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Culture conditions optimisation of bacillus subtilis for producing bioflocculant / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)
[article]
Titre : Culture conditions optimisation of bacillus subtilis for producing bioflocculant Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Zhang Yizhuo, Auteur ; Yang Qinhuan, Auteur ; Yang Yang, Auteur Année de publication : 2020 Article en page(s) : p. 151-155 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bacillus subtilis
Bactéries -- Culture et milieux de culture
Biofloculant
Eaux usées -- Décontamination
Eaux usées -- EpurationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A bioflocculant seen as an environmentally friendly flocculant with potential for development, with the capacity to improve its activity and yield has become a hot topic of research among scholars in various countries. This study found that a bioflocculant produced by Bacillus subtils is able to treat leather wastewater, but the flocculation activity of the bioflocculant needs to be improved. In this paper, the culture conditions of Bacillus subtilis were optimised by single-factor and orthogonal tests. The results showed that the bioflocculant produced by Bacillus subtilis through optimising the culture conditions had good flocculation efficiency. The optimal culture temperature after optimisation was 36°C, the inoculum dose was 5% (v/v), at pH7.5, the culture time was 48 hours, the flocculation efficiency increased from 46.12% to 73.71%, an increase of 59.82%, and the production of flocculant increased from 0.45g/L to 0.61g/L, an increase of 35.56%. Through optimising the culture conditiops of Bacillus subtilis the flocculation efficiency of the bioflocculant, was improved and both the cost of flocculation and secondary pollution were reduced. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Activation of Bacillus subtilis species - Initial culture of Bacillus subtilis - Collection of bioflocculant
- SINGLE FACTOR OPTIMISATION OF CULTURE CONDITIONS : Determination of culture temperature - Determination of inoculum dose - Determination of culture pH - Determination of culture time
- ORTHOGONAL OPTIMISATION OF CULTURE CONDITIONS
- RESULTS AND DISCUSSION : Effect of culture temperature - Determination of optimum inoculum dose - Determination of optimal pH - Determination of optimum culture time - Orthogonal test of culture conditions - Comparison of effects before and after optimisation of culture conditionsEn ligne : https://drive.google.com/file/d/1ypFkJYJntpsnfPxiGliF-VWD9zQ9BMcj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34245
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 3 (05-06/2020) . - p. 151-155[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21767 - Périodique Bibliothèque principale Documentaires Disponible Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt / Chao Lv in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt Type de document : texte imprimé Auteurs : Chao Lv, Auteur ; Ruiqing Shen, Auteur ; Yang Yang, Auteur ; Rui Shu, Auteur ; Guodong Li, Auteur ; Jingxian Liu, Auteur Année de publication : 2023 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Feutre (textiles et tissus)
Filtration
Matériaux -- Imprégnation
Matériaux aiguilletés
Polytétrafluoréthylène
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polytetrafluoroethylene (PTFE) emulsion is widely used as a coating material in the impregnation process for preparing polyphenylene sulfide (PPS) needle felts due to its excellent chemical stability and good mechanical properties. However, the effect of emulsion impregnation coating on the filtration performance of needle felts is still under debate. Moreover, in industrial applications with high temperatures, the service life of needle felts is directly affected by their thermal stability, but the pyrolysis and kinetic properties of PPS needle felt after PTFE emulsion impregnation post-processing have rarely been quantitatively investigated. In this study, the PPS fiber/PTFE emulsion (PPS/PTFE) composite needle felt was fabricated by a direct impregnation process. The pressure drop characteristic and mechanical collection efficiency of PPS needle felt and PPS/PTFE composite needle felt were comprehensively evaluated. It was found that the PTFE emulsion impregnation coating not only increases the pressure drop, but also decreases the collection efficiency. More specifically, for particles having a size below 2.5 μm, the decrement of collection efficiency further increases with the decrease of particle size, but the mechanical collection efficiency of PPS/PTFE composite needle felt for particles having larger size is almost the same as that of PPS needle felt. Three emulsion impregnation coating distribution models were inferred to systematically explain this experimental phenomenon. Additionally, the thermal degradation process of PPS needle felt and PPS/PTFE composite needle felt was analyzed, and several typical pyrolysis kinetic parameters were also determined theoretically. It was confirmed that the PTFE emulsion impregnation coatings can enhance the thermal stability of PPS needle felts. This work provides new insight into the rational application of the direct impregnation process as well as emulsion impregnation coating in the industrial filtration field. Note de contenu : - MATERIALS AND METHODS :
- Materials
- Preparation of PPS/PTFE composite needle felt
- Characterizations
- RESULTS AND DISCUSSION :
- Pressure drop characteristics and mechanical collection efficiency
- Thermal degradation process and reaction kinetics
- Table 1 : Information of experimental materialsDOI : https://doi.org/10.1007/s11998-022-00755-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00755-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39726
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible A novel adsorption method to simulate the dirt pickup performance of organic coatings / Shuxue Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)
[article]
Titre : A novel adsorption method to simulate the dirt pickup performance of organic coatings Type de document : texte imprimé Auteurs : Shuxue Zhou, Auteur ; Yang Yang, Auteur ; Tao Wang, Auteur ; Hongyu Chen, Auteur ; James Bohling, Auteur ; Alvin M. Maurice, Auteur ; Limin Wu, Auteur Année de publication : 2018 Article en page(s) : p. 175-184 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Cendres
Cendres de riz et constituants
Essais (technologie)
Méthyltriméthoxysilane
Résistance à la salissure
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The evaluation of the dirt resistance of organic coatings according to traditional accelerated methods (e.g., the standard method GB/T 9780-2013 in China) usually provides results which deviate from their real-world performance in seriously polluted environments. As an alternative, a novel adsorption method with methyltrimethoxysilane-modified rice-straw ash as the artificial dirt standard was proposed in this paper. With this method, the ash was dispersed into the air in a testing chamber and then allowed to physically adsorb to the coating, which is believed to more accurately simulate the adsorption behavior of floating particulates outdoors. Two groups of latex coatings from Dow Chemical Company were employed to evaluate the adsorption method by monitoring the changes in color, whiteness, and reflectivity. In parallel, outdoor exposure testing of these coatings was conducted. The influences of charging method, of ash type, and panel position on the testing results were carefully investigated. Multicharging of ash (9 g × 3) and parallel panels at different positions in the testing chamber are designed for the generation of repeatable results. It was demonstrated that the adsorption method basically matched the outdoor exposure results and was more predictive of real-world results than GB/T 9780-2013. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of standard dirt - Testing apparatus and method - Outdoor exposure testing - Characterization
- RESULTS AND DISCUSSION : Preparation of standard dirt - Influence of the type of dirt - Influence of charging method of ash - Influence of testing panel position - Examination of the repeatibility of adsorption method - The feasibility of adsorption methodDOI : 10.1007/s11998-017-9971-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9971-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30110
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Code-barres Cote Support Localisation Section Disponibilité 19610 - Périodique Bibliothèque principale Documentaires Disponible