Efficient removal of total nitrogen from tannery wastewater by promoting denitrification with sodium acetate / Ma Xiaojian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 323-327 Titre : Efficient removal of total nitrogen from tannery wastewater by promoting denitrification with sodium acetate Type de document : texte imprimé Auteurs : Ma Xiaojian, Auteur ; Zhou Jianfei, Auteur ; Zeng Yunhang, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 323-327 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de sodium Chlorures Dénitrification Eaux usées -- Analyse Eaux usées -- Epuration Eaux usées -- Teneur en azote total Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Total nitrogen (TN) in tannery wastewater is difficult to remove completely, because the low C/N ratio of the wastewater leads to inadequate denitrification. Sodium acetate was used as an extra carbon source to improve the denitrification efficiency and the TN removal. The appropriate COD/TN ratio for denitrification using sodium acetate was 5.1, at which the TN concentration of tannery wastewater decreased by 95%. A much faster removal of TN was obtained by adding sodium acetate in denitrification than by adding common glucose. These results showed that sodium acetate was a high-quality carbon source for a complete and rapid denitrification of tannery wastewater. The denitrification efficiency decreased with decreasing temperature and increasing chloride concentration. However, when the carbon source was made sufficient by adding sodium acetate, complete denitrification was stil) obtained even at 15°C or 10000mg/L of chloride concentration. Note de contenu : - MATERIALS AND METHODS : Materials - Effect of temperature on anaerobic denitrification of wastewater - Effect of chloride concentration on anaerobic denitrification of wastewater - Analytical methods of pollution loads in wastewater - RESULTS AND DISCUSSION : Effect of addition of sodium acetate on anaerobic denitrification of tannery wastewater - Effect of temperature on anaerobic denitrification of tannery wastewater - Effect of chloride concentration on anaerobic denitrification of tannery wastewater En ligne : https://drive.google.com/file/d/1FUylPZ3JvBdPyCNZe4mIZkDmr_wPe0I3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33211 [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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Properties of a new nitrogen-free additive as an alternative to urea and its application in reactive printing / Chenglong Wang in COLORATION TECHNOLOGY, Vol. 138, N° 2 (04/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 2 (04/2022) . - p. 137-145 Titre : Properties of a new nitrogen-free additive as an alternative to urea and its application in reactive printing Type de document : texte imprimé Auteurs : Chenglong Wang, Auteur ; Yongfang Xian, Auteur ; Hongmei Wang, Auteur ; Minghua Wu, Auteur ; Yijia Wang, Auteur ; Deyou yu, Auteur ; Lili Wang, Auteur Année de publication : 2022 Article en page(s) : p. 137-145 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Bleu (couleur) Colorants réactifs Eaux usées -- Teneur en azote ammoniacal Eaux usées -- Teneur en azote total Formulation (Génie chimique) Impression sur étoffes Pâtes d'impression Produits chimiques -- Suppression ou remplacement Sérigraphie Solidité de la couleur Teinture -- Fibres textiles Urée Viscose Index. décimale : 667.3 Teinture et impression des tissus Résumé : The development of a urea substitute with little nitrogen has become a hot research topic for cleaner production in reactive printing. In the current study, a mixture made from glycerol and 1,4-butanediol (1:1, w/w), namely, urea substitute glycerol butanediol (USGB), was used instead of urea in the printing paste formulation. USGB’s abilities of moisture adsorption, swelling fibres and solubilisation to reactive dyes were compared with those of urea. The printing properties of USGB on different fabrics with reactive dyes were intensively investigated in comparison with urea and commercial 391-H. The results showed that USGB’s ability to swell viscose fibres was superior to that of urea. When the dosage of USGB was within 8-10 wt% in the printing paste, the colour yield of USGB on viscose fabrics drew near to that of urea and was higher than that of 391-H. During viscose printing of reactive blue dyes with different shades and structures, the colour performance of USGB was close to that of urea and higher than that of 391-H. Furthermore, USGB could obtain good printing effects in deep printing with Reactive Turquoise K-GL on different fabrics. Compared with urea, the content of ammonia-nitrogen and total nitrogen in the printing wastewater using USGB were greatly reduced, which is of huge significance for lowering ammonia-nitrogen emissions in the printing industry. Note de contenu : - EXPERIMENTAL : Materials - Determination of the hybroscopicity, swellability and solubility of printing additives - Reactive printing pastes - Screen printing technique - Printing performance of the printed fabrics - RESULTS AND DISCUSSION : The hygroscopicity, swellability and solubility of printing additives - Colour performances of printing additives with different dosages in reactive printing - Colour performances of printing additives in different printing pastes - Colour performances of printing additives in viscose printing of different reactive dyes - Table 1 : The formula of reactive printing paste - Table 2 : Hygroscopicity, swellability of viscose fibre ans solubilisation to reactive turquoise K-GL using urea and urea substitute glycerol butanediol (USGB) as printing additives - Table 3 : Colour performances of urea, urea substitue glycerol butanediol (USGB) and 391-H on different fabrics during deep printing with Reactive Turquoise K-GL - Table 4 : Hand parameters of the printed fabrics using urea, urea substitute glycerol butanediol (USGB) and 391-H as printing additives during deep printing with Reactive Turquoise K-GL - Table 5 : Colour fastness of the printed fabrics using urea, urea substitute glycerol butanediol (USGB) and 391-H as printing additives during deep printing with Reactive Turquoise K-GL - Table 6 : Ammonia-nitrogen and total nitrogen content in reactive printing wastewater DOI : https://doi.org/10.1111/cote.12576 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12576 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37844 [article]

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