This article explains what residual flows are, how they arise, and why it pays to take them seriously—both financially and strategically.
What is a residual flow?
A residual stream is a material stream that arises as a byproduct of a business process and is not included in the primary product. It may be:
- Production waste – excess material from cutting, casting, or machining
- Rejected products – defective items, returns, or products that do not meet requirements
- Process residues – slag, ash, sludge, or filter cake generated during purification or incineration
- Packaging waste – pallets, packaging, or cardboard
- Demolition and construction materials – concrete, brick, wood, and metal from renovations or demolition
What all waste streams have in common is that they have inherent value—they contain raw materials, energy, or functionality that can be recovered if handled properly.
Why are residual flows ignored—and what is the cost?
The most common reason is simple: historically, waste materials have been viewed as acost center, not as an asset. You pay for transportation and disposal, and then it’s forgotten.
That is a costly approach. In addition to the direct costs of waste management, there are also:
- Wasted material value – raw materials you’ve already paid for are thrown away
- Increased environmental impact – landfilling and incineration weigh on your sustainability report
- Regulatory risk – EU requirements for material recycling are becoming increasingly stringent
- Lost revenue – sorted and clean waste materials have a market value
For a medium-sized manufacturer, the costs associated with poorly managed waste streams can amount to hundreds of thousands of kronor per year—sometimes even more.
| The materials you pay to dispose of today could be a source of revenue tomorrow. |
What determines whether a residual flow has value?
Three factors determine the value of a residual flow:
1. Purity– Mixed materials are difficult to sell, but sorted and clean materials have market value. A steel fraction free of plastic and organic matter is worth money; a mixed residue is a cost.
2. Volume– Recyclers and processors operate on a large scale. The more consistent and predictable a stream is, the easier it is to sell it or find an industrial partner.
3. Processing level– The more the material has been processed (crushed, screened, magnetically separated), the higher the price. Norditek helps customers transform their waste material from raw material into a marketable product.
From Cost to Resource – A Material Test Is the First Step
Knowing that you have a residual stream is one thing. Understanding what it actually contains, how it behaves during sorting, and what it can be turned into—that requires a test.
Norditek offers material testingat Our in Fjärås. We accept a sample of your waste material, run it through the relevant analyses, and provide you with a clear picture of:
- Composition of the material and any impurities
- Which process is most effective for your specific fraction
- What market value the sorted material might have
- Which equipment or system solution is right for your volume and workflow
The test is the fastest way to move from guesswork to fact-based decisions.
Take control of your inventory flow
Waste streams aren’t a necessary evil—they’re a part of your business that deserves just as much attention as your raw materials. With the right management, they can reduce costs, improve your sustainability, and create a new revenue stream.
Want to know what your scrap material can be turned into? Contact us for a material test — we’ll get back to you within 24 hours.



