Full text
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| Author(s): |
Lauris Del Carmen Mejia da Silva
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2014-11-11 |
| Examining board members: |
Joao Carlos Monteiro de Carvalho;
Marina Ishii;
André Moreni Lopes
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| Advisor: | Joao Carlos Monteiro de Carvalho |
| Abstract | |
The cyanobacterium Arthrospira (Spirulina) platensis, one of the most studied and cultivated photosynthetic microorganisms and, currently has been used for biomass production of biomass, with high contents of protein, vitamins, minerals, amino acids, polyunsaturated fatty acids, and pigments, with potential use as a dietary supplement for human food supplement and animal feed. However, the cultivation of photosynthetic microorganisms have a very high water demand. Thus, is important to carry out studies evaluating the possibility of reuse of Arthrospira culture medium, which, in addition to reducing the costs of nutrients, include the environmental aspect, preventing soil salinization and eutrophication of water bodies. This work has evaluated the reuse of effluent medium from Arthrospira (Spirulina) platensis cultivation treated with powdered activated carbon and different coagulants. The effluent, obtained from A. platensis batch cultivation in bench-scale open ponds, using sodium nitrate as a nitrogen source. The effluent went through physico-chemical treatments employing different concentrations of powdered activated carbon (30, 40, and 50 mg.L-1) and ferric chloride (6, 10, and 14 mg.L-1) or ferric sulphate (15, 25, and 35 mg.L-1) for them to be reused in cultured microorganism. The reuse through the cultivation of A. platensis showed acceptable results, observing that the growth of this cyanobacterium was satisfactory, obtaining maximum cell concentration (Xm) obtained 1093 mg.L-1 in Erlenmeyer flask, corresponding to the assay medium treated with 30 mg.L-1 of powdered activated carbon (PAC) and 6 mg.L-1 ferric chloride. The results of cell growth were the same order of magnitude as the results of Xm obtained with new culture medium and larger than those from growth in media treated with ferric sulfate as a coagulant agent, whose maximum values of cell concentration did not exceed 806 mg.L-1. The cultures in media from treatment with ferric chloride did not alter the composition of the biomass, reaching values of protein content of around 47%. It is concluded that the reuse of cultures medium may be feasible to produce biomass of A. platensis, reducing the production cost by recycling of nutrients. (AU) | |
| FAPESP's process: | 12/08883-6 - Reuse of exhausted medium from Arthrospira (Spirulina) platensis after treatment with powdered activated carbon and different coagulants. |
| Grantee: | Lauris Del Carmen Mejia da Silva |
| Support Opportunities: | Scholarships in Brazil - Master |