Circular Economy in Agriculture: Waste-to-Value Income Pathways
- Hyera
- May 13
- 13 min read
Every year, the U.S. food system wastes an equivalent of 42 coal-fired power plants’ worth of greenhouse gas emissions. Much of that loss comes from agricultural waste. Yet instead of being put to productive use, most of this waste still ends up in landfills.
Circular agriculture changes that by converting crop residues and processing byproducts into resources, such as sustainable activated carbon used in drinking water treatment, wastewater treatment, and PFAS adsorption and remediation.
This article breaks down what the circular economy in agriculture looks like in practice and how farmers and agribusinesses are turning discarded materials into high-value income streams.
What Is the Circular Economy in Agriculture?
The circular economy in agriculture, also called circular farming or circular agriculture, is a production model designed to keep resources in use for as long as possible.
It does this by eliminating waste, restoring natural systems, and closing the loop between what is produced and what is returned to the earth.
Rather than following the traditional "take, make, dispose" approach, circular agriculture treats every output, from crop residues to food processing byproducts, as a potential input for something else.
The result is a system in which the land, water, and nutrients used in farming are continuously cycled back into production.
The Ellen MacArthur Foundation describes a circular food system as one that prevents waste, redistributes surplus food to those who need it, and converts inedible by-products into new products and inputs.
In agriculture specifically, the circular economy connects soil health, resource efficiency, and economic resilience into an integrated framework.
The Problem With Agricultural Waste
The United States Environmental Protection Agency (EPA) has documented that food waste is the single most common material reaching landfills.
It accounts for 24% of solid waste in municipal landfills and 22% of what is incinerated.
That is an enormous volume of organic material being disposed of instead of being recovered. Most of this waste was once a resource.
Corn stalks, nut shells, fruit pomace, and animal byproducts all contain nutrients, carbon, and energy that can be redirected into soil improvement, animal feed, bioenergy, or industrial applications such as activated carbon production.
According to ReFED, a nonprofit research organization focused on food waste solutions, the U.S. lets roughly 29% of its food supply go unsold or uneaten in 2024, with 60 million tons ending up in landfills, incinerators, or drains.
These numbers reflect a food and farming system still largely operating on linear principles: producing and discarding rather than cycling and reusing.
The Cost of Mismanaging Agricultural Waste
1. Environmental Impact
When agricultural and food waste ends up in landfills, it doesn't just disappear.
Decomposing organic matter releases methane, a greenhouse gas roughly 25 times more potent than carbon dioxide, as Israel Chemicals Limited (ICL) notes.
The EPA's "From Farm to Kitchen" report estimates that the greenhouse gas emissions from US food waste are equivalent to those of more than 42 coal-fired power plants, while the water embedded in wasted food could supply over 50 million homes annually.
According to ReFED's 2024 data, uneaten food in the U.S. alone accounts for:
3.5% of all US greenhouse gas emissions
15.5% of US freshwater use
16% of US cropland use
24% of all landfill inputs
Every ton of agricultural waste that bypasses recovery represents those resources lost twice over: once in production and again through disposal.
2. Impact on Public Health
Agricultural waste improperly managed poses real health hazards to nearby communities.
Open burning of crop residues releases particulate matter, nitrogen oxides, and volatile organic compounds into the air, contributing to respiratory illness and cardiovascular disease.
Decomposing organic waste in landfills also leaches contaminants into soil and groundwater, threatening drinking water quality for surrounding populations.
ReFED reports that 1 in 7 Americans face food insecurity, yet 60 million tons of food were still wasted in 2024.
Communities most affected by poor waste management are often the same ones least equipped to absorb the health costs.
What this does is create a cycle in which inefficiency in food systems aggravates inequality.
3. Financial Burden on Governments and Public Systems
Managing agricultural and food waste is expensive for municipal governments.
Landfill tipping fees, waste transport logistics, water treatment for contaminated runoff, and healthcare costs linked to pollution all fall on public budgets.
