Treatment Of Waste Water From Leather Industry By Adsorption And Thermal Catalytic Processes

Abstract

newline Nowadays, controlling of water pollution is the global concern field of scientific newlineresearch. To meet stringent regulating measures set by various regulatory authorities for newlineeffluent discharge, it is a challenging task for various industries. Among all the newlineindustries, tannery is well-known as one of the major polluting industry in India which newlinegenerates substantial amount of wastewater from the tanning process. The wastewaters newlineproduced from tanneries are very complex in nature due to the utilization of huge newlineamount and various types of chemicals tannery processing. Hence, the tannery newlinewastewater must be treated before discharge into water bodies till it falls under newlineacceptable limit. Various processes such as adsorption, biological process, thermal newlinecatalytic, membrane technology, electrochemical etc. are reported for industrial newlinewastewater treatment. Amongst all the above processes, adsorption and thermal newlinecatalytic process have appeared as effective processes for the treatment of polluted newlinewastewater originating from various industries. newlineIn the first part, the present work aimed with the capability of an efficient adsorbent to newlineremove Cr (VI) from tannery wastewater in a batch process. Highly efficient and lowcost adsorbent was prepared from tea waste (TW). The characterization of adsorbent newlinewas done by TGA, FT-IR and SEM with EDS. Key parameters including adsorbent newlinedosages, contact time, solution pH, temperature and effluent concentration on the newlineprocess of adsorption were optimized for the best removal efficiency of Cr (VI). newlineSolution pH played a major role in removing the chromium. Almost 97% Cr (VI) newlineremoval was found at the optimum conditions (viz. solution pH 3.9, adsorbent dosages 6 newlineg/L, contact time 240 min and temperature 303 K). The % removal of Cr (VI) was newlineenhanced with dilution of the samples. The adsorption data followed the pseudo-second newlineorder kinetics model, and the corresponding rate constant was observed as 2.12 x 10-4 g newlinemg-1 min-1 with a high value of regression coefficient (R2 = 0.9901). Langm