Hydrodynamic disintegration effects assessment by CFD modelling integrated with bench tests DOI Creative Commons
Aleksandra Dzido, Justyna Walczak,

H. Jankowska

et al.

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 367, P. 121948 - 121948

Published: July 31, 2024

The hydrodynamic disintegration process depends, among others, on operational parameters like rotational speed or introduced energy. study presents an interdisciplinary approach to the impact assessment internal processes and effects example of sewage sludge treatment. Three speeds were considered, including fluid properties change at selected stages. Disintegration measured in bench tests. Soluble chemical oxygen demand (SCOD) volatile fatty acids (VFA) before after process. employed degree course methane production biochemical potential (BMP) Fluid during stages does not cause a significant flow structure. Due mathematical modelling results, 1500 rpm no cavitation phenomenon was observed. Although, tests results indicates, for rpm, organic compounds released liquid characterised by higher susceptibility biological decomposition than those 2500 3000 (as suggested low SCOD/VFA values rpm). Obtained have confirmed, that main responsible effect is mechanical shredding cavitation.

Language: Английский

The impact of radicals on physicochemical properties of waste activated sludge during hydrodynamic cavitation treatment DOI Creative Commons
Marko Blagojevič, Mojca Zupanc, Jurij Gostiša

et al.

Ultrasonics Sonochemistry, Journal Year: 2025, Volume and Issue: 115, P. 107291 - 107291

Published: Feb. 25, 2025

Language: Английский

Citations

0
Pretreatment of waste activated sludge by rotational generator of hydraulic shock DOI Creative Commons
Sabina Kolbl Repinc, Gašper Rak, Blaž Stres

et al.

Ultrasonics Sonochemistry, Journal Year: 2025, Volume and Issue: 116, P. 107312 - 107312

Published: March 13, 2025

This study investigates hydrodynamic performance of a novel sludge pretreatment device based on periodic shock wave generation by hydraulic hammer mechanism. A falling circular jet thickened waste activated was repeatedly impacted rotating blade, resulting in occurrence waves within the liquid region adjacent to impact. The rotational generator (RGHS) treating 10 L operated for 30 passes and at two different speeds producing blade impact velocities 44 m/s 70 m/s, respectively. At velocity passes, able achieve 41.3 % disintegration degree (DD), specific energy consumption (SEC) 10.4 kWh/kg sCOD released 9.0 improvement produced methane volume over unprocessed sample. Corresponding values regime were DD = 18.7 %, SEC 8.03 33.1 production. In both regimes, shear-dependent viscosity reduced about 60 while physicochemical analysis, FTIR spectra revealed substantial structural changes WAS, namely median particle size reduction, degradation proteins polysaccharides, microbial cell wall damage, what notable also SEM images. Compared other rotary devices, RGHS can relatively high consuming significantly less solubilization, production enhancement.

Language: Английский

Citations

0
Waste-to-Energy Technologies: Integrating Anaerobic Digestion, Microbial Electrolysis Cells, Hydrodynamic Cavitation, and Electrocoagulation DOI Creative Commons

Kirkland Mahoney,

Stephanie Lansing,

Naresh Kumar Amradi

et al.

Journal of Cleaner Production, Journal Year: 2024, Volume and Issue: 473, P. 143549 - 143549

Published: Sept. 2, 2024

This study explores a novel integration of electro-physicochemical technologies to generate energy and treat water from combined food waste (FW) blackwater (FW-BW), with BW containing activated sludge simulated flush water. The FW-BW substrate was gravity-separated pretreated hydrodynamic cavitation (HDC). Solids gravity separation were used for generation via anaerobic digestion (AD) alone or integrated microbial electrolysis cells (AD-MEC). HDC pretreatment had 51.6% more CH4 production in 5 days (266 mL CH4/g VS) 63% 30 compared AD without HDC. after similar the amount produced over (263 VS). Using MEC increased by 12.7% AD-only. liquids treated electrocoagulation (EC) at 15 V (90 min), which removed 96.2% chemical oxygen demand (COD) 100% total suspended solids. pilot scale design indicates that AD-MEC EC units would 1.4 times than consumed through applying these technologies. These findings demonstration applications four (HDC, AD, MEC, EC) an energy-efficient management approach, producing bioenergy cleaner low-tier use, especially areas lacking traditional treatment options.

Language: Английский

Citations

2
Hydrodynamic disintegration effects assessment by CFD modelling integrated with bench tests DOI Creative Commons
Aleksandra Dzido, Justyna Walczak,

H. Jankowska

et al.

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 367, P. 121948 - 121948

Published: July 31, 2024

The hydrodynamic disintegration process depends, among others, on operational parameters like rotational speed or introduced energy. study presents an interdisciplinary approach to the impact assessment internal processes and effects example of sewage sludge treatment. Three speeds were considered, including fluid properties change at selected stages. Disintegration measured in bench tests. Soluble chemical oxygen demand (SCOD) volatile fatty acids (VFA) before after process. employed degree course methane production biochemical potential (BMP) Fluid during stages does not cause a significant flow structure. Due mathematical modelling results, 1500 rpm no cavitation phenomenon was observed. Although, tests results indicates, for rpm, organic compounds released liquid characterised by higher susceptibility biological decomposition than those 2500 3000 (as suggested low SCOD/VFA values rpm). Obtained have confirmed, that main responsible effect is mechanical shredding cavitation.

Language: Английский

Citations

1