Solid Waste Disposal Methods: Landfills & Incineration Explained

Solid waste management follows a hierarchy prioritizing reduction, reuse, and recycling before disposal. Final disposal methods vary by region, regulation, and infrastructure.

Waste Management Hierarchy (EPA/EU)

Most Preferred → Least Preferred
Source Reduction → Reuse → Recycling/Composting → Energy Recovery → Treatment/Disposal

Disposal Methods Comparison

Method	Process	Pros	Cons	Best For
Sanitary Landfill	Engineered cells, liner, leachate collection, gas capture, daily cover	Low cost; high capacity; handles mixed waste	Land use; methane (GHG); leachate risk; long-term liability	Non-recyclable, non-hazardous residual waste
Incineration (WTE)	Combustion 850-1200°C; energy recovery; flue gas treatment	Volume reduction 90%; energy generation; pathogen destruction	High capital; air emissions (dioxins, metals); ash disposal; public opposition	Dense urban; high calorific waste; land scarcity
Recycling	Sort, process, remanufacture	Resource conservation; energy savings; jobs; circular economy	Contamination; market volatility; downcycling; not all materials	Paper, cardboard, metals, PET/HDPE, glass
Composting/AD	Aerobic/anaerobic decomposition	Soil amendment; methane capture (AD); diverts organics	Odor; space; contamination; slow	Food waste, yard waste, agricultural
Waste-to-Energy (Advanced)	Gasification, pyrolysis, plasma arc	Lower emissions; syngas/fuels; smaller footprint	Unproven at scale; high cost; technical complexity	Emerging; niche applications
C&D Recycling	Crush, screen, separate	High diversion; aggregate replacement	Sorting cost; contamination	Concrete, asphalt, brick, metal, wood

Modern Landfill Engineering

• Composite liner: clay + HDPE geomembrane
• Leachate collection → treatment (on-site or POTW)
• Landfill gas collection → flare or beneficial use (electricity, RNG, CNG)
• Final cap: low-permeability layer, drainage, vegetation
• Post-closure care: 30+ years monitoring

Incineration Emissions Control

• Dioxins/furans: <0.1 ng TEQ/Nm³ (EU) / MACT standards (US)
• Acid gases: scrubbers (lime, sodium bicarbonate)
• Particulates: baghouse filters
• NOx: SNCR/SCR
• Mercury: activated carbon injection
• Continuous emissions monitoring (CEMS) required

Emerging Approaches

• Chemical recycling: Depolymerization to monomers (plastics)
• Extended Producer Responsibility (EPR): Manufacturer-funded end-of-life
• Zero waste certification: 90%+ diversion (TRUE, UL)
• Circular economy policies: EU Circular Economy Action Plan, US National Recycling Strategy

Decision Factors

• Waste composition & quantity
• Land availability & cost
• Energy prices & policy incentives
• Environmental regulations
• Community acceptance
• Lifecycle cost analysis

Integrated systems combining recycling, organics diversion, WTE for residuals, and minimal landfilling achieve best environmental and economic outcomes.