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Accueil du site → Doctorat → Inde → 2019 → Characterization of soil surface water and ground water surrounding waste dumpsites

Jawaharlal Nehru Technological University, Anantapuram (2019)

Characterization of soil surface water and ground water surrounding waste dumpsites

Venkata Ramaiah G.

Titre : Characterization of soil surface water and ground water surrounding waste dumpsites

Auteur : Venkata Ramaiah G.

Université de soutenance : Jawaharlal Nehru Technological University, Anantapuram

Grade : Doctor of Philosophy (PhD) 2019

Résumé partiel
The heavy metals in several types of wastes are carried to landfills along with these wastes and ultimately are accumulated in the landfill leachates. These include heavy metals such as lead and Nickel as they are common in many industrial wastes. Compacted clay soils are commonly utilized as landfill liners to control the migration of these metal ions into the surrounding environment. The low hydraulic conductivity of the compacted clay, however low it is, can allow the migration of leachates containing these metals as they can never be impermeable. However, the soil liners can retard the migration of the leachate due to its low hydraulic conductivity. The advantage of clay soil liners is that even if they allow the water to pass through them they can retard the migration of metals by retention of the metals on the soil liner. The soils can retain the metals ions. Several research works have been carried out by many researchers using clay liners, which has shown that permeability can increase due to the presence of ions in the leachate thus increasing the conductivity of the leachate. Furthermore, the durability of clay liners decreases. Hence, an effort has been made to make use of the locally available dumpsite soil as a liner material because of economic importance. Hence, in our study, Mavallipura dumpsite soil (Red soil) along with additives of fly ash and Bentonite has been used for the sorption studies using heavy metals such as lead and nickel. These studies have been conducted to improve their retention capacity and also to identify the better liner material. It has been revealed from the literature the retention properties of these mixtures are a function of additives types and properties of leachate such as pH, type of ions and concentration. From the aforesaid observations, an investigation is required to investigate to know additives effect, pH of leachate and type of ion and concentration present. The chemistry of landfill leachate (pH and ionic composition) can vary greatly owing to the variations in waste composition and reactions between infiltrating water and waste itself. It is essential that under varying conditions of the leachate the soil mixtures (i.e. soil + additives) should not release the retained contaminants. Hence in the present study, the aspect of leaching would be examined under the charged physicochemical environment of the leachate. To examine the kinetics of adsorption, time-dependent studies on dumpsite soil and their additives would also be undertaken. The empirical models such as Langmuir and Freundlich used on experimental data, to ascertain the adsorption is of xiii monolayer or adsorption of the heterogeneous layer. These models can also be applied to kinetics data to make sure that the type of sorption taking place is pseudo-first-order or pseudo-second-order lagrangian models, or Intraparticle diffusion or Elovich model [106][107].

Présentation et version intégrale (Shodhganga)

Page publiée le 25 février 2021