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.
Holmen's cooperation with Stena Recycling AB began in 2015 and has continued in 2016 and 2017, with Stena taking responsibility for all handling of waste and recycling as well as sediment treatment. Stena's responsibility also includes landfill management and the final covering of the older part of the company's landfill, which is currently in progress and will be completed in 2018.
In 2017 the work has run according to the agreed phase-out plan and decreasing amounts of production waste (green liquor sludge, chemical sludge, precipitation sludge, ash, etc.) have been used as construction material in the final covering process. In late 2017 the terracing of the landfill site was completed and green liquor sludge was no longer needed in the final cover. Green liquor sludge is now sent to landfill, as stated in the company's permit.
The cooperation agreement also includes finding long-term solutions for managing/disposing of production waste.
Over 99 per cent of the Workington Mill's waste is recovered or recycled, and there is no process waste to landfill.
As far as possible, waste streams are segregated at source. For example, the bark removed from incoming roundwood logs is recovered and can be burned, the effluent cake is recovered for agricultural applications, and ash from the biomass boiler is also be recovered for agricultural use.
A local recycling company is contracted to ensure other types of waste are handled appropriately, whether it is paper waste generated in the offices or used parts from routine plant maintenance activities. Employees are trained in waste handling procedures as part of the mill's environment management system. All waste removed from site is recorded along with its destination.
Hallsta Paper Mill
Bark from the process is currently sold to external heating plants. This business has been continuously developed since the mill's own boilers were closed down.
Sludge arising from the mill's wastewater treatment is composted in-house to produce fibre soil reinforcement. The fibre soil reinforcement is mostly used externally for construction earth. Some of the product is also used to cap the mill's own landfill and for external burning.
The ash previously created when biofuels were burned at the mill has been stored and is used as a construction material to cap the mill's own landfill. The ash is used under the sealing layer.
Braviken Paper Mill
Fibre sludge from the mill's water treatment plant is composted to make fibre soil reinforcement in partnership with Econova. The soil reinforcement is used as a raw material in soil manufacturing and partly replaces peat in soil production.
Bark from the process and other biofuels are used for energy recovery in Braviken's solid fuel boiler, which provides the mill and Braviken Sawmill with thermal energy. Some bark and shavings are also sold to external heating plants.
Ash from the combustion of biofuel is used as construction material in creating and maintaining operational areas at Holmen's own landfill site.
Waste arising in operations is sorted and recycled or sent for energy recovery. A very small proportion is sent to landfill.
The by-products/waste that arise in production can be classified into four categories:
Combustible by-products/waste that are mainly 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 comprises 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.