Greywater Treatment of Emerging Pollutant Linear Alkylbenzene Sulfonate By Adsorption With Leather Shave Waste Activated Carbon
Abstract This study aims to evaluate the use of leather shave waste activated carbon (ACLW) as an alternative for the treatment of wastewaters containing Linear Alkylbenzene Sulphonate (LAS). Batch adsorption tests were carried out (pH effect, isotherms, kinetics). The activated carbon was tested for its life cycle by desorption with solvents and it was also evaluated as a real wastewater treatment for bath greywater. Under the optimum pH of 2.5, the equilibrium isotherms correlated better with the Freundlich and Redlich-Peterson models, indicating a possible multilayer formation, and classifying the isotherm as having a high affinity. Adsorption was shown to be endothermic (∆H0 = +73.89 kJ mol-1), entropy driven (∆S0 = +0.46 kJ mol-1 K-1) and occurs spontaneously. The kinetic studies showed a best correlation with the pseudo-second order model, with activation energy of 27.5 kJ mol-1. The use of ethanol solution was effective for the regeneration of the adsorbent. The adsorption was applied in real wastewater, removing contaminants from bath greywater, especially anionic surfactants with up to 95% removal efficiency.