Innovative Uses of Whey in Food and Beverage Industries

Every year, the global dairy industry generates hundreds of millions of tonnes of whey – the greenish-yellow liquid left behind after milk is curdled during cheese, paneer, or casein production. For decades, this byproduct was treated as waste, dumped into drains or fed to livestock. Today, whey has emerged as one of the most versatile raw materials in the food and beverage sector. Thanks to advances in processing technology and a growing understanding of its nutritional value, whey is now transformed into high-value products ranging from protein supplements and infant formulas to refreshing beverages and bakery ingredients.

Why whey utilization matters 🔗

Whey contains about 93-94% water, but the remaining solids are nutrient-dense – packed with high-quality proteins, lactose, water-soluble vitamins, and essential minerals. The problem is that when whey is discarded untreated, it becomes a serious environmental pollutant. Its high organic load, measured in terms of biochemical oxygen demand (BOD) and chemical oxygen demand (COD), depletes dissolved oxygen in water bodies and harms aquatic ecosystems. This environmental risk, combined with whey’s nutritional potential, makes its utilization both an ecological necessity and an economic opportunity.

The global whey protein market reflects this shift. Industry estimates suggest the market was valued at roughly $12-13 billion in 2024 and is projected to grow significantly through the next decade, driven by demand in sports nutrition, functional foods, and infant formula. Clearly, what was once a disposal headache is now a multi-billion-dollar ingredient category.

Modern processing technologies behind whey products 🔗

The transformation of liquid whey into usable ingredients depends on a set of membrane-based separation technologies. Each technique targets a different component of whey, allowing manufacturers to create tailored products for specific applications.

Ultrafiltration (UF) 🔗

Ultrafiltration is the most widely used method for producing whey protein concentrates (WPC). It works by passing whey through semi-permeable membranes that retain proteins and fats in the retentate while allowing lactose, minerals, and water to pass through as permeate. UF membranes are defined by their molecular weight cut-off, typically in the range of 10,000-100,000 Da, which makes them selective enough to concentrate proteins while removing smaller molecules. A single UF stage can concentrate whey by 10 to 30 times its original volume.

Compared to older heat-based methods like drum drying, ultrafiltration preserves the functional properties of whey proteins – solubility, emulsification, and foaming ability – because it operates at low temperatures. This is critical for food applications where protein denaturation would be undesirable.

Reverse osmosis (RO) 🔗

Reverse osmosis uses very dense membranes under high pressure to remove water from whey without using heat. Unlike UF, RO retains almost all solutes – proteins, lactose, and minerals – and only allows water molecules to pass through. This makes it an effective pre-concentration step before evaporation or spray drying. According to Tetra Pak, RO can concentrate the total mass of whey by approximately three times, and the recovered water can be reused within the dairy facility for cleaning or even returned to production processes.

RO is especially valued for its energy efficiency. By reducing the water content before thermal processing, it lowers the energy required for evaporation and drying, resulting in cost savings and a smaller environmental footprint.

Electrodialysis (ED) 🔗

Electrodialysis is an electrochemical process specifically designed for demineralization – the selective removal of mineral salts from whey. The process uses alternating cation and anion exchange membranes arranged between electrodes. When direct current is applied, mineral ions migrate through the membranes, separating into a concentrated brine stream while the whey stream becomes progressively demineralized.

ED is particularly suited for producing demineralized whey for infant formula. It preferentially removes monovalent ions like sodium and chloride while maintaining a favourable calcium-to-sodium ratio, which is nutritionally important for newborns. Depending on the application, demineralization levels of 40% to 90% can be achieved. For infant formula, levels of 70-90% demineralization are typically required.

