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Methane potential from paper industry wastes and investigation of the methanogens involved

The anaerobic digestion of organic wastes is a sustainable waste management strategy that is gaining significance due to the increasing costs of fossil fuels and the urgent need to mitigate anthropogenic global warming. Wastes generated by the paper industry are potential substrates for anaerobic digestion and bioenergy production. In this study we used an automatic methane potential test system (AMPTS) to investigate the biogas production potential from lignocellulosic and cellulosic paper industry wastes. The materials were subjected to both mesophilic and thermophilic treatment for 23 days, and various chemical (1% NaOH), mechanical (autoclave and ultrasonic) and enzymatic (ligninase, xylanase, cellulase mixture) pre-treatments of wastes were investigated. The methanogenic communities were investigated using DGGE and the ANAEROCHIP microarray.

Highest methane levels were produced under thermophilic conditions. Results indicated that a combination of enzymatic with ultrasonic treatment of the cellulosic pulp and lignocellulosic sediment wastes resulted in the highest methane production at mesophilic temperatures (407.5 and 221.7 ml CH₄ g^-1 VS, respectively). DGGE revealed that the temperature used in anaerobic digestion exerted the greatest influence on methanogenic community composition, and that the methanogenic communities present after anaerobic digestion did not vary significantly, despite different pre-treatments being applied. Microarray analysis also revealed similar communities in the samples, which were dominated by Methanoculleus and Methanosarcina but also included Methanobrevibacter, Methanosphaera and an uncultured methanogen. Results indicate some potential for use of these paper industry wastes in biogas production.

Copyright:	© European Compost Network ECN e.V.
Quelle:	Orbit 2014 (Juni 2014)
Seiten:	0
Preis:	€ 0,00
Autor:	I. Franke-Whittle Andreas Walter H. Insam
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