scholarly journals Study of the dechroming of tanned leather wastes

2004 ◽  
Vol 58 (2) ◽  
pp. 64-68
Author(s):  
Tatjana Botic ◽  
Nadezda Iliskovic ◽  
Dijana Drljaca
Keyword(s):  
Solid Waste ◽  
Alkaline Hydrolysis ◽  
Leather Industry ◽  
Primary Target ◽  
Initial Amount ◽  
Economic Saving ◽  
Tanning Process ◽  
Leather Wastes ◽  
Oxidation Agent ◽  
Tanning Industry

According to European legislation, it is not possible to dump any chromium-containing waste in Europe. The minimization of wastes is a key element in that strategy. It involves the application of clean technologies: low and non-waste technologies. The tanning industry generates substantial quantities of chromium-containing solid waste in the form of shavings and trimmings. The recycling and reuse of those wastes must be the primary target in optimizing processes of the leather industry. The problem is in a satisfying chromium separation from collagen fibers. Common hydrolysis processes-alkaline or acidic-give gelatins containing residual chromium (III). By using an oxidation agent (H2O2) before alkaline hydrolysis, in was demonstrated that chromium from chromium-containing leather wastes can be almost fully recovered by the previous oxidation of Cr(III) to Cr(VI). This chromium can be reused in the tanning process. That would represent an economic saving. The best result of the dechroming process was a gelatin hydrolyzate with only 1.11 in respect to the initial amount.

scholarly journals Tannery Solid Waste into Wealth by Non-Edible Gelatin Production from Raw Trimmings

2019 ◽  
Vol 4 (10) ◽  
pp. 167-172
Author(s):  
Md. Saidur Rhaman Shakil ◽  
Sobur Ahmed ◽  
Estehad Pathan
Keyword(s):  
Solid Waste ◽  
Raw Materials ◽  
Chemical Properties ◽  
Solid Wastes ◽  
Leather Industry ◽  
Process Manufacturing ◽  
Tanning Process ◽  
Leather Wastes ◽  
Tannery Solid Waste ◽  
Optimum Extraction

During the conversion of raw hides or skins into leather involves generation of enormous amount of solid waste which has been major concern for environment and cause detrimental effect on it. In leather industry solid wastes can be generated almost from all operations including pre-tanning, tanning, and even post tanning operation. Solid wastes are mainly raw trimmings, fleshing, chrome shaving, buffing dust, keratin, finished scraps etc. The economic development of a country depends on the utilization of indigenous raw materials and their by-products.  This paper focuses on utilization of raw trimmings into useful product like non edible gelatin those demand is going up day by day due to its versatile application in various fields. Raw trimmings are mainly originated during sorting of leather before actual tanning process happens and best for non- edible gelatin production as it does not contain any harmful chemicals. This study will also describe the chemical properties of gelatin, gelatin manufacturing process, manufacturing parameters from the leather wastes like raw trimmings. Optimum extraction of non-edible gelatin from raw trimmings found at 75-85ₒC for 12 hours in slightly basic condition. This study found that huge amount of raw trimmings which generally thrown directly to environment can serve as potential raw materials for the manufacture of non-edible as well as edible gelatin.

scholarly journals Composite Polymers from Leather Waste to Produce Smart Fertilizers

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4351
Author(s):  
Daniela Simina Stefan ◽  
Magdalena Bosomoiu ◽  
Rodica Roxana Constantinescu ◽  
Madalina Ignat
Keyword(s):  
Waste Disposal ◽  
Water Soluble ◽  
The Other ◽  
Leather Industry ◽  
Negative Effects ◽  
Chemical Fertilizers ◽  
New Class ◽  
Composite Polymers ◽  
Tanning Process ◽  
Leather Wastes

The leather industry is facing important environmental issues related to waste disposal. The waste generated during the tanning process is an important resource of protein (mainly collagen) which can be extracted and reused in different applications (e.g., medical, agricultural, leather industry). On the other side, the utilization of chemical fertilizers must be decreased because of the negative effects associated to an extensive use of conventional chemical fertilizers. This review presents current research trends, challenges and future perspectives with respect to the use of hide waste to produce composite polymers that are further transformed in smart fertilizers. Hide waste contains mostly protein (collagen that is a natural polymer), that is extracted to be used in the cross-linking with water soluble copolymers to obtain the hydrogels which are further valorised as smart fertilizers. Smart fertilizers are a new class of fertilizers which allow the controlled release of the nutrients in synchronization with the plant’s demands. Characteristics of hide and leather wastes are pointed out. The fabrication methods of smart fertilizers and the mechanisms for the nutrients release are extensively discussed. This novel method is in agreement with the circular economy concepts and solves, on one side, the problem of hide waste disposal, and on the other side produces smart fertilizers that can successfully replace conventional chemical fertilizers.

