No matter what kind of waste has to be dealt with – DAW Stoffstrom GmbH will find a proper and advantageous disposal route. Most types of waste can be handled in own facilities within our group of companies. For all other wastes DAW Stoffstrom GmbH can use facilities operated by companies cooperating with DAW Stoffstrom GmbH on a partnership basis. DAW Stoffstrom GmbH’s customers mainly generate the following types of waste:
Soil/construction waste/mineral waste
With regard to soil/
- soil and construction waste from contaminated sites that are classified according to the rules of the Working Group of the German Federal States on Waste (Länderarbeitsgemeinschaft Abfall, LAGA) or according to the Landfill Ordinance (Deponieverordnung).
- slags
- return foundry sand
- asphalt demolition material
Depending on their condition and degree of pollution these materials are either recycled – e.g. in building material recycling, landfill construction and backfilling of obsolete mines – or treated in soil treatment facilities or thermal treatment facilities. If the materials can neither be recycled nor treated another option is a proper and safe deposition in an above-ground or underground landfill.
Shredder waste
DAW accepts shredder waste from metal and scrap processing plants with shredders, scrap mills and metal cutting machines:
- shredder light fractions, classic (unscreened)
- shredder coarse fractions
- shredder fine fractions/shredder sands
- waste from the processing of shredder heavy fractions (plastics, rubber)
- sand residues from scrap shears
Depending on the composition of the material, grain size/fragmented size and chemical properties the waste is either transported to treatment facilities to produce fractions that are suitable for long-term deposition or have a high calorific value or is directly used in plants for thermal recovery.
Bituminous and tarred waste
DAW collects bituminous and tarred waste from temporary stores or directly from constructions sites, namely
- tarred roofing felt
- bituminous roofing felt
- tarred asphalt (in milled or block form)
- bituminous asphalt
Depending on the rules and regulations in force in the specific Federal State this waste is either treated, thermally recovered or deposited in landfills.
Industrial cleaning residues/street cleaning residues
Street cleaning in municipalities and cities and cleaning of industrial areas produces sweepings. DAW as a specialized waste management company is a partner of municipalities, third party service providers and industrial enterprises. These sweepings are treated – either by composting or by soil treatment – and subsequently recycled or thermally recovered.
Construction waste/commercial waste/residues from sorting
Sortable fractions from
- commercial waste
- household-type commercial waste
- construction waste
- bulky waste
- residues from sorting
are supplied by DAW for treatment/sorting or, as the case may be, directly used in thermal recovery plants. Sieved mono-fractions according to the German Commercial Waste Ordinance are recycled according to the rules and regulations.
Production waste
Based on condition and recoverability DAW examines
- solid
- powdery
- and liquid
production waste to decide whether to recycle or use them as a source of energy to produce refuse derived fuels.
Sieve fractions
In a number of waste treatment plants sieve fractions are generated that can be disposed of by DAW. They result for example from
- commercial waste sorting
- building and demolition waste sorting
- DSD sorting (Duales System Deutschland)
They may also be
- shredder fine fractions/
shredder sands
Depending on the material composition, grain size, analysis results (in particular the organic pollution found) this waste is disposed of in RDF reprocessing plants, mechanical-biological facilities, thermal recovery facilities, or composting facilities, or is supplied to soil treatment or landfills.
Reusable materials/secondary raw materials
DAW gives top priority to making good use of resources and to promote sustainability wherever possible. As an example, the following reusable materials are collected using customized logistics solutions and supplied to recycling – in packed form or as bulk material:
- plastic material of any kind
- metals
- paperboard, paper, cartons
- glass
- textiles
Substitute fuels
Fractions with a high calorific value obtained from
- production waste
- commercial waste
- construction waste
- packaging waste
- domestic waste
- residues from sorting
- bulky waste
are ideally suited to produce substitute fuels for thermal recovery. DAW is both a supplier for producers and a producer of substitute fuels within our group of companies.
Combustion residues
During thermal processes in incinerators for domestic waste and hazardous waste, coal-fired power plants, RDF power plants, cement mills or wood-fired CHP plants different types of combustion residues are generated which are either disposed of as waste or used again as a product.
This includes:
- slags
- ashes
- dusts
- salts
- hydrochloric acids
- gypsum wastes
- bypass dusts
- filter cake
- metallurgical debris
- furnace linings
Depending on the type of waste different disposal routes are available, such as backfilling of obsolete mines, landfilling, treatment/processing or recycling.
Solid and liquid hazardous waste
All types of classic hazardous waste can be recycled or permanently removed by DAW. The wastes are collected as bulk material, in Big Bags, intermediate bulk containers (IBC), waste containers for solid and pasty substances (ASP), special waste container for liquid substances (ASF), in bulk or with tank trucks and disposed of in the appropriate way, for example by
- chemico-physical treatment
- production of substitute fuels
- recycling
- combustion of hazardous waste
- combustion of domestic waste
Municipal and industrial sewage sludges
Municipal sewage sludges are disposed of by DAW for example by
- composting
- use in recultivation projects
- soil treatment
- thermal recovery (waste incineration plant, sweepings incineration plant, cement mill, coal-fired power plant)
Industrial sewage sludges are supplied to
- chemico-physical treatment
- backfilling of obsolete mines
- thermal recovery (waste incineration plant, sweepings incineration plant, cement mill, coal-fired power plant)
Organic wastes
Organic wastes are mainly recycled by means of composting or use in biogas plants. They include wastes such as
- sewage sludges
- green waste
- waste timber
- residues from sieving processes in mechanical-biological facilities and composting facilities
- sewage sand
- production waste
- waxes and fats
- coal
- coke
Depending on their condition and the analysis results it is possible to use them as a product.
Waste timber
DAW cooperates with timber processing plants and wood-fired CHP plants and supplies different qualities of waste timber to processing or thermal recovery. The following waste wood categories and fractions are accepted
- waste wood category I
- waste wood category II
- waste wood category III
- waste wood category IV
- stumps
- residues from wood sieving (oversize/undersize)
Mono sorting waste
Mono sorting waste is generated on construction sites during pre-sorting of construction waste, in commercial enterprises during sorting or during the treatment of commercial waste/construction waste/bulky waste. In this area DAW disposes of
- waste wood
- used tires
- asbestos
- roofing felt
- plastics
- paperboard, paper, cartons
- plasterboard waste
- carpets and mattresses
- insulating material, artificial mineral fibres (AMF)
- glass fibre reinforced plastic (GFRP)/carbon fibre reinforced plastic (CFRP)
- metals
These mono-fractions are recycled and returned to the economic cycle. Where this is not possible DAW ensures a recycling method that is sensible both from an ecological and an economical point of view.
Plastic
Waste plastics from households and industrial enterprises are
- sorted
- washed (flake production)
- re-granulated
and used to produce new items.