Research indicates that non-recyclable waste can help reduce carbon emissions in the cement industry.

Australian researchers state that non-recyclable landfill waste can aid in the production of low-carbon cement. Utilizing Refuse Derived Fuel (RDF) in cement production helps reduce the carbon footprint of an industry that heavily relies on fossil fuels. The researchers point out that clear standards are vital for supporting the broader and more responsible use of waste-derived fuels. Cement manufacturing is estimated to account for 8% of global carbon dioxide emissions, primarily due to the need to burn key components in massive kilns at extremely high temperatures. Researchers are turning their attention to waste as a fuel source to reduce carbon emissions in cement production.

RDF is made from processed non-recyclable waste. Cement kilns can use these fuels alongside traditional fuels in a process known as co-processing. Researchers at the University of Adelaide investigated whether fuel derived from non-recyclable waste could make cement production cleaner and reduce waste sent to landfills. They conducted a literature review of over 200 research articles published between 1991 and July 2025. The findings indicate a growing interest in RDF as a means to reduce landfill waste and decrease fossil fuel use in cement production.

The Connection Between Waste Management and Industrial Decarbonization

According to her analysis, Geethmi Thisakya, a PhD candidate at the University of Adelaide's School of Civil, Environmental and Mining Engineering, states that waste management can be linked to industrial decarbonization. She noted, "Previous research has highlighted the potential of derived fuels to transform suitable waste into useful resources rather than sending them to landfills." However, she cautioned that simple fuel substitution is not enough. For RDF to contribute to reducing carbon emissions, the study indicates that consistent quality, clear regulations, and stronger evidence of environmental and economic impacts are needed.

The study also examined challenges that could affect the use of waste-derived fuels in cement production. The research found widespread confusion between Refuse Derived Fuel (RDF) and Solid Recovered Fuel (SRF), the latter being a more standardized type of waste-derived fuel. While both can be used in cement manufacturing, inconsistent terminology and varying quality standards complicate comparative studies, regulatory interpretations, and ensuring fuel quality consistency. The researchers stated that clear standards are essential for supporting the broader and responsible use of waste-derived fuels.

Challenges Facing the Cement Industry

Thisakya stated, "Cement manufacturers need to be confident that alternative fuels will perform consistently, meet environmental requirements, and support safe and reliable production." However, she warned that more work is needed before the cement industry can confirm RDF as a reliable alternative to fossil fuels. She pointed out, "Developing stronger quality assurance systems and clearer regulatory frameworks will help the industry make informed decisions regarding the use of waste-derived fuels." The results of the study have been published in the International Journal of Building Pathology and Adaptation.

Meanwhile, scientists at ETH Zurich are turning to the smallest organisms on Earth to establish sustainable cities, utilizing bio-cement as an alternative to reduce the industry's carbon footprint. Researchers have developed a 3D bioprinting process that uses customized bio-ink made from water, natural resins, sand, and live bacteria to create bio-cement elements. In a second approach, they use robotic arms to spray alternating layers of sand, bacteria, and mineralization agents to produce bio-cement.

Potential and Challenges of Waste-Derived Fuels

The cement industry is a significant source of global carbon emissions, and shifting to using non-recyclable waste as fuel could substantially reduce its carbon footprint. The research indicates that Refuse Derived Fuel (RDF) not only reduces landfill waste but also decreases reliance on fossil fuels. However, to effectively utilize these resources, consistent quality standards and clear regulations need to be established to ensure environmental and economic sustainability. Addressing these challenges will have profound implications for the future development of the cement industry and its environmental impact.