Considerations of Impact of Venturi Effect on Mesophilic Digestion

Machnicka, A.; Grűbel, Klaudiusz; Mirota, Kryspin

doi:10.1515/eces-2015-0039

Cited by 4 publications

(5 citation statements)

References 19 publications

(16 reference statements)

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“…Hydrodynamic cavitation triggered by the Venturi effect is a promising process for pretreatment of waste activated sludge prior to mesophilic fermentation according to many authors, including Machnicka et al [113]. Furthermore, mesophilic digestion trials have reported a significant increase in the biogas production of approximately 36.1% and 62.16% for 10% and 30% of the volume of foam added to the digestion chamber, respectively.…”

Section: Physical Methodsmentioning

confidence: 99%

Disintegration of Wastewater Activated Sludge (WAS) for Improved Biogas Production

et al. 2018

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Due to rapid urbanization, the number of wastewater treatment plants (WWTP) has increased, and so has the associated waste generated by them. Sustainable management of this waste can lead to the creation of energy-rich biogas via fermentation processes. This review presents recent advances in the anaerobic digestion processes that have led to greater biogas production. Disintegration techniques for enhancing the fermentation of waste activated sludge can be apportioned into biological, physical and chemical means, which are included in this review; they were mainly compared and contrasted in terms of the ensuing biogas yield. It was found that ultrasonic- and microwave-assisted disintegration provides the highest biogas yield (>500%) although they tend to be the most energy demanding processes (>10,000 kJ kg−1 total solids).

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Section: Physical Methodsmentioning

confidence: 99%

Disintegration of Wastewater Activated Sludge (WAS) for Improved Biogas Production

et al. 2018

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“…Thus, the entire productive volume of the reactor is used efficiently. Machnicka et al [53] showed how the addition of cavitationdisintegrated foam to mesophilic anaerobic digestion can improve the process and the production of biogas. The thermophilic digestion mode is more efficient in terms of biogas yield per unit time, but its use can be limited because of economic indicators of the cost of heating the substrate in the bioreactor, and it depends on external temperatures and thus on the climatic zone.…”

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confidence: 99%

Methods for Intensifying Biogas Production from Waste: A Scientometric Review of Cavitation and Electrolysis Treatments

et al. 2022

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This article presents future trends in research using microbiological methods to intensify bioprocesses for biogas production. The pretreatment by combinations of physical and chemical methods, such as cavitation and electrolysis, is considered. The approach of the article involved reviewing the residual area on the intensification technologies of anaerobic digestion with current methods to improve the quality and quantity of biogas. The most valuable reported positive results of the pretreatment of biological raw materials in the cavitation process were reviewed and are presented here. A model of the effect of electrolysis on the species diversity of bacteria in anaerobic digestion was developed, and changes in the dominance of the ecological and trophic systems were revealed on the basis of previous studies. The stimulating effect on biogas yield, reduction in the stabilization period of the reactor, and inactivation of microorganisms at lower temperatures is associated with different pretreatment methods that intensify anaerobic digestion. More research is recommended to focus on the electrolysis treatment of different types of waste and their ratios with optimization of regime parameters, as well as in combination with other pretreatments to produce biomethane and biohydrogen in larger quantities and in better qualities.

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“…One such possibility may be the use of disintegration methods. As we have shown in our earlier works (Grübel and Suschka 2015 ; Machnicka et al 2015 ; Suschka and Grübel 2016 ; Grübel and Machnicka 2020 ; Li et al 2021 ), the disintegration process effectively releases organic matter into the supernatant liquid of WAS, which contributes to the increased production of biogas. In connection with the above, we have undertaken research to determine the effectiveness of disintegration in removing selected bacterial indicators and parasite eggs.…”

Section: Resultsmentioning

confidence: 61%

“…Hydrodynamic disintegration of WAS was done with the use of a pressure pump (12 bar) equipped with a constructed cavitation nozzle (Grübel and Suschka 2015 ; Machnicka et al 2015 ). Pumping 25 l of WAS through the nozzle took 3 min.…”

Section: Methodsmentioning

confidence: 99%

The effect of pre-treatment and anaerobic digestion for pathogens reduction in agricultural utilization of sewage sludge

Machnicka

Grűbel

2022

Environ Sci Pollut Res

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The aim of the research work was to explain the possibilities of application of waste activated sludge (WAS) pretreatment processes prior to anaerobic digestion (mesophilic fermentation). Hydrodynamic disintegration and freezing/thawing disintegration methods were used. Based on the microbiological and parasitological analyses, a significant decrease in pathogenic bacteria, coliphages, and parasite eggs was observed. The number of bacteria analyzed (Salmonella sp., Escherichia coli, Clostridium perfringens) and coliphages were reduced from 19.3to 42.3% after hydrodynamic cavitation. A similar effect was achieved for destruction by freezing/thawing with dry ice between 7.8 and 14.9%. The effectiveness of parasite eggs reduction (Ascaris sp., Trichuris sp., Toxocara sp.) for these disintegration methods ranged from 10.7 to 29.3%. The highest results were observed for the hybrid disintegration method (hydrodynamic cavitation + dry ice disintegration) caused by a synergistic effect. Salmonella sp. in 1 gd.w. decrease about 69.7%, E. coli by 70.0%, Clostridium perfringens by 38.4%, and coliphages by 48.2%. Disruption of WAS by a hybrid method led to a reduction in the number of helminth eggs Ascaris sp. (63.8%), Trichuris sp. (64.3%), and Toxocara sp. (66.4%). After anaerobic digestion under mesophilic conditions, an additional reduction of analyzed bacterial pathogens and helminth eggs were observed. The introduction of hybrid disintegrated WAS to the fermentation chamber resulted in higher efficiency in decrease (from 1 to 23%) in comparison to the control sample (70%WAS + 30%DS (inoculum-digested sludge)).

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Considerations of Impact of Venturi Effect on Mesophilic Digestion

Cited by 4 publications

References 19 publications

Disintegration of Wastewater Activated Sludge (WAS) for Improved Biogas Production

Disintegration of Wastewater Activated Sludge (WAS) for Improved Biogas Production

Methods for Intensifying Biogas Production from Waste: A Scientometric Review of Cavitation and Electrolysis Treatments

The effect of pre-treatment and anaerobic digestion for pathogens reduction in agricultural utilization of sewage sludge

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