title: Effect of organic loading rate on the performance of two-stage anaerobic digestion of the organic fraction of municipal solid waste (OFMSW).
abstract: Two-stage anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) was carried out: hydrolysis and acidogenesis in a continuous anaerobic hydrolytic leach bed (AHLB) reactor loaded at different rates (Bv = 3.8-7 gVSSL⁻¹d⁻¹) and methanogenesis of leachates, diluted with municipal wastewater in an upflow anaerobic sludge blanket (UASB) reactor at organic loading rates of 6.6-13 gCODLr⁻¹d⁻¹. In the AHLB reactor, 51-76% and 58-71% volatile solids and chemical oxygen demand (COD) removal efficiencies were obtained. During the hydrolysis and acidogenesis phases, the effluents were at pH 4.93, the leachate had a volatile fatty acids concentration of 35 g/L and the biogas was composed only of CO₂. The average methane production in the UASB in the load of 4.4 gVS L⁻¹ d⁻¹ in the AHLB was 3.32 LCH4Lr⁻¹d⁻¹ (yCH4 = 80%), with COD removal efficiency of 95% and methane yield 279 LCH4KgVS⁻¹OFMSW degraded.
authors.affiliation: Biotechnology Department, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Iztapalapa, D.F, México E-mail: isabelropi@hotmail.com; Division of Environmental Technology, Universidad Tecnológica de Nezahualcóyotl, Circuito Universidad Tecnológica S/N Col. Benito Juárez, 57900 Nezahualcóyotl, Edo. de México, México.
authors.forename: Reyna I
authors.initials: RI
authors.lastname: Rodríguez-Pimentel
authors.affiliation: Chemistry Department, Universidad de Oriente, Patricio Lumumba s/n, 223.0.06824, Santiago de Cuba, Cuba.
authors.forename: Suyen
authors.initials: S
authors.lastname: Rodríguez-Pérez
authors.affiliation: Biotechnology Department, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Iztapalapa, D.F, México E-mail: isabelropi@hotmail.com.
authors.forename: Oscar
authors.initials: O
authors.lastname: Monroy-Hermosillo
authors.affiliation: Biotechnology Department, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Iztapalapa, D.F, México E-mail: isabelropi@hotmail.com.
authors.forename: Florina
authors.initials: F
authors.lastname: Ramírez-Vives
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000737:chemistry*; D006868:Hydrolysis; D008697:Methane / Q000378:metabolism; D012722:Sewage; D062611:Solid Waste / Q000032:analysis*
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D062611:Solid Waste; D008697:Methane