Innovative additives for chemical desulphurisation in biogas processes: A comparative study on iron compound products

Publikations-Art

Zeitschriftenbeitrag (peer-reviewed)

Autoren

Nägele, H.J.; Steimbrenner, J.; Hermanns, G.; Holstein, V.; Haag, N.L.; Oechsner, H.

Erscheinungsjahr

2017

Veröffentlicht in

Biochemical Engineering Journal

Verlag

Elsevier

Band/Volume

121/

ISBN / ISSN / eISSN

1369-703X

DOI

10.1016/j.bej.2017.01.006

Seite (von - bis)

181-187

Schlagworte

anaerobic digestion, Biogas, Entschwefelung

Chemical desulphurisation with four iron compound additives in fermenting substrates for biogas production was studied in continuous 16 l laboratory anaerobic digestion tests. The experiments were performed to investigate the H₂S reduction in three phases including two dosing quantities. Subsequently, the supplementation was stopped. The removal efficiency (RE) increased to 37–51% towards the end of phase 1 and to 61–77% after phase 2. A significant difference in reaction time was measured at the start and at the end of supplementation. FeCl₂ showed the fastest response and the highest RE, especially in the first days after applying the treatment. FeOOH Type I and II also showed a high RE throughout the experiment and an additional depot effect was measured after stopping the supplementation, keeping the H₂S level lower for a period of at least 11 days. Fe(OH)₃ showed the lowest desulfurization effect.