title: Interaction effects of organic load and cycle time in an AsBr applied to a personal care industry wastewater treatment.
abstract: A mechanically stirred anaerobic sequencing batch reactor (ASBR) containing granular biomass was applied to the treatment of a wastewater simulating the effluent from a personal care industry. The ASBR was operated with cycle lengths (t(C)) of 8, 12 and 24 h and applied volumetric organic loads (AVOL) of 0.75, 0.50 and 0.25 gCOD/L.d, treating 2.0 L liquid medium per cycle. Stirring frequency was 150 rpm and the reactor was kept in an isothermal chamber at 30 °C. Increase in t(C) resulted in efficiency increase at constant AVOL, reaching 77% at t(C) of 24 h versus 69% at t(C) of 8 h. However, efficiency decreased when AVOL decreased as a function of increasing t(C), due to the lack of substrate in the reaction medium. Moreover, replacing part of the wastewater by a chemically balanced synthetic one did not yield the expected effect and system efficiency dropped.
authors.affiliation: Escola de Engenharia Mauá, Instituto Mauá de Tecnologia, Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil.
authors.forename: Ricardo Polisaitis
authors.initials: RP
authors.lastname: Oliveira
authors.forename: Suzana Maria
authors.initials: SM
authors.lastname: Ratusznei
authors.forename: José Alberto Domingues
authors.initials: JA
authors.lastname: Rodrigues
authors.forename: Marcelo
authors.initials: M
authors.lastname: Zaiat
authors.forename: Eugenio
authors.initials: E
authors.lastname: Foresti
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D006203:Hair Preparations; D007220:Industrial Waste; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006203:Hair Preparations; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D012967:Sodium Dodecyl Sulfate