A simple effective treatment of tannery effluents

Abstract

Tannery effluents are one of the major sources of environmental pollution with various toxic parameters and the effluent generated during liming and pickling operations of leather processing are even more dangerous due to their high and low pH range, respectively. In the present work, liming and pickling streams generated during the production of chrome tanned cow hide shoe upper was treated at different ratios and optimized the pH range 6.5 - 7.5. The effluents were mixed at different ratios without adding any foreign chemicals and obtained the results 88% reduction of COD, 94% reduction of BOD and 97% removal of total solids. DOI: http://dx.doi.org/10.3329/jbas.v38i2.21348 Journal of Bangladesh Academy of Sciences, Vol. 38, No. 2, 235-239, 2014

Assessing the Economic Impact of Tanneries’ Pollutants in Pakistan

“…Moreover, the industry is considered one of the most polluting industries because it generates a significant amount of solid and liquid waste. In the processing of one metric ton of raw hide, 600 kg of solid waste, and 40,000 m3 of wastewater are produced (Mottalib et al, 2014). This industrial waste, finally, discharged into rivers, canals, and open lands without any treatment.…”

Reduction of Pollutants of Tannery Wastewater by Using Acidic Waste Liquor

“…So treatment of the tannery wastewater is a major issue for pollution control in leather processing countries. Many researchers have been done for the future sustainability of the tannery industry in respect of environmental pollution and to minimize the production of solid and liquid waste to maintain a safe environment for both aquatic life and human health [7][8][9][10]. The removal of chromium from wastewater may be accomplished by precipitation using the addition of lime and caustic soda [11].…”

“…All of the methods described above are involved additional chemicals or reagents that increase the costing of tannery effluent treatment. As a part of our continuous research on the reduction of pollutants of tannery waste water, we have shown 99.98% Cr [17] and a significant amount of physiochemical properties of tannery waste water can be reduced simply by mixing two different nature of waste liquor [8]. This paper focuses on waste liquors generate from different steps of leather processing those having different pH.…”