title: A simple and rapid one-time method to evaluate the non-acidic gas content from bioprocesses.
abstract: This paper presents a rapid less than 2 min and low-cost method involving the use of alkali solution to capture the acidic gasses from a biogas, thereby providing an estimate of the percentage of non-acidic gasses. Such a method was mentioned in the literature but never fully described or optimized. After sampling an aliquot of gas from bioprocess, gas was injected in a sealed flask with a 3 M NaOH solution, and after equilibrium was obtained, the non-acidic gas volume was measured. The method was first calibrated with certified gasses with an accuracy observed between 98 and 105%. Regarding the validation step, certified standard gas mixtures and nine biogas-laboratory batch reactors were used, the overall accuracy reported was 103 + 3%. This rapid and low-cost method may either be used in laboratory conditions as a quick and low cost alternative to standard analysis equipment or in addition as a routine field control method used on full-scale plants.
authors.affiliation: Département des Sciences et Techniques Agro-Industrielles, Institut Polytechnique LaSalle Beauvais, rue Pierre Waguet, BP 30313, 60026, Beauvais Cédex, France.
authors.forename: David
authors.initials: D
authors.lastname: Bassard
authors.forename: Laura
authors.initials: L
authors.lastname: André
authors.forename: Nicolas
authors.initials: N
authors.lastname: Dotal
authors.forename: Ludovic
authors.initials: L
authors.lastname: Valentin
authors.forename: Maurice
authors.initials: M
authors.lastname: Nonus
authors.forename: André
authors.initials: A
authors.lastname: Pauss
authors.forename: Thierry
authors.initials: T
authors.lastname: Ribeiro
mesh_terms: D019149:Bioreactors; D005740:Gases / Q000378:metabolism*; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature
chemical_list: D005740:Gases; D012972:Sodium Hydroxide