Economic Feasibility Study of Horticultural Wastes for Chromium Adsorption from Tannery Wastewater

Present Study Shows the best horticultural wastes management using these wastes to adsorb chromium from wastewater. Waste water treated this way can be reused for various purposes which is indirectly a social welfare. These low cost adsorbents also reduce the cost of final product and the water contaminated by chromium becomes free of chromium which ultimately joins our natural streams preventing them from pollution. A successful trial is achieved for the estimation of the cost of adsorption while studying economic feasibility of various horticultural wastes like mango (Mangifera indica) waste in both the forms like seed and seed shell waste and papaya (Carica papaya) to remove hexavalent chromium from tannery wastewater. The cost for a unit gram of hexavalent chromium removal from wastewater using these adsorbents such as; mango (Mangifera indica) both seed and seed shell waste and papaya (Carica papaya) were estimated as Rs.1.38, Rs.4.03, Rs.2.37 respectively. The investigations show that the cost of using these agro wastes as adsorbents is very very less as compared to commercial activated carbon's cost i.e. Rs.142.145. The prepared adsorbents from horticultural wastes proper waste management. Adsorbents mango (Mangifera indica) both seed and seed shell wastes and papaya (Carica papaya) wastes have the positive enthalpy ΔH values 2.129, 1.836 and 2.433 respectively indicated the endothermic sorption with strong attachment, the positive free energy change ΔG; 2.312, 1.794 and 2.97 claim the random feasibility. Attachment with adsorbent surface shows the degree of freedom loss with negative value of entropy (ΔS) for seed of mango waste (−0.739), seed shell of mango waste (−0.087) and seeds of papaya waste (−0.0378). The low cost adsorption of chromium using horticultural wastes from aqueous solutions is a sustainable solution with 6 “R”.