20.500.12556/RUL-113727 Cavitation as a potential technology for wastewater management an example of enhanced nutrient release from secondary pulp and paper mill sludge Kavitacija kot potencialna tehnologija za revitalizacijo odpadnih voda: primer povečanega sproščanja hranil iz odpadnega biološkega mulja papirne industrije Wastewater recycling and sludge removal in the paper industry account for about 60 % of all process costs. New and environmentally friendly wastewater treatment techniques are, therefore, continually being developed. Cavitation exploitation is currently a well-investigated topic that is also interesting for the paper production industry. This study investigates efficiency of hydrodynamic cavitation alone and in combination with the addition of NaOH for the treatment of secondary pulp and paper mill sludge in order to enhance nutrient release. First, two laboratory-scale devices were tested: the blow-through and the rotating hydrodynamic cavitation generator. The latter set-up proved to be more efficient: therefore, further experiments were performed on its pilot-scale version. The results showed an increase of soluble chemical oxygen demand (CODs) by 514 mg/L, total nitrogen (Nt) by 17.4 mg/L, and total phosphorous (Pt) by 2.3 mg/L. To further increase nutrient release combination of cavitation and sludge sample alkalinization was tested. The addition of NaOH and 30 min cavitation of secondary sludge (500 L) significantly improved CODs and Nt release by 2400 mg/L and 120 mg/L, respectively. Microbiological photos revealed a definite disintegration of sludge flocks. According to our estimates, 1.9 kg of released CODs from alkaline pre-treated and cavitated sludge would cost only one euro. hydrodynamic cavitation nutrients paper mill plants secondary sludge hidrodinamska kavitacija hranila papirna industrija odpadni biološki mulj razgradnja muljev obdelala odpadnih voda true false true Angleški jezik Slovenski jezik Članek v reviji 2020-01-29 13:52:30 2020-01-29 13:52:34 2022-08-26 03:47:12 0000-00-00 00:00:00 2019 0 0 Str. 641-649 no. 11/12 Vol. 65 Nov./Dec. 2019 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.528(045) 0039-2480 10.5545/sv-jme.2019.6328 16942363 762116 RAZ_Sezun_Mija_2019.pdf RAZ_Sezun_Mija_2019.pdf 1 54D20CD327321AFF32F9610398B909E5 046b9eedadd6dc4540a92d9b3e8e631eeae41f5229a0607337f81a64a25150c1 2564d556-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=125826 https://www.sv-jme.eu/sl/article/cavitation-as-a-potential-technology-for-wastewater-management-an-example-of-enhanced-nutrient-release-from-secondary-pulp-and-paper-mill-sludge/ 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=125825 Fakulteta za strojništvo 0 0 0