Assessment of the impact of an open dumpsite on the surface water quality deterioration in Karadiyana, Sri Lanka


Koliyabandara SMPA, Asitha CT, Sudantha L, Siriwardana C. Assessment of the impact of an open dumpsite on the surface water quality deterioration in Karadiyana, Sri Lanka. Environmental Nanotechnology, Monitoring & Management [Internet]. 2020;14:100371.


Landfill leachate has created significant environmental issues throughout the world. Most of the developed countries have strict guidelines for the management of solid waste landfills as opposed to the open waste dumps commonly used in developing countries. Karadiyana is an open dumpsite which is in operation for nearly 20 years, located in the Western Province of Sri Lanka with a total area of about 25 acres. This open dumpsite is located very close to the Weras Ganga - Bolgoda Lake wetland system. A small stream known as Meda Ela runs parallel to the site A of the dump receives landfill leachate as overland flows and as leachate contaminated groundwater polluting its waters. Meda Ela intercepts the Weras Ganga - Bolgoda Lake adjacent to the dumpsite and delivers most of its polluted waters to the lake. In this paper, the water quality of Meda Ela and two ground water monitoring wells were investigated to assess the impact of the dumpsite on water quality deterioration. Water quality parameters; electrical conductivity (EC), pH, ORP, dissolved oxygen concentration, total dissolved solids (TDS), ammonia, nitrate, Cu, Mn, Fe, Zn, Cr and Cd were studied over two years. Investigational analysis of experimental data was carried out with principal component analysis, box plots, and ANOVA to identify the degree of water quality deterioration. Comprehensive pollution index method has been carried out with eleven (11) water quality parameters to determine the overall water quality of Meda Ela which categorized its water as moderately polluted water. PCA was used to identify four principal components demonstrating 89.8 % cumulative variance. The concentration of ammonia, nitrate and phosphate in monitoring wells were significantly higher with average values 346 ± 39 mg L−1, 151 ± 48 mg L−1 and 62 ± 11 mg L−1 respectively.