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Auteur Yunhang Zeng
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- Sichuan University - Chengdu - China
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Ammonia nitrogen in tannery wastewater : distribution, origin and prevention / Yanan Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)
[article]
Titre : Ammonia nitrogen in tannery wastewater : distribution, origin and prevention Type de document : texte imprimé Auteurs : Yanan Wang, Auteur ; Yunhang Zeng, Auteur ; Xiaowei Chai, Auteur ; Xuepin Liao, Auteur ; Qiang He, Auteur ; Bi Shi, Auteur Année de publication : 2012 Article en page(s) : p. 40-49 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eaux usées -- Analyse
Eaux usées -- Teneur en azote ammoniacal
Travail de rivière (cuir)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tannery wastewater usually contains a high content of ammonia nitrogen (NH3-N), which increases the difficulty of wastewater treatment. The objective of this work is to investigate the distribution of NH3-N in wastewaters from beamhouse processes and analyze the origin of NH3-N in each operation, so that the strategies that can reduce NH3-N at the origin could be suggested. Not surprisingly, the results demonstrate that NH3-N mainly concentrates in deliming and bating wastewaters due to the addition of ammonium salts in these two operations. This problem can be solved by using non-ammonia deliming and bating agents. A small quantity of NH3-N arises from washing and soaking processes because of decomposition of proteins by microorganisms. But the NH3-N in washing and soaking wastewaters may considerably increase when skins are badly preserved or the microorganisms in soaking float are not properly inhibited. Therefore, the effective antibacterial measures are important to diminish the production of NH3-N in beamhouse processes. As for unhairing/liming process, NH3-N in wastewater is mainly originated from hydrolysis of proteins, such as keratin and collagen, by strong alkali. Hair-saving unhairing and pelt swelling under milder conditions favor the decrease of NH3-N discharge. In fact, the amount of organic nitrogen released from washing, soaking and liming processes is much more than NH3-N. The experimental results indicate that the organic nitrogen mainly results from non-collagen proteins and their hydrolysates. This means the discharge of organic nitrogen is difficult to be avoided, and it may constitute a threat to end-of-pipe treatment of NH3-N. Note de contenu : - EXPERIMENTAL : Materials - Determination of NH3-N in beamhouse wastewaters - Determination of NH3- content in leather chemicals - Effect of curing time on NH3-N concentration in washing wastewater - Effect of soaking time on NH3-N concentration in soaking wastewater - Analysis of origin of NH3-N in unhairing/liming wastewater - Effect of reliming time on NH3-N concentration in reliming wastewater - Determination of TN and hydroxyproline in beamhouse wastewaters - Analysis of origin of TN in unhairing/liming wastewater - Analysis of origin of TN in deliming wastewater - Analytical methods : Ammonia nitrogen - Total nitrogen - Hydroxyproline
- RESULTS AND DISCUSSION : Distribution of NH3-N in wastewaters of pig skin beamhouse processes - Distribution of NH3-N in wastewaters of cattle hide beamhouse processes - Origin of NH3-N in initial washing and soaking wastewaters - Origin of NH3-N in unhairing/liming wastewater - Origin of NH3-N in reliming wastewater - Relationship between TN and NH3-N in beamhouse wastewatersEn ligne : https://drive.google.com/file/d/12alRCA2Lr5eBz6sPv3YF4X4vui_ZBxhV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13569
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 2 (02/2012) . - p. 40-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13693 - Périodique Bibliothèque principale Documentaires Disponible 13824 - Périodique Bibliothèque principale Documentaires Disponible A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
[article]
Titre : A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture Type de document : texte imprimé Auteurs : Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Ying Song, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 19-25 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux
Cuirs et peaux -- Analyse
Décapage
Gluconate de sodiumLe gluconate de sodium est un composé organique de formule brute Na1C6H11O7. C'est un sel sodique de l'acide gluconique.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ammonium salts used in deliming process are the main source of high ammonia nitrogen (NH3-N) concentration in tannery wastewater. To reduce nitrogen pollution in leather manufacture without sacrificing quality of resultant leathers, a cleaner deliming agent prepared by mixing sodium gluconate (60 wt.%), citric acid (15 wt.%) and ammonium sulfate (25 wt.