The EPA's April 2025 report on the cost of food waste estimates that the average American consumer wastes $728 worth of food per year, or $2,913 per household of four.
This represents more than 11% of total annual food expenditures, a figure that has grown sharply since 2010, when food prices rose by more than 50%.
Of that $380 billion in total surplus food value, ReFED's data shows that $325 billion, or 85.3%, is wasted rather than donated or recycled.
Only 2.5% is donated and 14.7% recycled, meaning the vast majority of recoverable value is still being lost to disposal.
Because landfill tipping fees in the U.S. remain low relative to those in other developed nations, the economic incentive to adopt better alternatives is often insufficient without policy support or market signals that push businesses and municipalities toward circular solutions.
4. Economic Loss for Farmers and Agribusinesses
Food waste creates major financial losses across the supply chain.
In the U.S., 60 million tons of food go to waste, while only a small share is donated or recycled. ReFED estimates surplus food was worth about $380 billion in 2024, with most of that tied to waste rather than recovery.
For farmers and agri-businesses, this means wasted inputs, labor, and revenue. A circular economy helps recover that value by turning waste streams into new income sources.
Key Practices in Circular Agriculture
1. Waste-to-Resource
The waste-to-resource principle is a core tenet of the circular economy.
Instead of treating agricultural byproducts as waste, this approach redirects them back into productive use. In doing so, it helps close the loop between production and consumption.
Fruit peels can become pectin or animal feed. Spent grain from breweries can become compost. Whey from cheese production can be used to feed aquaculture systems.
In each case, a material that would otherwise create disposal costs is turned into economic value.
This also reduces the environmental impact of agriculture. By keeping organic waste out of landfills and replacing some external inputs, waste-to-resource systems can help reduce greenhouse gas emissions and lower the carbon footprint of food production.
ReFED identifies anaerobic digestion, composting, and animal feed conversion as leading waste-to-resource pathways with strong financial and environmental returns.
For farmers and food processors willing to develop these systems, the benefits are clear: lower disposal costs, new revenue from byproduct sales, reduced input purchasing, and a more circular production model.
Hyera's Waste-to-Carbon Solution
Hyera is a US-based activated carbon manufacturer that demonstrates what circular agriculture looks like in an industrial context.
Rather than relying on coal or imported coconut shells like many conventional suppliers, Hyera produces its American Engineered Carbon (AEC) from 100% renewable biomass, with agricultural byproducts forming a central part of its feedstock supply.
The raw materials used include:
Almond shells
Walnut shells
Hazelnut shells
Sustainably sourced forestry residues
These materials are processed using advanced manufacturing methods with a carbon-negative footprint.
The result is a high-performance activated carbon product available in both granular (GAC) and powdered (PAC) forms.
It is used across drinking water treatment, wastewater treatment, PFAS adsorption and remediation, and soil cleanup.
By sourcing from agricultural waste streams, Hyera creates demand for byproducts that would otherwise be burned or landfilled.
They also provide farmers with an economic outlet while producing a material that directly supports environmental cleanup applications.
It is a circular model in the fullest sense: agricultural waste in, clean water and remediated land out.
Biochar Production
Biochar is a stable, carbon-rich form of charcoal produced by heating biomass (wood, manure, or agricultural waste) in a low-oxygen environment via pyrolysis. It is one of the most commercially promising waste-to-resource pathways in circular agriculture.
When applied to soil, it improves soil structure, water retention, and microbial activity.
Composting and Biofertilizer Production
Crop waste, food scraps, and animal manure can be broken down into nutrient-rich compost that improves soil structure, water retention, and biological activity.
Unlike synthetic fertilizers, compost releases nutrients more gradually and supports long-term soil health.
Biofertilizers build on this by using beneficial microorganisms to improve nutrient uptake with fewer chemical inputs.
Both can be produced at a farm or regional scale, helping reduce waste and lower soil management costs.
2. Nutrient Cycling
Nutrient cycling returns nutrients from organic waste back into the soil instead of sending them to waste.
