Jittin Varghese ¹, P. Lakshmi Sruthi ¹, Mary Harris ¹, P. Hari Prasad Reddy ¹

Affiliations
1 Department of Civil Engineering, NIT Warangal, Warangal - 506004, Telangana, IN

Abstract

Objectives: This paper studies the suitability of Red soil as landfill liners for the retention of Lead. Method: The study was carried out for alkaline conditions, acidic conditions and for different initial concentrations of Lead. Both Batch studies and Column studies were conducted. Findings: The Freundlich Isotherm is found to be the best fit for the data obtained from Red soils. Breakthrough curves are plotted from column experiment. Red earth under basic condition is found to be suitable as liner material. Novelty: The current research proposal is aimed to extract the maximum practical benefits from locally available materials, if necessary by suitable modification.

Keywords

Diffusion, Landfill Liners, Lead Retention, Soils

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G. Shiva Kumar ¹, Juwel Bharadwaj ¹, P. Lakshmi Sruthi ¹, M. Chandra Sekhar ¹

Affiliations
1 Department of Civil Engineering, NIT Warangal, Warangal - 506004, Telangana, IN

Abstract

Objectives: The paper studies the removal efficiency of Ammonia-nitrogen from leachate by a chemical method named “Struvite Precipitation” as the concentration of Nitrogen (major causes of eutrophication), is several times higher in leachate than in municipal wastewater. Sampling: The leachate composition and sampling was done for leachate derived from a dump type landfill named ‘Jawahar Nagar Dump Yard’, Hyderabad and was characterized as an old leachate with pH = 8.0. Methodology: The treatment process tested is a batch type lab-scale experiment for precipitation of ammonia nitrogen in the form of Magnesium-Ammonium-Phosphate (MAP). Results: With MAP (Struvite) precipitation at the optimal Mg:N:P ratio (1.2:1:1), 78% removal of inorganic nitrogen was achieved. Maximum Ammonium removal achieved is about 95% at pH of 9.0 with Mg:N:P molar ratio 1.5:1:1.5. Conclusions: Comparing the results for different Mg:N:P ratios, conclusions are drawn that it is possible to achieve effluent nitrogen requirements (50 mg N/l) by treatment of leachate with MAP precipitation. Detailed description is given in the article.

Keywords

Ammonium Removal, Leachate, Molar Ratio, Magnesium-Ammonium-Phosphate, Struvite.

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