%) together was employed for deliming limed cattle hide pelt. The results indicated that this cleaner deliming agent penetrated the whole pelt very quickly and successfully formed a buffer system of pH 8-9 with the alkali from liming, which prevented acid swelling and damage to the fiber network of pelt. The delimed pelt had a cleaner grain surface with a higher extent of calcium removal than the conventional ammonium delimed pelt. The concentrations of NH3-N and total nitrogen (TN) in the cleaner deliming effluent were dramatically reduced by 86% and 79%, respectively. Moreover, the cleaner deliming scarcely affected subsequent bating process with trypsin. Note de contenu : - EXPERIMENTAL : Materials - Experimental and control deliming and bating processes - Analyses of penetration of deliming agents - Determination of deliming float pH - Determination of concentration of hydroxyproline (Hyp) in deliming effluent - SEM and EDS analyses of delimed pelt - Determination of concentrations of NH3-N, TN, TOC, COD and BOD5 in deliming effluent - Determination of concentrations of protein and Hyp in bating effluent - Observation of mass transfer of trypsin in bated pelt
- RESULTS AND DISCUSSION : Penetration and pH buffering capacity of deliming agent - Extent of calcium removal from pelt - Effect of deliming on bating - Environmental benefitsEn ligne : https://drive.google.com/file/d/15pYiNAZ3f0fxj-aCNZveRUGAmKAQ-gNM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29748
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 19-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19487 - Périodique Bibliothèque principale Documentaires Disponible A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans / Qingyong Sun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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Titre : A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans Type de document : texte imprimé Auteurs : Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Yue Yu, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés aromatiques
Dynamique moléculaire
Pénétration (physique)
Précipitation (chimie)
Retannage
Simulation, Méthode de
Sulfonation
Syntans
Tannage synthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It is well-known that the sulfonation degree (DS) of aromatic syntan is an important factor affecting its retanning performances. But the quantitative relation between DS and syntan property and the influencing mechanism of DS on syntan property are not clarified. In this work, five phenolic formaldehyde syntans (PFSs) with the same polymerization degree but varying DS were prepared to investigate the effect of DS on the properties of syntan and crust leather. It was found that the absolute value of zeta potential and the particle size of PFS decreased with increasing DS in aqueous solution. Molecular dynamic simulation results proved that the DS of PFS was a major contributor to electrostatic interaction and hydrogen bonding in the PFS–water system and greatly affected the aggregation and dispersion of PFS in aqueous solution. The PFS with a low DS was prone to aggregate to large particles in aqueous solution because of low intermolecular electrostatic repulsion and less hydrogen bonds and therefore can be used to increase the thickness and tightness of leather. The PFS with a high DS presented a small particle size with more anionic groups in aqueous solution, thereby sharply decreasing the positive charge of leather surface and facilitating the penetration of the post-tanning agents into the leather. These results might be scientifically valid for rational molecular design of syntans and more productive use of syntans in leather making. Note de contenu :
- MATERIALS AND METHODS : Materials - Preparation of PFSs with different DSs - Determination of DS of PFS - Determination of zeta potential and particle size of PFS - MD simulation - Retanning and fatliquoring - Determination of zeta potential and pIs of retanned leather - Analysis of PFS penetration in leather - Determination of uptake rate of PFS by leather - Determination of thickness increase rate of leather - Determination of leather softness
- RESULTS AND DISCUSSION : Effect of DS on zeta potential and particle size of PFS - Effect of DS of PFS on pI of retanned leather - Effect of DS on penetration of PFS in retanned leather - Effect of DS on uptake of PFS by leather - Effect of DS of PFS on thickness and softness of crust leather
- Table 1 : Simulation details
- Table 2 : Retanning process
- Table 3 : Retanning and fatliqouring processesDOI : https://doi.org/10.1186/s42825-021-00073-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00073-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37556
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p.[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Diagnosing the environmental impacts of typical fatliquors in leather manufacture from life cycle assessment perspective / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
[article]
Titre : Diagnosing the environmental impacts of typical fatliquors in leather manufacture from life cycle assessment perspective Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Yirui Lin, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 14 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement
Durée de vie (Ingénierie)
Environnement -- Etudes d'impact
