Pizza has long been a staple food in American culture, with roughly 43 million Americans consuming at least one slice per day. However, the environmental impact of pizza consumption goes beyond just the ingredients themselves. The pizza boxes used to deliver these cheesy delights contribute to a significant portion of waste that cannot be easily recycled due to contaminants like grease and cheese. Despite the challenges, researchers at Idaho National Laboratory (INL) have set out to tackle the pizza box recycling problem head-on.

The Research Study

The recent study published in the Journal of Cleaner Production outlines a new approach to decontaminating cardboard using material separation capabilities. The goal is not only to make pizza consumption more eco-friendly but also to potentially save lives by repurposing waste for military use. The project originated from the Defense Advanced Research Project Agency (DARPA) ReSource Program, which aimed to convert warfighter waste into edible nutrients and other useful items. By separating grease, cheese, and other contaminants from pizza boxes, the researchers hope to address waste reduction across various industries.

The Experimental Process

The experimental system developed by Aaron Wilson and his team at INL utilizes dimethyl ether (DME), an environmentally friendly chemical, to clean contaminated cardboard boxes. The system consists of two vertical stainless-steel reactors, with one focusing on removing liquids from solids using a solvent, and the other extracting the solvent from the liquids. By loading broken-down pizza boxes into the first reactor and adding the solvent, the team triggers a chemical reaction that draws out the contaminants. The cleaned cardboard is then separated from the solvent, which can be reused in the process to clean more materials.

Compared to traditional water washing methods, DME extraction offers a more efficient and sustainable solution. Water washing often results in high energy costs and large volumes of wastewater containing diverse contaminants. In contrast, the DME extraction process operates in a closed loop system, recycling the solvent to clean new waste items without generating additional wastewater. This process can be scaled to any size and offers a more environmentally friendly alternative to traditional cleaning methods.

The success of the pizza box cleaning case study opens the door to future projects aimed at converting waste into reusable materials, including military waste repurposing initiatives. By validating the system for battlefield use, researchers like Jeff Lacey are working to make the process more lightweight and portable. Identifying components that can be replaced with lighter alternatives, such as carbon fiber pressure vessels, will be crucial for deploying this technology in military settings. Additionally, the solvent extraction process may have applications beyond pizza box recycling, including more efficient battery waste disposal.

The innovative research conducted by the team at INL has the potential to revolutionize the way we approach waste management and recycling. By addressing the challenges of pizza box contamination and developing a scalable solution, researchers are paving the way for a more sustainable future. The implications of this study extend beyond pizza boxes to various industries, including military waste repurposing and battery recycling. With a focus on material separation and closed-loop systems, the opportunities for reducing waste and creating reusable resources are endless. This is just the beginning of a journey towards a greener, more environmentally friendly approach to waste disposal.

Chemistry

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