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Details

Autor(en) / Beteiligte
Titel
Characterization of methanogenic activity during high-solids anaerobic digestion of sewage sludge
Ist Teil von
  • Biochemical engineering journal, 2016-05, Vol.109, p.96-100
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
  • •Microbial activity entirely decreased by 40–50% in high-solids sludge digestate.•Blocked mass transfer was the key reason for the deteriorated performance.•Metabolic pathways almost unchanged when solid concentration increased.•Hydrolysis was still the rate-limiting step during the degradation of cellulose High-solids anaerobic digestion of sewage sludge has advantages of smaller digesters and a lower energy requirement for heating than conventional digestion, but its efficiency is negatively influenced by high solids concentration. To discover the mechanism causing this deteriorative performance, the specific methanogenic activity (SMA) of high-solids digestate was measured using typical substrates including acetate, propionate, butyrate, glucose, microcrystalline cellulose and hydrogen and carbon dioxide. When the total solids content increased from 4.2% to 14.4%, the SMA of the digestate decreased 40%–50% for most substrates except hydrogen and carbon dioxide, mainly because of blocked mass transfer in the high-solids digestate. On the other hand, some features remained stable: acetotrophic methanogens exhibited more activity than hydrogenotrophic methanogens, butyrate fermentation rather than propionate fermentation was still the main metabolic pathway during the degradation of glucose and cellulose, and hydrolysis was still the rate-limiting step during the anaerobic digestion of cellulose.

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