Solid waste management and bioelements in soil

Area of Science:

• Environmental Science
• Waste Management
• Soil Science

Background:

• Solid waste management presents challenges in controlling pollutant migration.
• Heavy metals in landfills and agricultural runoff pose environmental risks.
• Sustainable solutions are needed to mitigate pollution from waste and agricultural byproducts.

Purpose of the Study:

• To investigate heavy metal migration patterns below a landfill.
• To evaluate the efficacy of compost as a filter for pig slurry.
• To assess the potential of the filtered slurry-compost system as a fertilizer.

Main Methods:

• Analysis of total and leachable heavy metal concentrations in refuse and soil samples.
• Installation and operation of a pilot plant using compost-filled filter beds for pig slurry.
• Assessment of pollution reduction in slurry and nutrient enrichment of compost.

Main Results:

• Heavy metal concentrations were more variable in refuse than in soil.
• Leachable metal mobility in soil varied based on soil characteristics, but most metals remained immobile.
• Compost filtration significantly reduced pig slurry pollution load.
• The compost-fertilizer system showed potential for improving compost quality.

Conclusions:

• Heavy metals exhibit limited mobility in soil beneath landfills, with most remaining immobile.
• Compost filtration is an effective method for reducing pig slurry pollution.
• The compost-filtered slurry system offers a viable approach for fertilizer production, enhancing compost with nutrients.