Removal of heavy metals from tannery effluent using chitosan-g-poly(butyl acrylate)/bentonite nanocomposite as an adsorbent

Abstract

In the present era, due to industrial revolution in the developing countries like India, the ground water system has been largely polluted. Tannery effluent is a major source of aquatic pollution, and a large number of tanneries are scattered all over India particularly in Tamilnadu, Uttar Pradesh and West Bengal. This work deals with the removal of heavy metals chromium and lead and the reduction of the important physicochemical parameters like total dissolved solid (TDS), total suspended solid (TSS), total solids (TS), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total hardness, salinity, turbidity and electrical conductivity from the tannery wastewater by using chitosan-g-poly(butyl acrylate)/bentonite nanocomposite as an adsorbent. The batch system was used to conduct the biosorption experiments. The influence of different experimental parameters, such as contact time, pH and amount of adsorbent, was evaluated. The results showed that the prepared nanocomposite can be used efficiently for the treatment of tannery wastewater containing heavy metals.

Characterization and identification of bacterial pathogens from treated tannery wastewater

“…During the tanning process, chromium salt is used to convert hides into leather and the wastewater generated contains huge amount of organic matter, phenolics, tannins and toxic heavy metals mainly chromium (Ma et al, 2015;Kongjao et al, 2008;Nithya and Sudha, 2016). This wastewater containing a variety of toxic pollutants when discharged into the environment causes serious…”

Applications of Chitin in Medical, Environmental, and Agricultural Industries

“…With our comprehensive understanding of how chitin works with heavy metals, research has now shifted to using a composite material that compliments the structure of chitin to further improve the adsorption of inorganic contaminants. As it has been long established that metals are non-biodegradable, the removal of potentially harmful metals from waste requires different techniques, such as precipitation, ion exchange, cementation, electrodepositing, and membrane separation [59,60]. These techniques are legally mandated and follow heavy scrutiny for proper waste management.…”

“…These techniques are legally mandated and follow heavy scrutiny for proper waste management. However, the high cost may result in researchers finding other novel techniques that are more cost-effective [59,60]. As mentioned before, chitin itself is limited in its adsorbent capabilities due to its relatively low mechanical and chemical resistance to other biopolymers, affecting real scale adsorbent rates [59,60].…”

Ultrasound assisted batch operation for the adsorption of hexavalent chromium onto engineered nanobiocomposite

“…leather, mining, metallurgical (steel, ferrous- and nonferrous alloys), refractory (chrome and chrome-magnetite), electroplating, tannery, timber treatment and chemical (Dubey and Gopal, 2007). Treatment of chromium containing wastewater becomes a high priority issue to safeguard the environment and the lives on the earth (Nithya and Sudha, 2016).…”