Effect of impeller type and stirring frequency on the behavior of an AnSBBR in the treatment of low-strength wastewater


Autoria(s): CUBAS, Selma A.; FORESTI, Eugenio; RODRIGUES, Jose Alberto D.; RATUSZNEI, Suzana M.; ZAIAT, Marcelo
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2011

Resumo

The influence of impeller type and stirring frequency on the performance of a mechanically stirred anaerobic sequencing batch reactor containing immobilized biomass on an inert support (AnSBBR - Anaerobic Sequencing Batch Biofilm Reactor) was evaluated. The biomass was immobilized on polyurethane foam cubes placed in a stainless-steel basket inside a glass cylinder. Each 8-h batch run consisted of three stages: feed (10 min), reaction (460 min) and discharge (10 min) at 30 degrees C. Experiments were performed with four impeller types, i.e., helical, flat-blade, inclined-blade and curved-blade turbines, at stirring frequencies ranging from 100 to 1100 rpm. Synthetic wastewater was used in all experiments with an organic-matter concentration of 530 +/- 37 mg/L measured as chemical oxygen demand (COD). The reactor achieved an organic-matter removal efficiency of around 87% under all investigated conditions. Analysis of the four impeller types and the investigated stirring frequencies showed that mass transfer in the liquid phase was affected not only by the applied stirring frequency but also by the agitation mode imposed by each impeller type. The best reactor performance at all stirring frequencies was obtained when agitation was provided by the flat-blade turbine impeller. (C) 2010 Elsevier Ltd. All rights reserved.

FAPESP (Fundacao de Amparo Pesquisa do Estado de Sao Paulo, Brasil)

CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, Brasil)

Identificador

BIORESOURCE TECHNOLOGY, v.102, n.2, p.889-893, 2011

0960-8524

http://producao.usp.br/handle/BDPI/17930

10.1016/j.biortech.2010.08.128

http://dx.doi.org/10.1016/j.biortech.2010.08.128

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

Relação

Bioresource Technology

Direitos

restrictedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #Anaerobic reactor #Batch reactor #Immobilized biomass #Mass transfer #Impellers #SEQUENCING BATCH REACTOR #PHASE MASS-TRANSFER #IMMOBILIZED BIOMASS #BIOFILM REACTOR #PERFORMANCE #AGITATION #Agricultural Engineering #Biotechnology & Applied Microbiology #Energy & Fuels
Tipo

article

original article

publishedVersion