20.500.12556/RUL-133321 Integral analysis of hydrodynamic cavitation effects on waste activated sludge characteristics, potentially toxic metals, microorganisms and identification of microplastics 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. hydrodynamic cavitation waste activated sludge sludge characteristics microbial damage potentially toxic metals microplastics hidrodinamska kavitacija odpadno blato lastnosti blata poškodbe mikroorganizmov potencialno nevarne kovine mikroplastika true false true Angleški jezik Slovenski jezik Članek v reviji 2021-11-22 13:10:02 2021-11-22 13:10:13 2022-09-12 04:15:46 0000-00-00 00:00:00 2022 0 0 14 str. pt. 4, art. 151414 Vol. 806 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.528:628.355 0048-9697 10.1016/j.scitotenv.2021.151414 83741955 RAZ_Kolbl_Repinc_Sabina_0.pdf RAZ_Kolbl_Repinc_Sabina_0.pdf 1 04B23D140748C4A9B1AFAD15D1DB3D1F 89660b6dd074fc00c8dee1bfed1f90bba47dd9823229e3e211833571c83e1ef6 abcb80f4-540a-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151742 https://www.sciencedirect.com/science/article/pii/S0048969721064925 0 11eff2e5-4b8d-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151305 Fakulteta za gradbeništvo in geodezijo Fakulteta za strojništvo Biotehniška fakulteta 0 0 0