Uklanjanje dušika iz otpadne vode primjenom granuliranoga aktivoga mulja

doctoral thesis

• Title (english): Nitrogen removal from wastewater using granulated activated sludge
• Author: Mirjana Galant
• Mentor: Tibela Landeka Dragičević (mentor)
• Committee member: Dijana Grgas (predsjednik povjerenstva)
• Committee member: Božidar Šantek (član povjerenstva)
• Committee member: Mirna Habuda-Stanić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for the Biological Waste Water Treatment); Zagreb
• Defense date and country: 2023, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology
• Universal decimal classification (UDC): 577 - Biochemistry. Molecular biology. Biophysics

Abstract

Aerobni granulirani mulj formiran je iz aktivnog mulja u SBR reaktoru, uz acetat kao izvor ugljika. Povećanje omjera KPK/N povoljno djeluje na uklanjanje N, P i KPK. Učinkovitost uklanjanja N s povećanjem omjera KPK/N od 1 do 23 se povećala od 40% do 80%, kao i uklanjanje KPK od 57% do 96%. S povećanjem omjera KPK/N do vrijednosti omjera KPK/N 17 zabilježen je trend povećanja učinkovitosti uklanjanja P te je pri omjeru KPK/N 17 određena najveća učinkovitost uklanjanja P od 69,3%, a daljnjim povećanjem omjera KPK/N učinkovitost uklanjanja P se smanjivala. S porastom protoka zraka postiže se veća koncentracija otopljenog kisika, raste učinkovitost uklanjanja KPK, međutim, učinkovitost uklanjanja N i P raste s povećanjem koncentracije otopljenog kisika do 2 mg/L dok se daljnjim povećanjem koncentracije otopljenog kisika učinkovitost uklanjanja N i P snižava. Rezultati pokazuju trend smanjenja promjera granule s povećanjem protoka zraka. Primjenom FISH metode u aerobnom granuliranom mulju dokazani su mikrobni klasteri odgovorni za procese nitritacije, nitratacije, denitrifikacije, uklanjanja fosfora (PAOs), anoksično uklanjanje fosfora uz NO₂-N i NO₃-N kao akceptore elektrona (DPAOs), i pohranjivanje glikogena (GAOs).

Abstract (english)

Aerobic granular sludge was formed from activated sludge in an SBR reactor, with acetate as a carbon source. Increasing the COD/N ratio has a favorable effect on N, P and COD removal. N removal efficiency with increasing COD/N ratio from 1 to 23 increased from 40% to 80%, as well as COD reduction form 57% to 96%. With the increase of the COD/N ratio to the COD/N 17, a trend of increasing P removal efficiency was recorded, and at the COD/N ratio of 17, the highest P removal efficiency of 69.3% was determined, and with a further increase in the COD/N ratio, the P removal efficiency was reduced. With an increase in air flow, a higher dissolved oxygen concentration is achieved, COD removal efficiency increases, however, the N and P removal efficiency increases with an increase in the dissolved oxygen concentration up to 2 mg/L, while a further increase in the dissolved oxygen concentration decreases the N and P removal efficiency. The results show a trend of decreasing granule diameter with increasing air flow. Using the FISH method in aerobic granular sludge, microbial clusters responsible for nitritation, nitration, denitrification, phosphorus removal (PAOs), anoxic phosphorus removal with NO₂-N and NO₃-N as electron acceptors (DPAOs), and glycogen storage (GAOs) were proven.

• Keywords: aerobni granulirani mulj; uklanjanje dušika; stabilnost; aktivnost
• Keywords (english): aerobic granulated sludge; N removal; AGS stability
• Language: croatian
• URN:NBN: urn:nbn:hr:159:366691
• Promotion: 2023
• Study programme: Title: Postgraduate PhD Study in Nutrition; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje biotehničkih znanosti, polje nutricionizam (doktor/doktorica znanosti, područje biotehničkih znanosti, polje nutricionizam)
• Type of resource: Text
• Extent: 163 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-08-03 08:07:43