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undergraduate thesis
Obrada aktivnog mulja ultrazvukom
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2012. urn:nbn:hr:159:820383
Hviezd, Katarina
University of Zagreb
Faculty of Food Technology and Biotechnology
Department of Process Engineering
Laboratory for Unit Operations

Institutional repository: Repository of the Faculty of Food Technology and Biotechnology

Cite this document

Hviezd, K. (2012). Obrada aktivnog mulja ultrazvukom (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:820383

Hviezd, Katarina. "Obrada aktivnog mulja ultrazvukom." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2012. https://urn.nsk.hr/urn:nbn:hr:159:820383

Hviezd, Katarina. "Obrada aktivnog mulja ultrazvukom." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2012. https://urn.nsk.hr/urn:nbn:hr:159:820383

Hviezd, K. (2012). 'Obrada aktivnog mulja ultrazvukom', Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 04 January 2025, https://urn.nsk.hr/urn:nbn:hr:159:820383

Hviezd K. Obrada aktivnog mulja ultrazvukom [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2012 [cited 2025 January 04] Available at: https://urn.nsk.hr/urn:nbn:hr:159:820383

K. Hviezd, "Obrada aktivnog mulja ultrazvukom", Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2012. Available at: https://urn.nsk.hr/urn:nbn:hr:159:820383

Metadata
TitleObrada aktivnog mulja ultrazvukom
Title (english)Solubilisation of waste-activated sludge by ultrasonic treatment
AuthorKatarina Hviezd
MentorMladen Brnčić (mentor)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
(Department of Process Engineering)
(Laboratory for Unit Operations)
Zagreb
Defense date and country2012-07-25, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Biotechnology
Abstract
S ciljem povećanja učinkovitosti anaerobne razgradnje, proučeno je djelovanje ultrazvuka na aktivni mulj. Cilj ovog rada bio je proučiti kako primjena ultrazvuka visokih intenziteta i različitih amplituda utječe na obradu aktivnog mulja. Koristio se ultrazvučni uređaj maksimalne nominalne snage 400 W i frekvencije 24 kHz. Uzorci aktivnog mulja bili su podvrgnuti ultrazvučnim valovima 5, 15 i 25 minuta. Obrada se provodila ultrazvukom amplitude 60% i 90%. Nakon obrade, udio otopljenih organskih tvari mjeren kao kemijska potrošnja kisika (KPK), porastao je (38,4%), uz istovremeno smanjenje udjela suspendiranih organskih tvari (37,55%). Upotrebom veće amplitude dobiveni su bolji rezultati obrade. Veličina čestica u suspenziji smanjila se nakon primjene ultrazvuka. U smislu biorazgradnje, primjena ultrazvuka doprinijela je udjelu topivih tvari zbog čega bi proizvodnja bioplina digestijom mulja trebala biti uspješnija.
Abstract (english)
In order to enhance the efficiency of anaerobic digestion, the effects of ultrasonic treatment have been studied on waste–activated aludge. The aim of this work was to investigate the impact of hi–intensity ultrasound and different amplitudes on solubilisation of waste-activated sludge. Ultrasound device working at frequency of 24 kHz with a power capacity about 400 W was used for ultrasound treatment. Samples of sludge were exposed for 5, 15 and 25 minutes to the ultrasound waves. The amplitudes used were 60% and 90%. After treatment, volume of dissolved organic matter was measured as chemical oxygen demand (COD), it increased (38,4%), simultaneously volume of suspended organic matter decreased (37,55%). Use of a larger amplitudes obtained better results processing. Particle size in suspension decreased after the ultrasound treatment. In terms of biodegrability, the use of ultrasound contributed to the soluble part of sludge what leads to the more successfull production of biogas by digestion.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:159:820383
Study programmeTitle: Biotechnology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2017-05-16 10:33:15