Leaching and Mechanical Behaviour of Solidified/Stabilized Nickel Contaminated Soil with Cement and Geosta

Nicholas Hytiris,Panagiotis Fotis,Abdelkrim Bennabi,Theodora-Dafni Stavraka,Rabah Hamzaoui

doi:10.11159/ijepr.2015.001

Abstract

In the present work, solidification/stabilization (S/S) of nickel contaminated soil using Ordinary Portland CementOPC and commercial was carried out. Effects of different binder combinations of OPC and commercial stabilizer wt% in the S/S mix designs and physical and chemical characteristics of the treated samples were investigated. The mechanical property studied was unconfined compressive strength-UCS while chemical characterization of the samples was focused on the leachability of nickel. Results indicated that the optimum mix design, in terms of mechanical efficiency, was 10% OPC wt% and 4.2 wt% commercial stabilizer while in terms of chemical efficiency 10% OPC wt% and 1.4 wt% commercial stabilizer.

Highlights

Stabilization/solidification (S/S) is one of the major methods in treating hazardous wastes prior to land disposal and an effective technique for reducing the leachability of contaminants in soils like, heavy metals [1, 2]
Solidification and stabilization (S/S) related processes such as chemical and physical stabilization of contaminants, dangerous to natural and build environment, have been identified as Best Demonstrated Available Technology-BDAT for 57 different hazardous wastes under the Resource Conservation and Recovery Act-RCRA [3, 4]
The leachability limits are extracted from the Interdepartmental Committee on Redevelopment of Contaminated Land (ICRCL) while the UCS limits are extracted from regulatory waste limit at a disposal site in the United Kingdom

Summary

Introduction

Stabilization/solidification (S/S) is one of the major methods in treating hazardous wastes prior to land disposal and an effective technique for reducing the leachability of contaminants in soils like, heavy metals [1, 2]. Solidification and stabilization (S/S) related processes such as chemical and physical stabilization of contaminants, dangerous to natural and build environment, have been identified as Best Demonstrated Available Technology-BDAT for 57 different hazardous wastes under the Resource Conservation and Recovery Act-RCRA [3, 4]. Nickel is considered to be one of the most dangerous chemical elements, which may cause permanent soil contamination due to its specific physicochemical properties and mechanisms of action [8, 9]

Objectives

Methods

Results

Conclusion