EFFECT OF ACID LADEN MINING EFFLUENT ON CHARACTERIZATION AND PHYSIO-CHEMICAL BEHAVIOUR OF CLAYEY AND SANDY SOIL

CIM Edmonton 2004
Saravanane Raman,
Abstract EFFECT OF ACID LADEN MINING EFFLUENT ON CHARACTERIZATION AND PHYSIO-CHEMICAL BEHAVIOUR OF CLAYEY AND SANDY SOIL

V. Murugaiyan1*, R. Saravanane1 T.S. Sundararajan1 and V.K. Stalin2
1Geotechnical Engineering Laboratory, Department of Civil Engineering, Pondicherry Engineering college, Pondicherry – 605 014, India.
2Geotechnical Engineering Division, College of Engineering, Guindy, Anna University,
Chennai – 605 025, India


In the recent years, greater emphasis has been focused on the issue of reclamation of mining and oil effluent contaminated natural clay and sandy soil sediments and layers. The key causative factor has been identified and hence the major effort has been reflected on characterization of mining effluent contaminated sand and clay layers and its remediation on wider physiochemical and Geochemical perspectives.

In the present study, an attempt has been made to characterize the acid laden mining effluent contaminated clayey and sandy soil and its effect on significant parameters governing reclamation of contaminated soil site. The main objective of the study was to evaluate the degree of contamination and the possible extent of reclamation in contaminated soil site through the effect of permeation of organic content (COD), solid retention time (SRT) and chloride and sulphate ions diffusion in soil mass. The effect of SRT was also evaluated for Liquid Limit , Plastic Limit & Shrinkage Limit in contaminated soil samples. The experiment setup consisted of a PVC column of diameter 7.5cm and height 80cm with the required control values. The entire experiment was conducted under the batch and continuous mode.

A locally available native soil specimen (clayey & silty soil ) was subjected to amino acid effluent diffusion. The samples obtained from a local sources a steady study at the end of 73 days. The pH value of the soil sample was found to get stabilised at the end of 73rd day indicating that the chloride and sulfated diffusion attained study state in the chosen soil sample. The Solid Retention Time (SRT) for chlorides and sulphates was found to have increased and attained the maximum vaule at the end of 33rd day and gradually attained study state towards the end of the 73rd day. The maximum concentrations of chlorides & sulphates accumulated were found to the 252.5mg/l and 405mg/l respectively. The study was carried out for varying concentrations of chlorides, sulphates & COD. Based on the above experimental investigations it was concluded that the amino acid effluent was detrimental to soil properties in terms of varying pH values, and larger SRT and higher concentration of organic solids accumulated in the solid mass. The Liquid limit for the soil specimen (Clayey & silty) attained a maximum values of 72% at end of steady state. The plastic limit & shrinkage limit were found to be 60.10% and 16.43% respectively. It is strongly contented that the retention of organic and inorganic solids in soil mass contributed to the change in liquid limit , plastic limit & shrinkage limit of the contaminated soil mass.

It is expected that the present study will widen the horizon for the remediation of contaminated soil, as waste land development has been set out as a majority priority area under sustainable development program of India.
*corresponding author: e-mail: vpmpl@yahoo.com
Keywords: acid laden, behaviour, sandy soil, physiochemical, mining effluent, clayey, Characterization
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