Circular economy in a manufacturing plant does not mean that the company suddenly stops producing waste. It is about something more practical: ensuring that fewer materials, less energy and less water are lost from the process forever. The fewer losses along the way, the lower the costs, the less waste and the fewer resources that need to be constantly purchased from external sources.
In a manufacturing context, the logic behind this is quite straightforward. A factory consumes raw materials, utilities and energy; some of this value is then converted into a product, whilst some is lost. The circular economy begins when a company stops viewing these losses as inevitable and starts examining what can be recycled, recovered or reduced right at the process stage.
A closed-loop system starts with losses, not slogans
In many companies, the concept of a closed-loop system is immediately associated with recycling. This is only part of the picture, and not always the most important part at that. It makes much more sense to first identify where the plant is losing the most. Sometimes this will be material waste, sometimes excess water consumption, and sometimes process heat that is simply escaping from the process.
This is important because not every waste stream can be recycled with the same degree of success. If a company produces large quantities of homogeneous offcuts, scrap or process waste with consistent characteristics, the matter is relatively straightforward. However, if the waste is mixed, of inconsistent quality or contaminated, recycling it quickly ceases to be cost-effective.
In practice, the best results are achieved not so much by ‘managing waste’ at a later stage, but by reducing it at an earlier stage. If a process can be set up to generate less waste, this usually yields greater benefits than even the most sophisticated end-of-line recovery system.
What can actually be shut down at a production plant?
People usually think of materials first, and that is a natural starting point. Production waste, offcuts, dust, used packaging and substandard products often still have value, but it is necessary to assess whether they can be reused in the same process, in a different process, or sold as secondary raw materials. This depends on the industry, the quality of the material and the scale of production.
Another area that is often underestimated is energy. In many plants, a significant amount of heat is lost in a completely passive manner: through cooling systems, hot media, process installations, compressors, furnaces or dryers. If this heat stream can be captured and used elsewhere, the closed-loop system ceases to be merely an environmental slogan and becomes a simple matter of cost optimisation.
The same applies to water. In some processes, it makes no sense to use fresh water at every stage if, after appropriate pre-treatment, it can be returned to the auxiliary circuit. Of course, this will not always be possible. It all depends on the process’s quality requirements, the risk of contamination and the cost of treatment. But it is precisely here that one can often see whether a company approaches the issue technically or merely pays lip service to it.
Typical closed-loop systems in a plant
| Area | What can be done | Where does it usually make sense? | The main limitation |
|---|---|---|---|
| Materials | Recycling waste back into the process or external recovery | Processes involving homogeneous waste | Quality and purity of the material |
| Energy | Waste heat recovery | Systems with high heat loss | The cost of integration into the process |
| Water | Partially closed circuits, pre-treatment | Washing, cooling, auxiliary processes | Required water quality |
| Packaging | Reuse or modification of the packaging system | Internal logistics and regular deliveries | Circulation management |
| Production | Reducing waste and losses at source | Virtually every business | The need for technological change |
One thing is clear from this overview: a closed-loop system does not begin with the construction of additional infrastructure, but with understanding where value is being lost in the first place. In one facility, material waste will be the key issue; in another, it will be water; and in yet another, it will be energy. There is no one-size-fits-all solution.
That is why the worst thing you can do is to implement trendy solutions without assessing the scale of the issue. If a particular waste stream accounts for only a small proportion of costs and has limited recovery potential, the whole implementation may look good only on paper.
Where do companies most often miss the mark?
The first problem arises when a closed-loop system is treated as a separate ‘green’ project rather than an integral part of production. In such cases, solutions are tacked on as an afterthought, rather than being driven by the plant’s technology and organisational structure. Such a system usually performs poorly because it has not been built around the actual production process.
The second mistake is overestimating the value of waste. Just because something can be recovered does not necessarily mean that it makes economic or technological sense. Some recovered materials have inferior properties, some require costly processing, and some are so unstable that they complicate production rather than streamline it.
The third issue is the most practical. There is a great deal that could be done in many plants, but there is a lack of data. The company does not know exactly how much material it loses, how much process water costs, where energy is being wasted, or what percentage of rejects is returned to the process as a real cost. Without this information, a closed-loop system remains a general concept rather than a management tool.
Summary
A circular economy in a manufacturing plant only makes sense if it is based on technology, data and actual processes, rather than simply the slogan of ‘recovery’. First, you need to identify where the plant is actually losing materials, energy and water. Only then can you sensibly assess what is worth putting back into the cycle and what is better reduced at source.
