‘Nothing left behind’: How potato processors are turning waste, water and lost yield into new value

The next competitive advantage in potato processing may not come from running more tonnes through the factory. It may come from extracting more food, revenue and reusable material from every tonne already entering it.

By Lukie Pieterse, Editor and Publisher, Potato News Today

For much of the industrial era, potato processing performance was judged principally by throughput.

How many tonnes could a factory receive, peel, cut, cook, freeze and package in an hour? Could a line operate faster, with fewer stoppages and less labour? Could production be expanded sufficiently to meet growing demand?

Those questions remain important. But the economics of processing are changing.

Potatoes are becoming more expensive to produce. Water and energy are under growing scrutiny. Raw-material quality is becoming less predictable as heat, drought and excessive rainfall affect tuber size, dry matter, shape and internal quality. Labour is difficult to secure in many regions, while processors face stricter environmental obligations and more demanding corporate sustainability targets.

Under these conditions, greater throughput alone is not enough. A factory can process enormous volumes and still surrender value through excessive peeling, inaccurate trimming, unnecessary rejection, water losses, energy inefficiency and underused by-products.

The more revealing question is therefore no longer simply how many tonnes enter the plant.

It is how much useful value leaves it.

A one per cent improvement is no longer small

Yield loss in a processing plant can occur in tiny increments that appear insignificant when viewed at one point on the line.

A little too much flesh is removed during peeling. A sorter rejects acceptable product with defective material. Cutting equipment produces excessive fragments. Variability in tuber size reduces recovery. Starch and fine solids disappear into process water. Peel and offcuts are directed into low-value outlets without consideration of more profitable uses.

Individually, these losses may seem manageable. Across a facility processing hundreds of thousands of tonnes, they become substantial.

A one-percentage-point improvement in finished-product recovery means that one additional tonne of saleable product is obtained from every 100 tonnes of raw potatoes. At industrial scale, that can represent thousands of tonnes annually.

The value is not limited to the additional product. Those potatoes have already absorbed seed, fertiliser, crop protection products, water, diesel, labour, storage energy and transport. Recovering more usable food from them improves the productivity of every preceding input.

Yield optimisation is therefore both an economic and environmental strategy.

The raw material is becoming more variable

Processors have always handled variation, but climate volatility is increasing the challenge.

A single delivery may contain potatoes differing in size, shape, maturity, specific gravity, sugar concentration, bruising and internal defects. Growing-season stress can also influence how tubers respond during storage and processing.

Traditional machinery is commonly calibrated around a relatively predictable raw-material profile. When that profile changes, the plant may compensate by peeling more aggressively, rejecting more potatoes or accepting greater inconsistency in the final product.

This is expensive.

The processing line of the future will need to adapt continuously to the crop it is receiving. That means measuring raw-material characteristics in real time and adjusting operations before large volumes of product are lost.

The objective is not merely automation. It is crop-aware automation.

Imaging technology is seeing beneath the surface

Optical sorting has long helped processors identify colour defects, foreign material and misshapen products. The newer frontier involves combining artificial intelligence with imaging technologies capable of detecting characteristics that ordinary cameras—and human eyes—cannot easily distinguish.

Hyperspectral imaging measures reflected light across many narrow wavelength bands. Different chemical and physical characteristics create different spectral patterns, potentially allowing equipment to identify internal or early-stage quality problems without cutting every tuber open.

In January 2026, Lamb Weston was reported to be integrating artificial intelligence and hyperspectral imaging at its potato processing facility in Oosterbierum in the Netherlands. The project’s objective is to analyse potato quality in real time and enable quicker, more accurate production adjustments.

The commercial logic is straightforward. If a processor understands the incoming potato more precisely, it can make more informed decisions about peeling, cutting, sorting and product routing.

A particular lot might be suitable for one product specification but not another. Some defects may require removal, while harmless variation should not automatically condemn otherwise useful material.

Artificial intelligence can analyse complex imaging data rapidly, but it must be trained and validated carefully. A sorter that removes every questionable piece may protect quality while destroying yield. One that is too permissive may increase complaints or food-safety risks.

The aim is not maximum rejection. It is accurate rejection.

Peeling is becoming a precision operation

Peeling is one of the clearest examples of the tension between quality and yield.

Too little peel removal can leave skin, blemishes or defects that make the finished product unacceptable. Too much removes saleable potato flesh along with the peel.

