Methods for Sampling Biogas and Biomethane on Adsorbent Tubes after Collection in Gas Bags

Abstract

Biogas is a renewable energy source with many different production pathways and numerous excellent opportunities for use; for example, as vehicle fuel after upgrading (biomethane). Reliable analytical methodologies for assessing the quality of the gas are critical for ensuring that the gas can be used technically and safely. An essential part of any procedure aimed at determining the quality is the sampling and transfer to the laboratory. Sampling bags and sorbent tubes are widely used for collecting biogas. In this study, we have combined these two methods, i.e., sampling in a gas bag before subsequent sampling onto tubes in order to demonstrate that this alternative can help eliminate the disadvantages associated with the two methods whilst combining their advantages; with expected longer storage stability as well as easier sampling and transport. The results of the study show that two parameters need to be taken into account when transferring gas from a bag on to an adsorbent; the water content of the gas and the flow rate used during transfer of the gas on to the adsorbent.

Sustainable Italian Cities: The Added Value of Biomethane from Organic Waste

“…In 2016, an estimated 1.6 billion tons of carbon dioxide-equivalent (CO 2 eq) greenhouse gas (GHG) emissions were generated from solid waste management, representing approximately 5% of the global emissions [3]. The integration of renewable energy resources and sustainable development is fundamental for future generations [4,5]. There is a high relationship between the concepts of the green economy and the circular economy (CE) [6].…”

Comparison of different models to calculate the viscosity of biogas and biomethane in order to accurately measure flow rates for conformity assessment

“…Due to the large absolute biases obtained at this flow rate, it is not recommended to work at this flow rate. For the discussion below, these 10 values have not been considered as this flow rate is actually lower than the flow rate range recommended for sampling biogas and biomethane on sorbent tubes 6 , 8 .…”

“…tubes have been reported to be 50 mL/min for air, no value has yet been published for biogas or biomethane and flow rates from 10 to 200 mL/min are typically applied. Higher sampling flow rates in excess of 200 mL/min can also be used for short term monitoring (e.g., 10 min) 8 .…”

Environmental Decision Support System for Biogas Upgrading to Feasible Fuel

“…Based on the data and knowledge previously acquired, the removal efficiencies that can be achieved by each technology are calculated according the final use of the biogas and their requirements ( Figure 2). Only the technologies that meet the effluent application requirements are considered in the following level (supervision) using rule-based methodology [7,9,14,36].…”

“…In this sense, the other main compound in biogas is CO 2 (30-50%) followed by other gases under 2% (oxygen, nitrogen, hydrogen sulfide, etc.). Trace concentrations of aromatic hydrocarbons and siloxanes are often present in biogases from anaerobic digesters in WWTPs and landfills as well [8,9].…”