The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion
Due to the conversion of acetic acid into the weaker carbonic acid and CH4, the pH inside methanogenic aggregates is higher than in the bulk liq. The pH profiles in aggregates were measured with pH microelectrodes. These profiles strongly det. the macro-kinetics of the aggregate, by their influence...
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1993
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ftuniveindhoven:oai:library.tue.nl:621402 2023-05-15T15:52:43+02:00 The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion Beer, D de Huisman, JW Heuvel, JC van den Ottengraf, SPP Simon 1993 application/pdf http://repository.tue.nl/621402 en eng Copyright (c) Beer, D de Copyright (c) Huisman, JW Copyright (c) Heuvel, JC van den Copyright (c) Ottengraf, SPP Simon ISSN:0043-1354 Article / Letter to the editor 1993 ftuniveindhoven 2018-12-26T13:28:42Z Due to the conversion of acetic acid into the weaker carbonic acid and CH4, the pH inside methanogenic aggregates is higher than in the bulk liq. The pH profiles in aggregates were measured with pH microelectrodes. These profiles strongly det. the macro-kinetics of the aggregate, by their influence on the values of the growth parameters Ks and mmax. Acetate transport resistances were not limiting for the conversion rate in methanogenic aggregates. Nevertheless, the effectiveness factor h did not approach unity, but amounted to 0.57-0.62 in the acetate concn. range relevant for most methanogenic reactors. The value of h is detd. almost entirely by the pH profiles inside the aggregates. It was concluded that for the phys./math. description of the conversion in methanogenic aggregates, information on the pH gradients and the pH dependency of the growth parameters is indispensable. Batch expts. showed that acetate uptake by aggregates was not coupled directly to methanogenesis. Consumed acetate was not converted instantaneously to CH4, suggesting the conversion to proceed via a pool of acetate or reserve material. Article in Journal/Newspaper Carbonic acid Eindhoven University of Technology (TU/e): Research Portal |
institution |
Open Polar |
collection |
Eindhoven University of Technology (TU/e): Research Portal |
op_collection_id |
ftuniveindhoven |
language |
English |
description |
Due to the conversion of acetic acid into the weaker carbonic acid and CH4, the pH inside methanogenic aggregates is higher than in the bulk liq. The pH profiles in aggregates were measured with pH microelectrodes. These profiles strongly det. the macro-kinetics of the aggregate, by their influence on the values of the growth parameters Ks and mmax. Acetate transport resistances were not limiting for the conversion rate in methanogenic aggregates. Nevertheless, the effectiveness factor h did not approach unity, but amounted to 0.57-0.62 in the acetate concn. range relevant for most methanogenic reactors. The value of h is detd. almost entirely by the pH profiles inside the aggregates. It was concluded that for the phys./math. description of the conversion in methanogenic aggregates, information on the pH gradients and the pH dependency of the growth parameters is indispensable. Batch expts. showed that acetate uptake by aggregates was not coupled directly to methanogenesis. Consumed acetate was not converted instantaneously to CH4, suggesting the conversion to proceed via a pool of acetate or reserve material. |
format |
Article in Journal/Newspaper |
author |
Beer, D de Huisman, JW Heuvel, JC van den Ottengraf, SPP Simon |
spellingShingle |
Beer, D de Huisman, JW Heuvel, JC van den Ottengraf, SPP Simon The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
author_facet |
Beer, D de Huisman, JW Heuvel, JC van den Ottengraf, SPP Simon |
author_sort |
Beer, D de |
title |
The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
title_short |
The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
title_full |
The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
title_fullStr |
The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
title_full_unstemmed |
The effect of pH profiles in methanogenic aggregates on the kinetics of acetate conversion |
title_sort |
effect of ph profiles in methanogenic aggregates on the kinetics of acetate conversion |
publishDate |
1993 |
url |
http://repository.tue.nl/621402 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
ISSN:0043-1354 |
op_rights |
Copyright (c) Beer, D de Copyright (c) Huisman, JW Copyright (c) Heuvel, JC van den Copyright (c) Ottengraf, SPP Simon |
_version_ |
1766387817853747200 |