How Waste Disposal Affects Your Factory's Carbon Footprint: Comparing Recycling, Incineration, and Landfill

Introduction

When factories discuss carbon emissions, the focus typically falls on process electricity, fuel combustion, or raw material procurement. Waste disposal carbon emissions are usually ignored — because once scrap is collected, it disappears from view, and no longer feels like the factory's carbon problem.

But the choice of final waste disposal method has a significant impact on carbon footprint. More importantly, as brand customers' requirements for supply-chain carbon disclosure continue to rise, waste disposal method is transitioning from "a cost issue" into "a prerequisite for getting orders." It is no longer a question of choosing whether to act — it is a question of potentially losing orders if you do not.

This article explains the carbon emission differences between recycling, incineration, and landfill; Taiwan's current waste disposal carbon emission situation; how to calculate waste carbon footprint; and how factories can practically reduce carbon emissions through waste recovery.

Carbon Emission Comparison: Three Disposal Methods

Incineration: highest carbon emissions

Incineration is currently one of the primary methods for processing industrial waste in Taiwan. Its advantages are substantial volume reduction and destruction of hazardous substances — but the cost is that all the carbon in the waste is released as CO₂ during combustion.

Plastic waste has particularly high carbon emission factors because plastics are carbon-rich. For PP, incineration of one ton of waste produces approximately 2.0–2.8 tons of CO₂. PET has a slightly lower emission factor, approximately 1.5–2.0 tons CO₂ per ton. These figures represent direct combustion release only and exclude the transportation carbon emissions from hauling waste to the incineration facility.

From a carbon emissions perspective, incineration has the highest emissions of the three disposal methods — and once material is incinerated, the carbon it contains is permanently released to the atmosphere with no possibility of recovery or reuse.

Landfill: long-term carbon emission concerns

Landfill generates lower immediate carbon emissions than incineration, because waste is not burned right away. However, landfill creates a "long-term" carbon emission problem: organic waste decomposes slowly in anaerobic conditions and produces methane (CH₄).

Methane's global warming potential is approximately 28 times that of CO₂ over a 100-year period. Even at relatively small emission volumes, its climate impact remains substantial. Landfill sites also cannot capture all methane produced — some gas is directly released to the atmosphere, further exacerbating warming.

A note on biogenic carbon accounting: waste from biological sources — wood, paper, and similar materials — has its carbon emissions typically disclosed separately from fossil carbon under carbon accounting frameworks such as ISO 14064 and the GHG Protocol, rather than counted directly in fossil carbon emissions. If your waste stream includes wood or agricultural residue, confirm whether the emission factors being used distinguish biogenic from fossil carbon.

Taiwan's landfill capacity is limited, and regulatory controls on industrial waste landfill have been tightening in recent years. Some waste types are no longer permitted for direct landfill and must be pre-treated before disposal.

Recycling: avoiding emissions, not generating negative emissions

Recycling's carbon emission advantage, within standard carbon accounting frameworks, should be understood as "avoided emissions" rather than direct negative emissions. These are different concepts with different treatment in Scope accounting.

The avoided-emissions logic is: recovering waste and producing regrind that substitutes for virgin resin avoids the carbon emissions required to produce that virgin resin. This reduction is real, but its validity rests on the premise that regrind actually substitutes for virgin resin use — rather than simply adding additional supply to the market. In carbon footprint calculations, this is called the "system boundary assumption" and is a key point examined in formal carbon audits.

Under the assumption that substitution occurs, and using PP as an example: producing one ton of virgin PP emits approximately 1.5–2.0 tons CO₂e; recovering one ton of PP waste and producing regrind emits approximately 0.3–0.6 tons CO₂e. Each ton of PP waste recovered can avoid approximately 1.0–1.7 tons CO₂e of emissions.

Comparing this to incineration: the same ton of PP waste incinerated releases approximately 2.0–2.8 tons of CO₂; recycled, it avoids approximately 1.0–1.7 tons CO₂e of emissions. The gap between these two figures represents the carbon reduction a factory delivers by choosing recycling over incineration.

Taiwan's Waste Disposal Carbon Emission Landscape

Industrial waste processing structure

Industrial waste processing in Taiwan is dominated by incineration; landfill is now essentially no longer used. The reuse (recycling) proportion has been growing in recent years, but recovery rates vary significantly by waste type. Metal waste recovery rates are high, approaching 90% or above. Mixed plastic waste recovery rates are comparatively low, with a substantial proportion still entering the incineration stream.

The carbon levy's impact on waste disposal

Taiwan's carbon levy system was formally launched in 2024, with the first phase targeting large emitters with annual carbon emissions above 25,000 tons. While waste incineration carbon emissions are not yet required to be directly reported by all companies, the carbon levy system is gradually expanding and waste disposal carbon emissions are likely to be brought within the reporting scope in the future.

The more immediate impact comes from the supply chain. Many major brand customers require suppliers to submit carbon footprint data that includes Scope 3 (value chain) emissions. Waste incineration carbon emissions fall under Scope 1 (own incineration facilities) or Scope 3 (commissioned external incineration) — either way, they should be included in carbon footprint reporting.

As these requirements grow, waste disposal method is transitioning from a cost issue into a prerequisite for receiving orders. Suppliers who can present concrete waste recovery data and carbon reduction explanations will have a clear competitive advantage in brand customer audits; conversely, suppliers unable to explain their waste destinations and carbon emissions may face the risk of being removed from supplier lists.

