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Application of (super)cavitation for the recycling of process waters in paper producing industry
Kosel, Janez (Avtor), Šuštaršič, Matej (Avtor), Petkovšek, Martin (Avtor), Zupanc, Mojca (Avtor), Sežun, Mija (Avtor), Dular, Matevž (Avtor)

URLURL - Izvorni URL, za dostop obiščite https://www.sciencedirect.com/science/article/abs/pii/S1350417719313410 Povezava se odpre v novem oknu
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Izvleček
In paper production industry, microbial contaminations of process waters are common and can cause damage to paper products and equipment as well as the occurrence of pathogens in the end products. Chlorine omission has led to the usage of costly reagents and products of lower mechanical quality. In this study, we have tested a rotation generator equipped with two sets of rotor and stator assemblies to generate developed cavitation (unsteady cloud shedding with pressure pulsations) or supercavitation (a steady cavity in chocked cavitation conditions) for the destruction of a persistent bacteria Bacillus subtilis. Our results showed that only supercavitation was effective and was further employed for the treatment of waters isolated from an enclosed water recycle system in a paper producing plant. The water quality was monitored and assessed according to the chemical (COD, redox potential and dissolved oxygen), physical (settleable solids, insolubles and colour intensity) and biological methods (yeasts, aerobic and anaerobic bacteria, bacterial spores and moulds). After one hour of treatment, a strong 4 logs reduction was achieved for the anaerobic sulphate reducing bacteria and for the yeasts; a 3 logs reduction for the aerobic bacteria; and a 1.3 logs reduction for the heat resistant bacterial spores. A 22% reduction in COD and an increase in the redox potential (37%) were observed. Sediments were reduced by 50% and the insoluble particles by 67%. For bacterial destruction in real industrial process waters, the rotation generator of supercavitation spent 4 times less electrical energy in comparison to the previously published cavitation treatments inside the Venturi constriction design. In paper production industry, microbial contaminations of process waters are common and can cause damage to paper products and equipment as well as the occurrence of pathogens in the end products. Chlorine omission has led to the usage of costly reagents and products of lower mechanical quality. In this study, we have tested a rotation generator equipped with two sets of rotor and stator assemblies to generate developed cavitation (unsteady cloud shedding with pressure pulsations) or supercavitation (a steady cavity in chocked cavitation conditions) for the destruction of a persistent bacteria Bacillus subtilis. Our results showed that only supercavitation was effective and was further employed for the treatment of waters isolated from an enclosed water recycle system in a paper producing plant. The water quality was monitored and assessed according to the chemical (COD, redox potential and dissolved oxygen), physical (settleable solids, insolubles and colour intensity) and biological methods (yeasts, aerobic and anaerobic bacteria, bacterial spores and moulds). After one hour of treatment, a strong 4 logs reduction was achieved for the anaerobic sulphate reducing bacteria and for the yeasts; a 3 logs reduction for the aerobic bacteria; and a 1.3 logs reduction for the heat resistant bacterial spores. A 22% reduction in COD and an increase in the redox potential (37%) were observed. Sediments were reduced by 50% and the insoluble particles by 67%. For bacterial destruction in real industrial process waters, the rotation generator of supercavitation spent 4 times less electrical energy in comparison to the previously published cavitation treatments inside the Venturi constriction design.

Jezik:Angleški jezik
Ključne besede:anaerobic sulphate reducing bacteria, Bacillus subtilis, COD, hydrodynamic cavitation, paper mill industry, Redox potential, rotational cavitation generator
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2020
Datum sprejetja članka:03.02.2020
Datum objave članka:01.06.2020
Št. strani:Str. 1-11
Številčenje:Vol. 64, art. 105002
UDK:532.528:676.026(045)
ISSN pri članku:1350-4177
DOI:10.1016/j.ultsonch.2020.105002 Povezava se odpre v novem oknu
COBISS.SI-ID:514117931 Povezava se odpre v novem oknu
Število ogledov:39
Število prenosov:30
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Ultrasonics Sonochemistry
Skrajšan naslov:Ultrason. sonochem.
Založnik:Elsevier
ISSN:1350-4177
COBISS.SI-ID:707668 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:Drugi - Drug financer ali več financerjev
Program financ.:Republic of Slovenia, Ministry of Education, Science and Sport
Številka projekta:OP20.00365
Naslov:Potential of biomass for development of advanced materials and bio-based products
Akronim:(RDI) Cel.Cycle

Financer:EC - European Commission
Program financ.:European Regional Development Fund 2016 – 2020
Številka projekta:OP20.00365
Naslov:Potential of biomass for development of advanced materials and bio-based products
Akronim:(RDI) Cel.Cycle

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P2-0401
Naslov:Energetsko strojništvo

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:01.06.2020

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:rotacijski generator, hidrodinamska kavitacija, stopnja drenaže, Bacillus subtilis, COD, papirna inustrija

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