Enhancement of the performance of an anaerobic sequencing batch reactor treating low-strength wastewater through implementation of a variable stirring rate program
Document title: Enhancement of the performance of an anaerobic sequencing batch reactor treating low-strength wastewater through implementation of a variable stirring rate program
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308958
ISSN: 0104-6632
Authors: 1


2
Institutions: 1Instituto Maua de Tecnologia, Escola de Engenharia Maua, Sao Caetano do Sul, Sao Paulo. Brasil
2Universidade de Sao Paulo, Escola de Engenharia de Sao Carlos, Sao Carlos, Sao Paulo. Brasil
Year:
Season: Sep
Volumen: 21
Number: 3
Pages: 423-434
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental
English abstract This work focuses on enhancement of the performance of an anaerobic sequencing batch reactor with a six-vertical-blade-disk-turbine impeller, containing granulated biomass treating low-strength synthetic wastewater, through a study of the feasibility of implementing a variable stirring rate program. The reactor was operated at 30ºC and a six-hour cycle was used to treat approximately 2.0 L of the synthetic substrate with a chemical oxygen demand (COD) of nearly 500 mg/L. Two different stirring rate program were implemented: a constant rate of 50 rpm and a variable rate consisting of 75 rpm for one hour, 50 rpm for four hours and 25 rpm for 0.5 hour. The last 0.5 hour of the cycle was used for the settling step. In both cases, a very short start-up period and unfiltered and filtered substrate removal efficiencies of 81% and 88%, respectively, were attained. However, use of the variable stirring rate enhanced efficiency of the reactor dynamics without impairing biomass morphology, thus resulting in a reduction in the total cycle time and a possible decrease in energy consumption. Additionally, a simplified model of the anaerobic metabolic activity, using apparent kinetic parameters, was proposed as a consecutive first-order kinetic model with substrate and total volatile acid residual concentrations in order to analyze how the variable stirring rate affects reactor performance
Disciplines: Química,
Ingeniería
Keyword: Ingeniería ambiental,
Ingeniería química,
Reactores anaerobios,
Reactor discontinuo,
Reactores,
Desempeño,
Aguas residuales,
Tratamiento de aguas residuales
Keyword: Chemistry,
Engineering,
Chemical engineering,
Environmental engineering,
Anaerobic reactors,
Batch reactor,
Reactors,
Performance,
Waste water treatment,
Waste water
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