Biodegradability of wastewater from enzymatic soaking and unhairing processes in leather Manufacture / Qiang He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 6 (06/2006) . - p. 217-222 Titre : Biodegradability of wastewater from enzymatic soaking and unhairing processes in leather Manufacture Type de document : texte imprimé Auteurs : Qiang He, Auteur ; Bi Shi, Auteur ; Danhong Sun, Auteur ; Kai Yao, Auteur Année de publication : 2006 Article en page(s) : p. 217-222 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Enzyme-treating processes in leather making are usually considered as 'clean technology' in terms of the reduction of pollutants in wastewater. The objective of this study is to investigate the biodegradability of the wastewater collected from enzyme-treating processes. It is of great significance to characterize the pollution properties of this kind of wastewater, and to provide a reference for the biological treatment of such wastewater in effluent treating yard of tannery. The research was typified by enzymatic soaking and unhairing (ESU) processes which are encouraged to be used in leather manufacture for reducing environmental impact. The biodegradability of ESU wastewater before and after settling treatment was investigated, in comparison with that of wastewater collected from conventional soaking and unhairing (CSU) processes. It was found that ESU wastewater had better biodegradability than CSU wastewater. The biodegradation extent of ESU and CSU wastewaters reached 58.5% and 37.7% respectively in 20 days of naturally biodegrading process. Moreover, it was found that, in the presence of activated sludge, 65.5% of the total oxygen-consuming materials in ESU wastewater is biodegradable, while the value of CSU wastewater is 58.2%. En ligne : https://drive.google.com/file/d/1jZAGItlsni_ZwfJIUXM0-ZesKVySf49O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3998 [article]

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Environmental impact evaluation of typical beamhouse processes in leather manufacture based on wastewater settleability / Qiang He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 12 (12/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 12 (12/2005) . - p. 473-480 Titre : Environmental impact evaluation of typical beamhouse processes in leather manufacture based on wastewater settleability Type de document : texte imprimé Auteurs : Qiang He, Auteur ; Bi Shi, Auteur ; Danhong Sun, Auteur ; Kai Yao, Auteur Année de publication : 2005 Article en page(s) : p. 473-480 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The traditional leather industry is far from sustainable. Therefore, many new leather-making processes, so called 'cleaner technologies', have been proposed to reduce the levels of pollutant emission. The objective of this study is to make an environmental impact evaluation of such processes not only based on the quantity of wastes generated but also on the wastewater treatability. This paper is mainly concerned with the settleability of wastewater. Such an evaluation might be of great significance due to the enormous amount of wastewater and increased treatment costs. The research is typified by enzyme assisted soaking and unhairing (ESU) processes that are encouraged in beamhouse processes for protecting the environment. The chemical sedimentation behavior of ESU wastewater and the wastewater generated by conventional soaking and unhairing (CSU) processes are described and compared with each other. It was found that ESU wastewater showed better sedimentation property than CSU wastewater, indicating that the enzyme assisted soaking and unhairing processes have environmental friendliness in terms of wastewater settleability. En ligne : https://drive.google.com/file/d/1_0dJjyfAM62grW4AZU5geeIACbJLIbEa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4048 [article]

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