Methods

The disposal facilities belonging to the DAW group offer all current methods to treat, recycle and dispose of waste.

Mechanical-biological treatment

  • Processing of domestic waste and of household-type industrial and commercial waste
  • Separation of metals and high-calorific elements for energetic recovery. After treatment the fraction destined for landfilling shows a very small residual biological activity and is then deposited.
  • Production of substitute fuels using the Stabilat process: Dewatering through biological means, followed by processing the mixture into reusable fractions such as substitute fuels and metals

 

Chemico-physical treatment

  • Conversion of mainly liquid hazardous waste by means of chemico-physical reactions
  • Hazardous substances are destroyed or converted into non-hazardous substances so that they can then be recycled or disposed of in an environmentally sound manner

 

Soil treatment

  • Treatment of all kinds of mineral waste
  • Dry mechanical processing by means of breaking, sieving, grading and separating
  • Soil biological treatment followed by recycling
  • Production of substitute building material which is then used in building projects
  • Recycling or disposal of treated fractions in landfills or by thermal soil treatment

 

Soil washing

  • Treatment of waste such as soils and construction waste contaminated with organogenic and heavy metals, residues from grit chambers, abrasives, dredged material, contaminated sludges, landfill leachate, or track ballast by means of chemico-physical soil washing
  • The harmful substances are removed by scrubbing, concentrated and then disposed of
  • Washed fractions can be recycled

 

Solidification

  • Solidification and stabilization of waste aimed at non-harmful recycling or landfilling
  • Immobilization of the harmful contents

 

Sorting and recycling of construction, commercial, industrial, bulky and household waste

  • Sorting of waste fractions with the aim to recycle as much as possible
  • Direct recycling of mono-fractions
  • Further processing of sorting residues, if required
  • Thermal recovery of residues that cannot be recycled

 

Production of substitute fuels

  • Separation of high-calorific substances from suitable types of waste to use them as fuels in various thermal recycling facilities
  • Pre-treatment by means of crushing, stabilization, grading etc. of waste that cannot be used directly because of its condition

 

Plastics recycling

  • Sorting of mixed fractions
  • Washing, milling and flake production
  • Regranulation
  • Production of new articles from recycled material

 

Treatment of bio-waste/composting

  • Treatment of all kinds of organic waste
  • Production of organic fertilizers from compost or fermentation residues
  • Production of biogas by means of fermentation

 

Processing and treatment of waste wood

  • Waste wood is a valuable resource that can be recycled or energetically recovered
  • Waste wood of any category is separated, foreign matter is removed and the wood is cut up
  • Based on suitability the wood is used to make derived timber products
  • Use of shredded wood and wood chippings as high-quality fuel for biomass thermal power plants or combined heat and power plants

 

Thermal recovery

takes place in

  • Waste incinerators
  • Hazardous waste incinerators
  • Thermal soil treatment facilities
  • Sewage sludge incinerators
  • Power stations
  • Cement mills

 

Intermediate storage

  • Temporary storage of waste
  • In particular including hazardous waste
  • In order to optimize transport units or during waiting times for available plant capacities

 

Backfilling of obsolete mines

  • Placing suitable waste into underground cavities to protect the surface above
  • For mineral wastes, dusts, sludges and liquids that are suitable regarding building physics and chemical composition

 

Landfilling

  • Important waste management option for wastes whose removal is mandatory (such as asbestos, insulating material) or if all recycling options have been exhausted
  • Waste removal to safe landfills in line with the applicable dump categories DK0 to DK III