Abstract
The tannery effluents are characterized by high toxic pollutants such as sulfides; used in the tanning of animal’s skin. The mean objective of this work is the evaluation of the pollution degree of various operating units, and the treatment of tannery effluent generated from unhairing-liming unit. According to physicochemical characterization, this effluent was largely basic and very loaded in sulfides, which have harmful effects on human health and the environment as well. Otherwise, the microbiological characterization showed an absence of pathogenic bacteria and a low concentration of mesophilic aerobic flora, because of this effluent toxicity. Thus, the treatment of this effluent is indispensable before its reject into the environment. In fact, chemical precipitation is a promising approach for the treatment of this effluent. In this regard, ferric chloride was used as chemical agent to reduce and removal sulphide ions from this effluent. As result, this treatment gave an excellent abatement rate of sulphide, which reached more than 90% using a pH of 8.5 and a ferric chloride concentration of 1.4 mol/L.
Highlights
IntroductionThe leather industry plays an important role in the global economy, in African countries [1, 2], in Morocco [3]
The tanning industry is an important activity, which involves the processing of leather animal skin by removing fat and hair through different operations namely unhairing-liming, rinsing, delimingbating and tanning ... etc
The results show that the chemical oxygen demand (COD) and sulfide ions had the same evolution of elimination depending on the pH and concentration of ferric ions
Summary
The leather industry plays an important role in the global economy, in African countries [1, 2], in Morocco [3]. The tanning industry is an important activity, which involves the processing of leather animal skin by removing fat and hair through different operations namely unhairing-liming, rinsing, delimingbating and tanning ... Tanning industries have been known as a pollution source in the whole world, including Morocco They always reject into the environment a large amount of wastewaters, which is loaded with toxic pollutants such as sulfides. All these studies are only focused on chromium removal from these effluents, and they ignored the elimination of sulfides even they very toxic. In this regard, the objective of this chapter was the evaluation of the quality of tannery effluents rejected from different tanning operations. The treatment of wastewater loaded in sulfide and generated from unhairing-liming operation
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