Utjecaj aeracije pri povišenom tlaku na biološku obradu otpane vode

doctoral thesis

• Title (english): The influence of pressurized aeration on biological wastewater treatment
• Author: Vlado Crnek
• Mentor: Josip Ćurko (mentor)
• Committee member: Tibela Landeka Dragičević (predsjednik povjerenstva)
• Committee member: Dijana Grgas (član povjerenstva)
• Committee member: Marija Vuković Domanovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for Water Technology); Zagreb
• Defense date and country: 2024, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology
• Universal decimal classification (UDC): 628 - Public health engineering. Water. Sanitation. Illuminating engineering

Abstract

Veliki utjecaj u biološkoj obradi otpadnih voda je aeracija suspenzije otpadne vode i aktivnog mulja u reaktorima, odnosno, učinkovitost prijenosa kisika iz plinovite faze u suspenziju. Konvencionalni sustavi aeracije suspenzije aktivnog mulja i otpadne vode, u reaktorima s difuzorima koji raspršuju zrak u fine mjehuriće, pokazuju relativno neučinkovit prijenos kisika iz plinovite faze u suspenziju aktivnog mulja jer se većina dobavljenog kisika ne otopi nego odlazi neiskorišten u atmosferu. Stoga je sustav aeracije pod tlakom (engl. Supersaturated Dissolved Oxigen, SDOX) predložen kao alternativa za opskrbu otopljenim kisikom. Cilj ovog rada je istražiti kako aeracija pri povišenom tlaku utječe na proces uklanjanja dušika iz otpadnih voda kroz procese nitrifikacije i denitrifikacije, na napredno biološko uklanjanje fosfora iz otpadnih voda (EBPR), na čepljenje uronjivih membrana u membranskom bioreaktoru (MBR), na taloživost aktivnog mulja i veličinu čestica aktivnog mulja. Istraživanje će doprinijeti boljem razumijevanju utjecaja aeracije pri povišenom tlaku na biološku aktivnost aktivnog mulja u obradi otpadnih voda, na efikasnost odvajanja aktivnog mulja od obrađene vode taloženjem u taložnicama, kao i bolji uvid u probleme začepljivanja membrana u MBR-u.

Abstract (english)

A major influence in the biological treatment of wastewater is the aeration of the suspension of wastewater and activated sludge in reactors, that is, the efficiency of oxygen transfer from the gaseous phase to the suspension. Conventional systems of aeration of activated sludge suspension and wastewater, in reactors with diffusers that disperse air into fine bubbles, show a relatively inefficient transfer of oxygen from the gaseous phase to the activated sludge suspension because most of the supplied oxygen does not dissolve but goes unused into the atmosphere. Therefore, the pressurized aeration system (Supersaturated Dissolved Oxygen, SDOX) is proposed as an alternative for supplying dissolved oxygen. The aim of this work is to investigate how aeration at elevated pressure affects the process of removing nitrogen from wastewater through the processes of nitrification and denitrification, advanced biological removal of phosphorus from wastewater (EBPR), clogging of submersible membranes in a membrane bioreactor (MBR), sedimentation of active sludge and activated sludge particle size. The research will contribute to a better understanding of the impact of aeration at elevated pressure on the biological activity of activated sludge in wastewater treatment, on the efficiency of separating activated sludge from treated water by sedimentation in settling tanks, as well as a better insight into the problems of membrane clogging in MBR.

• Keywords: Otpadna voda; aeracija; SDOX; MBR; SBR; EBPR; membrane
• Keywords (english): Waste water; aeration; SDOX; MBR; SBR; EBPR; membrane
• Language: croatian
• URN:NBN: urn:nbn:hr:159:266622
• Promotion: 2024
• Study programme: Title: Biotechnology & Bioprocess Engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor znanosti/doktorica znanosti (doktor znanosti/doktorica znanosti)
• Type of resource: Text
• Extent: 139 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-06-05 10:19:15