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Publicação
Chlorella sp. coagulation‐flocculation by inducing a modification on the pH broth medium
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Orientador(es)
Resumo(s)
Harvesting algae from the culture medium is a major area of R&D as it is one of the greater obstacles for marketing microalgal oil for biodiesel production at competitive
costs when compared to vegetable oils.
Former investigations of large scale algae
harvesting especially examine the removal of
freshwater algal populations from wastewater
treatment processes using metal salts like
ferric chloride or aluminum sulfate were used.These are effective coagulation-flocculation agents, but, besides of being
expensive, their application can be unacceptable if the oil will be used for biodiesel production and the biomass for animal feeding, since the contamination of such products with metals will occur.
Indeed, methods based on autoflocculation,
biofloculation or even new technologies like
electrolytic flotation are promising and could be of very low cost. However, for the moment they require very specific situations and provide significant operating limitations. Chlorella characteristics shown
to impact on aggregation and flocculation
like size, surface functional groups and surface charge were analyzed. Effectiveness
of microalgae flocculation by pH manipulation
and ionic strength effects were investigated
using the Jar-test procedure. A relationship
between cell surface at different incubation
stages and negative zeta potential for a wide
range of pH was checked and it was found that
algae removal was not significantly affected by ionic strength.
Descrição
Dissertação apresentada à Faculdade de Ciências e Tecnologia da Universidade Nova de
Lisboa para a obtenção do grau de Mestre em
Bioenergia
Palavras-chave
Chlorella Biodiesel Harvesting Zeta potential Jar‐testing Autoflocculation