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The environmental impacts of typical fatliquors were diagnosed by the life cycle assessment of industrial production and use (post-tanning) processes. Life cycle impact assessment and sensitivity analysis showed that fatliquor and fatliquoring operation were the major contributors to the environmental impacts of post-tanning because a large amount of fatliquors was consumed during fatliquoring operation. The environmental impacts of fatliquors decreased in the following order: chlorinated paraffin (CP) > sulfonated rape oil (SNR) > sulfated rape oil (SR) > phosphated rape oil (PR) > oxidized–sulfited rape oil (OSR). Sulfuric acid, fuming sulfuric acid, and chlorine used for fatliquor modification gave the main contribution to most impact categories for SR, SNR, and CP production, whereas rape oil contributed the most for PR and OSR production. OSR use process reduced the primary energy demand, abiotic depletion potential, and global warming potential by 38.5%, 56.0%, and 48.5%, respectively, compared with CP use process. These results suggested that biomass-derived fatliquors, especially oxidized–sulfited and phosphate modified fatiliquors, helped reduce the environmental burdens in leather manufacturing. Note de contenu : - MATERIALS AND METHODS : Materials - Goal and scope definition - Functional unit and system boundary - Life cycle inventory analysis - LCIA - Sensitivity and uncertainty analyses
- RESULTS AND DISCUSSION : Environmental impacts of fatliquor production process - Environmental impacts of fatliquor use process - Sensitivity and uncertainty analyses
- Table 1 Description of impact categories
- Table 2 Sensitivities of chemicals, energy, and effluents to impact categories for various fatliquor use processesDOI : https://doi.org/10.1186/s42825-022-00084-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00084-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37574
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 14 p.[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Effect of calcium in delimed hide on leather quality / Chao Lei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 3 (03/2023)
[article]
Titre : Effect of calcium in delimed hide on leather quality Type de document : texte imprimé Auteurs : Chao Lei, Auteur ; Xuyang Chen, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 109-116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Analyse
Cuirs et peaux -- Qualité
Cuirs et peaux -- Teneur en calcium
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Post-tannage
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The efficient removal of calcium from delimed hide is essential to leather quality, but few reports have elaborated on how residual calcium in delimed hide affects leather quality. In this study, four delimed hides containing different calcium content were first prepared by using ammonium sulfate and sodium gluconate. Energy dispersive X-ray spectrometry results showed that the atomic percentages of calcium on the grain surfaces of the four delimed hides were 8.17%, 4.82%, 2.34%, and 0.25%, respectively. The bating, chrome tanning, and post-tanning performances of the four delimed hides were then analyzed to evaluate the effect of calcium in delimed hide on leather quality. Results showed that the removal efficiency of non-collagenous protein from hide in enzymatic bating, the evenness of chromium distribution, the shrinkage temperature of wet blue, and the physical properties of crust leather all increased as the calcium content of delimed hide decreased. Furthermore, efficient calcium removal from the grain surface of delimed hide played a key role in the color brightness and uniformity of wet blue and crust leather. The results draw our attention to the importance of considering the effectual removal of calcium from delimed hide for obtaining high-quality leather. Note de contenu : - EXPERIMENTAL : Materials - Deliming experiments and evaluation of deliming performance - Bating experiments and evaluation of bating performance - Tanning experiments and evaluation of tanning performance - Post-tanning experiments and evaluation of crust leather performance
- RESULTS AND DISCUSSION : Preparation of delimed hides with different calcium contents - Effect of calcium in delimed hide on bating performance - Effect of calcium in delimed hide on chrome tanning performance - Effect of calcium in delimed hide properties of crust leather
- Table 1 : Color parameters of the wet blue
- Table 2 : Color parameters of the crust leathers
- Table 3 : Physical properties of the crust leathersDOI : https://doi.org/10.34314/jalca.v118i3.6814 En ligne : https://drive.google.com/file/d/1n_-gOygNCeRyRRHTXA8LSWDtFa7g5kkf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39001
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 3 (03/2023) . - p. 109-116[article]Réservation
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PermalinkEffect of retanning agents on dry heat resistance of leathers / Chao Wu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 8 (08/2013)
PermalinkEffective component in a-amylase preparation for unhairing / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 3 (03/2013)
PermalinkEffects of bactericide-protease interactions on the protease-assisted soaking performance / Hao Liu in COLLAGEN AND LEATHER, Vol. 5 (2023)
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