Rope and wire residues, plastic films, fibre bundles and other lightweight rejects are produced continuously.

These materials are mixed, difficult to separate and prone to wrapping around rotating equipment.

As a result, many paper mills have traditionally relied on off-site transport, landfill or third-party waste disposal.

With stricter environmental requirements, rising landfill costs and fluctuating fossil fuel prices, more paper manufacturers are looking for cost-effective and sustainable alternatives.

One promising approach is to sort and pre-treat paper mill waste to produce refuse-derived fuel (RDF).

How can this approach create additional value for paper mills?

1. Reduce Waste Disposal Costs

Turn waste disposal expenses into an opportunity for energy recovery.

Traditionally, paper mills pay for waste collection, transport, landfill and third-party disposal. The larger the volume of waste generated, the higher the associated costs.

With an on-site RDF preparation system, suitable combustible waste can be processed into alternative fuel, reducing the volume requiring landfill or off-site disposal.

Ferrous metals recovered during sorting can also be sold for recycling, creating an additional revenue stream.

2. Reduce Dependence on Fossil Fuels

Use waste-derived fuel to help control energy costs.

Paper manufacturing is energy-intensive, with substantial demand for steam and electricity. Coal and other fossil fuels can account for a significant share of operating costs.

RDF produced from suitable paper mill waste can be used in compatible on-site boilers or supplied to other industrial users, subject to fuel specifications and equipment requirements.

Replacing part of the conventional fossil fuel supply with RDF can reduce coal consumption, improve resource efficiency and help paper mills manage exposure to fuel price fluctuations.

3. Create Additional Revenue Opportunities

Turn recovered waste into a marketable fuel product.

Paper mills do not have to use all the RDF they produce themselves. Where fuel quality and local market conditions permit, RDF can be supplied to cement kilns, industrial boilers and district heating plants.

This creates opportunities to generate additional revenue from waste that would otherwise require disposal, while improving the overall economics of waste management.

Harden Machinery's Integrated RDF Preparation System for Paper Mill Waste

Producing RDF from paper mill waste requires more than conventional shredding. Rope residues, long fibres and tangled plastics can easily wrap around cutting shafts, causing blockages and frequent downtime.

Inadequate separation can also leave non-combustible impurities in the fuel, reducing its quality and potentially damaging downstream equipment.

Harden Machinery's customised paper mill waste processing system is designed to address these challenges through an integrated process combining primary shredding, multi-stage separation and fine shredding.

The modular system is tailored to the characteristics of paper mill waste, helping convert mixed rejects into more consistent RDF feedstock.

1). Heavy-Duty Primary Shredding to Prevent Blockages

Harden Machinery's twin-shaft shear shredder delivers high torque to break down rope residues, long fibre bundles and other tangled materials.

The system reduces bulky waste to a particle size of less than 100 mm, making the material easier to handle and process in subsequent stages.

Its shredding design helps manage wrapping risks and reduce the frequent blockages and manual cleaning associated with unsuitable conventional shredders.

2). Efficient Separation to Remove Impurities

The separation stage combines technologies such as magnetic separation and air separation to remove ferrous metals and other unwanted materials, including stones and other non-combustible contaminants.

Recovered metals can be collected separately for recycling, while removing hard contaminants helps protect downstream shredders and fuel-handling equipment.

Effective separation also helps improve RDF quality by reducing unwanted impurities.

3). Single-Shaft Fine Shredding for Consistent RDF Quality

After separation, the combustible fraction enters a single-shaft fine shredder for further size reduction.

The system produces a more uniform output with a particle size below 100 mm, with an output qualification rate of over 95%, according to the stated system specifications.

The resulting RDF can achieve a calorific value of approximately 4,000–6,000 kcal/kg, depending on the composition and moisture content of the feedstock and the effectiveness of the pre-treatment process.

Consistent particle size and appropriate fuel quality help support reliable feeding and stable combustion in compatible energy recovery systems.

From Waste Management Costs to Resource Recovery

As waste recovery technologies become more widely adopted, replacing a proportion of fossil fuel with waste-derived fuel is becoming an increasingly attractive option for the paper industry.

Harden Machinery's paper mill waste processing system is designed around the specific challenges of this waste stream: material wrapping, impurity removal and output consistency.

By combining heavy-duty shredding, effective separation and controlled fine shredding, Harden Machinery helps paper mills establish a pre-treatment process tailored to their feedstock and fuel requirements.

The result: less waste requiring disposal, greater potential for energy recovery and new opportunities to improve operational efficiency.

With the right process and equipment, paper mill waste can become a valuable alternative fuel resource rather than an ongoing disposal expense.