Carbon Footprint Calculation Methods and Tools

Formula for waste disposal carbon emissions

Basic formula for waste incineration carbon emissions:

Waste incineration carbon emissions (tons CO₂e) = waste volume (tons) × waste emission factor (tons CO₂e / ton of waste)

Reference emission factor ranges for common waste types:

• PP and PE waste: approximately 2.0–2.8 tons CO₂e/ton
• ABS waste: approximately 2.5–3.2 tons CO₂e/ton
• Mixed plastic waste: approximately 1.8–2.5 tons CO₂e/ton
• Wood and paper waste: approximately 1.3–1.8 tons CO₂e/ton (biogenic carbon requires separate disclosure)

These figures are reference ranges. Formal carbon footprint reports should use emission factors published by the Environmental Protection Administration, or engage a professional carbon accounting organization to confirm the applicable calculation methodology.

Simplified recycling carbon reduction calculation

For situations requiring explanation to customers or ESG reports, the following simplified formula estimates carbon reduction:

Carbon reduction (tCO₂e) ≈ volume shifted to recycling (tons) × (incineration emission factor + recycling avoided emission factor)

Example: shifting 10 tons of PP waste per month from incineration to recycling, with an incineration emission factor of approximately 2.4 and a recycling avoided emission factor of approximately 1.3, gives an estimated carbon reduction of approximately 37 tons CO₂e per month.

This calculation rests on the system boundary assumption noted above — that regrind actually substitutes for virgin resin use. If it only increases market supply without genuine substitution, the carbon benefit will be challenged in a formal audit.

Available carbon footprint calculation tools

Taiwan EPA Carbon Footprint Calculation Tool: the Environmental Protection Administration provides a free carbon footprint calculation platform suitable for small and medium enterprises doing basic carbon accounting. Taiwan-applicable emission factors are built in.

GHG Protocol: the Greenhouse Gas Accounting and Reporting Protocol published by the World Resources Institute is the most widely used carbon accounting framework internationally. Scope 1, 2, and 3 calculation methods are explained in detail.

ISO 14064: the International Organization for Standardization's greenhouse gas accounting standard. Requires third-party verification; suited to companies with externally published ESG reports.

How Factories Can Reduce Carbon Emissions Through Recycling

Step 1: Clarify how your waste is currently being handled

To reduce carbon emissions, you first need to know where your waste goes now. List the disposal method for all factory waste categories: which are sent to external incineration, which are landfilled, and which are already being recycled. Waste currently going to incineration represents the highest-potential area for carbon reduction.

Step 2: Assess the proportion of waste that can be recovered

Not all waste is suitable for recycling — hazardous waste, severely contaminated scrap, or materials without an established recovery market may still need incineration. But most industrial waste — particularly plastics, metals, and wood with established recovery markets — has room to increase recovery rates.

The goal is to shift as much incineration-destined waste as possible into the recycling stream. Every ton shifted reduces incineration carbon emissions while generating avoided emission benefits from recycling — a double carbon reduction effect.

Step 3: Build tracking records

Carbon emission figures need documented records as support before they can be presented in ESG reports or customer audits. Basic tracking records include: monthly volume of each waste type generated; disposal method for each type (recycling/incineration/landfill); the destination of recycled waste (which regrind trader or processor); and the source of emission factors used in carbon footprint calculations.

Records do not need to be complex from the start — the most basic version is a monthly-updated spreadsheet. With this foundation in place, data collection is far easier when a formal carbon accounting report is needed later. You will not find yourself scrambling to compile missing records during a customer audit.

Common Misconceptions

Misconception 1: "Once waste is collected by a contractor, it is no longer my carbon emission problem"

After waste is collected by a contractor, the incineration process's carbon emissions fall under Scope 3 supply-chain emissions — they remain within the company's carbon emission scope in a complete carbon footprint calculation. Many brand customers require suppliers to calculate complete Scope 3 emissions. Waste incineration carbon emissions cannot be avoided in the calculation simply because the disposal was outsourced.

Misconception 2: "Recycling equals negative emissions — it can be directly deducted from our carbon accounting total"

Recycling generates "avoided emissions" — not a value that can be directly subtracted from the company's total carbon emissions. Under the GHG Protocol and ISO 14064 frameworks, avoided emissions are typically disclosed separately in carbon accounting reports rather than directly offsetting reported emissions. This distinction matters during customer audits and third-party verification.

Misconception 3: "Carbon footprint calculation is too complex for small and medium enterprises"

Basic waste carbon footprint calculation is not complicated — it requires only two figures: waste volume and emission factor. The free tools provided by Taiwan's Environmental Protection Administration already have emission factors built in; small and medium enterprises can do basic estimates without hiring external consultants. Starting with a simple spreadsheet record and building toward a complete tracking system is far better than doing nothing.

Conclusion

The choice of waste disposal method is not only a cost question — it is a carbon emission question and increasingly a supply-chain competitiveness question. Compared to incineration, the carbon emission difference per ton of waste that recycling can avoid is very significant. This difference has real impact on ESG reports, supply-chain audits, and future carbon levy calculations.

Approaching waste from a carbon footprint perspective, the most direct factory actions for reducing carbon emissions are: clarify current waste disposal methods; shift recoverable waste into the recycling stream; build tracking records. These three steps require no large investment but deliver concrete improvement in your carbon footprint numbers — and give you data to present when customers ask.

For systematic carbon footprint calculation, consult Taiwan EPA carbon accounting tools or the GHG Protocol framework. For the financial benefits of waste recovery, see: How Much Can a Factory Save by Implementing Scrap Recovery? For the overall circular economy framework, see: What Is a Circular Economy? How Factory Waste Becomes Value Instead of Cost.