A laboratory-scale phytocover system for municipal solid waste landfills.

Area of Science:

• Environmental Science
• Waste Management
• Bioremediation

Background:

• Municipal solid waste (MSW) generation is rapidly increasing in developing countries, posing significant management challenges.
• Landfilling, a common disposal method, results in detrimental leachate and landfill gas (LFG) emissions.
• Plant-soil based cover systems (phytocovers) are being explored to mitigate these negative impacts.

Purpose of the Study:

• To evaluate the efficacy of locally available plants for phytoremediation of landfills.
• To assess the reduction in trace element contamination and LFG oxidation using a plant-soil cover system.
• To investigate the role of plant root zones in managing MSW.

Main Methods:

• A laboratory-scale experimental setup (1 m³ volume) was designed using 100 kg of MSW topped with a 30 cm soil layer.
• Locally available plant species were employed to establish a phytocover over the MSW.
• Trace element remediation and LFG oxidation were assessed by comparing initial and final parameters.

Main Results:

• Plant species developed robust root zones, significantly reducing water infiltration into the waste mass.
• A notable reduction in LFG emissions was observed: 11.12% in the deep zone, 54.38% in the root zone, and 32.12% in the topsoil zone.
• Microbial activity influencing soil chemical characteristics was identified as a key factor.

Conclusions:

• Phytoremediation using indigenous plants is a viable strategy for reducing landfill gas emissions and improving waste management.
• The development of a strong root zone by plants is crucial for limiting water infiltration and enhancing remediation.
• Understanding microbial roles is essential for optimizing phytocover designs for various climatic conditions in India.