<abstract xmlns="http://www.w3.org/1999/xhtml">Hydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to investigate the effect of hydrodynamic cavitation on disintegration of activated sludge foam and mesophilic fermentation. Cavitation was generated in standard Venturi tube with the diameter ratio <italic>β</italic> = <italic>d</italic>0/<italic>d</italic>1 = 0.30, working at <italic>σ</italic> = 0.249. Detailed Computational Fluid Design (CFD) analysis in class of <italic>k</italic>-<italic>∈</italic> model of internal flow has been presented. Obtained analytical investigation results confirmed the effect of strong disruption of microorganism cells and release of free organic substance into the liquid phase. After a short (30 minutes) pre-treatment, chemical oxygen demand increased by 8.63 times while Müller’s disintegration degree was 50%. Moreover, undertaken mesophilic digestion trials brought significant improvement in biogas production.</abstract>

Hydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to investigate the effect of hydrodynamic cavitation on disintegration of activated sludge foam and mesophilic fermentation. Cavitation was generated in standard Venturi tube with the diameter ratio β = d0/d1 = 0.30, working at σ = 0.249. Detailed Computational Fluid Design (CFD) analysis in class of k-∈ model of internal flow has been presented. Obtained analytical investigation results confirmed the effect of strong disruption of microorganism cells and release of free organic substance into the liquid phase. After a short (30 minutes) pre-treatment, chemical oxygen demand increased by 8.63 times while Müller’s disintegration degree was 50%. Moreover, undertaken mesophilic digestion trials brought significant improvement in biogas production.

Considerations of Impact of Venturi Effect on Mesophilic Digestion

Faculty of Materials, Civil and Environmental Engineering, University of Bielsko-Biala, ul. Willowa 2, 43-300 Bielsko-Biała, Poland

Faculty of Mechanical Engineering and Computer Sciences, University of Bielsko-Biala, ul. Willowa 2, 43-300 Bielsko-Biała, Poland

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Considerations of Impact of Venturi Effect on Mesophilic Digestion"}

Hydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to...

Considerations of Impact of Venturi Effect on Mesophilic Digestion

Publié en ligne: 22 janv. 2016

Pages: 645 - 658

DOI: https://doi.org/10.1515/eces-2015-0039

Mots clés
hydrodynamic cavitation, Venturi effect, activated sludge foam, mesophilic fermentation

© 2015 Alicja Machnicka et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Considerations of Impact of Venturi Effect on Mesophilic Digestion

Publié en ligne: 22 janv. 2016

Pages: 645 - 658

DOI: https://doi.org/10.1515/eces-2015-0039

Mots cléshydrodynamic cavitation, Venturi effect, activated sludge foam, mesophilic fermentation

© 2015 Alicja Machnicka et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
hydrodynamic cavitation, Venturi effect, activated sludge foam, mesophilic fermentation