Regenerative Energie
In sewage treatment plants (STPs), the anaerobic fermentation of sludge primarily aims at hygienic stabilization and reduction of mass. Recently however, a great potential has been seen regarding the addition of co-substrates in anaerobic treatment plants to increase biogas yields. The aim of this project was to compare the biotic and abiotic characteristics of STPs using or not using co-substrates in their digestion towers.
Fermenter sludges from different reactors were
sampled and physico-chemically analysed. Denaturing gradient gel
electrophoresis (DGGE) was conducted to obtain an initial impression of
differences in the bacterial and methanogenic community composition. Finally,
the adaption velocity of the microbial community and the quantitative methane
potential of three different reactors were tested with an Automatic Methane
Potential Test System (AMPTS) device, by using paracrystalline cellulose and a
mixture of primary and surplus sludge as reference co-substrates. All reactors
were operating stably. Co-substrate had a strong impact on bacterial community
composition. The two reactors that received biowaste clustered separately from
the other reactors. Their methanogenic communities were similar, with only 11%
differences in community composition. AMPTS data revealed equal methane
potentials in all reactor sludges. The adaption velocity was independent of
whether or not the STP processed co-substrates. According to these results,
microbial communities in STPs can easily and very quickly accommodate the
introduction of co-substrates in a reactor, even if they have not been adapted
to such an environment.
| Copyright: | © European Compost Network ECN e.V. |
| Quelle: | Orbit 2014 (Juni 2014) |
| Seiten: | 0 |
| Preis: | € 0,00 |
| Autor: | Andreas Walter Univ.-Prof. Mag. Dr. Michael Probst Mag.Dr. Christian Ebner H. Insam |
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