From Waste to Energy

There’s a quiet revolution taking place around the world in how we perceive and handle waste. It’s now no longer something we simply throw away, but rather increasingly valued as a resource for generating energy and securing a more sustainable future. Regardless of whether it involves incinerating household refuse, converting biomass into solid fuels, or transforming
plastics and other residual materials into liquid fuel, these various “waste-to-energy” technologies offer exciting alternatives to fossil fuels and promote the circular economy. 

In our 2-part blog article, we look at some of the leading approaches and give a real-world example of how elemental analysis underpins advanced fuel research and the energy transition.

With a long track record, incineration remains one of the most developed methods for recovering energy from unwanted material. Exhaust gases pass through advanced systems that capture heat, filter out pollutants, and convert steam into electricity or supply it to local heating networks.

A key advantage of incineration is its ability to handle a wide variety of waste, but operators must continuously be on guard against potentially harmful impurities in the fuel. Regular testing and optimization are essential to ensure not only the best possible combustion efficiency and heat value, but also compliance with stringent environmental regulations. Carbon, hydrogen, nitrogen, sulfur, and oxygen (CHNSO) analysis of waste fuels, biomass fuels, and fossil fuels provides a basis for heat value calculation, while chlorine and other halogens require attention, as they cause corrosion in the combustion furnace. These measurements also indicate the optimal mixing ratio of waste fuels with supplementary biomass and fossil fuels, helping operators optimize combustion behavior and reduce the risk of corrosion damage.

While the goal remains a genuine circular economy in which materials are reused and recycled wherever possible, incineration is preferable to landfill, where organic matter decomposes and releases methane. Furthermore, using more sustainable raw materials, such as biomass, is better for the environment. Ultimately, the success of modern incineration plants rests on their ability to reduce pollution to a minimum while converting an increasing stream of waste that is not suitable for other recycling technologies into a valuable source of energy.

Turning wood chips, agricultural residues, or even paper pulp into solid fuels, is another way towards cleaner energy. Unlike fossil solid fuels, such as coal, biomass offers a significant climate advantage by relying on biogenic carbon – carbon that is already part of the short-term carbon cycle. When biomass is burned, it releases CO₂, but this carbon was previously absorbed from the atmosphere by plants through photosynthesis. As a result, no “new” carbon is introduced into the carbon cycle, making biomass effectively carbon-neutral when sourced sustainably. In contrast, burning coal releases ancient carbon from the longterm geological carbon cycle that has been locked underground for millions of years, adding new CO₂ to the atmosphere and intensifying climate change.

The determination of C, H, N, and S is part of the standard analysis and characterization of biofuels derived from biomass feedstocks. Due to the variety of different feedstocks, alternative fuels can vary in element concentrations, resulting in differences in the quality of the end product. Varying C, H, and N content leads to different calorific values as an indicator for the energy potential. The S and N must be strictly controlled due to the environmental impact during combustion. Furthermore, S and N can lead to corrosion in the combustion furnace when alternative solid fuels are being used.

Generating energy from waste is no longer a novelty; it's becoming an integral part of many industrial programs. 

But success depends as much on engineering and plant design as it does on accurate, consistent data about the materials at play. 

In our second part of the article, we will focus on another technology: Sustainable Aviation fuel, converting renewable feedstocks and used cooking oil into sustainable liquid fuels.