EFFLUENT TREATMENT OF ELECTROPLATING UNIT

The Electroplating industry is one of the top polluting industries. The effluents discharged have high concentrations of toxic heavy metal ions. Our project is an effort to reduce the toxicity of the effluent discharged from an electroplating unit. The project aims to reduce heavy metalion concentrations in the effluent discharged by employing a combined effect of precipitation and adsorption. These methods have been successfully applied and tested by us on a laboratory level and can be easily adapted at an industrial level economically. The project suggests other more sophisticated and new methods of treating effluent from an electroplating unit. We have analyzed our method of treatment from all angles and also recommended solutions to rectify its minor short comings. The report includes an adsorption bed prototype which can be used on a bigger or industrial scale. This method of treatment is simple, effective, practical and most importantly cost effective

Unexpected High CO2 over C2H2 Separation Performance by High-silica CHA Zeolite Membranes

Energy-efficient CO2/C2H2 separation by membranes is critical for producing acetylene by partial combustion of natural gas. Separating CO2 and C2H2 by membranes is challenging because they have the same kinetic diameter and similar dimensions. Here we demonstrate for the first time high-silica chabazite (CHA) zeolite membranes with surprisingly high CO2 selectivity over C2H2. Both unary permeation and binary mixture permeation data demonstrated consistent high CO2 permselectivity \u3e30. Equilibrium adsorption isotherms indicate only a slight adsorption selectivity for C2H2, implying that a high diffusion selectivity for CO2 is required for the effective separation. The dynamic uptake data, however, points to slight C2H2 diffusion selectivity in CHA zeolite crystals. Hypotheses are proposed to explain the inconsistency between crystal and membrane diffusion results