Holmen endeavours to minimise its quantity of waste and to utilise the highest proportion possible. Waste taxes and landfilling costs necessitate cost-effective management. Waste is separated into categories at all the units. Employees and contractors receive regular training in waste-handling procedures.
As no production waste goes to landfill, the mill is not required to pay waste tax. All production waste (treatment plant gravel, precipitation sludge, green liquor sludge, ash and sludge from chemical flotation) is considered to have potential for use as a construction material in capping Holmen’s own landfill. As capping is a time-limited activity, several projects are in progress to find more long-term uses for the production waste. The recovery of precipitation chemicals, incineration with energy production and construction material for forest roads are just a few examples of how waste and by-products may be used.
Hallsta Paper Mill
The ash that arises in the burning of biofuels is largely used as construction material at Hallsta’s own landfill site, Ryadeponin. In 2013, the ash was used in landscaping Ryadeponin before it is finally capped. The ash is used under the sealing layer. Of the sludge that arose in the mill’s waste treatment in 2013, around 9 per cent was used for soil products and the remainder for the extraction of energy at the mill.
In 2013, the sludge dewatering plant at Hallsta underwent a major upgrade. Three worn, open belt filter presses were replaced with two new closed belt presses, accompanied by new control and transport systems. The new sludge filter presses became fully operational in 2013. The aim of the investment is more efficient and safer operating and work environment conditions at the plant. The sludge will now have a higher dry content than before.
Braviken Paper Mill
2013 saw significantly smaller quantities of recovered paper sludge and plastic rejects from recovered paper than in 2012, due to lower production levels. Amounts of ash and residues from flue-gas treatment sent to landfill were also lower. The lower quantities of ash were due to less incineration of recovered paper sludge, which has a high ash content. The lower quantities of flue-gas residues were due to the fact that Braviken now burns low-sulphur oil and it burns less oil than it used to. This has substantially reduced the need to treat sulphur emissions from oil using flue-gas treatment chemicals. The waste generated from flue-gas treatment and sent to landfill in 2013 was down to a third of the figure in 2012.
Holmen Paper Madrid
The amount of deinking sludge in 2013 was of the same order as in 2012. The sludge is principally used at present for agricultural purposes and for producing bricks.
The quantity of plastic rejects remained at the same level as in 2012.43 per cent of this type of waste was incinerated in 2013 and 3 per cent was recovered as metals.
Various projects ran in 2013 aimed at finding new uses for the by-products/waste.
The by-products/waste that arise in production can be classified into four categories:
Combustible by-products that are used
Mainly used to generate thermal energy at the mills or in external heating plants.
By-products for various uses
Several projects have been carried out in recent years to find alternative uses for the by-products and waste that are produced. Some materials, for example sludge from wastewater treatment plants, can be used as a soil improver after treatment. Incinerator ash has been used as a road-building material and soil improver, and to cap landfills.
Waste sent to landfill
As a result of legislation and efforts to find alternative uses, the volume of waste sent to landfill has fallen to the point where, for many years now, it has accounted for less than 1 per cent of the by-products and waste generated by Holmen’s operations.
Hazardous waste consists of materials such as waste oils, chemical residues and fluorescent tubes. Hazardous waste is dealt with by an authorised collection and recovery contractor. Certain fractions of the waste are recovered. Other fractions are destroyed under controlled conditions. Oil-containing waste from docking ships is dealt with at port facilities at three Holmen mills. The waste is treated as hazardous waste.