Scientific article
English

Leachates draining from controlled municipal solid waste landfill: Detailed geochemical characterization and toxicity tests

Published inWaste management, vol. 55, p. 238-248
Publication date2016
Abstract

Management of municipal solid wastes in many countries consists of waste disposal into landfill without treatment or selective collection of solid waste fractions including plastics, paper, glass, metals, electronic waste, and organic fraction leading to the unsolved problem of contamination of numerous ecosystems such as air, soil, surface, and ground water. Knowledge of leachate composition is critical in risk assessment of long-term impact of landfills on human health and the environment as well as for prevention of negative outcomes. The research presented in this paper investigates the seasonal variation of draining leachate composition and resulting toxicity as well as the contamination status of soil/sediment from lagoon basins receiving leachates from landfill in Mpasa, a suburb of Kinshasa in the Democratic Republic of the Congo. Samples were collected during the dry and rainy seasons and analyzed for pH, electrical conductivity, dissolved oxygen, soluble ions, toxic metals, and were then subjected to toxicity tests. Results highlight the significant seasonal difference in leachate physicochemical composition. Affected soil/sediment showed higher values for toxic metals than leachates, indicating the possibility of using lagoon system for the purification of landfill leachates, especially for organic matter and heavy metal sedimentation. However, the ecotoxicity tests demonstrated that leachates are still a significant source of toxicity for terrestrial and benthic organisms. Therefore, landfill leachates should not be discarded into the environment (soil or surface water) without prior treatment. Interest in the use of macrophytes in lagoon system is growing and toxic metal retention in lagoon basin receiving systems needs to be fully investigated in the future. This study presents useful tools for evaluating landfill leachate quality and risk in lagoon systems which can be applied to similar environmental compartments.

Keywords
  • Municipal solid waste
  • Landfill leachate
  • Tropical conditions
  • Toxic metals
  • Ecotoxicity test
  • Risk assessment
Citation (ISO format)
MAVAKALA, Bienvenu K. et al. Leachates draining from controlled municipal solid waste landfill: Detailed geochemical characterization and toxicity tests. In: Waste management, 2016, vol. 55, p. 238–248. doi: 10.1016/j.wasman.2016.04.028
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN0956-053X
650views
6downloads

Technical informations

Creation05/11/2016 7:09:00 PM
First validation05/11/2016 7:09:00 PM
Update time03/15/2023 12:20:26 AM
Status update03/15/2023 12:20:25 AM
Last indexation10/31/2024 3:22:14 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack