Banca de QUALIFICAÇÃO: ELAINE CRISTINA RODRIGUES DO NASCIMENTO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ELAINE CRISTINA RODRIGUES DO NASCIMENTO
DATA : 27/09/2018
HORA: 11:00
LOCAL: Sala de Reuniões, CB
TÍTULO:

FLOCCULATION OF MICROALGAE WITH NATURAL AGENTS AND STUDENT KNOWLEDGE - BIOFUELS AREA - ON THE THEME

PALAVRAS-CHAVES:

Biomass, Sustainability, Knowledge

PÁGINAS: 42
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Given the current situation, we seek to combine economic growth with environmental protection. The use of living organisms in the fight against degradation, removal of pollutants and generation of income has been growing in recent years. In this context are inserted, for example, microalgae, this general term, without taxonomic value, applies to photosynthetic microorganisms eukaryotes or prokaryotes. Because they are versatile, microalgae have been studied because of their ecological, economic and nutritional potential. At the end of the cultivation, the microalgae need to be concentrated and separated from the culture medium, this is a problematic phase that requires high costs, besides being an area that needs to be studied, because there is no universal method for the collection of biomass. Flocculation is one of the separation methods that is inexpensive and simple to use. It consists of the neutralization of the negative charges present on the surface of the microalgae cell through the use of an agent, with the consequent formation of flakes that sediment and are removed of the culture medium. The most used flocculants are those composed of aluminum and iron salts, but these substances are toxic, non-biodegradable and can cause various damages to human health. Alternatives to such compounds may be the natural flocculants or biopolymers which are mainly plant-based materials. They may be cationic, anionic or nonionic, and are generally water soluble. Moringa oleifera and Cereus jamacaru are examples of natural flocculants, as well as tolerance in semi-arid regions. Therefore, microalgae could be an alternative to the Brazilian semi-arid regions, because they use effluent water, this same water can be used in successive crops, grow adequately in the levels of luminosity and temperature provided in these regions and at the end of the crop flocculants could also be from semi-arid regions. Therefore, it is also necessary that microalgae be seen in this way. In the municipality of Apodi, for example, each year the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN) opens a class for the technical course on Biofuels. In addition to the already widespread crops such as soybean, corn and sugar cane, it is important that these future professionals also visualize microalgae as a promising crop for this region. Thus, the objectives of this work are to evaluate the efficiency of flocculation of microalgae under the effect of the type and concentration of flocculants, ph and microalgae species, as well as to analyze the knowledge of students of the Technical Course of Medium Level in Biofuels of the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN) at the Apodi / RN campus on microalgae and its focus on the energy sector. For this, the microalgae were cultivated in raceways at the Aquaculture Technology Center, located in the municipality of Extremoz / RN, with medium BG11, photoperiod 12:12 h (light / dark) and lightness of approximately 1164 lx. For the flocculation assays the Cereus jamacaru powder and the Moringa oleifera solution were used. The flocculation and coagulation tests are performed in jar test, in which 500 ml of microalgae are added in each jar. The treatments are: 0.5 g/L, 1 g/L, 2 g/L, 4 g/L for Cereus jamacaru, and for Moringa oleifera, 0.2 g/L, 0.5 g/L, 0.8 g/L, 1 g/L, 2 g/L plus a control with microalgae alone. All tests happen in triplicates. For each concentration the pH is varied in the values of 5, 7 and 9. The cultures are shaken at 200 rpm for 10 minutes. Then the equipment is switched off, the samples rest for 60 min, and then 20 ml aliquots are taken to check the flocculation efficiency. The measurement is done by means of spectrophotometer analysis, through the optical density readings of sample (A), sample blank (B), control (C) and water (D). To evaluate the knowledge of IFRN students on microalgae, questionnaires with semi-structured questions were applied to 86 students. From the analysis of the data, it was verified that 44% of the students heard about microalgae, but presented superficial knowledge on the subject. It was concluded that it would be important for this topic to be addressed in the initial disciplines as well as the culture of other energy plant matrices and that students need to broaden their knowledge about the full range of products and benefits that microalgae can generate in addition to biodiesel.

MEMBROS DA BANCA:
Interno - 1221519 - DÁRLIO INÁCIO ALVES TEIXEIRA
Interno - 2218942 - IVANEIDE ALVES SOARES DA COSTA
Externo ao Programa - 347010 - ROSANGELA GONDIM D OLIVEIRA