title: Enhanced biological denitrification in the cyclic rotating bed reactor with catechol as carbon source.
abstract: The performance of CRBR in denitrification with catechol carbon source is presented. The influence of inlet nitrate concentration, hydraulic retention time (HRT), media filling ratio and rotational speed of media on the performance of CRBR was investigated. The bioreactor could denitrify over 95% of the nitrate at an inlet concentration up to 1000 mg NO3(-)/L and a short HRT as low as 18 h. The optimum media filling ratio at which the maximum denitrification was achieved in the CRBR was 30% and the contribution of media at this condition was around 36%. The optimum ratio of media filling at which the maximum denitrification was 20 rpm and the contribution of rotational speed under this condition was around 17%. According to the findings, the CRBR is a high rate bioreactor and thus serves as an appropriate technology for denitrification of wastewaters containing a high concentration of nitrate and toxic organic compounds.
authors.affiliation: Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Moussavi
authors.affiliation: Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Seyed Javad
authors.initials: SJ
authors.lastname: Jafari
authors.affiliation: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; Center for Water Quality Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Kamyar
authors.initials: K
authors.lastname: Yaghmaeian
mesh_terms: D001673:Biodegradation, Environmental / Q000187:drug effects; D019149:Bioreactors; D002244:Carbon / Q000494:pharmacology*; D002396:Catechols / Q000494:pharmacology*; D058440:Denitrification / Q000187:drug effects*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation* / Q000379:methods*; D009566:Nitrates / Q000032:analysis; D010084:Oxidation-Reduction / Q000187:drug effects; D012399:Rotation; D013997:Time Factors
chemical_list: D002396:Catechols; D009566:Nitrates; D002244:Carbon; C034221:catechol
keywords: Biological denitrification; Cyclic bioreactor; Filling ratio; Rotating bed; Toxic carbon source