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


The 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).
Author Małgorzata Krzywonos (EaE / IChaFT / DBE)
Małgorzata Krzywonos,,
- Department of Bioprocessing Engineering
, Edmund Cibis (EaE / IChaFT / DBE)
Edmund Cibis,,
- Department of Bioprocessing Engineering
, Agnieszka Ryznar-Luty (EaE / IChaFT / DBE)
Agnieszka Ryznar-Luty,,
- Department of Bioprocessing Engineering
, Tadeusz Miśkiewicz (EaE / IChaFT / DBE)
Tadeusz Miśkiewicz,,
- Department of Bioprocessing Engineering
, Daniel Borowiak (EaE / IChaFT / DBE)
Daniel Borowiak,,
- Department of Bioprocessing Engineering
Journal seriesBiochemical Engineering Journal, ISSN 1369-703X, (A 35 pkt)
Issue year2010
Publication size in sheets0.4
Keywords in EnglishAerobic digestion; Bacillus; Distillery; Stirred-tank reactor; Waste treatment; Wheat stillage
ASJC Classification2204 Biomedical Engineering; 2305 Environmental Engineering; 1502 Bioengineering; 1305 Biotechnology
Languageen angielski
Aerobic_biodegradation_of_wheat_stillage_2010.pdf 431,63 KB
Score (nominal)35
Publication indicators WoS Citations = 8; Scopus SNIP (Source Normalised Impact per Paper): 2014 = 1.226; WoS Impact Factor: 2010 = 2.692 (2) - 2010=2.807 (5); Scopus Citations = 8
Citation count*11 (2020-08-09)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.