The Sustainable Agriculture Network (SAN) identifies nutrient-cycling practices such as composting and integrated pest management as core tools for building resilient, sustainable agricultural systems.
Materials like crop residues, manure, and food scraps can be composted or digested and reapplied to farmland, helping restore key nutrients while reducing reliance on synthetic fertilizers.
This closed-loop approach supports healthier soils, stronger farm resilience, and reduced reliance on inputs.
3. Integrated Systems
Integrated farming systems combine crop and livestock production, aquaculture, or agroforestry in ways that allow waste from one enterprise to be used as feed for another.
A classic example is integrating poultry with crop production: chickens consume pest insects, their manure fertilizes the soil, and they are housed adjacent to fields that also provide forage.
These designs reduce the external inputs each system needs and improve overall land productivity.
The Sustainable Agriculture Network highlights integrated systems as one of several approaches that enhance biodiversity, reduce chemical inputs, and promote circular resource flows at the farm level.
4. Precision Farming
Precision farming uses digital tools, sensors, GPS mapping, and data analytics to apply inputs like water, fertilizer, and pesticides only where and when they are needed.
This targeted approach directly reduces waste from over-application, lowers input costs, and minimizes the environmental footprint of farming operations.
As ICL notes, AI-driven crop planning platforms are beginning to help agribusinesses calibrate production more accurately to market demand, reducing overproduction and the food waste that follows.
5. Reduced Inputs
A core goal of circular agriculture is to reduce reliance on external inputs by producing more of what the farm needs internally.
Practices such as cover cropping, composting, and integrated pest management help reduce the need for synthetic fertilizers and pesticides.
As soils become healthier over time, farms need fewer interventions, creating a positive cycle of lower input use and greater resilience.
6. Agro-Processing and Product Diversification
Agricultural byproducts that cannot be fed back into the farm system can often be processed into entirely new products:
Tomato seeds become tomato seed oil
Spent hops from brewing become protein flour
Apple pomace yields pectin, fiber, and essential oil extracts
Nut shells become feedstock for activated carbon production
These agro-processing pathways allow farmers and food businesses to monetize what they previously discarded.
It opens new markets and diversifies income streams without requiring additional land.
Businesses that extract multiple revenue streams from a single harvest become less exposed to price volatility in any one commodity market.
Economic Benefits of Circular Agriculture
1. Cost Savings for Municipal Governments
When agricultural and food waste is diverted from landfills into productive uses, the costs municipalities bear for waste collection, transport, and tipping fees decrease.
The EPA's 2025 consumer food waste cost report makes clear that the financial stakes are high: food waste represents a systemic inefficiency that costs American consumers and governments hundreds of billions of dollars annually.
Policies that incentivize circular agriculture also reduce downstream healthcare and environmental remediation costs by limiting pollution from improper waste disposal.
2. New Revenue Streams for Farmers and Agribusinesses
Circular agriculture creates income from materials that previously had no market value. Revenue opportunities include:
Selling crop residues for biochar or activated carbon production
Composting food processing waste and selling the finished product
Supplying agricultural shell byproducts to manufacturers like Hyera
Processing fruit and vegetable pomace into food-grade extracts
ReFED's data shows that billions of dollars in agricultural value are currently being sent to disposal rather than recovered.
Farmers and agribusinesses that move first to develop waste-to-resource systems will gain a competitive advantage as regulatory pressure and consumer demand for sustainable supply chains intensify.
3. Lower Input Costs
Farms operating on circular principles spend less on synthetic fertilizers, pesticides, and irrigation because they regenerate what they need from internal sources.
Compost replaces purchased soil amendments, on-farm water recycling reduces irrigation demand, and integrated pest management cuts pesticide expenditure.
Government cost-share programs like the United States Department of Agriculture's (USDA) Environmental Quality Incentives Program (EQIP) and Conservation Stewardship Program (CSP) can offset 50–75% of compost application costs in many cases.
This makes the economic case even stronger for farmers willing to invest in circular practices. These savings accumulate year over year, improving margins without requiring any increase in scale.
