Recycling PVC waste could reshape China’s carbon footprint by 2050

China generates more polyvinyl chloride waste than any other country, and a new modeling study suggests that how each province handles that waste could make a substantial difference to the nation’s environmental footprint. Researchers built an integrated material flow analysis and life cycle assessment covering all 31 mainland provinces from 2020 to 2050, tracking PVC waste from five sources—construction, household, industrial, agricultural, and medical—through landfill, incineration with energy recovery, mechanical recycling, and an emerging chemical recycling route. Their central finding is that mechanical recycling delivers the lowest environmental footprint of any treatment option, while chemical recycling becomes increasingly competitive as China’s power grid decarbonizes.

The scale of the challenge is considerable. In 2020, China treated roughly 11.51 million tonnes of PVC waste, a figure the model projects will rise to 20.59 million tonnes by 2050 at an annual growth rate of 2.70 percent. Construction waste dominates the stream, accounting for 51.70 percent of the total, followed by household waste at 25.83 percent and industrial waste at 14.30 percent. Agricultural and medical sources contribute the remaining 6.58 and 1.59 percent respectively. Because PVC contains high levels of chlorine, its end-of-life pathways pose greater environmental and health risks than those of many other commodity plastics, and contamination frequently limits the feasibility of mechanical recycling for construction-related material.

The study’s material flow analysis shows what happens when treatment rates shift. Recycling rates for construction and household PVC waste rise from 11.80 percent in 2020 to 80.00 percent by 2050 under the modeled scenarios, while agricultural recycling climbs from 80.00 to 96.00 percent. All medical PVC waste is assumed to be incinerated for energy by 2050. As a result, the amount of mismanaged PVC waste falls from 1.07 million tonnes to 0.24 million tonnes, a reduction of 77.53 percent, and the amount released into the environment drops from 9.46 million tonnes to 4.22 million tonnes. Meanwhile, the volume converted into regenerated resources—PVC particles, pyrolysis oil, sodium chloride, coke, and gas—jumps from 1.84 million tonnes to 16.13 million tonnes, an increase of 778.61 percent.

On the environmental side, the researchers quantified four endpoint footprints: carbon, human health, resource depletion, and ecosystem quality, using the ReCiPe 2016 method alongside the IPCC 2021 global warming potential framework. In the baseline year, energy recovery contributed the highest gross carbon emissions but also generated a significant offset of −210.13 percent from recovered electricity. Mechanical recycling, despite handling only 14.13 percent of the waste, contributed −51.49 percent to the total carbon footprint because regenerated PVC particles offset virgin production by 62.92 percent. As recycling rates climbed from 16.10 to 79.78 percent, the total carbon footprint of PVC waste management fell from 3.87 million tonnes of CO2-equivalent to −0.24 million tonnes, with mechanical recycling alone delivering reductions of 13.35 million tonnes of CO2-equivalent.

The scenario analysis reveals a counterintuitive dynamic. Under the high-carbon grid scenario, which assumes continued fossil-fueled development, chemical recycling produced the highest carbon footprint at 8.11 million tonnes of CO2-equivalent in 2050, driven by heavy consumption of raw materials and electricity. Yet the large offset from regenerated electricity under that same scenario made energy recovery’s overall footprint lower than in decarbonized futures. Under the medium- and low-carbon scenarios, chemical recycling’s carbon footprint dropped by more than 42.95 percent compared with the high-carbon case, while energy recovery’s offset from regenerated electricity fell by 88.61 and 96.57 percent respectively. This means the total carbon footprints under the decarbonized scenarios were actually higher than under the high-carbon one, because cleaner electricity shrinks the credit that recycled materials and recovered power can claim against virgin production.

