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The study of glycerol-based fermentation and broth downstream by nanofiltration

100%
Gryta M., Markowska-Szczupak A., Grzechulska-Damszel J., Bastrzyk J., Waszak M.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 4
117-122
EN
In this work, the glycerol fermentation was carried out using Citrobacter freundii bacteria. The influence of glycerol and metabolites concentrations, and the pH changes on the efficiency of 1,3-propanediol production, during batch and fed-batch processes, was presented. The nanofiltration was used for the separation of obtained post-fermentation solutions. The resulted 1,3-PD solutions were significantly desalted, which may facilitate further downstream processes during 1,3-PD production.
2
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The oily wastewater treatment using the nanofiltration process

100%
Orecki A., Tomaszewska M.
Polish Journal of Chemical Technology
|
2007
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vol. 9
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issue 4
40-42
EN
The objective of this work was to investigate the possibility of oily wastewater treatment using the nanofiltration (NF) process. The NF studies were carried out with a permeate obtained from ultrafiltration (UF) (used for the treatment of the oily wastewater from metal industry). The influence of transmembrane pressure on a permeate flux, the degree of the rejection of oil and inorganic compounds was investigated. The studies on the NF treatment of oily wastewater demonstrated a high effectiveness of the rejection of oil and inorganic compounds. The permeate obtained from the treatment was free of oil. Moreover, the retention coefficient of the inorganic compounds was higher than 75% for all the cations examined (Na+, K+, Mg2+, Ca2+, Zn2+, Cu2+) and higher than 95% for sulphates. Therefore, the permeate obtained in the NF process can be reused for fresh emulsion preparation.
3
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Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

88%
Gryta M., Bastrzyk J., Lech D.
Polish Journal of Chemical Technology
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2012
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vol. 14
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issue 3
97-104
EN
In this work the studies were performed on the intensity of fouling of the membrane NF90 and NF270 depending on the value of dynamic contact angle, previously determined for these membrane. The NF membranes were used for the separation of broth obtained during the fermentation of glycerol by Lactobacilluscasei bacteria. The measurements of dynamic contact angle were carried out using the Wilhelmy plate method. Taped membranes samples (support layer to support layer), wetted for 2 days in deionized water prior to testing, were used to study the contact angle of top layer and its organic fouling. Using deionized water; the contact angle values equal to 27-30o and 53-57o for NF270 and NF90, respectively, were obtained. As a consequence of adsorption of organic compound on the membrane surfaces, the contact angle obtained for both fouled membranes was about 55-56o, and this value was closer to the contact angle of non-fouled NF90 membrane. Therefore, the NF90 membrane was more resistant to organic fouling during the separation of broth.
4
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Separation and Concentration of Succinic Adic from Multicomponent Aqueous Solutions by Nanofiltration Technique

88%
Antczak J., Regiec J., Prochaska K.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 2
1-4
EN
This paper applies the determined suitability of nanofiltration (NF) membrane separation for selective isolation and concentration of succinic acid from aqueous solutions which are post-fermentation multicomponent fluids. The study analyzed the influence of concentration and the pH of the separated solutions on the efficiency and selectivity of NF process that runs in a module equipped with a ceramic membrane. Moreover, the effect of applied trans-membrane pressure on the retention of succinic acid and sodium succinate has been studied. The investigations have shown that in the used NF module the retention of succinic acid salt is equal almost 50% in the case of a three-component model solution, although the degree of retention depends on both the transmembrane pressure and the initial concentration of separated salt.
5
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Nanofiltration usage for fluoride removal in the sodium chloride presence

88%
Grzegorzek M., Grzegorzek M.
Archives of Environmental Protection
|
2021
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vol. 47
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issue 4
6
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Application of nanofiltration in the process of the separation of model fermentation broths components

75%
Staszak K., Woźniak M. J., Karaś Z., Staniewski J., Prochaska K.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 4
1-4
EN
The effectiveness of nanofiltration with the use of ceramic membranes in the process of concentration and separation of fumaric acid or succinic acid from glycerol and citric acid from erythritol was evaluated. It was found that the retention of sodium salts of the acids investigated increased strongly with increasing the pH of the feed solution (depending on the degree of dissociation), while the retention degrees of di- and tricarboxylic acids, erythritol or glycerol were lower than 2%, irrespective of the initial concentration of the solution to be filtered. The results obtained showed that nanofiltration can be considered as one of the purification steps in the process of recovery of salts of organic acids from fermentation broth.
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