Estudio a escala piloto de la desulfuración anóxica de biogás empleando un efluente nitrificado a partir de lixiviados de vertedero
type: CreativeWork
description: Biogas generated in landfills is a valuable source of renewable energy, the use of which is hindered by the presence of compounds that affect its quality, primarily hydrogen sulfide (H2S). This compound is corrosive and toxic, and its combustion generates sulfur oxides, necessitating its reduction or removal for most applications. Biological technologies offer a sustainable alternative to physicochemical methods, among which is anoxic desulfurization. However, this technology relies on electron acceptors such as nitrate/nitrite, which, if sourced from chemical reagents, increase process costs. Therefore, this Doctoral Thesis addresses this challenge from a circular economy perspective by proposing and validating a pilot-scale integrated system that couples two waste treatment processes: biogas purification and landfill leachate treatment. The study proposes using the nitrified effluent from ammonium-rich leachate as a low-cost source of nitrate/nitrite for anoxic biogas desulfurization, thereby reducing operational costs and facilitating the management of this complex waste stream. A key byproduct of the anoxic desulfurization process is elemental sulfur. This sulfur can be recovered from suspended-growth bioreactors for use as a fertilizer or as a raw material in the chemical industry. To optimize both the bioprocess and byproduct recovery, an analytical method was first developed and validated for the quantification of biogenic sulfur (S0) using gas chromatography with a pulsed flame photometric detector (GC-PFPD), combined with a simple sample preparation based on filtration and toluene extraction. This method exhibited an error of less than 5% when applied to samples from a laboratory-scale stirred-tank anoxic desulfurization bioreactor. Additionally, a recovery method for biogenic sulfur was optimized via coagulation-flocculation, achieving removal efficiencies exceeding 97% with a cationic flocculant at a dosage of 0.82 mg/L (0.5 mg flocculant per g S0) at a s…
abstract: Biogas generated in landfills is a valuable source of renewable energy, the use of which is hindered by the presence of compounds that affect its quality, primarily hydrogen sulfide (H2S). This compound is corrosive and toxic, and its combustion generates sulfur oxides, necessitating its reduction or removal for most applications. Biological technologies offer a sustainable alternative to physicochemical methods, among which is anoxic desulfurization. However, this technology relies on electron acceptors such as nitrate/nitrite, which, if sourced from chemical reagents, increase process costs. Therefore, this Doctoral Thesis addresses this challenge from a circular economy perspective by proposing and validating a pilot-scale integrated system that couples two waste treatment processes: biogas purification and landfill leachate treatment. The study proposes using the nitrified effluent from ammonium-rich leachate as a low-cost source of nitrate/nitrite for anoxic biogas desulfurization, thereby reducing operational costs and facilitating the management of this complex waste stream. A key byproduct of the anoxic desulfurization process is elemental sulfur. This sulfur can be recovered from suspended-growth bioreactors for use as a fertilizer or as a raw material in the chemical industry. To optimize both the bioprocess and byproduct recovery, an analytical method was first developed and validated for the quantification of biogenic sulfur (S0) using gas chromatography with a pulsed flame photometric detector (GC-PFPD), combined with a simple sample preparation based on filtration and toluene extraction. This method exhibited an error of less than 5% when applied to samples from a laboratory-scale stirred-tank anoxic desulfurization bioreactor. Additionally, a recovery method for biogenic sulfur was optimized via coagulation-flocculation, achieving removal efficiencies exceeding 97% with a cationic flocculant at a dosage of 0.82 mg/L (0.5 mg flocculant per g S0) at a s…
author: Torres Herrera, Sandra
language: eng
license: http://creativecommons.org/licenses/by-nc-nd/4.0/
date published: 2025-11-11
date modified: 2026-07-24T01:29:24Z
provider: Universidad de Cadiz
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universidad de Cadiz

PropertyValue
property ID: Handle
value: http://hdl.handle.net/10498/38195