Fitorremediação de efluentes urbano e piscícola utilizando a microalga Chlorella vulgaris e adição de sua biomassa seca na dieta do camarão marinho litopenaeus vannamei

• Ano de defesa: 2022
• Autor(a) principal: Lopes, Dilliani Naiane Mascena
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Camarão marinho; Qualidade da água; Remoção de nutrientes
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/65854

Phytoremediation, with the use of microalgae, is a technique used in the treatment of different types of effluents, aiming at the removal of compounds that can cause eutrophication, such as nitrogen and phosphate. The present study evaluated the phytoremediation of urban and farm fish effluents using the microalgae Chlorella vulgaris and the addition of its biomass in the diet of the marine shrimp Litopenaeus vannamei. The microalgae were cultivated in three treatments (effluent from the sewage treatment plant, aquaculture effluent and standard medium Guillard f/2), conducted in quintuplicate for each culture medium, using a carboy of 20 L for 8 days. The experiment with shrimp was realized with three treatments in quintuplicate, in a completely randomized design, for 15 days. The animals were kept in aquariums of 100 L under constant aeration, fed four times a day (8:00, 11:00, 14:00 and 16:00 h) offering commercial ration with 35% of crude protein, commercial ration plus addition of 5% dry biomass of C. vulgaris cultiveted in effluent from a treatment plant and commercial feed plus addition of 5% of dry biomass of C. vulgaris cultivetd in aquaculture effluent, respectively. The efficiency of C. vulgaris in the phytoremediation of aquaculture effluent and treated effluent was 80.7 and 75.7%, respectively. The nitrite was completely removed in the 3 treatments and the nitrate had a bioremoval of 95.1; 92.0 and 98.6% for cultivation in Aquaculture Effluent, Treated Effluent and Standard Medium, respectively. Phosphorus was completely absorbed in cultures with Aquaculture Effluent and Standard Medium, with 67.7% removal in cultures with Treated Effluent. The productive results of the microalgae cultivated in Aquaculture Eluent were similar to the performance of the cultivation in Standard Medium, demonstrating the potential of cultivation in wastewater. The additive with the best zootechnical performance was the commercial ration plus the addition of 5% of dry biomass of C. vulgaris cultivated in aquaculture effluent.