title: Ozone and hydrogen peroxide as strategies to control biomass in a trickling filter to treat methanol and hydrogen sulfide under acidic conditions.
abstract: The operation and performance of a biotrickling filter for methanol (MeOH) and hydrogen sulfide (H2S) removal at acid pH was studied. Excess biomass in the filter bed, causing performance loss and high pressure drop, was controlled by intermittent addition, of ozone (O3) and hydrogen peroxide (H2O2). The results showed that after adaptation to acid pH, the maximum elimination capacity (EC) reached for MeOH was 565 g m-3h-1(97 % RE). High MeOH loads resulted in increased biomass concentration within the support, triggering reductions in the removal efficiency (RE) for both compounds close to 50 %, and high pressure drop. At this stage, an inlet load of 150.2 ± 16.7 g m-3h-1of O3was fed by 38 days favoring biomass detachment, and EC recovery and lower pressure dropped with a maximum elimination capacity of 587 g m-3h-1(81 % RE) and 15.8 g m-3h-1(97 % RE) for MeOH and H2S, respectively. After O3addition, a rapid increase in biomass content and higher fluctuations in pressure drop were observed reducing the system performance. A second treatment with oxidants was implemented feeding a O3load of 4.8 ± 0.1 g m-3h-1for 7 days, followed by H2O2addition for 23 days, registering 607.5 gbiomassL-1packingbefore and 367.5 gbiomassL-1packingafter the oxidant addition. PCR-DGGE analysis of different operating stages showed a clear change in the bacterial populations when O3was present while the fungal population was less affected.
authors.affiliation: Posgrado en Ciencias Naturales e Ingeniería, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Avenida Vasco de Quiroga 4871. Col. Santa Fé. Delegación Cuajimalpa de Morelos, C.P, 05348, Mexico City, Mexico.
authors.forename: Teresa
authors.initials: T
authors.lastname: García-Pérez
authors.affiliation: Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Avenida Vasco de Quiroga 4871. Col. Santa Fé. Delegación Cuajimalpa de Morelos, C.P, 05348, Mexico City, Mexico.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Le Borgne
authors.affiliation: Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Avenida Vasco de Quiroga 4871. Col. Santa Fé. Delegación Cuajimalpa de Morelos, C.P, 05348, Mexico City, Mexico. srevah@correo.cua.uam.mx.
authors.forename: Sergio
authors.identifier: http://orcid.org/0000-0001-9585-4575
authors.initials: S
authors.lastname: Revah
mesh_terms: D000393:Air Pollutants / Q000378:metabolism*; D000890:Anti-Infective Agents / Q000378:metabolism*; D018533:Biomass; D004783:Environmental Microbiology; D005374:Filtration / Q000379:methods*; D006861:Hydrogen Peroxide / Q000378:metabolism*; D006862:Hydrogen Sulfide / Q000378:metabolism*; D000432:Methanol / Q000378:metabolism*; D010126:Ozone / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D000890:Anti-Infective Agents; D010126:Ozone; D006861:Hydrogen Peroxide; D000432:Methanol; D006862:Hydrogen Sulfide
keywords: Biomass; Biotrickling filter; H2O2; Ozone; Pressure drop; pH