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Aplicação do processo Oxic-Settling-Anoxic para a minimização da produção de lamas ativadas
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Autores
Resumo(s)
The high amount of sludge generated by biological processes in wastewater treatment plants
(WWTP) is one of the biggest challenges in wastewater treatment. The need for development and
optimization of alternative technologies to minimize sludge production brings high relevance to
scientific research in the field. The aim of this study is to evaluate the introduction of an anoxic reactor
in the sludge return line of an activated sludge wastewater treatment system, as a strategy for
minimization of sludge production. The hydraulic retention time (HRT) chosen for the anoxic reactor
was 24 hours. Two consecutive trials using different treatment processes were performed: activated
sludge (reference trial) and Oxic-Settling-Anoxic (OSA) process (minimization trial). The results
showed good system response to organic overloading, not compromising removal efficiencies.
Microbiological analysis showed the presence of dense flakes and stability indicator organisms in the
treatment system, such as Vorticellas sp., Epistylis sp., Rotifers, Arcellas sp. and Aspidisca sp. The
comparison of the results between reference and minimization essays, showed a 78% sludge
production reduction for OSA process.
Descrição
Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia
Palavras-chave
domestic wastewater activated sludge oxic-settling-Anoxic sludge production
Contexto Educativo
Citação
Pires, A.S.C.D. - Aplicação do processo Oxic-Settling-Anoxic para a minimização da produção de lamas ativadas. Lisboa: ISA, 2014, 62 p.