Comparative evaluation of digestate and reject water as nutrient media for syngas biomethanation in thermophilic trickle-bed reactors 2025 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 435, article id 132893Article in journal (Refereed) Published

Abstract [en]

Syngas biomethanation facilitates the utilization of thermal gasification products. This study evaluated the performance of two liquid organic waste streams (manure-based digestate and reject water from digested sewage sludge) as nutrient media in thermophilic trickle-bed reactors (TBRs) over more than one year. Digestate achieved a Methane Evolution Rate (MER) of 4.5 L/(L<inf>pbv</inf>·d) with the highest so far published H<inf>2</inf> and CO conversion rates (>95 %). Reject water only led to a maximum MER of 1.0 L/(L<inf>pbv</inf>·d), while the addition of sulfur and phosphorus to the reject water resulted in improved MER of up to 3.1 L/(L<inf>pbv</inf>·d). The microbial analysis illustrated a similar microbial community structure and methanogenic abundance for both TBRs, with Methanothermobacter as the dominating methanogen both in the liquid phase and biofilm of the carriers. Carbon monoxide was likely converted to both methane and acetate.

Place, publisher, year, edition, pages

Elsevier Ltd , 2025. Vol. 435, article id 132893

Keywords [en]

Biosyngas, Carbon Monoxide, Hydrogen, Microbial Community, Phosphorus, Sulfur, Fertilizers, Methane, Methanogens, Nutrients, Sewage sludge, Synthesis gas, Bio-methanation, Digestate, Evolution rate, Microbial communities, Nutrient media, Reject waters, Syn gas, Thermophilics, Tricklebed reactors, methanol extraction residue, water, biofilm, bioreactor, digestibility, relative abundance, Article, community structure, comparative study, controlled study, Escherichia coli, gas evolution, gas flow, gasification, high performance liquid chromatography, hydraulic retention time, manure, methanogen, methanogenesis, Methanothermobacter, nonhuman, nutrient, organic waste, potential difference, retention time, sewage, sludge digestion, waste water treatment plant, chemistry, metabolism, microbiology, Bioreactors

National Category

Microbiology

Identifiers

URN: urn:nbn:se:ri:diva-79357DOI: 10.1016/j.biortech.2025.132893Scopus ID: 2-s2.0-105009111662OAI: oai:DiVA.org:ri-79357DiVA, id: diva2:2017683

Note

Article; Granskad

Available from: 2025-12-01 Created: 2025-12-01 Last updated: 2025-12-01Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Pizzul, Leticia

Search in DiVA

By author/editor

Gabler, FlorianPizzul, Leticia

By organisation

Agriculture and Environmental EngineeringBiorefinery and Energy

In the same journal

Bioresource Technology

On the subject

Microbiology

Search outside of DiVA

GoogleGoogle ScholarTotal: 39 hits