Optical monitoring of detergent pollutants in greywater

What is it about?

Every day, our washing machines and dishwashers produce a significant amount of wastewater, known as greywater, that flows directly into drainpipes without any treatment. Among the many pollutants present in this greywater, detergents are one of the most common. Traditionally, scientists have used complex analytical chemistry procedures to measure pollutant levels. This approach is time-consuming and requires samples to be transported to specialized laboratories, making real-time monitoring challenging. We explored a new monitoring method using optofluidic devices based on planar Fabry-Perot microresonators. These devices operate by analyzing the way light passes through them. We were able to determine the concentration of soap in wastewater from different stages of a washing machine cycle, both with and without clothes.

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Photo by Sigmund on Unsplash

Photo by Sigmund on Unsplash

Why is it important?

By integrating these microfluidic devices into the design of household appliances, such as washing machines and dishwashers, we could potentially reduce our environmental impact on water resources. This innovative approach offers a promising solution for managing wastewater more efficiently and sustainably in our daily lives.