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- W2553529850 abstract "Anaerobic digestion (AD) is a key technology for biorefinery side streams. To ensure stable methane production, a balanced Bacteria - Archaea community is required. Several environmental factors, e.g. abrupt pH changes, organic overloading and high salt concentrations, can distort this delicate balance. Here we evaluated whether a bioelectrochemical system (BES) could improve stability and remediate AD systems which exhibited process failure. To evaluate this, a BES was introduced in three continuously stirred tank reactor (CSTR) systems, at a fixed potential difference of 1V and 0.5V and open circuit conditions respectively. Three other CSTR systems were operated under similar conditions without a BES. The reactors were fed with diluted molasses at an organic loading rate of 2 g COD L-1 d-1. Molasses was selected because of its high concentrations of salts, especially K+, which may inhibit methanogenesis. During the first 35 days of operation, all six reactors maintained a stable methane production of 0.6 L CH4 Lreactor-1 d-1. After that, methane production declined and volatile fatty acids (VFA) accumulated in the three reactors without a BES until 50% system inhibition was achieved after 90 days of operation. Methane production remained stable in the three reactors with BES, i.e. no decline in methane production was detected, which demonstrates the stabilizing effect of the BES. After 90 days the BES were transferred to the reactors with 50% system inhibition in order to evaluate the remediation potential of the BES. Immediately after introduction of the BES, remediation took place in the three reactors, i.e. a rise in CH4 production and VFA removal, although no difference between the treatments, could be detected, thus indicating the strong remediating capacity of the BES in AD. Microbial community analysis by means of DGGE and Q-PCR was carried out to evaluate the effect of the BES on the microbial community in AD. This study demonstrated that, in contrast to several other studies which could only increase methane production by introducing a BES in AD, a BES can remediate anaerobic digestion systems which exhibited severe process failure." @default.
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- W2553529850 date "2012-01-01" @default.
- W2553529850 modified "2023-09-27" @default.
- W2553529850 title "A bioelectrochemical system as stabilizing and remediating agent in anaerobic digestion" @default.
- W2553529850 hasPublicationYear "2012" @default.
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