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Advisor(s)
Abstract(s)
Most cassava processing industry
generates a large volume of wastewater effluent
with high contaminating load of COD and BOD
and cyanide concentration, posing to a serious
threat to the environment. A variety of processes
has been tested to treat this wastewater effluent,
where the effectiveness in reducing the toxicity
varies greatly. Microalgae are photosynthetic
microorganisms that can rapidly generate
biomass from solar energy, CO2 and nutrients
in water, namely those present in wastewater
effluents. Also, algal biomass and algae-derived
compounds are potentially useful in industrial
applications, as well as for biodiesel production.
Taking this into account, the aim of this work
was evaluated the ability of Chlorella vulgaris to growth on cassava-processing effluent and
assess the bioremediation potential by evaluating
toxicity of effluent. Batch cultures, with C. vulgaris
in suspended and in immobilized-cell systems,
under different dilutions (20-50%) of cassava
effluent were tested. The effectiveness of the
process has been assessed by phytotoxicity, in
germination trials of Lactuca sativa. Best results
were obtained with C. vulgaris in immobilizedsystems
and carried out with higher initial cell
concentrations. Regarding the phytotoxicity, after
biotreatment we can conclude that microalgae
can reduce the toxicity of cassava effluent,
leading to Germination Increase index (GI) range
of 88-100%.
Description
Keywords
Cassava wastewaters Bioremediation Chlorella vulgaris Phytotoxicity Lactuca sativa
Pedagogical Context
Citation
Medeiros, Verónica de; Loures, Carla Cristina Almeida; Fernandes, Conceição (2022). Potencial de biorremediação de Chlorella vulgaris (Chlorophyceae) em águas residuais do processamento da mandioca. In Engenharia química: Desenvolvimento de novos processos e produtos. [S.l]: Atena Editora. Cap. 9, p. 106-111. ISBN 978-65-258-0198-8