Aerobic biodegradation of wheat stillage (distillery wastewater) at an elevated temperature—Effect of solids separation
Małgorzata Krzywonos , Edmund Cibis , Agnieszka Ryznar-Luty , Tadeusz Miśkiewicz , Daniel Borowiak
AbstractThe aim of the study was to determine how the separation of solids affects the course and efficiency of the batch process of wheat stillage (distillery wastewater) biodegradation using meso- and thermophilic bacteria of the genus Bacillus. The processes with and without solids separation were conducted for 144 h in a 5-L bioreactor, with aeration at 1.6 vvm, stirrer revolutions of 550/min, at a constant pH (pH = 6.5) and the temperature of 45 °C. The results have shown that the separation of solids is superfluous, because it had only a minor effect on the reduction in the chemical oxygen demand determined in the substrate upon solids separation (SCOD). The extent of SCOD reduction amounted to 88.25% for non-filtered and 92.85% for filtered stillage. Moreover, during biodegradation of the non-filtered stillage the bacterial consortium was able per se to remove more than 50% of the suspended solids present in the stillage in the amount of approx. 50 g/L (the biomass produced being neglected).
|Journal series||Biochemical Engineering Journal, ISSN 1369-703X, (A 35 pkt)|
|Publication size in sheets||0.4|
|Keywords in English||Aerobic digestion; Bacillus; Distillery; Stirred-tank reactor; Waste treatment; Wheat stillage|
|ASJC Classification||; ; ;|
|Publication indicators||= 8; : 2014 = 1.226; : 2010 = 2.692 (2) - 2010=2.807 (5); = 8|
|Citation count*||11 (2020-01-25)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.