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.
The partnership that has been ongoing since 2015 with Stena Recycling AB continued in 2016, which has responsibility for all management of waste and recycling as well as sediment management. Stena's responsibilities also include maintenance of the landfill and ongoing capping of the oldest part of the mill's landfill which should be completed in 2018.
During 2016 the work proceeded according to the approved termination plan for the landfill and production waste (green liquor, chemical sludge, sludge from the chemical flocculation, ash, etc.) has been used as construction material at the capping.
The partnership also includes finding long-term solutions for 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
Amounts of waste were considerably lower in 206 than in 2015. The largest amounts of waste in 2015 were generated in the recovered fibre process, in the form of sludge and plastic rejects. Braviken stopped producing recovered fibre material in 2015 due to a change of product mix. This led to a sharp reduction in volumes of waste.
The amount of ash is also significantly down, due to Braviken no longer burning recovered paper sludge, which had a high ash content.
Efforts to improve waste separation at Braviken in cooperation with the waste contractors continued in 2016. This has led to improved quality in the various waste fractions.
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.