A novel rotation generator of hydrodynamic cavitation for waste-activated sludge disintegration

•A novel rotation generator of hydrodynamic cavitation is presented.•Experimental measurements on a pilot-scale bioreactor plant.•Generated cavitation has a very strong impact on the disintegration of the waste-activated sludge.•Presented cavitation generator has a considerable effect on the biogas...

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Published in:Ultrasonics sonochemistry 2015-09, Vol.26, p.408-414
Main Authors: Petkovšek, Martin, Mlakar, Matej, Levstek, Marjetka, Stražar, Marjeta, Širok, Brane, Dular, Matevž
Format: Article
Language:English
Subjects:
Biogas production
Disintegration
Feasibility Studies
Hydrodynamic cavitation
Hydrodynamics
Rotation
Sewage - chemistry
Waste Disposal, Fluid - economics
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Waste-activated sludge
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Summary:•A novel rotation generator of hydrodynamic cavitation is presented.•Experimental measurements on a pilot-scale bioreactor plant.•Generated cavitation has a very strong impact on the disintegration of the waste-activated sludge.•Presented cavitation generator has a considerable effect on the biogas production increase. The disintegration of raw sludge is very important for enhancement of the biogas production in anaerobic digestion process as it provides easily degradable substrate for microorganisms to perform maximum sludge treatment efficiency and stable digestion of sludge at lower costs. In the present study the disintegration was studied by using a novel rotation generator of hydrodynamic cavitation (RGHC). At the first stage the analysis of hydrodynamics of the RGHC were made with tap water, where the cavitation extent and aggressiveness was evaluated. At the second stage RGHC was used as a tool for pretreatment of a waste-activated sludge (WAS), collected from wastewater treatment plant (WWTP). In case of WAS the disintegration rate was measured, where the soluble chemical oxygen demand (SCOD) and soluble Kjeldahl nitrogen were monitored and microbiological pictures were taken. The SCOD increased from initial 45mg/L up to 602mg/L and 12.7% more biogas has been produced by 20 passes through RGHC. The results were obtained on a pilot bioreactor plant, volume of 400L.
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2015.01.006