Title:
Clarifying Agents Affect Chlorine Concentration in Biomethane from Sewage Sludge
Author(s):
Borin, D., Torre, M., Segreto, M., Tomassetti, L., Paolini, V., Petracchini, F., Carnevale, M., Gallucci, F., Scaglione, D.
Document(s):
Paper
Abstract:
This study reports a monitoring campaign of biomethane production from sewage sludge at industrial scale, conducted from December 2016 to March 2017. The considered case study is focused on the municipality of Milan, Northern Italy. Biomethane was produced from the biogas upgrading in a pilot scale vacuum swing adsorption (VSA) plant based on activated carbon and zeolite 13X, from December 2016 to March 2017. Critical levels were observed in the biogas for of H2S and HCl, whose concentrations were 1570 and 26.8 mg m-3, respectively. Regarding sulfur, a simultaneous and reversible adsorption on 13X zeolite was achieved for H2S and CO2, and carbon filters played a minor role in desulfurisation. The presence of HCl is due to clarifying agents, and its removal is necessary in order to meet the required biomethane characteristics. For this purpose, additional carbon-supported basic adsorbents were successfully used to remove this contaminant. This study also highlights the interference of CO2 towards HCl if sampling is performed in compliance with the new EU standard for biomethane.
Keywords:
biogas, sewage sludge, pollution
Topic:
Biomass Resources
Subtopic:
Municipal and industrial wastes
Event:
27th European Biomass Conference and Exhibition
Session:
1AV.2.6
Pages:
139 - 140
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-1AV.2.6
Price:
FREE
