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| Author(s): |
Samir Prioto Tayar
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Araraquara. 2018-04-10. |
| Institution: | Universidade Estadual Paulista (Unesp). Instituto de Química. Araraquara |
| Defense date: | 2018-03-09 |
| Advisor: | Denise Bevilaqua |
| Abstract | |
The sulfur cycle in nature is directly related to life and which makes its equilibrium very important, bringing the need of treatments of solid, liquid or gaseous industrial wastes containing this element. This work present the study of bioreactors aiming to treat liquid and gaseous residues containing the sulfur element by the sulfate reducing and sulfide oxidizing processes. The reductive bioprocess study was carried out using central composite experimental design to optimize the sulfide production and sulfate elimination from wastewaters, through the optimization of retention time, initial sulfate concentration and DQO/sulfate ratio in Fixed-bed continuous bioreactors. The results of these experiments showed that higher daily sulfide production occurs in 15 hours of retention time with the DQO/sulfate ratio of 2.0 and initial sulfate concentration bigger than 3000 mg L-1. Higher sulfate elimination percentage was obtained with retention time of 25-35 hours with initial sulfate concentration lower than 1000 mg L-1. And the highest sulfate amount eliminated daily was obtained in 25 hour of retention time and 2250 mg L-1 of initial sulfate concentration. The bioprocess for H2S oxidation using biotrickling filter containing PVC stripes as an alternative support material was able to treat the biogas of the Matão sewage treatment plant. With retention time of 4.8, 2.4 and 1.6 minutes, the sulfide elimination percentage was 60,06 ± 13,81%, 71,89 ± 14,33 % e 89,83 ± 14,97% respectively. The optimum temperature range determined for this process was 35,3-36,7 ºC and the biogas measures in different heights of the bioreactor showed that the H2S was almost totally removed in the beginning of the process, showing that the system may be able to treat higher load of this contaminant. (AU) | |
| FAPESP's process: | 16/01299-8 - Coupled bioprocess to treat acid mine drainage and decontamination of biogas to elemental sulfur production in bench scale |
| Grantee: | Samir Prioto Tayar |
| Support Opportunities: | Scholarships in Brazil - Master |