested/g VS fed and 0.563-0.669g total acids/g VS fed, respectively. The continuum particle distribution model (CPDM) predicted acid concentrations and retention times in the fixed-bed fermentation system with R(2) of 0.67-0.84 in Trains A and B.
Agbogbo
Frank K
FK
Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, United States.
Holtzapple
Mark T
MT
D000818:Animals; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002245:Carbon Dioxide / Q000032:analysis; D002645:Chickens; D005285:Fermentation; D008372:Manure / Q000032:analysis* / Q000382:microbiology; D008697:Methane / Q000032:analysis; D008962:Models, Theoretical; D012275:Oryza / Q000378:metabolism*; D018547:Plant Stems / Q000378:metabolism*
D008372:Manure; D002245:Carbon Dioxide; D008697:Methane