For smallholder farmers, especially, breaking dependence on purchased inputs removes a major financial vulnerability.
In 2022, 22.1 million full- and part-time jobs were related to the agricultural and food sectors, representing 10.4% of total US employment.
Meaning that cost pressures on farms ripple outward across entire rural economies. Circular input strategies help protect that economic base.
4. Job Creation
Processing agricultural waste into value-added products requires labor:
Collecting residues
Operating composting or pyrolysis facilities
Testing and packaging finished goods
Managing logistics
Each step represents a job, often in rural areas where agricultural employment is already concentrated.
According to the Federal Reserve, agricultural employment accounted for 5.6% of total employment in nonmetro areas in 2021, with more than half of all farm employment in rural counties.
This means rural communities are disproportionately exposed to both the decline and the recovery of agricultural industries.
Circular agriculture systems that build local processing infrastructure, from biochar operations to anaerobic digestion facilities, create stable employment tied to existing agricultural activity.
As a result, economic benefits are circulated within rural communities rather than being sent to distant intermediaries.
5. Food Security
A more circular food system produces more food from the same resources by reducing waste at each stage of production and processing.
ReFED frames this directly: 1 in 7 Americans currently face food insecurity, while the U.S. simultaneously wastes 60 million tons of food per year.
Circular agriculture helps close that gap not just by recovering edible food for redistribution but by making the agricultural system structurally more productive and less wasteful from farm to fork.
Environmental Benefits of Circular Agriculture
1. Carbon Sequestration
Biochar and compost applications build stable organic carbon in soils, keeping it locked out of the atmosphere for decades or longer.
Agricultural soils managed under circular principles consistently sequester more carbon than conventionally tilled, chemically managed land.
Activated carbon production from agricultural residues, as practiced by companies like Hyera, also locks carbon that would otherwise be released through burning or decomposition into a stable, long-lived solid form used in industrial applications.
2. Biodiversity and Soil Health
Monoculture farming and heavy synthetic input use degrade the microbial ecosystems that underpin long-term productivity.
Circular practices, including crop rotation, cover cropping, composting, and integrated systems, actively rebuild this biological complexity.
The Ellen MacArthur Foundation identifies regenerative food production as a pillar of circular food systems.
The foundation notes that practices like diverse crop varieties, rotational grazing, and agroforestry result in agricultural land that more closely resembles natural ecosystems.
3. Water Conservation
Circular agriculture reduces both the volume of water consumed in food production and contamination of water sources by agricultural runoff. Here are some ways:
Compost-amended soils hold moisture more effectively
Precision irrigation systems apply water only where needed, and
Composting organic residues rather than landfilling them reduces nutrient leaching that drives algal blooms in rivers and lakes.
The EPA's environmental impacts report found that the water embedded in wasted US food could supply over 50 million homes annually.
Recovering that efficiency through circular practices represents a significant conservation opportunity.
Benefits of Circular Agriculture on Human Health
1. Reduced Exposure to Air Pollutants
Open burning of agricultural waste is a leading source of particulate air pollution in farming regions.
It contributes to asthma, chronic obstructive pulmonary disease, and cardiovascular conditions in rural communities.
Circular agriculture eliminates this disposal pathway by giving crop residues, nut shells, and other organic materials a productive use, whether as compost feedstock, bioenergy, or raw material for products like activated carbon.
Reducing landfill volumes of organic waste also cuts the methane and other toxic emissions generated by landfill sites.
This in turn, improves air quality for communities near disposal facilities, which are disproportionately lower-income in the U.S.
2. Cleaner Water
Agricultural runoff containing nitrates, pesticides, pathogens, and microplastics is a major source of drinking water contamination in the U.S.
Microplastics and other pollutants have been found in water sources, food crops, and even human blood, raising growing health concerns.
Circular farming practices can help reduce contamination at the source by improving the soil’s ability to absorb and filter water, which lowers the volume and chemical load of runoff entering waterways.
Agricultural waste can also be used as treatment materials, such as activated carbon, to remove microplastics and other pollutants from drinking water and wastewater.
