Sawdust Is Not a Market: What 125 Studies Say About Selling Wood Residues

Introduction

Every sawmill produces more than boards. Bark, sawdust, shavings, chips and off-cuts leave the line alongside the sawn output, and for decades the question has been what to do with them. A recent review in the journal Resources takes a step back from the individual conversion technologies and asks a commercial question: where do wood waste and residues actually find buyers, and what holds those markets back?

The authors point out that the forest and wood-products sector is economically significant. Citing a 2023 state-level study of United States figures, they note that the sector supported an estimated 3.4 million jobs, about $254 billion in labor income and $427.3 billion in GDP, with commercial logging alone employing nearly 250,000 workers. Residue handling sits inside this large system, and the way residues are valued affects both mill margins and environmental outcomes.

The streams in scope are broad. They include forest-harvesting residues such as branches, tops, slash, stumps and roots, which are dispersed, bulky and variable in moisture. They also cover wood chips, sawdust and shavings concentrated at mills, bark and other mill residues, low-grade roundwood and small-diameter wood, urban and post-consumer wood from construction and demolition, and industrial by-products such as black liquor and other industrial residues. For a sawmill reader, the mill-based streams are the most relevant, but the review shows how they compete with and relate to the others.

The central message is deliberately sober. Having a technology that can turn residues into something useful does not create a market. The review identifies logistics, competition, supply and demand conditions and standardization as the factors that decide whether a residue stream becomes a product or stays a cost.

Research methodology

The work is a rapid review, reported following the PRISMA 2020 guidance. It was not registered and had no formal protocol, which is typical for a rapid format but worth remembering when judging its reach. The team searched a single database, the Web of Science Core Collection, in September 2025, using a topic search that combined terms for wood, log or mill with waste or residue and with market.

The screening funnel was as follows. The search returned 1,181 records, and 3 duplicates were removed, leaving 1,178 to screen by title and abstract. At that stage 628 were excluded, so 550 reports went forward for full-text assessment. Of these, 424 were excluded because they did not meet the market-related scope. One further duplicate was found among the 126 eligible reports, giving a final sample of 125 unique studies published between 1967 and 2025.

Reports were kept only if they met the review's market-related scope (424 full texts were excluded on that ground). Screening of titles, abstracts and full texts was handled in the Covidence platform by two independent reviewers, with disagreements resolved by discussion and consensus; no inter-rater agreement statistic was calculated. The lead reviewer extracted data with a predefined coding framework and a second reviewer checked it.

For analysis the authors used descriptive counts and percentages together with qualitative content and thematic analysis. They organised the material through two lenses. The first is the Marketing Mix, which looks at product, price, place and promotion. The second is an Innovation perspective, used to explain how markets change over time, and sorted into technological, institutional, social, policy and financial innovation. The review did not include a meta-analysis, a risk-of-bias assessment or a certainty-of-evidence rating.

The authors also disclose that Microsoft Copilot (GPT-5 Chat) was used to help refine the search strategy and inclusion criteria, and state that it made no screening, extraction, coding or analytical decisions.

Key findings

The literature is recent and concentrated. Of the 125 studies, 6 (4.8%) date from 1967 to 1999, 14 (11.2%) from 2000 to 2009, 59 (47.2%) from 2010 to 2019 and 46 (36.8%) from 2020 to 2025. In total 105 studies (84.0%) appeared from 2010 onward. Geographically, North America accounts for 43 studies (34.4%) and Europe for 42 (33.6%), together 85 studies or 68.0%. Global or multi-regional work makes up 16 (12.8%), Asia 9 (7.2%), South America 8 (6.4%), Africa 4 (3.2%), Oceania 2 (1.6%) and one study (0.8%) was unspecified. Methodologically, 94 studies (75.2%) were quantitative, 20 (16.0%) used mixed methods and 11 (8.8%) were qualitative.

Energy dominates, but materials are growing. Energy-related applications appear in 109 studies (87.2%), while material or bioproduct applications appear in 57 (45.6%). Studies can cover both. Looking only at 2020 to 2025, material or bioproduct uses appeared in 21 of 46 studies (45.7%) and energy uses in 37 (80.4%). So the energy share has eased while the material side holds its ground. Specialised applications named in the review include sustainable aviation fuel, biobased chemicals, biochar, engineered panels, activated carbon, mycelium-based insulation and natural dyes.

Logistics is the biggest obstacle. Studies could report more than one challenge. Logistics and infrastructure were raised in 77 studies (61.6%), competition in 48 (38.4%), supply and demand conditions in 40 (32.0%), lack of standardization in 18 (14.4%), negative consumer perceptions in 6 (4.8%) and information gaps in 2 (1.6%). Our gloss: the picture is one of physical and commercial friction rather than lack of ideas, since bulky material has to be collected, processed and moved to a buyer at a price that works.

Price is shaped by markets and by policy. Market-based approaches include energy-value and cost-plus pricing. Policy-supported approaches include subsidies, tax credits, carbon pricing and Renewable Identification Numbers. The literature also covers gate fees, tipping fees, minimum selling prices, economies of scale, cluster-based production and life-cycle costing, and the review treats residue prices as context-dependent.

Place is mostly business to business. Residues move from suppliers to factories, power plants, pulp mills and biorefineries. Bulky material tends to travel through local and regional channels, while densified biomass can be shipped internationally. Cluster-based, portable and decentralised processing are described as alternatives.

Promotion is indirect. The review reports that conventional consumer advertising was rarely evident and describes certification, environmental claims, policy programmes, feed-in tariffs, renewable portfolio standards, carbon credits and knowledge sharing as the tools that make buyers aware of and comfortable with residue-based products.

