Company Overview

Doppstadt, based in Velbert, Germany, founded in 1965, has transitioned from agricultural machinery to a global leader in recycling and environmental technology. The company specializes in innovative, efficient, and cost-effective recycling solutions, particularly water-based separation and wet recycling systems, serving customers in over 40 countries.

Landfill Mining Applications

Landfill mining focuses on reclaiming land for construction by excavating and processing landfill materials. It increases landfill capacity by extracting valuable fractions such as Refuse Derived Fuel (RDF) from oversize (150–500 mm) and light fractions (50–150 mm), ferrous metals for recycling, and fines/heavy materials which are returned to the landfill. This process offers ecological benefits by remediating soil and groundwater and economic benefits through material recovery.

Landfill Mining Process Description

1. Spiral Shaft Separation (SWS or Splitter): Robust screening separates coarse and fine fractions and removes metals magnetically.
2. Trommel Screening: Further screens fine fractions to isolate midsize materials (50–150 mm) and remove fines.
3. Wind Sifting: Separates low-density materials like plastic films (light fraction) for energetic use.
4. Metal Separation: Extracts ferrous metals from fine and coarse fractions for recycling.
5. Fines Treatment: Mixes finest fraction (0–50 mm) with lime to stabilize material before returning it to landfill.

This process targets municipal waste landfills and excludes slag or mining tips.

Process Flow and Equipment

The workflow includes feeding, screening, metal separation, wind sifting, and fines processing. Key equipment comprises spiral shaft separators, trommel screens, wind sifters, magnetic separators, and mixers for lime addition. This ensures efficient recovery of valuable materials and responsible residual management.

Environmental and Economic Benefits

Landfill mining improves soil and groundwater quality, recovers metals and combustible materials, and frees land for construction or further waste disposal, enhancing both ecological and economic outcomes.

Overview of Landfill Mining and Waste Sorting Processes

The document details machinery and processes for landfill mining and waste sorting, emphasizing robust handling of heterogeneous materials to optimize landfill capacity and resource recovery.

1. Process Components and Machinery

• Sorting and Separation Technologies: Manual sorting, near-infrared sorting, eddy current separators, sink-float separation, spiral shaft separation, and wind sifting.
• Shredding Equipment: Includes low-speed, high-speed, slow-running, fast-running shredders, drum chippers, and splitters for size reduction.
• Screening Systems: Trommel screens, star screens, FlatFlex lines, and selector units (Selector 400, 800.2) for particle classification.
• Mixing and Homogenization: Mixers used to homogenize materials before further processing.
• Water Treatment and Combustion: Systems integrated for organic fraction handling and energy recovery.
• Rotting and Composting: Biological treatment via multiple rotting processes and composting units.

2. Process Flow and Integration

• Feeding and shredding landfill material.
• Separation of metals, plastics, organics, and inert materials using advanced sorting and separation technologies.
• Biological treatment of organics through rotting and composting.
• Water treatment for recycling process water.
• Final sorting and preparation for landfill reuse or material recovery.

3. Equipment Lines and Models

• AirFlex series (e.g., AirFlex 1500)
• WS series (WS 1001, WS 1501, WS 2001, WS 2501, WS 3001)
• DM 215 E
• Selector units (Selector 400, 800.2)
• Spiral shaft screen decks (SWS)
• SPLITTER units (325, 425, 625)
• FlatFlex and Star screen lines (DST)
• Shredders (SM series, SST series)

4. Benefits and Recommendations

• Robustness: Designed to handle highly heterogeneous landfill materials effectively.
• Return on Investment: Increases landfill capacity and recovers construction areas, providing economic advantages.
• Resource Utilization: Enables recovery of energy and materials, supporting sustainability goals.

5. Contact and Manufacturer Information

Doppstadt Umwelttechnik GmbH, Velbert, Germany. Contact: +49 2052 889-0, [email protected].

Note: Some repeated listings and placeholder text are present but do not affect the technical content.