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]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 3 (05-06/2020) . - p. 151-155 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 -- Epuration Index. 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 conditions En ligne : https://drive.google.com/file/d/1ypFkJYJntpsnfPxiGliF-VWD9zQ9BMcj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34245 [article]

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Optimisation for preparation conditions of modified bioflocculant based on the tannery wastewater treatment / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 112-116 Titre : Optimisation for preparation conditions of modified bioflocculant based on the tannery wastewater treatment Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Guangyu Ran, Auteur ; Yang Zhao, Auteur ; Yang Qinhuan, Auteur ; Chunyu Fang, Auteur Année de publication : 2022 Article en page(s) : p. 112-116 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Biofloculant Eaux usées -- Analyse Eaux usées -- Epuration Eaux usées -- Recyclage Eaux usées -- Teneur en azote total Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery wastewater with high content of total nitrogen is a liquid leather waste with a serious impact on the environment. Herein, the removal of total nitrogen from tannery wastewater has attracted increasing attention among scientists in the leather industry. In this paper, a kind of novel modified bioflocculant was prepared based on the optimisation index of the total nitrogen removal rate of tannery wastewater. Specifically, the novel modified bioflocculant (type N6616) was prepared by modifying Bacillus cereus with amphoteric starch using ammonium cerium nitrate as initiator. Then, the single-factor and orthogonal optimisation experiments were carried out to optimise the modified conditions. The results showed that the highest removal rate could reach 77.53% under the condition of the amphoteric starch dosage of 0.35g/L, the bioflocculant dosage of 3g/L, the initiator dosage (0.02mol/L) of 1.75mL, the reaction temperature of 40°C, the reaction time (second stage) of 18 minutes, the rotation speed of 270r/min and the pH of reaction system of 5.0. This paper provides an effective bioflocculant to remove the total nitrogen of tannery wastewater and mitigates the bad effect of tannery wastewater on the environment. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Optimisation experiment for modified conditions of bioflocculant - RESULTS AND DISCUSSION : Single-factor optimisation of modified conditions - Orthogonal optimisation of modified conditions - Table 1 : Details of the orthogonal design for the N6616 modified procedure of bioflocculant - Table 2 : Experimental design and results of N6616 modified bioflocculant - Table 3 : Variance analysis of N6616 type modified bioflocculant En ligne : https://drive.google.com/file/d/1D3lxh34Gne5rG66R0tmByCP49GVrzCeN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37754 [article]

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Optimisation of cationic starch modified bioflocculant for the removal of total nitrogen from tannery wastewater / Guangyu Ran in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 4 (07-08/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 4 (07-08/2023) . - p. 158-163 Titre : Optimisation of cationic starch modified bioflocculant for the removal of total nitrogen from tannery wastewater Type de document : texte imprimé Auteurs : Guangyu Ran, Auteur ; Zihan Zhao, Auteur ; Jinpin Dai, Auteur ; Jinwei Hu, Auteur ; Peng Yang, Auteur ; Huilin He, Auteur ; Changqing Zhao, Auteur Année de publication : 2023 Article en page(s) : p. 158-163 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amidon cationique Biofloculant Eau -- Épuration -- Élimination des composés organiques Eaux usées -- Epuration Eaux usées -- Teneur en azote total Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery wastewater contains a high concentration of total nitrogen, and its direct discharge will lead to eutrophication of water bodies, thus the treatment of total nitrogen in tannery wastewater has become the focus of environmental protection. In this paper, total nitrogen removal rate in tannery wastewater was investigated as an index, and sm-A3 cationic starch was used as an initiator to optimise the modification process of flocculant produced by Bacillus cereus CZ1001. In the modification optimisation process, single-factor optimisation experiments and orthogonal optimisation experiments were conducted on the dosage of cationic starch, bioflocculant, initiator, reaction time, reaction temperature, pH and rotational speed of the reaction system. The results showed that with cationic starch (2mL) 0.3 g/L, bioflocculant (25mL) 4.5g/L, initiator (0.02mol/L) dosage 2mL, reaction time in the first stage 7.5min, reaction temperature 55°C and the reaction system pH7.0, the highest total nitrogen removal rate of 89.22% was achieved for the tannery wastewater, and finally, we produced a cationic starch modified bioflocculant with high nitrogen removal rate. This research result reduced the environmental impact of tannery wastewater and broadened the treatment pathway of tannery wastewater. Note de contenu : - EXPERIMENTAL PROCEDURE : Material and method - RESULTS AND DISCUSSION : Single-factor optimisation of modified conditions - Orthogonal optimisation of modified conditions - Table 1 : ANOVA test for second stage reaction time - Table 2 : Factor level table for preparation of cationic starch modified bioflocculant - Table 3 : Experimental design and range analysis of cationic starch modified bioflocculant - Table 4 : Analysis of variance for cationic starch modified bioflocculants En ligne : https://drive.google.com/file/d/1Ukunt4ZZUNREcNbMjL24hIny7DOLMTkU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39690 [article]

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Preparation and optimisation of a novel modified bioflocculant for removal of nitrogen in tannery wastewater in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 1 (01-02/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 1 (01-02/2022) . - p. 1-6 Titre : Preparation and optimisation of a novel modified bioflocculant for removal of nitrogen in tannery wastewater Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 1-6 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biofloculant Cuirs et peaux -- Industrie -- Aspect de l'environnement Eau -- Épuration -- Élimination des composés organiques Eaux usées -- Epuration Eaux usées -- Teneur en azote total Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, a modified bioflocculant was successfully prepared involving HM-636 amphoteric starch measuring the effect of the removal of total nitrogen from tannery wastewater as its optimisation index. Specifically, the effects of the modified bioflocculant on the removal of total nitrogen from tannery wastewater were investigated by the single-factor optimisation experiment and orthogonal optimization experiment, and the conclusions obtained were that the optimum factors were: amphoteric starch 0.2g/L, bioflocculant 3.5g/L, initiator (0.02mol/L) 2.5mL, reaction time of the second stage 28 minutes, rotation speed of mixing 270r/min, reaction temperature 35°C, and reaction system pH5.0. The total nitrogen removal rate of 79.81% could be obtained under these optimal reaction conditions. In other words, the modified bioflocculant has an improved effect on the removal of total nitrogen. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Preparation of seed solution - Preparation of bioflocculant - Preparation of modified bioflocculant - Preparation of simulated tannery wastewater - The removal of total nitrogen from tannery wastewater - RESULTS AND DISCUSSION : Single-factor optimisation - The orthogonal optimisation - Table 1 : Factor level table for preparation of HM-636 modified bioflocculant - Table 2 : Experimental design and range analysis of modified bioflocculant - Table 3 : Variance anlaysis of HM-636 modified bioflocculant En ligne : https://drive.google.com/file/d/1niVbC7EEr59iygXSHwBiXztIud9j7LDr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36967 [article]

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