Summary of Abstract Submission

Abstract Submission No. IO50-03-0056PresentationPoster

LANDFILL SITES ALONG NARROW COASTAL CREEKS OF MUMBAI, INDIA AND THEIR INFLUENCE UPON SEDIMENTARY HYDROCARBON LEVELS

Ananya Ashok*1, P. K. Pandey2, B. G. Naik1, Mahua Saha1

1 CSIR-National Institute of Oceanography, India
2 ICAR-Central Institute of Fisheries Education, India

ABSTRACT :

The coastal environment of Mumbai is under severe ecological stress due to anthropogenic activities. The Coastal Regulation Zone (CRZ) Notification, 2011 has designated the coast of Greater Mumbai as a critical coastal environment. Since, coastal sediments are sinks for pollutants of terrestrial origin they serve as good proxies for understanding anthropogenic influence upon such environments. This study deals with characterization of total organic carbon (TOC) and non-aromatic hydrocarbon concentrations from surface sediments of Thane, Manori and Vasai Creeks in Mumbai. TOC was calculated as difference of total carbon estimated by C,H,N, S Elemental Analyzer and total inorganic carbon by coulometry. n-alkanes ranging from carbon number 12-35 were identified and quantified using GC/MS. Percentage of TOC concentration ranged from 1.02 to 2.37% and n-alkanes varied from 2115 to 15663.3 ng g-1 dry weight of sediment. A comparison of the levels of n-alkanes from the three creeks showed large spatial variation. Highest levels of n-alkanes and TOC were found in Thane creek, notably closer to landfill sites. Thane creek has lower buffering capacity for pollution as compared to Vasai creek which is a well flushed estuary. The tidal flushing effect in Thane creek is probably reduced due to land reclamation and higher effluent discharge. Sampling sites near the Gorai closed landfill in Manori Creek showed intermediate levels of hydrocarbons between Thane and Vasai creek. Hence, scientific closure of landfill sites clustered near Thane creek might aid in restoration of ecosystem health as seen in case of Manori creek. Identification and management of pollution sources in vulnerable coastal creeks is essential for ecological conservation of Mumbai┐s CRZ.