Nicole Welle | July 13, 2020
Researchers at Shinshu University developed a promising new method for removing microplastics from water that involves using acoustics to separate and capture them.
Because microplastics are so small, traditional methods for removing them, like using filters and sieves, have been insufficient in filtering out the majority of microplastics from oceans and rivers. Filters are too big to filter out tiny particles and are prone to clogging, so they need to be regularly cleaned or replaced and are impractical for large-scale use.
Professor Hiroshi Moriwaki and Associate Professor Yoshitake Akiyama at Shinshu University created a device that uses piezo vibrations to collect microplastics and microplastic fibers. By using acoustics at a force and amplitude appropriate for size and compressibility of the microplastics, they found they could successfully collect it in the middle of a three-channel device, according to an ENN article. This device gathers debris in a middle channel while clean water flows out the two side channels.
This process could greatly improve our ability to filter microplastics from oceans and rivers in the future. However, improvements to the device’s draining system and further developments in its ability to capture tiny nanoplastics must occur before it can be implemented worldwide.