Leather is a material with unique mechanical properties, making it widely used in the production of footwear, clothing, sports articles, and in the field of coverings, such as in the automotive, furniture, marine and aeronautical industries. Leather processing involves three major stages: beamhouse, tanning, and finishing. In each of these stages, characteristic effluents are generated, which typically reach the Wastewater Treatment Plant (WWTP) mixed, for the so called end-of-pipe treatment, consisting of primary and secondary treatment. The objective of this study is to analyze the characteristics of the effluents generated in each processing stage individually and when mixed, in order to assess how the mixture impacts degradability. For the evaluation, wastewater corresponding to the three stages was generated, using raw hides for (i) beamhouse and (ii) tanning, and wet-blue leather for (iii) wet finishing. Subsequently, chemical inputs were added to the wastewater, forming synthetic effluents. The (iv) mixture of the effluent generated in the three stages was made based on the proportion of each effluent in relation to the total generated. Analyses of Biological Oxygen Demand (BOD) and Total Organic Carbon (TOC) were performed for the four samples. The BOD obtained for the mixture was zero, while the other three effluents obtained high values for the same analysis. This result indicates that an inhibitory environment to microbial growth was formed, preventing biodegradation. The TOC results indicate that the mixture contains an organic load proportional to the effluents that compose it. It was concluded that the organic load and biodegradability of the effluent can be strongly influenced by the processing methods of each tannery, such as the amount of water and inputs used, and that the secondary treatment of mixed effluents tends to be compromised compared to segregated treatment.

O. Manuelle Minozzo

Eduarda C.S. Pistorello

Vânia Queiroz

Bruno G. Duarte

Caroline Agustini

Journal of the American Leather Chemists Association

美国皮革化学家协会杂志发表关于皮革科学、工程、技术和经济学各个方面的手稿，并将考虑解决行业关注的相关主题。示例：生皮/毛皮质量或利用、皮革生产方法/设备、制革材料/皮革化学品、新皮革和改进皮革、胶原蛋白研究、皮革副产品、皮革制品行业变化的影响、工艺效率、可持续性、监管、安全，环境，制革废物管理和行业经济学。

The Journal of the American Leather Chemists Association is a journal dedicated to all aspects of leather science, engineering, technology, and economics. We welcome manuscripts addressing relevant topics of concern to the industry, including but not limited to: the quality and utilization of raw hides and pelts, leather production methods and equipment, tanning materials and chemicals, new and improved leathers, collagen research, leather by-products, the impact of changes in the leather goods industry, process efficiency, sustainability, regulation, safety, environmental issues, leather waste management, and industry economics.

《Journal of the American Leather Chemists Association》是一本专注于皮革科学、工程、技术和经济学各个方面的期刊。我们欢迎关于行业关注的相关主题的手稿，包括但不限于：生皮和毛皮的质量与利用、皮革生产方法和设备、制革材料和化学品、新型皮革及其改进、胶原蛋白研究、皮革副产品、皮革制品行业变化的影响、工艺效率、可持续性、监管、安全、环境、制革废物管理以及行业经济学等。

Category	Quartile
工程技术	4
工程技术, 应用化学	4
工程技术, 材料科学纺织	4

Synthetic Tannery Effluent Mixture Degradability Assessment

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Journal Info

Category	Quartile
MATERIALS SCIENCE, TEXTILES	4