Whey protein concentrates and isolates 🔗

Whey protein concentrate (WPC) is the most commercially dominant form of whey protein. It is produced by ultrafiltration and contains protein levels ranging from 35% to 80% on a dry weight basis, along with some lactose, fat, and minerals. WPC is widely used in sports nutrition products, protein bars, bakery goods, dairy desserts, and yoghurt formulations. Its popularity comes from a combination of affordability, versatility, and excellent functional properties – it acts as an emulsifier, gelling agent, and foaming agent in processed foods.

Whey protein isolate (WPI), on the other hand, undergoes additional purification steps such as microfiltration or ion exchange chromatography. The result is a product with 90% or higher protein content and minimal lactose (below 1%). WPI is preferred in clinical nutrition, hypoallergenic infant formulas, and premium sports supplements where purity and rapid absorption are priorities.

A third category, whey protein hydrolysate (WPH), is produced by enzymatic hydrolysis that breaks proteins into smaller peptides. This improves solubility, reduces allergenicity, and makes the protein easier to digest. WPH is increasingly used in clear protein beverages and medical nutrition products for patients with compromised digestive function.

Lactose recovery from whey 🔗

Lactose accounts for roughly 70% of whey’s dry matter, making it the single largest solid component. It is recovered from the UF permeate – the stream that passes through the ultrafiltration membrane after proteins are removed. The recovery process typically involves evaporation, crystallization, and centrifugal separation.

Recovered lactose has diverse applications. In the pharmaceutical industry, it serves as an excipient – a binder and filler in tablet manufacturing – due to its excellent compressibility and inert nature. In food processing, lactose contributes to browning reactions during baking, enhancing the colour and flavour of bread, biscuits, and confectionery. It is also used as a mild sweetener and bulking agent in various processed foods.

From an environmental standpoint, lactose recovery is significant because lactose is the primary contributor to whey’s high BOD and COD values. Removing it from the waste stream can reduce the BOD by over 80%, making the remaining liquid far easier to treat before discharge.

Whey-based beverages 🔗

The beverage industry has embraced whey as a base ingredient for a growing range of products. Whey-based beverages fall broadly into two categories: fermented and non-fermented.

Fermented whey beverages 🔗

Fermentation transforms whey into probiotic-rich drinks with tangy flavour profiles. Lactic acid bacteria and other starter cultures can be used to ferment whey, producing beverages similar in taste and functionality to traditional cultured dairy drinks. These fermented products offer the added benefit of live cultures that may support gut health and improve nutrient absorption. Research published in the Water journal highlights that even acidic whey can be transformed into flavourful beverages, contributing both nutrition and hydration at low cost.

Non-fermented whey beverages 🔗

Non-fermented whey drinks include fruit-flavoured refreshments, protein-enriched sports drinks, and clear whey waters. These products leverage whey’s natural nutritional profile – its proteins, B-vitamins (including riboflavin, thiamine, and folic acid), and minerals – while adding fruit juices, sweeteners, or flavourings for palatability. The trend toward clear protein beverages is driven by the development of whey protein hydrolysates that remain soluble and transparent even in acidic conditions, making them suitable for carbonated drinks.

For smaller dairy processors who lack the capital for advanced membrane equipment, producing simple whey beverages is one of the most practical and economical options for whey utilization.

Demineralized whey in infant nutrition 🔗

One of the highest-value applications of processed whey is in infant formula. Human breast milk has a whey protein-to-casein ratio of approximately 60:40, and demineralized whey helps manufacturers replicate this balance. Highly demineralized whey (D70 or D90 grade) is often the largest single ingredient in premium infant formulas after water.

The demineralization process – carried out through electrodialysis, ion exchange, or a combination of both – removes excess minerals like calcium, phosphorus, and magnesium while retaining proteins and lactose. This is essential because natural whey contains mineral levels too high for infant consumption. By carefully controlling the mineral profile, manufacturers can add back specific minerals in precise amounts that match the nutritional requirements set by regulatory standards like the Infant Formula Act.