Innovation spans more than technology. Technological examples include pyrolysis, gasification, hydrothermal liquefaction, torrefaction, Ethanol-to-Jet, co-firing, biochar, portable in-woods processing, steam explosion, pelletization and briquetting, plus GIS or BioGeSTO decision tools. The authors stress that technical feasibility did not guarantee commercial readiness. Institutional innovation covers industrial clusters, reverse logistics, cooperatives, shared infrastructure, integrated biorefineries and industrial symbiosis. Social innovation includes stakeholder participation, education, certification and Design-for-Deconstruction. Policy instruments include renewable portfolio standards, feed-in tariffs, recovery incentives and rules defining eligible biomass, and the review notes that inconsistent definitions across jurisdictions create investment uncertainty. Financial tools include joint government-industry funding, carbon credits, renewable-energy certificates and gate-fee arrangements; the authors distinguish analytical tools such as discounted cash flow and techno-economic analysis from financial innovations.

Practical applications for sawmills

The review is not a manual, and its authors do not give mill-level instructions. The following points are our reading of what the findings mean for a sawmill operator, and should be treated as interpretation.

First, think of each residue stream separately. The paper's conclusion is that residue value depends on context and on matching a specific stream to a viable market. Clean sawdust and shavings concentrated at the mill sit in a very different position from dispersed harvesting slash or contaminated post-consumer wood. A mill gains little from a generic plan for all residues; it benefits from knowing which of its own streams has a nearby, reliable buyer.

Second, look at logistics before technology. Since logistics and infrastructure came up in 61.6% of studies, the distance to the buyer, the means of loading and the moisture and storage conditions probably matter more than the choice of end-use. Where on-site volumes are large and regular, shared infrastructure or cooperative arrangements with neighbouring mills, as described under institutional innovation, may lower per-unit handling cost.

Third, expect competition for your material. Competition appears in 38.4% of studies. If pellet makers, board producers, heat plants and other mills draw on the same pool of sawmill by-products, prices will reflect that. Long-term supply agreements and clarity about quality are ways to reduce exposure, though the review itself does not prescribe contract forms.

Fourth, specifications and standardization pay off. The review lists lack of standardization as a recurrent barrier. Consistent particle size, moisture and cleanliness help a residue move from a waste category to a commodity, and make it easier to sell to the business buyers who dominate this market.

Fifth, keep an eye on policy definitions. Because eligibility rules for biomass vary between jurisdictions and drive investment decisions, a mill planning to sell to energy buyers or to enter a certification scheme should check how its residues are classified locally, and how subsidy or carbon-related support could change buyers' willingness to pay.

Sixth, do not abandon energy, but watch the material side. Energy remains the main outlet in the literature (80.4 percent of 2020-2025 studies), while material and bioproduct uses appeared in 45.7 percent of them. The authors describe diversification, not replacement. For a mill, that suggests keeping established energy outlets while testing higher-value niches where a partner and a market already exist.

Limitations

The authors state several limits. The review was not registered. Only the Web of Science Core Collection was searched, and grey literature such as industry and government reports was excluded, which may be a serious gap for a topic where practical market information often lives outside journals. The word "market" in the search string may have missed relevant supply-chain or economic studies that never used it. No risk-of-bias or certainty-of-evidence assessment was carried out, so the review shows what has been written, not how reliable each claim is. The reported frequencies describe patterns in the identified literature and not the full body of research. The authors note that the evidence is geographically concentrated in North America and Europe; the fact that three quarters of the studies were quantitative is our observation, and conclusions may not transfer to other regions.

Limitations of this article: the paper was checked through the publisher page text and not against the PDF. The publisher page byline lists four authors (Prakosa, Larasatie, Barrett, Bond), all affiliated with Virginia Tech and associated bodies in the USA, with Prakosa also at the University of Muhammadiyah Malang, Indonesia; the page's citation metadata had named only one author. The licence shown in the page metadata is Creative Commons Attribution 3.0 (CC BY 3.0). The practical section reflects our interpretation, not recommendations made by the authors, and we did not check the figures against the underlying studies.

Conclusions

This review argues that wood residue markets are widening, with energy, material and bioproduct outlets all present, but that widening is not the same as replacing one with another, and the old constraints remain. The existence of feedstock does not mean a market is ready. The Marketing Mix lens shows how today's markets are configured, mostly business to business, price-sensitive and supported by policy, while the Innovation lens shows how they change through technology, institutions, social acceptance, regulation and finance.

For a sawmill, the take-away is practical and modest: the value of residues is local and stream-specific. The authors' conclusion is that progress depends on matching specific residue streams to viable markets, better supply-chain coordination, clearer material specifications, and technological, market, policy and financial arrangements tailored to particular feedstocks and regions. The next gains are likely to come from fitting the right stream to the right buyer, more than from any single new process.

Original research

Authors: Galit Gatut Prakosa (corresponding author; Virginia Tech, USA, and University of Muhammadiyah Malang, Indonesia), Pipiet Larasatie, Scott M. Barrett and Brian Bond (Virginia Tech and Virginia Cooperative Extension, USA).

Title: From Environmental Burden to Valuable Feedstock: A Rapid Review of Wood Waste and Residue Markets

Journal: Resources (MDPI), 2026, 15(9), 123; review article in the Special Issue "Alternative Use of Biological Resources: 2nd Edition" (published 18 September 2026)

DOI: 10.3390/resources15090123

Licence: Creative Commons Attribution (CC BY; page metadata states CC BY 3.0)

Link: https://doi.org/10.3390/resources15090123 (publisher page: https://www.mdpi.com/2079-9276/15/9/123)