First-order kinetics of landfill leachate treatment in a pilot-scale anaerobic sequence batch biofilm reactor

• Published in: Journal of environmental management 2014-12, Vol.145, p.385-393
• Main Authors: Contrera, Ronan Cleber, da Cruz Silva, Katia Cristina, Morita, Dione Mari, Domingues Rodrigues, José Alberto, Zaiat, Marcelo, Schalch, Valdir
• Format: Article
• Language: English
• Subjects: Anaerobic sequence batch biofilm reactor; Anaerobic treatment; Anaerobiosis; Animal, plant and microbial ecology; Applied ecology; Biofilms; Biofilms - growth & development; Biological and medical sciences; Biological Oxygen Demand Analysis; Biomass; Bioreactors - microbiology; Brazil; Conservation, protection and management of environment and wildlife; First-order kinetic model; Fundamental and applied biological sciences. Psychology; General aspects; Kinetics; Landfill; Landfill leachate; Leachates; Methanosarcina - growth & development; Models, Theoretical; Pilot Projects; Reactors; Temperature; Temperature–activity coefficient; Water Pollutants, Chemical - analysis; Water Purification - instrumentation; Water Purification - methods
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2014.07.013

This paper reports the kinetics evaluation of landfill leachate anaerobic treatment in a pilot-scale Anaerobic Sequence Batch Biofilm Reactor (AnSBBR). The experiment was carried out at room temperature (23.8 ± 2.1 °C) in the landfill area in São Carlos-SP, Brazil. Biomass from the bottom of a local landfill leachate stabilization pond was used as inoculum. After acclimated and utilizing leachate directly from the landfill, the AnSBBR presented efficiency over 70%, in terms of COD removal, with influent COD ranging from 4825 mg L−1 to 12,330 mg L−1. To evaluate the kinetics of landfill leachate treatment, temporal profiles of CODFilt. concentration were performed and a first-order kinetics model was adjusted for substrate consumption, obtaining an average k1 = 4.40 × 10−5 L mgTVS−1 d−1, corrected to 25 °C. Considering the temperature variations, a temperature–activity coefficient θ = 1.07 was obtained. Statistical “Randomness” and “F” tests were used to successfully validate the model considered. Thus, the results demonstrate that the first-order kinetic model is adequate to model the anaerobic treatment of the landfill leachate in the AnSBBR. •A pilot scale AnSBBR (1300 L total volume) was used for landfill leachate treatment.•A first-order kinetics model was successful adjusted to the experimental results.•It was determined the temperature–activity coefficient by temperature variations.•Statistical “Randomness” and “F” tests were used to validate the model considered.