Provincial heterogeneity proved to be a decisive factor. In 2020, the regions with the largest environmental footprints clustered in coastal and central China, with Guangdong recording the highest carbon footprint and Xizang the lowest. By 2050, under all three grid scenarios, the burden shifts westward: Xizang emerges with the highest carbon footprint while Jiangsu has the lowest. The researchers attribute this reversal not to changes in waste volumes—Guangdong, Jiangsu, and Xizang maintain the same ranking in both years—but to differences in how each province’s electricity mix evolves. Energy recovery showed the largest regional variation in carbon footprint at 152.23 percent, followed by chemical recycling at 43.65 percent and mechanical recycling at 21.21 percent.

Electricity-related footprints changed dramatically in some provinces and barely at all in others. In Guangdong, the electricity-related carbon footprint shifted by 10.95 percent under the high-carbon scenario, −86.22 percent under the medium-carbon scenario, and −94.45 percent under the low-carbon scenario. In Xizang, the corresponding changes were only 4.91, −4.91, and −4.91 percent, reflecting a grid that was already relatively clean. Sensitivity analysis confirmed the pattern: a 10 percent variation in electricity-related footprints produced a 12.72 percent change in the carbon footprint, a 58.74 percent change in human health impacts, and a 22.83 percent change in ecosystem quality, while resource depletion responded more strongly to the total volume of PVC waste.

The study also breaks new ground by modeling the downstream logistics of recycled materials, an element previous assessments largely ignored. Assuming all PVC waste is processed through chemical recycling, the researchers calculated the transport carbon footprint of moving regenerated pyrolysis oil and sodium chloride between and within provinces. Using fossil-fueled vehicles, transporting regenerated oil generated 16,498.72 tonnes of CO2-equivalent in 2020, rising to 501,692.90 tonnes by 2050. Sodium chloride transport produced 5,599.45 tonnes in 2020 and 170,267.87 tonnes in 2050. Provincial delivery dominated oil flows because local petrochemical demand absorbs most regional output, while interprovincial transfer dominated sodium chloride flows because several provinces must import it to meet demand.

Electrifying the logistics fleet changes the picture substantially. Under the low-carbon grid scenario, the combined transport footprint for both materials peaks in 2040 and then declines, reaching 118,071.61 tonnes of CO2-equivalent in 2050, or 0.93 percent of the total chemical recycling footprint. Under the high-carbon scenario, electric vehicles still outperform fossil-fueled ones across every year modeled. The researchers conclude that regardless of scenario, emissions from electric vehicles are always lower than those from diesel equivalents, and they recommend building recycling plants in each province to shorten transport distances while electrifying the fleet.

The findings carry clear policy implications. Mechanical recycling should be prioritized for clean, low-contamination PVC streams, supported by better collection and sorting systems. Chemical recycling, currently constrained by high energy and raw material consumption, becomes a viable complement after roughly 2025 under decarbonized grids, particularly for mixed and contaminated waste that mechanical recycling cannot handle. Energy recovery, by contrast, loses its environmental advantage as renewable electricity expands and the offset from power generation shrinks by up to 96.6 percent, making it best suited as a transitional measure with strict emission controls. The authors emphasize that differentiated provincial strategies—tailored to local waste composition, treatment capacity, and energy policy—are essential for aligning PVC waste management with China’s carbon neutrality and circular economy goals, and that their framework could be adapted to assess plastic waste strategies in other large, diverse economies.

Subject of Research: Environmental footprints and mitigation potential of PVC waste recycling across Chinese provinces from 2020 to 2050

Article Title: Assessing the potential environmental benefits of PVC waste recycling in China toward carbon neutrality

Article References: Han, M., Gao, X., Wang, Z., Kumagai, S., Saito, Y., Gu, D., Hu, T., Li, G., Yoshioka, T., & Lu, J. (2026). Assessing the potential environmental benefits of PVC waste recycling in China toward carbon neutrality. Carbon Neutrality, 5(1), Article 10. https://doi.org/10.1007/s43979-026-00164-z

Image Credits: AI Generated

DOI: 10.1007/s43979-026-00164-z

Keywords: PVC recycling, material flow analysis, life cycle assessment, carbon footprint, China, circular economy, chemical recycling, mechanical recycling, renewable energy, provincial heterogeneity, waste management, carbon neutrality