ABSTRACT:

Dredging along the coastal regions of Singapore results in a huge amount of marine sediments which has thrown considerable challenge for disposal. In this study, an attempt has been made to examine the concentration level of contaminants present in the marine sediments collected at Changi coast. Test results indicated low concentrations of metals, and they are within the permissible limits. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) techniques have been used to investigate the mineralogical and fabric arrangement of soil samples. Sintering process has been attempted to produce ceramic materials such as bricks, tiles and pellets. In view of low concentration level of metals, the tested dredged sediments can be used for land reclamation or filling purposes.

INTRODUCTION

Recent studies showed that sediments present in the harbours are often contaminated with pollutants from a wide range of agricultural, urban and industrial sources, and typical contaminants including toxic metals, organo-halogen and petrochemical products (Yong, 1995). Due to the potential toxicity and cumulative behaviour of heavy metals, there is a need to examine the pollutants concentration present in the marine sediments, and develop various disposal alternatives for dredged materials (Yarlagadda et al., 1995). Mohan et al. (1997) pointed out the beneficial use of dredged materials as barrier material in landfill cover, whereas a simplified solidification technique for hazardous wastes has been attempted by Parsa et al. (1996). Singapore is one of the world largest oil refining centers, and there are several industrial estates located at Johore, South Malaysia as well as northern coastal regions of Singapore such as Sembawang, Bedok and Tampiness (Cheong et al. 1994). Land reclamation is a major civil engineering activity and large reclamation projects are envisaged for the north east coast especially near Changi International Airport.

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