3. Safer Communities
Communities near industrial farms and landfills bear a disproportionate share of the health risks generated by linear agricultural systems.
Transitioning to circular agriculture reduces the volumes of waste that landfills must process and the pollutant loads treatment systems must manage.
This directly improves the conditions in these communities.
Circular models also tend to distribute agricultural infrastructure more evenly across regions, reducing the concentration of environmental burdens on any single community.
4. Healthier Food Systems
Circular agriculture produces food in ways that rebuild rather than degrade the natural systems on which long-term food security depends.
Farms with healthier soils grow more nutrient-dense crops, reduced pesticide use lowers chemical residues in food, and shorter supply chains supported by circular models improve food quality and freshness for end consumers.
The Ellen MacArthur Foundation connects regenerative food production directly to human health outcomes.
Noting that practices that generate positive outcomes for soil, biodiversity, and water quality also produce food that supports healthier diets and communities.
Policy and Market Frameworks Supporting Circular Agriculture
Governments at the federal, state, and local levels are recognizing that reducing agricultural waste and incentivizing circular practices requires both regulation and investment.
The U.S. 2030 Food Loss and Waste Reduction Goal, jointly set by the EPA and the United States Department of Agriculture (USDA), aims to cut food waste in half by 2030 and has catalyzed state-level action across composting infrastructure, organics diversion mandates, and food donation laws.
ReFED's Policy Finder tracks the current landscape of these policies, highlighting best-practice legislation that can accelerate circular systems.
On the market side, growing demand for sustainable supply chains from food companies, retailers, and investors is creating commercial incentives for circular agriculture that didn't exist a decade ago.
Companies sourcing agricultural byproducts for value-added products, including activated carbon manufacturers like Hyera that purchase nut shell residues from farming operations, are building the commercial infrastructure that makes circular agriculture economically viable at scale.
Tax incentives for composting and anaerobic digestion investments, extended producer responsibility frameworks, and green procurement policies all reinforce these market signals and lower the barriers for farmers and agribusinesses looking to make the transition.
Your Farm's Waste Is Worth More Than You Think
Circular agriculture offers a direct solution for poorly managed agricultural waste, and companies like Hyera are proof that the model works at scale.
By converting agricultural waste like almond, walnut, and hazelnut shells into high-performance activated carbon for drinking water treatment, wastewater treatment, and PFAS adsorption and remediation, Hyera helps reduce the environmental and financial costs that mismanaged agricultural waste imposes on public systems.
If you are ready to explore how your agricultural waste stream can generate value rather than liability, finding out what Hyera's American Engineered Carbon can do is a strong place to start.
Frequently Asked Questions
What is circular agriculture and how does it differ from conventional farming?
Circular agriculture is a farming model that eliminates waste by continuously cycling nutrients, water, and organic materials back into production. Unlike conventional farming, which discards byproducts and relies heavily on external synthetic inputs, circular agriculture treats every output as a potential resource for the next production cycle.
What are the benefits of a circular economy for food?
The benefits of a circular economy for food systems include reduced greenhouse gas emissions, lower input costs for farmers, cleaner water and air, stronger food security, and new revenue streams from waste-derived products. It also reduces the financial burden on municipal governments that currently absorb the costs of managing food and agricultural waste.
What is a sustainable and circular bioeconomy?
A sustainable and circular bioeconomy is an economic system in which biological resources, including agricultural crops, residues, and organic waste, are used to produce food, materials, chemicals, and energy while minimizing waste and regenerating natural systems.
Who benefits from a sustainable and circular bioeconomy?
Farmers, agribusinesses, municipal governments, consumers, and ecosystems all benefit. Farmers gain new revenue streams and lower input costs, governments reduce waste management spending, consumers access cleaner food and water, and natural systems recover biodiversity and soil health as agricultural pressure on land and water resources decreases.
About Hyera
Hyera delivers high-quality and consistent activated carbon products, specifically designed to replace coal-based activated carbon products.
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