Even small differences in peeling performance matter enormously at industrial scale.

Steam peeling has become important partly because it can separate peel efficiently while limiting flesh loss. Yet the operation still depends on variables such as potato size, shape, skin condition, steam pressure, exposure time and the effectiveness of peel separation afterwards.

Modern control systems can help processors adjust the treatment according to incoming crop characteristics rather than applying the same aggressive setting to every lot.

Dry peel separation is also receiving renewed attention. TOMRA Food introduced a higher-capacity dry peel separator in early 2026, designed to remove loosened peel after steam peeling without using water in that separation stage. According to the company, the equipment can handle up to 70 tonnes per hour.

Such technology matters for two reasons. It can help preserve processing yield, and it creates a more concentrated peel stream that may be easier to use as a raw material elsewhere.

Once peel becomes heavily diluted with water, extracting value from it becomes more difficult and energy-intensive.

Water is moving from consumable input to circulating asset

Potato processing is water-intensive.

Water may be used for receiving, fluming, washing, peeling, cutting, blanching, cooling and cleaning. It transports soil, starch, peel fragments and organic material through different parts of the facility.

Historically, abundant water and relatively inexpensive discharge allowed many plants to operate with largely linear systems: fresh water entered, performed a function and left as wastewater.

That model is becoming harder to justify.

Water availability is tightening in some regions. Municipal charges and discharge requirements are rising. Communities are scrutinising industrial water use more closely, particularly where agriculture, households and ecosystems compete for limited supplies.

The practical response is not necessarily to use the same water everywhere. Food safety and product quality require water of appropriate quality at each stage. The opportunity lies in matching treatment to intended reuse.

Relatively clean water from one operation may be suitable for an earlier, less sensitive stage. More contaminated streams may require screening, biological treatment, membrane filtration or reverse osmosis before they can be reused.

In 2026, Wyma Solutions launched a high-capacity self-cleaning filtration system for fresh-produce packhouses and processing facilities. The company reports that its Micron Filter XL filters particles down to 0.15 millimetres and can substantially reduce suspended solids and organic loading, enabling a greater proportion of water to be recirculated.

More advanced systems can go considerably further. Membrane bioreactors, activated-carbon polishing and reverse osmosis are already being combined in some large processing installations to produce water suitable for reuse.

The challenge is to avoid viewing water recycling as an isolated environmental project. It must be integrated with hygiene, microbiological control, product quality, chemical use, energy consumption and maintenance.

Saving water through a process that consumes excessive energy or creates difficult waste concentrates may merely shift the environmental burden elsewhere.

The starch in wastewater is still a product

Processing water does not contain only dirt. It can carry significant quantities of starch and fine potato solids.

When these materials remain in the wastewater stream, they increase biochemical and chemical oxygen demand, making the water more difficult and expensive to treat. But when recovered early and kept sufficiently clean, starch can become a useful co-product.

This changes the economics of separation.

Removing solids close to their point of origin can reduce the load on downstream wastewater treatment while creating a material potentially suitable for industrial starch applications, fermentation, animal feed or other uses.

The exact market depends on purity, consistency, food-safety status and local demand. Not every recovered stream will command a premium price.

Even so, the first principle remains sound: a material should not be classified as waste before its composition and possible uses have been properly examined.

Potato peel is becoming an industrial feedstock

Potato peel has traditionally been used in animal feed, composted, digested for biogas or disposed of as organic waste. Those outlets remain useful, particularly when they are local and economically practical.

New research suggests that peel may support a much wider range of applications.

Peel contains starch, cellulose, hemicellulose, pectin, fibre, phenolic compounds and suberin—a complex natural polymer that helps protect the tuber against water loss and biological attack.

A 2026 paper in Food and Bioproducts Processing described a sequential method for recovering phenolic compounds, starch and cellulose from potato peel. Instead of extracting one component and leaving another residual waste stream, the researchers investigated how several useful fractions could be recovered in sequence.

The recovered materials were then used in preservative films. In laboratory testing, these films demonstrated antimicrobial and ultraviolet-barrier properties and helped extend the shelf life of fresh-cut potatoes.

Another 2026 study published by the Royal Society of Chemistry investigated incorporating low-starch potato peel into starch-based composite films. The resulting materials showed improved strength, stiffness, water-vapour resistance, light-barrier performance and antioxidant activity.

Separately, researchers explored a water-based alkaline process for recovering suberin-derived compounds from industrial potato peel. These molecules may serve as renewable building blocks for polymer coatings and other materials.