Demineralized whey powders are also used in clinical and sports nutrition products, chocolates, and bakery items. At lower demineralization levels (D20 to D50), the powder works as a cost-effective bulking agent with reduced saltiness, making it suitable for confectionery and pastry applications.

Whey in bakery and confectionery 🔗

The food and beverage industry uses whey proteins as functional ingredients in a wide variety of baked and confectionery products. In bakery items, WPC improves moisture retention, extends shelf life, and boosts protein content without compromising texture. Its water-binding and emulsification properties are particularly useful in bread, muffins, and protein-enriched bars.

In confectionery, whey powders and demineralized whey contribute to caramelization and Maillard browning, improving the visual appeal and flavour complexity of products like toffees, chocolates, and caramel fillings. The neutral taste of demineralized whey – free from bitterness or off-flavours – makes it well-suited for sweet applications.

Whey in animal feed 🔗

Not all whey ends up in human food. A substantial portion is channelled into animal feed applications. Liquid whey and whey permeate serve as nutritious, cost-effective feed ingredients for pigs, calves, and poultry. The lactose in whey provides readily available energy, while whey proteins supply essential amino acids that support animal growth.

Dried whey powder is used as a filler in milk replacers for calves and as a component of piglet starter feeds. The palatability of whey-based feeds is generally high, and the inclusion of whey has been linked to improved feed conversion ratios in livestock. For dairy processors, the animal feed market provides a reliable outlet for whey fractions that may not meet the specifications for human food products.

Emerging and sustainable applications 🔗

Beyond food and feed, whey is finding its way into several emerging applications. Bioethanol production from whey lactose is one such avenue – the sugar can be fermented by specialised yeast strains to produce fuel-grade ethanol. While not yet commercially competitive with corn or sugarcane ethanol, this approach offers a way to convert a polluting waste stream into renewable energy.

Biogas production through anaerobic digestion of whey is another option, particularly for large dairy facilities looking to offset energy costs. Additionally, whey-derived lactic acid is used as a precursor for bioplastics (polylactic acid or PLA), and whey proteins have been explored for producing edible films and coatings for food packaging – a promising direction in reducing plastic use.

These applications reflect a broader shift toward a dairy biorefinery model, where every component of whey is extracted, processed, and used for maximum value, much like how petroleum refineries fractionate crude oil into multiple products.

Challenges in whey utilization 🔗

Despite the impressive range of products that can be derived from whey, several challenges remain. High capital costs for membrane filtration and spray drying equipment put advanced processing out of reach for small and medium-scale dairies. Membrane fouling – the accumulation of proteins and minerals on membrane surfaces – remains a persistent technical issue that reduces efficiency and increases maintenance costs. The perishable nature of liquid whey also creates logistical challenges, as it must be processed quickly or refrigerated to prevent spoilage and microbial contamination.

In countries like India, where a large proportion of whey comes from scattered small-scale paneer and chhana manufacturers, collection and centralized processing are difficult. Encouraging these producers to adopt simple, low-cost utilization methods – such as making whey-based beverages or using whey in soup preparation – could be a practical first step.

What do you think? With whey increasingly being recognized as a valuable resource rather than waste, how might smaller dairy producers in developing countries be supported to adopt whey utilization practices? And could whey-based beverages eventually compete with mainstream sports and health drinks on supermarket shelves?

References

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC8284110/
2. https://www.fortunebusinessinsights.com/whey-protein-market-106555
3. https://en.wikipedia.org/wiki/Ultrafiltration
4. https://www.tetrapak.com/solutions/integrated-solutions-equipment/processing-equipment/membrane-filtration/whey
5. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/electrodialysis
6. https://www.grandviewresearch.com/industry-analysis/whey-protein-market
7. https://waterjournal.org/volume-14/arora/
8. https://www.lactalisingredients.com/products-dairy-ingredients/whey-powders-lactose/demineralised-whey-powder/
9. https://www.imarcgroup.com/whey-protein-powder-and-concentrate-market