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Related Experiment Video

Updated: Jun 20, 2026

Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

Published on: June 15, 2014

Novel upflow anaerobic solid-state (UASS) reactor.

Jan Mumme¹, Bernd Linke, Rainer Tölle

¹Leibniz Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany. jmumme@atb-potsdam.de

Bioresource Technology

|September 15, 2009

Summary

A novel upflow anaerobic solid-state (UASS) reactor with liquor recirculation shows promise for organic waste digestion. Recirculation improved volatile fatty acid management and enhanced methane yield contribution from anaerobic filters.

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Area of Science:

Biotechnology
Environmental Engineering
Anaerobic Digestion

Background:

Upflow anaerobic solid-state (UASS) reactors are emerging technologies for organic waste treatment.
Managing volatile fatty acids (VFAs) and optimizing methane yield are critical challenges in solid-state anaerobic digestion.

Purpose of the Study:

To assess the feasibility and performance of a novel UASS reactor with continuous liquor recirculation.
To investigate the impact of varying volatile solids (VS) loading rates on methane yield and VFA accumulation.

Main Methods:

A thermophilic UASS reactor (26.5L) was operated for 68 days using maize silage and straw.
Process liquor was recirculated through anaerobic filters to mitigate VFA buildup.
Volatile solids (VS) loading rate was increased from 7.1 to 17 g(VS)L(-1)d(-1).

Main Results:

Overall methane yield decreased from 384 to 312 kg(VS)(-1) as VS loading rate increased.
The contribution of anaerobic filters to methane yield rose significantly, from 12% to 70%.
Biodegradable particulate matter removal, measured by chemical oxygen demand (COD), ranged from 86-93% with a peak hydrolysis rate of 16.4 g(COD)L(-1)d(-1).

Conclusions:

The UASS reactor with liquor recirculation is a viable technology for efficient organic material digestion.
Recirculation effectively manages VFAs and enhances the performance of integrated anaerobic filters.
This system presents a promising solution for sustainable biogas production from diverse organic feedstocks.