title: Textile effluent treatment in a UASB reactor followed by submerged aerated biofiltration.
abstract: An upflow anaerobic sludge bed (UASB)-submerged aerated biofilter (SAB) system that treats effluents from a jeans factory was evaluated. The 210-day operational period was divided into three phases (PI, PII and PIII), each with a different hydraulic retention time (HRT in h) and organic loading rate (OLR in kg COD/m3.d). In PI, the best performance was achieved using the UASB (HRT 24, OLR 1.3) with COD and color removal efficiencies of 59 and 64%, respectively; the corresponding values were 77 and 86% for the final effluent. In PII, the efficiencies were 50 and 55% using the UASB (HRT 16, OLR 1.2), respectively, and 69 and 81% for the final system effluent, respectively. In PIII, the UASB (HRT 12 and ORL 3.2) showed the poorest performance; the efficiencies decreased to 48 and 50%, respectively. The same phenomenon occurred in the system with corresponding efficiencies decreasing to 69 and 61%. Throughout the experiment, the system removal efficiencies were between 57 and 88% for nitrogen and between 14 and 63% for sulfate. The final effluent showed relatively non-toxicity or moderate toxicity using Daphnia magna as an indicator. Therefore, the overall results showed that the use of a sequential anaerobic-aerobic system is promising for treatment of textile industrial wastewater.
authors.affiliation: Department of Civil Engineering, Laboratory of Environmental Sanitation, Federal University of Pernambuco, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária, Recife PE, Brazil.
authors.forename: A D N
authors.initials: AD
authors.lastname: Ferraz
authors.forename: M T
authors.initials: MT
authors.lastname: Kato
authors.forename: L
authors.initials: L
authors.lastname: Florencio
authors.forename: S
authors.initials: S
authors.lastname: Gavazza
mesh_terms: D019149:Bioreactors; D004396:Coloring Agents / Q000737:chemistry; D005232:Fatty Acids, Volatile / Q000737:chemistry; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen; D013455:Sulfur; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D013455:Sulfur; D009584:Nitrogen; D010100:Oxygen