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

Povzetek

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, NH4-N, NO3-N, PO4-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.

Ključne besede

hydrodynamic cavitation;waste activated sludge;sludge characteristics;microbial damage;potentially toxic metals;microplastics;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 532.528:628.355
COBISS: 83741955 Povezava se bo odprla v novem oknu
ISSN: 0048-9697
Št. ogledov: 233
Št. prenosov: 89
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: hidrodinamska kavitacija;odpadno blato;lastnosti blata;poškodbe mikroorganizmov;potencialno nevarne kovine;mikroplastika;
Vrsta dela (COBISS): Članek v reviji
Strani: str. 1-14
Letnik: ǂVol. ǂ806
Zvezek: ǂpt. ǂ4
Čas izdaje: Feb. 2022
DOI: 10.1016/j.scitotenv.2021.151414
ID: 14083824