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Biogas production and purification using membrane processes
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In this master thesis, a single-stage anaerobic co-digestion system was operated treating a mixture
of leachate and tannery wastewater, increasing salinity from 5 to 15 g Na+ L-1.
Biogas production (1.6 ± 0.3 – 3.0 ± 0.3 L d-1) increased as salinity increased up to 10 g Na+ L-1
as well as CH4 yield (0.29 ± 0.03 – 0.33 ± 0.03 L CH4 g-1 COD). At 15 g Na+ L-1, a decrease in biogas
production and granules fragmentation were observed. Overall, the results showed that the microbial
community was able to withstand salinities up to 15 g Na+ L-1, presenting a good performance on the
co-treatment of leachate and tannery wastewater.
The second part of this master thesis was focused on the effect of combining metal organic
frameworks (MOF-5), with high adsorption properties towards CO2 when compared with CH4, with a
combination of different poly(ionic liquid)/ionic liquid (PIL/IL) membranes for biogas upgrading. The
MOF-5 was incorporated at different loadings (10, 20 and 30 wt%), and mixed matrix membranes
(MMMs) were prepared by solvent evaporation method. The results showed that MOF-5 particles were
uniformly dispersed into the PIL/IL matrix, except for PIL C(CN)3/40 [C2MIM][C(CN)3]. The prepared
PIL/IL/MOF-5 membranes revealed suitable thermal stability (Tonset up to 300-380ºC) for biogas
upgrading, but a loss of mechanical stability was found after the incorporation of MOF-5. Nevertheless,
increasing MOF-5 content in the MMMs resulted in an improvement on CO2 permeability, which
increased 133% for PIL Tf2N/40 [C2MIM][BETi]/30 MOF-5 when compared to PIL Tf2N/40
[C2MIM][BETi]. It was therefore possible to demonstrate the improvement of CO2/CH4 separation
performance of this MMMs system using MOF-5, which opens the perspective of using these materials
for biogas upgrading.
Descrição
Palavras-chave
single-stage anaerobic co-digestion system biogas salinity biogas upgrading mixed matrix membranes metal organic frameworks