A Study On Influence Of Real Municipal Solid Waste Leachate On Properties Of Soils In Warangal, India

Warangal city generates three hundred tons of garbage daily which is dropped into the Rampur dump yard by Warangal Municipal Corporation (WMC). Dumping of wastes will lead to the formation of leachate which in turn will cause environmental issues like soil and ground water contamination. Chemical analysis of leachate indicates that calcium, chloride, sodium and magnesium are the major ions, along with organic content. This leads to contamination of soil as well as ground water bodies. In this study, authors have attempted to know the behavior of soil under the influence of leachate. Contaminated specimens were prepared and tested for Atterberg limits, shear strength, swell potential and hydraulic conductivity of CH and SC which are present in the dumping yard. Index properties, hydraulic conductivity and swell potential decreased with increase in leachate concentration. Unconfined compressive strength also showed an increase. The decrease in hydraulic conductivity indicated the clogging of pores. In a nutshell, the present work deals with the impact of leachate on the index and engineering properties of CH and red soil

Studies on the Performance of Air Cyclone Separator for Removal of Particulate Matter

Emissions from industries and air pollution from these emissions adversely affects the environment and public health. For instance, India depends largely on coal for its power generation. The problem with Indian coal is that it carries a lot of dust with it. Hence, dust carried along with the flue gases has to be separated before sending the gases for further treatment. Cyclone separa-tor, bag filter and electrostatic precipitator have found applications in technological use. ESP demands high voltage (power requirements) whereas general bag filters cannot work beyond 120C. However, cyclone separators have less temperature and pressure limitations and requires low pressure drop. Hence, cyclone separators are usually selected to separate dust from fluid streams

A review on study of Electrokinetic stabilization of expansive soil

Needless to elaborate the harmful effects of the Expansive soil on the light-weight structures, as it is a very common problem faced by the Structural and Geotechnical engineers all over the world. In INDIA, the site having BlackCotton soil force the local engineers to think differently in order to find a way which can improve the ground condition very efficiently. One solution, which is not used worldwide, is the Electrokinetic Treatment which uses the principle of Electroosmosis, Electromigration and Electrocementation, and has been proved the best for fine grained soil. Till now, inadequate studies have been done to prove its efficiency in using it for the expansive soil. Apparently, there may be some reasons why the researchers don't consider this technique useful in such soils. This paper includes the whole and sole of this treatment reckoned from the past studies and its scope in implementation with Expansive soils. Experimental study, both in field and laboratory, followed by its analysis using available software packages, is required to decide the factors of this treatment influencing expansive soil

Pneumatic Radial Loading To Ease Preloading – An Innovative Technique

Soft ground improvement gained prominence all overthe world in view of ever growing engineering activities forvarious purposes. In view of serious problems during and afterconstruction in these deposits, vertical drains method usingpreloading is being frequently applied to improve these soil beds.However, in view of the difficulties associated with this technique,an alternative vacuum preloading technique was developed. Butvacuum preloading is also limited to the available atmosphericpressure with inevitable technical difficulties. The present paperdiscusses an innovative technique of applying radial pneumaticpressure with the help of inflatable balloons/tubes. The drainageis facilitated along the surface of inflatable tubes by providingfabric strips/the traditional strip drains. The laboratoryexperimentation in test tank indicated that this technique has thepotential for practical applications

Anchor Piled Footings – An Alternative Foundation Technique in Expansive Soils

A search for alternative foundation systems inexpansive soils has been continued since their problems wererecognized all over the world. Despite the availability of a goodnumber of remedial techniques, their adoptability andeffectiveness under varied geographical and climatic conditionshave remained questionable. The present paper discusses the fieldinvestigations on the recently promulgated technique of anchorpiled footings in expansive soils. These studies have revealed thatthe granular anchor piles exhibit promising pullout capacity evenunder fully wet condition compared to conventional concrete piles.The heave of model footings provided with granular anchor pilesdecreased by about 73-93% while for footings provided withconventional concrete piles the heave value is decreased by 40 -75%. It is felt from this study that the above technique of anchorpiled footings can be an effective alternative to conventional pilefoundations in expansive soils

