28 February 2022

6 minute read

By: Stanley Kaye

In the last decade or so, there has been great interest in the option of using insects to convert organic waste (bio-waste) into protein and compost.

The insect protein produced from this process can be used as an ingredient for animal feed or human food. It appears that in Western markets consumer acceptability will be a great barrier to marketing insect-based food to humans. Therefore, it seems that the main market for insect protein will be for animal feed.

Excellent protein source

Many kinds of insects can be grown to produce protein. I will focus on black soldier flies (BSF), which are by far the frontrunner. I will not go into the technical side, except to say that the eggs of BSF larvae are spread over a substrate of organic waste, e.g., pig manure, feed waste and slaughterhouse waste. The eggs hatch and grow into larvae. The larvae feed off the organic waste. They are harvested after about 12 days and processed into oils or meals with a high protein content. The protein is very rich and has a good balance of amino acids. The residue is valuable organic fertilizer. If the larvae are allowed to pupate into flies, these can be used to breed the next generation.

Why is use of insect protein valuable for the swine industry?

Sustainability and the environment – The pig industry is frequently attacked as being unsustainable. The reasoning is that it takes about 4 kg of feed ingredients to produce 1 kg of pig meat product. With the use of insects, almost all waste is reconverted back into either protein and lipids for feed or residue for fertilizer. Thus, the pig economy becomes much closer to circular.

Sources of protein for animal feed – There are two main sources of protein for animal feed, soya and fish meal, which are challenging for the environment.

The growth of soya beans for animal feed protein is criticized as it is often grown on land from reclaimed rain forests. It also competes with crops that could feed the local population. BSF can replace soya in animal feed. This would reduce the pressure to clear rain forest so that more land can be used to produce soya as livestock farming expands.

The lucrative market for fishmeal for animal feed encourages corporate fisheries not to limit their yields of by-catch (from which fish meal is made), and thus leads to depletion of ecosystems, environmental damage, and the collapse of local fisheries.

Use of BSF can replace both soya meal, soya oil and fishmeal with great advantages to the environment.

The process of growing BSF from waste can be done locally without the need to transport the waste to large sites. It converts waste products – litter and manure and other agricultural waste – which are potential pollutants (ammonia, smell, water pollution), into stable valuable resources.

The basic process, if designed correctly, will use little energy and have no negative environmental impact (smell, emission of greenhouse gasses, pollution of water tables, etc.). With BSF treatment, direct greenhouse gas emissions are 47 times lower than from windrow composting.[i]

Economics – The pig industry, which is basically a way to convert vegetable protein into animal protein, faces a long-term challenge from lab-produced proteins. The use of insect protein should increase the efficiency of the pig industry and improve its position to face these challenges.

Initial results seem to show that the use of insect-based protein in feed improves swine health. It is also greatly valued in poultry, premium pet food and the aquamarine industry.

Where are we today?

The BSF and insect protein industry is at about the stage of development that the renewable energy industry (mainly solar and wind power) was 30 years ago.

The basic science has been done and it is recognized that the process works technically. Commercial-sized pilot projects exist around world. There are also a few large-scale producers, who are keeping most of the details under wraps for understandable commercial reasons.

Thirty years ago, renewable energy was not regarded as a solution for fueling the world economy. It had a few niche applications and mainly went forward due to government subsidies and environmental activists. In 2021, renewable energy is competitive with fossil fuels. It is not only the main pivot of world attempts to contain global warming but also the cheapest way to power an economy.

The chief challenge preventing BSF technology from being rolled out on a large scale is cost. According to a Rabobank analysis, the cost of insect protein is typically €3,500–€5,500 per metric ton. The equivalent price of fish meal is between €1,200–€2,000 per ton.

So, there is a vicious circle that needs to be broken: costs are high, so scale is low, but to reduce costs we need scale. This is a classic situation calling for government intervention to encourage scale. Before we look at the role of government, we should look at the cost side deeper.

• The main raw material for BSF in the pig industry is animal manure (after separating from water) and slaughterhouse waste. This can be supplemented with food waste and other organic waste. These materials are available virtually free. Though they have a use for fertilizer, among other uses, most farms pay to have their compost removed from the farm. So, virtually the only material cost after the raw material is some energy to maintain a temperature of about 28–30°C and the cost of BSF eggs. What drives up the high costs is the capital cost of the system and the labor cost of operating it.
• Once scale is reached, increased automation will reduce labor costs greatly. Capital costs will be reduced by economies of scale and development of flow technology rather than more expensive batch technology.

Regulation hurdles

Another hurdle to overcome to reach scale is regulation. Regulations differ from country to country, but they basically fall into two categories:

• Can insect-grown protein be used in animal feed?
• If so, from what waste materials can the insect larvae be fed?

This summer the European Union relaxed its regulations to allow BSF to be used for animal feed in larvae as well as in oil form. This is in addition to its use in pet food and aquaculture, which has already been approved.

At the same time, EU regulations still prevent insects from being fed on animal waste, including litter.

Governments need to recognize the beneficial effects of the use of insect farming. So, for example, it can be used as a safe and sustainable means to recycle agricultural waste. Policy makers should also consider ways to encourage the industry’s development.

I see a five-stage process by which the cost of insect protein will fall to a level that will make it affordable and thus demanded in large quantities.

• Development of process flow technology which will work well with automation and lower capital costs
• Similar relaxation of regulation to allow animal manure and slaughterhouse waste to be used as substrate for insect growth. This will make lower the cost of raw materials.
• Specialization of insect facilities into breeding stock and protein production
• Continued research into the breeding process, ideal temperatures, etc., and the way to supply producers with packages of eggs that can be activated when required for production. This research is already being spearheaded by an Israeli bio-startup Freezem.
• All this will lead to economies of scale to the point that it will be economically viable to compete with fish meal and soya on its own merits.

Rabobank expects that the cost of insect protein will fall below €2,000 by the end of the decade. At this price, BSF use should be widespread, thus converting the pig industry into a virtually circular economy. This will enable it to increase efficiency and improve its image.

The writer is the business development manager at Agrotop, a leading international supplier of integrated livestock projects.