title: Wet air oxidation of resorcinol as a model treatment for refractory organics in wastewaters from the wood processing industry.
abstract: Wastewater treatment systems are important tools to enhance sustainability in terms of reducing environmental impact and complying with sanitary requirements. This work addresses the wet air oxidation (WAO) process for pre-treatment of phenolic wastewater effluents. The aim was to increase biodegradability prior to a subsequent anaerobic stage. In WAO laboratory experiments using a micro-autoclave, the model compound resorcinol was degraded under different oxygen availability regims within the temperature range 150 °C-270 °C. The activation energy was determined to be 51.5 kJ/mol. Analysis of the products revealed that after 3 h of reaction at 230 °C, 97.5% degradation of resorcinol was achieved. At 250 °C and the same reaction time complete removal of resorcinol was observed. In this case the total organic carbon content was reduced down to 29%, from 118.0 mg/L down to 34.4 mg/L. Under these process conditions, the pollutant was only partially mineralized and the ratio of the biological oxygen demand relative to the chemical oxygen demand, which is 0.07 for resorcinol, was increased to a value exceeding 0.5. The main by-product acetic acid, which is a preferred compound for methanogenic bacteria, was found to account for 33% of the total organic carbon.
authors.affiliation: Universidad Autónoma del Estado de México-Facultad de Ingeniería, Cerro de Coatepec s/n Col. San Buenaventura, C.P. 50130 Toluca, Estado de México, México; Instituto de Ingeniería de la Universidad Nacional Autónoma de México (UNAM), C.P. 04510 Coyoacán, México, D.F., México. Electronic address: bweber@uaemex.mx.
authors.forename: Bernd
authors.initials: B
authors.lastname: Weber
authors.affiliation: Instituto de Ingeniería de la Universidad Nacional Autónoma de México (UNAM), C.P. 04510 Coyoacán, México, D.F., México.
authors.forename: Alma
authors.initials: A
authors.lastname: Chavez
authors.affiliation: Instituto de Ingeniería de la Universidad Nacional Autónoma de México (UNAM), C.P. 04510 Coyoacán, México, D.F., México.
authors.forename: Julio
authors.initials: J
authors.lastname: Morales-Mejia
authors.affiliation: Competence Center for Energy and Environmental Engineering, University of Applied Sciences THM, Campus Giessen, 35390 Giessen, Germany.
authors.forename: Sabrina
authors.initials: S
authors.lastname: Eichenauer
authors.affiliation: Competence Center for Energy and Environmental Engineering, University of Applied Sciences THM, Campus Giessen, 35390 Giessen, Germany.
authors.forename: Ernst A
authors.initials: EA
authors.lastname: Stadlbauer
authors.affiliation: Instituto de Ingeniería de la Universidad Nacional Autónoma de México (UNAM), C.P. 04510 Coyoacán, México, D.F., México.
authors.forename: Rafael
authors.initials: R
authors.lastname: Almanza
mesh_terms: D001673:Biodegradation, Environmental; D007220:Industrial Waste / Q000032:analysis*; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010636:Phenols / Q000032:analysis; D012118:Resorcinols / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*; D014934:Wood / Q000737:chemistry
chemical_list: D007220:Industrial Waste; D010100:Oxygen; D010636:Phenols; D012118:Resorcinols; D062065:Wastewater; C031389:resorcinol
keywords: Industrial Wastewater; Oxidation process; Pretreatment; Recalcitrant