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Benedikt Bierer

 Benedikt Bierer

Benedikt Bierer

Albert-Ludwigs-University Freiburg
IMTEK - Department of Microsystems Engineering
Georges-Köhler-Allee 102
79110 Freiburg
Phone: +49 (0)761 203-97632
Fax: +49 (0)761 203-67684

Research project

Design and Development of a reliable gas measurement system for an efficient operation of biogas plants

A reliable, undisturbed operation of biogas plants demands the knowledge of the composition of the produced gas, especially in terms of possible corrosions caused by occurring hydrogen sulfide. Co-generation plants attached to the biogas fermenter demand for complying limits of H2S concentration to minimize damage to the combustion engines. A continuous monitoring of the H2S content can prevent corrosion induced failure on an early stage.

In parallel, the level of methane (CH4) provides basic information on the fundamental digestion processes. Low CH4 levels indicate inhibitions in the biochemical reaction chain and incomplete decomposition. Measuring the content is thus prerequisite for defining changes in the digestion routine. In addition it allows for determination of the calorific value, crucial when upgrading to biomethane, a highly significant emerging scenario. Almost all future facilities are configured for gas upgrading, as it offers efficient energy storage and distribution.

Based on the described requirements and challenges reliable and accurate sensory units shall be developed, which are able to measure both the methane and the hydrogen sulfide concentration selectively. This shall lead to an innovative, competitive measurement unit, superior to existing solutions, which are either lacking of selectivity or long-term stability or are too expensive for a broad applicability.

Curriculum Vitae

2015 - TodayPhD Student at DENE
2012 - 2014
University of Freiburg, IMTEK
M.Sc. in Microsystems Engineering
  • Focus: Sensors and Actuators, Biomedical Engineering
2009 - 2012
University of Freiburg, IMTEK
B.Sc. in Microsystems Engineering
1988Born in Freiburg



  • V Wittstock, L Scholz, B Bierer, A O Perez, J Wöllenstein, S Palzer
    Design of a LED-based sensor for monitoring the lower explosion limit of methane
    2017 Sens Actuator B Chem, Band: 247, Seiten: 930 - 939, Article in Press, DOI: 10.1016/j.snb.2017.03.086
  • L Scholz, A O Perez, B Bierer, P Eaksen, J Wollenstein, S Palzer
    Miniature low-cost Carbon Dioxide Sensor for Mobile Devices
    2017 Ieee Sens J, Band: 17, Nummer: 1, Seiten 2889 - 2895, Article in Press, DOI: 10.1109/JSEN.2017.2682638
  • AO Perez, V Kallfaß-de Frenes, A Filbert, J Kneer, B Bierer, P Held, P Klein, J Wöllenstein, D Benyoucef, S Kallfaß, U Mescheder, S Palzer
    Odor-sensing system to support social participation of people suffering from incontinence
    2017 Sensors, Band: 17, Nummer: 1, Article in Press, DOI: 10.3390/s17010058
  • H Gao, H Jia, B Bierer, J Wöllenstein, Y Lu, S Palzer
    Scalable gas sensors fabrication to integrate metal oxide nanoparticles with well-defined shape and size
    2017 Sens Actuator B Chem, Article in Press, DOI: 10.1016/j.snb.2017.04.031
  • Benedikt Bierer, Alvaro Ortiz Perez, Jürgen Wöllenstein, Stefan Palzer, In-situ Biogas Sensing System for Enabling Spatially Resolved Online Determination of the Gas Composition of the Fermenter, Procedia Engineering, Volume 168, 2016, Pages 1634-1637, Article in Press, DOI: 10.1016/j.proeng.2016.11.478
  • S. Knbelspies, B. Bierer, A. O. Perez, J. Wöllenstein, J. Kneer, S.Palzer, 2016: Low-cost gas sensing system for the reliable and precise measurement of methane, carbon dioxide and hydrogen sulfide in natural gas and biomethane. In: Sensors and Actuators, Article in Press, DOI: 10.1016/j.snb.2016.03.022
  • B. Bierer, J. Kneer, J. Wöllenstein, S. Palzer, 2016: MEMS based metal oxide sensor for simultaneous measurement of gas induced changes of the heating power and the sensing resistance. In: Microsystem Technologies, Article in Press, DOI: 10.1007/s00542-016-2862-y.
  • J. Kneer, S. Knobelspies, B. Bierer, J. Wöllenstein, S. Palzer, 2016: New method to selectively determine hydrogen sulfide concentrations using CuO layers. In: Sensors and Actuators B 222, pp. 625-631, DOI: 10.1016/j.snb.2015.08.071.

Conference contributions

  • Towards demand-driven biogas plants: Real-time determination of biogas quality
    B. Bierer, H.-J. Nägele, L. Scholz, A. Ortiz Perez, J. Wöllenstein, A. Lemmer, S. Palzer
    Second Place Poster Slam, 3rd International Conference on Monitoring and Process Control of Anaerobic Digestion Plants, Leipzig, 29-30 March 2017
  • L. Scholz, A. Ortiz Perez, B. Bierer, P. Eaksen J. Wöllenstein, S. Palzer: Carbon dioxide sensor for mobile devices: A novel approach for low-power consuming, highly sensitive NDIR sensors, IEEE Sensors 2016, Orlando, FL, Oct 30 – Nov 2 2016
  • B. Bierer, A. O. Perez, J. Wöllenstein, S.Palzer, : In-situ biogas sensing system for enabling spatially resolved online determination of the gas composition of the fermenter. Presentation; 30th Eurosensors Conference, EUROSENSORS 2016, Budapest, 4-7 September 2016
  • A. O. Perez, B. Bierer, P. Eaksen, J. Wöllenstein, S.Palzer, : Gauging indoor air quality with inexpensive gas sensing technologies. Poser; 30th Eurosensors Conference, EUROSENSORS 2016, Budapest, 4-7 September 2016
  • B. Bierer ; J. Kneer ; J. Wöllenstein ; S. Palzer: MEMS-based platform optimized for inkjet printing of nano-sized, gas sensitive functional metal oxides to enable the measurement of gas induced changes of the heating power. Proc. SPIE 9517, Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems, 951714 (May 21, 2015), DOI: 10.1117/12.2178976.
  • S. Knobelspies; B. Bierer; J. Wöllenstein; J. Kneer; S. Palzer: Towards In-situ Biogas Sensing. EUROSENSORS 2015, DOI: 10.1016/j.proeng.2015.08.606.


by Florian Opitz last modified May 22, 2017 06:01 PM
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