Abstract
The textile industry, very important for the world economy, generates an effluent containing dyes, and which, when discarded in water bodies without proper treatment, can cause impacts to human health and the environment. One of these widely used dyes is methylene blue, whose characteristics are high solubility in water and its toxic potential, and which effects range from eye irritations, nausea, vomiting and even mental confusion. Among the potential adsorbents of this dye is chitin, which is a biopolymer extracted from the shrimp exoskeleton. Aiming at the development of a low-cost adsorbent material with potential use in the textile effluent treatment industry, the ability to remove methylene blue dye by shrimp residue chitin, obtained by eleven different methodologies, was verified. The three most efficient treatments reached approximately 75% of dye removal, proving the high adsorption power of shrimp residue. In addition to providing technological development of materials, the research brings socioeconomic benefits to the fishermen’s colony with the use of shrimp residue for the adsorption of other waste from the textile industry, contributing to the sustainability of both activities and reducing the environmental impact.
Highlights
The pollution of water bodies is a worrying environmental impact, considering that it brings more comprehensive damage to the environment, due to difficulties in controlling and monitoring, and provides indirect impacts to the soil, atmosphere, economy, public health and ecosystems in general (Barbosa, 2014)
This action was confirmed by the following measurements that indicate the decrease in the amount of methylene blue (MB) adsorbed
The results showed that T3, T4 and T5 obtained the best removal percentages, with 74%, 75% and 74% efficiency in the removal of the dye at the end of incubation, respectively (Figure 6)
Summary
The pollution of water bodies is a worrying environmental impact, considering that it brings more comprehensive damage to the environment, due to difficulties in controlling and monitoring, and provides indirect impacts to the soil, atmosphere, economy, public health and ecosystems in general (Barbosa, 2014). Among the effluents released in the springs is the effluent of the textile industry. In the production process of the textile industry, dyes are generally used, which are recalcitrant, highly toxic molecules, even in low quantities (Ferreira et al, 2007). During the washing of textile parts, approximately one third of reactive dyes are left in wastewater, which, when released into water bodies, without proper treatment, can impact human health and the environment (Oliveira et al, 2018)
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