By Matt Hale, International Sales & Marketing Director, HRS Heat Exchangers
According to some estimates, over a third of all the food produced globally is wasted. The UK generates around 9.5 million tonnes of food waste a year, of which some 1.5 million tonnes (16%) comes from manufacturing1. While not all of this material is edible, in terms of efficiency and reducing greenhouse gas (GHG) emissions, prevention of this waste is preferable to other methods such as food redistribution or use as animal feed, or recycling, energy generation or disposal via anaerobic digestion, composting, incineration or landfill.
Waste food is food which cannot be consumed by somebody. With large numbers of people going hungry across the globe, and increasing pressure on land, there is a moral imperative to maximise the amount of produced food which is actually consumed. Food production is also a significant source of global GHGs, and waste food generates further emissions without any nutritional benefit. Reducing food waste is a key factor to mitigate climate change.
Waste food also has significant financial costs for businesses. Not only does the raw material have a cost, but additional costs are associated with the redistribution or disposal of waste food products. As food and energy costs have undergone massive inflation over the last 12-18 months, the need to control costs and maximise utilisation of expensive ingredients has also increased.
There are a number of approaches which businesses can use to assess and reduce food waste, and in most cases a mixture of valorisation, utilisation and process improvement (or implementing LEAN processes) will be required.
Some key areas to consider include:
1. Improve packaging
Good quality packaging improves the shelf life of food and therefore reduces waste in the distribution chain and in households. However, there is increasingly a balance between reducing the use of plastics and non-recyclable materials, while increasing product shelf life (wrapping cucumbers in plastic is a classic example).
Choosing the right packaging during the manufacturing process can improve shelf life and reduce handling, improving efficiencies and reducing waste. Accurate and consistent weighing is also important, as even a few grams surplus in each pack can quickly add up to large sums of money.
2. Improve forecasting
Inaccurate forecasting can mean you waste raw materials and ingredients. Don’t assume that you need to produce a certain number of products unless you have clear evidence for such demand (such as agreed orders or demand modelling). Ordering enough ingredients to produce a certain volume of product but actually producing less, is one of the biggest sources of waste in food businesses, particularly when using fresh or perishable ingredients.
Better and more accurate forecasting models allow you to guess less and maximise the use of ingredients.
3. Measure and plan
Without measuring waste, you can’t tell if you are reducing it, or adequately calculate what it is costing you. Feeding this data into company-wide systems so that it can be analysed centrally helps to identify areas of inefficiency and waste, allowing manufacturers to streamline processes and reduce waste.
Having systems in place to measure waste and efficiently plan production can greatly reduce the amount of waste generated. For example, producing subsequent or similar batches of product may reduce the need to empty processing lines between production runs.
4. Review quality control systems
Quality control is vital to maintain standards and food safety, but there is a need to avoid overzealous standards which may result in ingredients which are perfectly usable being discarded. Likewise, under- or overcooking-food, or having unnecessary trimmings or off-cuts results in unnecessary waste.
As well as making sure that the quality standards and specifications being applied are appropriate for the product, it is also important to make sure that the processes used for quality assurance are operating correctly, whether that is calibrating equipment or training staff.
5. Involve staff
As with other areas, staff awareness, education and involvement play a huge role in minimising waste. Employees should be invested and committed to reducing waste and building it into company culture.
As well as educating staff about the impacts of waste, they should be encouraged to take part in a full dialogue as employees often have useful insights into the manufacturing processes. Recognising and rewarding innovative ideas can help waste prevention become an ingrained habit and a key value within the organisation.
6. Improve ‘disposal’ of unavoidable waste
Even with the best will in the world, some ‘waste’ is likely to be generated. This should be dealt with in a way which maximises its usefulness or value. According to the food waste hierarchy, in order of preference these disposal options are:
a. Redistribution to people
b. Use for animal feed
c. Anaerobic digestion
e. Incineration with energy recovery
f. Incineration, landfill or disposal via sewerage systems
It may also be possible to utilise certain products in novel ways, for example vegetable oils and animal by-products (ABPs) can be converted into biodiesel where facilities allow.
7. Use technology to reduce waste during production
New technology or equipment may help increase utilisation, for example by recovering more usable protein from meat carcases. Another option is to optimise existing production processes, particularly when it comes to production changes or cleaning-in-place (CIP).
Depending on the product, how such cleaning is handled, and product complexity, this may be required several times a day between production batches. If product remaining in equipment is ‘flushed’ using pigging systems, large quantities of otherwise usable product could be lost. Careful product design can also recover product. For example, the HRS R Series of heat exchangers uses a scraper bar within the inner tube to enhance product flow, prevent fouling and minimise pressure drop. It has the unique feature is that when configured correctly, the unit can be run in reverse, effectively emptying the heat exchanger tube(s) of product without damaging it or changing its characteristics, so it can be recovered and utilised.
Due to the amount of product saved, and the fact that it is often unnecessary to install additional product recovery systems, the R Series heat exchanger can quickly pay for itself, and in the long term can be a more economic option than alternative systems which have lower capital costs