Thermal treatment is the main force for crystallization and phase transformation, the behavior of precursors on heating revels a lot of information about the possible phenomena of involving stability, sensitivity and some predictive ability of zeolites. Thermo-gravimetric (T.G.) in combination with differential thermal analysis (D.T.A.) changes in precursor samples including the structure collapse and phase transformation at high temperatures were checked by recording T.G./DTA plots of Highi silica H-US Y zeolites using SETERAM T.G.DTA-92 instrument in air atmosphere 0 30ml//min. at a heating rate of 5 c //min. the range of temperature studied 0 using this instrument is from room temperature (RT) to 1000 c . The selective samples are post Synthesized and are obtained from low silica Na-Y zeolite converted in to high silica USY zeolites, are studied in the present paper. The post synthetic modification of the original samples affects the pore dimension, crystalinity, void volume, frame work structure, catalytic activity, selectivity, stability etc of the original sample. The Na-Y zeolite is made available from Union carbide corporation, USA (Linde,SK-40) for the post Synthetic modification having ratio of Si/Al=2.4.Scanning electron microscopy(SEM) technique is used to measure the particle size distribution and morphology of the crystals. The amorphous materials present can be determined from the micrographs. In the present study TG/DTA and the SEM technique is also used for the purpose of the above study.The importance of thermal stability and the interest in the high temperature properties of zeolites is largely related to their use in petrochemical catalytic cracking reaction. All the samples are characterized by using XRD, AAS, FPS, UV-VISIBLE, NMR, FTIR,TG/DTA, SEM, techniques etc.

Water is an essential source to life and is important to understand that urban water management and its conservation play a critical role in enabling a sustainable urban environment. Having a secure supply of clean water to a town is of fundamental importance as it is known to all, the multi-interest utilization of water resources everywhere. But in recent years, on account of the growing pressures upon urban water supplies due to rapidly increasing urban population, water scarcity has become a serious issue especially in Darjeeling hills which unlike plains lack the advantage of alternative sources. The faulty anthropogenic activities have vitiated the water resources in the region. The present paper attempts to assess the water supply in Kurseong town, to probe into the causes of water scarcity, to identify the associated problems and to suggest alternative measures.