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PhD Defense by Chenjing Jiang

Chenjing Jiang, Department of Chemistry and Bioscience will defend her thesis on: "Foam problems and form-forming microbes in anaerobic digesters at wastewater treatment plants”"

Time

27.02.2019 kl. 13.00 - 16.00

Description

TITLE:

"Foam problems and form-forming microbes in anaerobic digesters at wastewater treatment plants”

ABSTRACT:

Anaerobic digestion (AD) is a promising biotechnology and successfully implemented at wastewater treatment plants (WWTPs), where it stabilizes and minimizes the sewage sludge and meanwhile generates methane-rich biogas. With the development of culture-independent techniques, the knowledge of the microbiological processes of AD has been expanded considerably over the last decades. However, associations between operation/performance and specific microorganisms/function are still unclear. For example, little is known about microbes responsible for the foaming issue, one of the most common operational problems in the AD process. Therefore, it is of great importance to gain knowledge on both technical and microbiological aspects and establish the linkages between them in ADs.

The results in this PhD project have expanded the knowledge of microbial community structure and specific foam-forming microorganisms and the understanding between microbial community and key variables, foam-forming microorganisms, and foaming events in full-scale WWTP digesters.  The hope is that plant operators can benefit from this knowledge to achieve a stable AD process as well as make the right decisions on controlling foaming strategies. The large-scale survey, restricted to ADs at WWTPs, provided a full picture of technical and microbiological aspects as well as their associations, which could contribute to the future studies, such as functionality of specific microorganisms. With the help of culture-independent approaches, the identification of novel foam formers have significantly increased the knowledge of foaming in ADs. More studies are needed to characterize those novel microbes and their associations with entire microbial community in AD.

SUPERVISOR:

  • Professor Per Halkjær Nielsen, Dept. Chemistry and Bioscience, AAU, Denmark

ASSESSMENT COMMITTEE:

  • Associate Professor Lars Haastrup Pedersen (Chairman), Dept. Chemistry and Bioscience, AAU, Debmark
  • Associate Professor Åsa Davidsson, Dept. of Chemical Engineering, Lund University, Sweeden
  • Associate Professor Sasha D. Hafner, Department of Engineering, Aarhus University, Denmark

AFTER THE DEFENSE A SMALL RECEPTION WILL BE HELD AT FREDRIK BAJERS VEJ 7H. 

 

Price

Free

Host

Department of Chemistry and Bioscience, AAU, Section of Chemistry

Address

Fredrik Bajers Vej 7H, 9220 Aalborg Ø, room number: TBA

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