Theoretical Study of Photo-Luminescence Emission Using the Line Shape Function for Semiconductor Quantum Dots

The outcome of particle size effect on Photoluminescence has been investigated theoretically for CdS, ZnS, CdSe and ZnSe quantum dots. The theory is based on computational modeling in the strong confinement region only where the particle size is less than Bohr’s radius. The Photoluminescence emission line shape function which depends on band gap was found to be strongly dependent on particle size. The PL spectra of bulk material is similar for the quantum dots where similar vibronic coupling and normalized intensity is considered, only the peak wavelength changes and thus shifts the band edge luminescence peak to higher energies for the quantum dots corresponding to their band gap with no broadening. The PL spectra of monodisperse dots revels the fact that the shape of the emission peak is same, only it shift towards higher energy or smaller wavelength for decreasing size of quantum dots

Electron beam induced deposition of silacyclohexane and dichlorosilacyclohexane: the role of dissociative ionization and dissociative electron attachment in the deposition process

We present first experiments on electron beam induced deposition of silacyclohexane (SCH) and dichlorosilacyclohexane (DCSCH) under a focused high-energy electron beam (FEBID). We compare the deposition dynamics observed when growing pillars of high aspect ratio from these compounds and we compare the proximity effect observed for these compounds. The two precursors show similar behaviour with regards to fragmentation through dissociative ionization in the gas phase under single-collision conditions. However, while DCSCH shows appreciable cross sections with regards to dissociative electron attachment, SCH is inert with respect to this process. We discuss our deposition experiments in context of the efficiency of these different electron-induced fragmentation processes. With regards to the deposition dynamics, we observe a substantially faster growth from DCSCH and a higher saturation diameter when growing pillars with high aspect ratio. However, both compounds show similar behaviour with regards to the proximity effect. With regards to the composition of the deposits, we observe that the C/Si ratio is similar for both compounds and in both cases close to the initial molecular stoichiometry. The oxygen content in the DCSCH deposits is about double that of the SCH deposits. Only marginal chlorine is observed in the deposits of from DCSCH. We discuss these observations in context of potential approaches for Si deposition.CWH likes to thank Luc van Kessel, Kerim Arat and Sebastiaan Lokhorst for their assistance with the Monte Carlo simulations of Figure 10. OI acknowledges supported from the Icelandic Center of Research (RANNIS) Grant No. 13049305(1-3) and the University of Iceland Research Fund. RKTP acknowledges a doctoral grant from the University of Iceland Research Fund and financial support from the COST Action CM1301; CELINA, for short term scientific missions (STSMs)Peer Reviewe

A Study on influence of organic ligands on migration of heavy metals through compacted clayey soil

This paper presents the feasibility study on utilization of locally available clayey soil as Compacted Clay Liner based on its contaminant migration capacity under the presence of organic chemical EDTA (Ethylene Diamine Tetra acetic Acid) which is abundantly released into the environment. Lead, Nickel, cadmium and chromium ions was selected as contaminants and its migration properties are assessed by conducting column studies with a single and multiple heavy metal solution with the EDTA. From the experimental investigations, it is revealed that with the presence of EDTA, the contaminant breakthrough time get reduced due to soluble metal – EDTA complex formation. At pH 2, interaction with multi metal, the mobility was increased and the order of mobility was observed as Cr > Cd > Ni > Pb. With the presence of EDTA in multi metal system at pH 2, the order of the mobility was Cr > Ni > Cd > Pb and at pH 7 the mobility of heavy metals were increased the order was Cr > NI > Pb > Cd. This study reveals that locally available clayey soil is capable of retaining heavy metals and it may be used as a compacted clay liner, where organic chemical like (EDTA) ingression is present