Abstract
The municipal solid waste (MSW) landfill in Vientiane, Laos, which receives > 300 tons of waste daily, of which approximately 50% is organic matter, has caused serious environmental problems. This study was conducted to investigate the accumulated levels of heavy metals (HMs) (cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb), and zinc (Zn)) in water (surface and groundwater), soil, and plants between dry and wet seasons according to the standards of the Agreement on the National Environmental Standards of Laos (ANESs), Dutch Pollutant Standards (DPSs), and the World Health Organization (WHO), respectively. Although no impact of pollution on the surface water was observed, the levels of Cr and Pb in the groundwater significantly exceeded the basics of ANESs and WHO in both seasons. The pollution caused by Cd and Cu reached the eco-toxicological risk level in the landfill soils and its vicinity. The vegetable Ipomoea aquatica, which is consumed by the nearby villagers, was seriously contaminated by Cr, Pb, Cu, and Zn, as the accumulation of these toxic metals was elevated to much greater levels as compared to the WHO standards. For the grass Pennisetum purpureum (elephant grass), the quantities of HMs in all plant parts were extreme, perhaps due to the deeper growth of its rhizome than I. aquatica. This study is the first to warn of serious HM pollution occurring in the water, soil, and plants in the MSW landfill of Vientiane, Laos, which requires urgent phytoremediation. The indication of what sources from the MSW principally cause the pollution of HMs is needed to help reduce the toxicological risks on Lao residents and the environment in Vientiane as well.
Highlights
The management of municipal solid waste (MSW) is a challenge for the urban environment in many developing countries and is attributed to rapid population growth, unsatisfactory urbanisation, and undesireable economic growth
Ni was not detected in both G1 and G2 in the dry season, whilst Pb was not found in the wet season in
This study provided evidence of the serious pollution of the water, soils, and plants growing in the MSW landfill in Vientiane, Laos
Summary
The management of municipal solid waste (MSW) is a challenge for the urban environment in many developing countries and is attributed to rapid population growth, unsatisfactory urbanisation, and undesireable economic growth. Open dumping and unsanitary waste landfills are a pressing issue. The landfill is the principal place for solid waste dumping, which has resulted in serious environmental pollution and the spread of disease [2,3]. Leachate migration in open dumping sites is a dominant source of heavy metals (HMs) in surface and groundwater, soil, and plants [4,5,6]. If plants uptake HMs from polluted soil, there is a high possibility of HMs transferring to the human food chain through the consumption of vegetation or animals [7,8]
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