Production of Asphaltene Binders from Solid Waste Generated in Leather Industry

2018 ◽  
pp. 407-419 ◽  
Author(s):  
K. Patchai Murugan ◽  
M. Sri Ganesh Kumar ◽  
K. Santhana Krishnan ◽  
V. Vignesh Kumar ◽  
S. Ajai Kumar ◽  
...  
Keyword(s):  
Solid Waste ◽  
Leather Industry

Dechroming: An Alternative Treatment for Leather Shavings, to Obtain a Biocompatible Collagen without Environmental Impacts

2018 ◽  
Vol 930 ◽  
pp. 535-540
Author(s):  
Nelissa Garcia Balarim ◽  
Dalita Gomes Silva Morais Cavalcante ◽  
Andressa Silva Gomes ◽  
Flavio Camargo Cabrera ◽  
Aldo Eloizo Job
Keyword(s):  
Solid Waste ◽  
Hazardous Waste ◽  
Alternative Treatment ◽  
Scientific Literature ◽  
Test System ◽  
Leather Industry ◽  
Genotoxic Effects ◽  
Toxic Materials ◽  
Valuable Product

One of the biggest problems facing the leather industry is the production of solid waste with chromium. Dechroming process remove chrome from leather waste and it is designed to recover the value of collagen in the waste. Thus, the aim of this study was try to improve a methodology of dechroming process already described in the scientific literature, seeking to increase the percentage of dechroming ratio, as well as to evaluate the cytotoxic and genotoxic effects of the dechromed samples obtained from the leather residue for possible applications that require non-toxic materials based on collagens. As results, the dechroming process has been shown to be effective, with 99.29% of chromium removed from the shavings. In addition, it is possible to infer that the process of dechroming performed in this study was efficient in the neutralization step of hexavalent chromium and that the collagen from the leather residue did not shows cytotoxic and genotoxic effects for the evaluatedin vitrotest system. Therefore, this treatment allows to obtain a valuable product extracted from what was previously a hazardous waste.

scholarly journals Generation of fleshings at beamhouse in tannery and its environmental impact assessment: Bangladesh perspective

2015 ◽  
Vol 50 (3) ◽  
pp. 227-232 ◽  
Author(s):  
MA Hashem ◽  
MS Nur A Tomal ◽  
BK Mondal
Keyword(s):  
Environmental Impact ◽  
Solid Waste ◽  
Industrial Area ◽  
Solid Wastes ◽  
Alkaline Ph ◽  
Huge Amount ◽  
Goat Skin ◽  
Leather Processing ◽  
Negative Effect ◽  
Tanning Process

Leather processing involves the conversion of putrescible hide/skin into imputrescible leather and consequently huge amount of solid waste generated in tanning process. In tannery at beamhouse, fleshing is one of the most indispensable mechanical operations in leather processing where significant amount of solid waste (termed as fleshings) is produced. A work was carried out to estimate the generated fleshing and to assess its environmental impact. In Bangladesh yearly 20.1×103 MT fleshings was generated only from cow hide and goat skin where 10.3×103 MT for cow hide and 9.8×103 MT for goat skin. The generated fleshings are usually kept indiscriminately inside or outside the industrial area as green. In rainy season, all fleshings including other solid wastes are washed away and finally fall in to the river, Buriganga. Fleshings contained alkaline pH (12.3±0.2), fat, proteins, lime and sulphide. Improper management of fleshings has negative effect on human health, air, water, land and plant.Bangladesh J. Sci. Ind. Res. 50(3), 227-232, 2015

Preparation of light weight constructional materials from chrome containing buffing dust solid waste generated in leather industry

2016 ◽  
Vol 19 (2) ◽  
pp. 928-938 ◽  
Author(s):  
K. Sivaprakash ◽  
P. Maharaja ◽  
S. Pavithra ◽  
R. Boopathy ◽  
G. Sekaran
Keyword(s):  
Solid Waste ◽  
Light Weight ◽  
Leather Industry
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