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Survey of protozoa and metazoa populations in wastewater treatment plants by im...
Amaral, A. L.; Motta, Maurício da; Pons, M. N.; Vivier, H.; Mota, M.; Ferreira, E. C.; Roche, N.The biota present in the activated sludge of a wastewater treatment plant are mainly composed of bacteria, Protozoa and Metazoa. The Protozoa and Metazoa species are important micro-organisms taking part in the ecosystem balance in wastewater treatment plants and are quite sensitive to physical, chemical and operational processes. Several authors have established relationships between the predominance of certai...
Estudo do Funcionamento de Estações de Tratamento de Esgotos por Análise de Ima...
Motta, Maurício da; Pons, M. N.; Roche, N.; Vivier, H.; Amaral, A. L.; Ferreira, E. C.; Mota, M.Um método baseado na análise de imagens foi desenvolvido para caracterizar os flocos de lodo ativado em termos do seu tamanho e forma (dimensão fractal) e da abundância de bactérias filamentosas. Após ter sido testado em experimentos em escala piloto, o método foi validado para estações de tratamento reais. Foram analisadas doze estações de tratamento de esgotos situadas na França e em Portugal, de tamanhos e p...
Characterisation of activated sludge by automated image analysis : validation o...
Motta, Maurício da; Amaral, A. L.; Casellas, M.; Pons, M. N.; Dagot, C.; Roche, N.; Ferreira, E. C.; Vivier, H.Automated methods based on the analysis of macro- and meso-scale images has been developed to characterise activated sludge in terms of size and shape (fractal dimension) of flocs and abundance of filamentous bacteria. After tests on pilot-scale reactors, the method has been validated on full-scale samples from twelve different wastewater treatment plants in France and Portugal.
Efeito da diluição na caracterização da biomassa de sistemas de tratamentos de ...
Motta, Maurício da; Amaral, A. L.; Neves, L.; Araya-Kroff, P.; Ferreira, E. C.; Alves, M. M.; Mota, M.; Roche, N.; Vivier, H.; Pons, M. N.O estudo da biomassa de sistemas de tratamento de efluentes por análise de imagem permite avaliar o seu estado de agregação assim como acompanhar as modificações por ela sofrida quando submetida a choques orgânicos ou hidráulicos. Certos processos de tratamento trabalham com uma forte concentração em biomassa, o que obriga a uma diluição prévia. O presente estudo avalia o efeito desta diluição sobre a caracteri...
The study of protozoa population in wastewater treatment plants by image analysis
Motta,M.da; Pons,M.N.; Vivier,H.; Amaral,A.L.; Ferreira,E.C.; Roche,N.; Mota,M.Protozoa are important microorganisms for the ecosystem balance in wastewater treatment plants. A procedure for their semi-automated identification and counting based on image analysis is proposed. The main difficulty is segmentation of the protozoa as most of them are in contact with the sludge. The protozoa are characterized by the size of their silhouette (area and length) and three shape factors (elongation...
Reconnaissance semi-automatique de la microfaune des boues activées des station...
Motta, Maurício da; Pons, M. N.; Vivier, H.; Roche, N.; Amaral, A. L.; Ferreira, E. C.; Mota, M.Une procédure a été développée pour la reconnaissance semi-automatique de protozoaires présents dans les boues activées. Après sélection sur l’image de la zone d’intérêt où se trouve l’individu, la taille et la forme de la silhouette de ce dernier sont caractérisées par onze paramètres. La classification selon l’espèce se fait par étape, chacune faisant appel à une procédure d’analyse factorielle discriminante....
Sludge characterization by image analysis
Motta, Maurício da; Amaral, A. L.; Ho, D.; Pons, M. N.; Vivier, H.; Roche, N.; Ferreira, E. C.In wastewater treatment plants by activated sludge, a complex ecosystem constituted mainly of bacteria, protozoa and metazoa is degrading the pollution. Bacteria are agglomerated as flocs, exopolymers helping to bind zoogleal bacteria to filamentous bacteria which constitute the backbone of the flocs. When a good equilibrium is not maintained between these two bacterial groups, problems occur such as pin-floc (...
Study of Protozoa population in wastewater treatment plants by image analysis
Motta, Maurício da; Pons, M. N.; Vivier, H.; Amaral, A. L.; Ferreira, E. C.; Roche, N.; Mota, M.Protozoa are important microorganisms taking part to the ecosystem balance in wastewater treatment plants. A procedure for their semi-automated identification and counting based on image analysis is proposed. The main difficulty is the segmentation of the protozoa as most of them are in contact with the sludge. The protozoa are characterized by the size of their silhouette (area and length) and three shape fact...
Study of protozoa population in wastewater treatment plants by image analysis
Motta, Maurício da; Pons, M. N.; Vivier, H.; Amaral, A. L.; Ferreira, E. C.; Roche, N.; Mota, M.Protozoa are important micro-organisms taking part to the ecosystem balance in wastewater treatment plants. A procedure for their semi-automated identification and counting based on image analysis is proposed. The main difficulty is the segmentation of the protozoa as most of them are in contact with the sludge. The protozoa are characterized by the size of their silhouette (area and length) and three shape fac...
Automated monitoring of activated sludge using image analysis
Motta, Maurício da; Pons, M. N.; Roche, N.; Amaral, A. L.; Ferreira, E. C.; Alves, M. M.; Mota, M.; Vivier, H.An automated procedure for the characterisation by image analysis of the morphology of activated sludge has been used to monitor in a systematic manner the biomass in wastewater treatment plants. Over a period of one year, variations in terms mainly of the fractal dimension of flocs and of the amount of filamentous bacteria could be related to rain events affecting the plant influent flow rate and composition.
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