title: Continuous treatment of azo acid dyes by photo-dependent denitrifying sludge.
abstract: Simultaneous removals of dye and nitrate by photo-dependent denitryfying sludge(PDDS) have been demonstrated in a continuous-flow bench-scale reactor. The best C/N for the degradation of azo dyes by PDDS was 1.5. The specific removal rate of azo dye AB92 decreased with a decrease in hydraulic retention time and increased with a decrease in solids retention time. The degradation rate of TOC decreased with a decrease in hydraulic retention time. AB92, which has nitro and hydroxyl substitutions in non-para positions, was uniquely degraded. During continuous flow treatment experiments using PDDS, complete degradation of azo dyes AB92 and AO20 at influent concentrations of 40 mg/L and 30 mg/L, respectively, was achieved with an HRT of 16.
authors.affiliation: Department of Environmental Engineering of Ochanomizu University, 2-1-1 Otsuka, Bunky-ku, Tokyo 112-8610, Japan. g0170419@edu.cc.ocha.ac.jp
authors.forename: Jing-Lan
authors.initials: JL
authors.lastname: Hong
authors.forename: Otaki
authors.initials: O
authors.lastname: Masahiro
authors.forename: D Joseph
authors.initials: DJ
authors.lastname: Rouse
authors.forename: Furukawa
authors.initials: F
authors.lastname: Kenji
mesh_terms: D001391:Azo Compounds / Q000378:metabolism*; D001673:Biodegradation, Environmental; D010777:Photochemistry; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013783:Textile Industry; D014865:Waste Disposal, Fluid; D014876:Water Pollution / Q000517:prevention & control; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D012722:Sewage