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Characterization of Bacterial Biofilms for Wastewater Treatment
KTH, Skolan för bioteknologi (BIO), Miljömikrobiologi. (Miljömikrobiologi)
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Research performed at the Division of Environmental Microbiology has over the last years resulted in the isolation of possible bacterial key-organisms with efficient nutrient removal properties (Comamonas denitrificans, Brachymonas denitrificans, Aeromonas hydrophila). Effective use of these organisms for enhanced nutrient removal in wastewater treatment applications requires the strains to be retained, to proliferate and to maintain biological activity within theprocess. This can be achieved by immobilization of the organisms using an appropriate system.Two putative immobilization systems, agar entrapment and biofilm formation, wereassessed. Surface attached biofilm growth provided better results with respect to cell retention,proliferation and microbial activity than immobilization in agar beads. Thus, biofilm physiology was further characterized using simplified systems of single, dual or multi strain bacterial consortia containing the key-organisms as well as other wastewater treatment isolates. Mechanisms for initial adherence, biofilm formation over time, dynamics and characteristics of extracellular polymeric substances (EPS) and exopolysaccharides, nutrient removal activity as well as the effect of bacterial interactions were investigated. The results showed that all theassessed bacterial strains could form single strain biofilm providing that a suitable nutrientsupply was given. Production of EPS was found to be critical for biofilm development and both EPS and polysaccharide residue composition varied with bacterial strain, culture conditions and biofilm age. Denitrification and phosphorus removal activity of the keyorganisms was maintained in biofilm growth. Co-culturing of two or more strains resulted in both synergistic and antagonistic effects on biofilm formation as well as the microbial activitywithin the biofilm. Bacterial interactions also induced the synthesis of new polysaccharideswhich were not produced in pure strain biofilms.The complexity of single and mixed strain biofilm development and the implications of interactions on biofilm performance were underlined in this study. The data presented can be useful for modeling of biofilm systems, serve as a tool for selection of bacterial strain combinations to use for bioaugmentation/bioremediation or provide a base for further experiment design.

Ort, förlag, år, upplaga, sidor
Stockholm: Kungliga Tekniska Högskolan , 2009. , s. viii, 63
Serie
Trita-BIO-Report, ISSN 1654-2312
Nyckelord [en]
biofilm, extracellular polymeric substances, exopolysaccharides, interspecies interactions, wastewater treatment, denitrification, phosphorus removal
Nationell ämneskategori
Mikrobiologi
Identifikatorer
URN: urn:nbn:se:kth:diva-10118ISBN: 978-91-7415-255-5 (tryckt)OAI: oai:DiVA.org:kth-10118DiVA, id: diva2:209486
Disputation
2009-04-17, Hörsal K1, KTH, Teknikringen 56, Stockholm, 10:00 (Svenska)
Opponent
Handledare
Anmärkning
QC 20100622Tillgänglig från: 2009-03-25 Skapad: 2009-03-23 Senast uppdaterad: 2010-07-19Bibliografiskt granskad
Delarbeten
1. Bioaugmentation for enhanced denitrification in a labscale treatment system
Öppna denna publikation i ny flik eller fönster >>Bioaugmentation for enhanced denitrification in a labscale treatment system
2006 (Engelska)Ingår i: Proceedings of the Second IASTED International Conference on Advanced Technology in the Environmental Field / [ed] Ubertini, L, ACTA Press, 2006, s. 63-67Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The effect of bioaugmentation was investigated in a predenitrification lab-scale wastewater treatment system. The aim was to investigate the difference between two approaches to bioaugmentation: one in which suspended overnight culture was used as inoculum and another where bacteria immobilized in 1% agar beads were used. Pure cultures of the denitrifying bacteria Comamonas denitrificans ATCC 700936T were used in the experiments. The effect of bioaugmentation on the system was monitored using fluorescent in situ hybridization (FISH) and denitrification activity tests. The bioaugmentation with suspended bacteria showed a rapid initial (4 days) increase in denitrification activity. After 8 days the activity declined to the level of the reference system and cells of C. denitrificans were no longer detectable. Augmentation with agar-embedded bacteria resulted in a small increase in activity and very few bacteria of C. denitrificans could be observed.

Ort, förlag, år, upplaga, sidor
ACTA Press, 2006
Nyckelord
Bioaugmentation, denitrification, fluorescent in situ hybridization, immobilization, wastewater treatment, Comamonas denitrificans
Nationell ämneskategori
Miljövetenskap
Identifikatorer
urn:nbn:se:kth:diva-10152 (URN)000236368300012 ()2-s2.0-38049140883 (Scopus ID)978-088986554-9 (ISBN)
Konferens
2nd IASTED International Conference on Advanced Technology in the Environmental Field Location: Lanzarote, Spain, Date: FEB 06-08, 2006
Anmärkning

