Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Microbial community struc… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Microbial community structure in activated sludge floc analysed by fluorescence in situ hybridization and its relation to floc stability

Artikel i vetenskaplig tidskrift
Författare Britt-Marie Wilén
Motoharu Onuki
Malte Hermansson
Dough Lumley
Takashi Mino
Publicerad i Water Research
Volym 42
Nummer/häfte 8-9
Sidor 2300-2308
ISSN 0043-1354
Publiceringsår 2008
Publicerad vid Institutionen för cell- och molekylärbiologi, mikrobiologi
Sidor 2300-2308
Språk en
Länkar Http://dx.doi.org/10.1016/j.watres....
Ämnesord activated sludge flocs, floc stability, fluorescence in situ hybridization (FISH), phylogenetic groups of bacteria, shear sensitivity
Ämneskategorier Biologiska vetenskaper, Industriell bioteknik, Vattenteknik

Sammanfattning

The efficiency of activated sludge treatment plants is dependent on the solid–liquid separation properties of the activated sludge. A critical parameter is the stability of the microbial flocs. Weak flocs deflocculate easily leaving increased concentrations of suspended solids in the effluent. The knowledge about how different bacteria are attached to the flocs and their influence on the bioflocculation is limited. In this study, the deflocculation of different phylogenetic groups of bacteria in activated sludge from a full scale plant was investigated. The experiments were carried out by using a shear method where the sludge flocs are deflocculated under controlled shear conditions. The degree of deflocculation was measured as increase in turbidity of the supernatant. Identification and quantification of the microbial community structure of both total activated sludge and deflocculated bacteria were conducted with group-specific gene probes for broad groups of bacteria (Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria and Actinobacteria) and fluorescence in situ hybridization (FISH). The microbial community structure of the deflocculated bacteria was different compared to the total activated sludge with a higher abundance of Gammaproteobacteria in the supernatant indicating that different groups of bacteria are bound with different strength to the floc surface. The results show that the bacteria in the outer parts of the flocs are relatively loosely bound to the floc matrix and can be easily eroded from the surface when exposed to shear.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?