These developments do not mean that every tonne of peel will soon become premium biodegradable packaging. Laboratory success is only the beginning.

Commercial viability will depend on:

Reliable peel supply and composition.
Efficient separation and drying.
Energy requirements.
Food-safety and chemical-safety controls.
Removal or management of naturally occurring glycoalkaloids.
Regulatory approval.
Performance compared with established materials.
Availability of stable end markets.
Transportation distance and processing scale.

Nevertheless, the direction is significant. Peel is no longer being studied only as a disposal problem. It is increasingly being examined as biomass with several potentially valuable components.

One by-product may support several markets

The traditional approach to by-product valorisation often searches for one outlet: convert peel to feed, recover starch or send organic material to an anaerobic digester.

The emerging biorefinery concept is more ambitious. It seeks to separate several fractions sequentially so that each is directed to its most valuable technically and commercially realistic use.

A future potato-processing biorefinery might recover:

Phenolic compounds for specialised antioxidant applications.
Starch for food or industrial use.
Fibre and cellulose for composite materials.
Suberin-derived molecules for coatings or polymers.
Protein-rich fractions for feed or ingredient applications.
Remaining organic material for biogas or fertiliser production.
Reusable water for return to the factory.

The sequence matters. Sending everything directly to energy recovery may generate useful biogas, but it can destroy the possibility of extracting higher-value compounds first.

The commercial principle resembles the use of timber. High-quality wood is not burned immediately if it can first become a building material. Energy recovery is generally reserved for residues that cannot be used more productively.

Potato processors may increasingly apply the same value hierarchy.

Not every circular-economy idea will make commercial sense

The language of “zero waste” can be misleading.

Separating, cleaning, stabilising and transporting by-products consumes equipment, labour and energy. Some proposed products exist only at laboratory scale. Others depend on niche markets too small to absorb the volumes generated by a large processing plant.

A process that converts peel into a technically impressive material may still fail if production costs are too high or customers prefer a cheaper conventional alternative.

Location also matters. A low-value wet by-product can become uneconomic if transported long distances because processors are effectively paying to move water.

The strongest projects are therefore likely to be those that:

Begin with a clearly identified market.
Use a consistent and concentrated by-product stream.
Minimise drying and transportation requirements.
Integrate with existing factory infrastructure.
Produce measurable savings or revenue.
Meet regulatory and customer requirements.
Remain viable without relying indefinitely on subsidies.

Circularity should not be measured by the number of experimental uses announced. It should be measured by durable, verifiable displacement of waste, virgin materials, water use or fossil energy.

Growers have a stake in processing efficiency

The recovery revolution is not only a factory issue.

Processing yield begins with the potato delivered by the grower. Size distribution, shape, dry matter, bruising, disease, hollow heart, sugar concentration and other characteristics influence how much finished product can be recovered.

Better factory measurement could create more precise feedback to growers and breeders. Instead of evaluating a variety primarily by field yield, the industry could assess saleable product recovered per hectare.

That metric may produce different conclusions.

A variety with slightly lower field yield but excellent shape, solids and defect resistance might generate more finished product than a higher-yielding variety that suffers substantial trimming and rejection.

This creates an opportunity for closer collaboration among breeders, growers, storage managers and processors. It also creates a responsibility to share value fairly.

If growers are asked to adopt varieties or practices that improve factory recovery, the economic benefit should not remain entirely within the processing plant.

The most sustainable potato is the one already grown

Much of the sustainability debate focuses on producing the next crop with fewer inputs. That work is essential.

But enormous value can also be gained by making better use of the crop already harvested.

Every kilogram of potato unnecessarily removed during peeling or wrongly rejected has already consumed land, water, fertiliser, labour, fuel, storage capacity and transport. Recovering that kilogram can sometimes deliver environmental benefits more quickly than expanding production elsewhere.

The future potato-processing plant will still be judged by food safety, product quality, reliability and cost. Increasingly, however, it will also be judged by how intelligently it uses the whole raw material.

The most advanced factories will not regard the finished fry, chip or flake as the only valuable output. They will see a network of food products, water loops, recovered ingredients, biological materials and energy streams.

That is the deeper shift now underway.

The potato is no longer simply entering the factory to be processed.

It is entering to be understood, separated and used as completely as practical—with less of its embedded value allowed to disappear down a drain or leave through the waste gate.