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Item Unscientific methods of disposal of solid waste as landfills on low lying area cause serious environmental geotechnical problems. The leachate generated from the decomposition of solid waste causes the pollution of soil layers. In this study an attempt has been made to investigate the effect of leachate on soil chemical properties by laboratory tests. The tests included the pH, Electrical conductivity, Hardness, Chlorides, Sulphates, Nitrates, Sodium, Potassium, Ammonia, Nitrogen and Phosphate contents of lateritic soil. The results of this study are presented in this paper. Copyright © Enviromedia.(Effect of solid waste leachate on chemical properties of lateritic soil) Bala Murali Krishna, C.; Yaji, R.K.; Shrihari, S.2005Item Predictive simulation of leachate transport in a coastal lateritic aquifer when remediated with reactive barrier of nano iron(Elsevier B.V., 2020) Divya, A.; Shrihari, S.; Ramesh, H.The current study focuses on determination of extent of groundwater contamination on a typical tropical coastal aquifer due to a landfill located at Vamnjoor in Dakshina Kannada district, India with the help of groundwater flow model, MODFLOW and MT3DMS when remediated with permanent reactive barrier of nano iron. The aquifer considered is a shallow, unconfined one with laterite soil which gets good rains during monsoon and will be dry during rest of the year. The adsorption by laterite soil has been considered. The specific yield and transmissivity were estimated to be 7.85% and 213m2/day respectively. After calibrating successfully with Nash–Sutcliffe efficiency 0.8, horizontal hydraulic conductivity was set as 7 m/day. Validation of model was then done with the field data and is applied for forecasting the spread of contaminant for anticipated future scenarios. The results show that in spite of retardation offered by lateritic soil, contaminant trail is expanding with a velocity of 0.15 m/day in downstream direction. When permeable reactive barrier of nano iron which can adsorb nearly 65% of chemical oxygen demand is installed, it is showing that the contaminant spread can be reduced to 400 mg/l at the observation well located at 1 km from landfill. Hence a comprehensive remedial alternative of permanent reactive barrier of nano iron can be recommended for preventing groundwater contamination from landfill leachate. © 2020 Elsevier B.V.