A method for safe disposal of arsenic rich sludge obtained from treatment of contaminated groundwater and its utilization in developing heat protective glass

Abstract

A METHOD FOR SAFE DISPOSAL OF ARSENIC RICH SLUDGE OBTAINED FROM TREATMENT OF CONTAMINATED GROUNDWATER AND ITS UTILIZATION IN DEVELOPING HEAT PROTECTIVE GLASS Present invention deals with the incorporation of As contaminated sludge obtained from water filtration into glass matrix to develop heat absorbing properties within the glass. The glass composition is optimized incorporating waste sludge in order to reduce near Infrared (NIR) transmission (~1000-1100 nm). A phosphate base glass composition has been melted incorporating different percentage (5-20 wt. %) of As contaminated sludge (up to 20 wt. %) to produce glass. Significant chemical durability has also been observed after 14 days of thermal cycle in distilled water at 75 oC for 8 h duration. No leaching of hazardous element (As, Fe etc.) is detected in distilled water from the glass containing 5 and 15 wt.% arsenic containing sludge by ICP AES. UV-Vis-NIR spectra suggest possibility of 30 % reduction in optical transmission at NIR region than visible region and this indicates feasibility of preparation heat shielding glass (due to low transmission at above 1000 nm). Thus, arsenic contaminated sludge can be trapped into the glass which has high heat protective properties. The potential use of this glass can be in window panel significantly reducing air-conditioning and lighting load in the building. Further, this glass can of use in glare cutting application and other application.