QC 20100622

Tillgänglig från: 2009-03-25 Skapad: 2009-03-25 Senast uppdaterad: 2014-11-07Bibliografiskt granskad
2. Biofilm formation and interactions of bacterial strains found in wastewater treatment systems
Öppna denna publikation i ny flik eller fönster >>Biofilm formation and interactions of bacterial strains found in wastewater treatment systems
2008 (Engelska)Ingår i: FEMS Microbiology Letters, ISSN 0378-1097, E-ISSN 1574-6968, Vol. 283, nr 1, s. 83-90Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Biofilm formation and adherence properties of 13 bacterial strains commonly found in wastewater treatment systems were studied in pure and mixed cultures using a crystal violet microtiter plate assay. Four different culture media were used, wastewater, acetate medium, glucose medium and diluted nutrient broth. The medium composition strongly affected biofilm formation. All strains were able to form pure culture biofilms within 24 h in at least one of the tested culture media and three strains were able to form biofilm in all four culture media, namely Acinetobacter calcoaceticus ATCC 23055, Comamonas denitrificans 123 and Pseudomonas aeruginosa MBL 0199. The adherence properties assessed were initial adherence, cell surface hydrophobicity, and production of amyloid fibers and extracellular polymeric substances. The growth of dual-strain biofilms showed that five organisms formed biofilm with all 13 strains while seven formed no or only weak biofilm when cocultured. In dual-strain cultures, strains with different properties were able to complement each other, giving synergistic effects. Strongest biofilm formation was observed when a mixture of all 13 bacteria were grown together. These results on attachment and biofilm formation can serve as a tool for the design of tailored systems for the degradation of municipal and industrial wastewater.

Ort, förlag, år, upplaga, sidor
OXFORD: BLACKWELL PUBLISHING, 2008
Nyckelord
biofilm formation; FISH; initial adherence; wastewater treatment
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
urn:nbn:se:kth:diva-10153 (URN)10.1111/j.1574-6968.2008.01149.x (DOI)000255286100013 ()2-s2.0-42649086030 (Scopus ID)
Anmärkning
QC 20100622Tillgänglig från: 2009-03-25 Skapad: 2009-03-25 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
3. Assessment of carrier materials for biofilm formation and denitrification
Öppna denna publikation i ny flik eller fönster >>Assessment of carrier materials for biofilm formation and denitrification
2008 (Engelska)Ingår i: Vatten, ISSN 0042-2886, Vol. 64, s. 201-207Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
Lund: Föreningen vatten, 2008
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
urn:nbn:se:kth:diva-10154 (URN)
Anmärkning
QC 20100622Tillgänglig från: 2009-03-25 Skapad: 2009-03-25 Senast uppdaterad: 2010-07-19Bibliografiskt granskad
4. Characterization of extracellular polymeric substances from denitrifying organism Comamonas denitrificans
Öppna denna publikation i ny flik eller fönster >>Characterization of extracellular polymeric substances from denitrifying organism Comamonas denitrificans
2009 (Engelska)Ingår i: Applied Microbiology and Biotechnology, ISSN 0175-7598, E-ISSN 1432-0614, Vol. 82, nr 3, s. 535-543Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Extracellular polymeric substances (EPS) play an important role in the formation and activity of biofilms in wastewater treatment (WWT). The EPS of the denitrifying biomarker Comamonas denitrificans strain 110, produced in different culture media and growth modes, were characterized. The EPS mainly contained protein (3-37%), nucleic acids (9-50%), and carbohydrates (3-21%). The extracellular DNA was found to be important for initial biofilm formation since biofilm, but not planktonic growth, was inhibited in the presence of DNase. The polysaccharide fraction appeared to consist of at least two distinct polymers, one branched fraction (A) made up of glucose and mannose with a molecular weight around 100 kDa. The other fraction (B) was larger and consisted of ribose, mannose, glucose, rhamnose, arabinose, galactose, and N-acetylglucosamine. Fraction B polysaccharides were mainly found in capsular EPS which was the dominant type in biofilms and agar-grown colonies. Fraction A was abundant in the released EPS, the dominant type in planktonic cultures. Biofilm and agar-grown EPS displayed similar overall properties while planktonic EPS showed clear compositional disparity. This study presents results on the physiology of a key WWT organism, which may be useful in the future development of improved biofilm techniques for WWT purposes.

Nyckelord
Biofilm; Comamonas denitrificans; GC-MS; Extracellular polymeric substances; HPAEC; Polysaccharides
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
urn:nbn:se:kth:diva-10155 (URN)10.1007/s00253-008-1817-3 (DOI)000263484600014 ()2-s2.0-60549106192 (Scopus ID)
Anmärkning
QC 20100622Tillgänglig från: 2009-03-25 Skapad: 2009-03-25 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
5. Biological nutrient removal by individual and mixed strain biofilms
Öppna denna publikation i ny flik eller fönster >>Biological nutrient removal by individual and mixed strain biofilms
(Engelska)Manuskript (Övrigt vetenskapligt)
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
urn:nbn:se:kth:diva-10157 (URN)
Anmärkning
QC 20100622Tillgänglig från: 2009-03-26 Skapad: 2009-03-26 Senast uppdaterad: 2010-07-19Bibliografiskt granskad
6. Persistence and competition of denitrifying biofilms subjected to a natural wastewater flora
Öppna denna publikation i ny flik eller fönster >>Persistence and competition of denitrifying biofilms subjected to a natural wastewater flora
(Engelska)Manuskript (Övrigt vetenskapligt)
Nationell ämneskategori
Industriell bioteknik
Identifikatorer
urn:nbn:se:kth:diva-10158 (URN)
Anmärkning
QC 20100622Tillgänglig från: 2009-03-26 Skapad: 2009-03-26 Senast uppdaterad: 2010-07-19Bibliografiskt granskad

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