Integral analysis of hydrodynamic cavitation effects on waste activated sludge characteristics, potentially toxic metals, microorganisms and identification of microplastics

Kolbl Repinc, Sabina (avtor), Bizjan, Benjamin (avtor), Budhiraja, Vaibhav (avtor), Dular, Matevž (avtor), Gostiša, Jurij (avtor), Brajer Humar, Barbara (avtor), Kaurin, Anela (avtor), Kržan, Andrej (avtor), Levstek, Marjetka (avtor), Morales Arteaga, Juan Francisco (avtor), Petkovšek, Martin (avtor), Rak, Gašper (avtor), Stres, Blaž (avtor), Širok, Brane (avtor), Žagar, Ema (avtor), Zupanc, Mojca (avtor)

Wastewater treatment plants, the last barrier between ever-increasing human activities and the environment, produce huge amounts, of unwanted semi-solid by-product - waste activated sludge. Anaerobic digestion can be used to reduce the amount of sludge. However, the process needs extensive modernisation and refinement to realize its full potential. This can be achieved by using efficient pre-treatment processes that result in high sludge disintegration and solubilization. To this end, we investigated the efficiency of a novel pinned disc rotational generator of hydrodynamic cavitation. The results of physical and chemical evaluation showed a reduction in mean particle size up to 88%, an increase in specific surface area up to 300% and an increase in soluble COD, NH$_4$-N, NO$_3$-N, PO$_4$-P up to 155.8, 126.3, 250 and 29.7%, respectively. Microscopic images confirmed flocs disruption and damage to yeast cells and Epistilys species due to mechanical effects of cavitation such as microjets and shear forces. The observed cell ruptures and cracks were sufficient for the release of small soluble biologically relevant dissolved organic molecules into the bulk liquid, but not for the release of microbial DNA. Cavitation treatment also decreased total Pb concentrations by 70%, which was attributed to the reactions triggered by the chemical effects of cavitation. Additionally, the study confirmed the presence of microplastic particles and fibers of polyethylene, polyethylene terephthalate, polypropylene, and nylon 6 in the waste activated sludge.

• Jezik: Angleški jezik
• Ključne besede: hydrodynamic cavitation, waste activated sludge, sludge characteristics, microbial damage, potentially toxic metals, microplastics
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo ; FS - Fakulteta za strojništvo ; BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 14 str.
• Številčenje: Vol. 806, pt. 4, art. 151414
• PID: 20.500.12556/RUL-133321
• UDK: 532.528:628.355
• ISSN pri članku: 0048-9697
• DOI: 10.1016/j.scitotenv.2021.151414
• COBISS.SI-ID: 83741955
• Datum objave v RUL: 22.11.2021

Gradivo je del revije

• Naslov: Science of the total environment
• Skrajšan naslov: Sci. total environ.
• Založnik: Elsevier
• ISSN: 0048-9697
• COBISS.SI-ID: 26369024

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: hidrodinamska kavitacija, odpadno blato, lastnosti blata, poškodbe mikroorganizmov, potencialno nevarne kovine, mikroplastika