Chemical Siblings: exploring interactions between toxic Selenium and Sulfur in wastewater to promote recovery

Selenium and sulfur are very similar elements: you could call them chemical siblings. Both are useful as well as harmful: our bodies need them, but in the wrong form or concentration they make us ill. Because they are so similar, they also react with each other, for example in biological removal processes from wastewater. I want to study whether these interactions also make them want to be together in a molecule, or even in a crystal, and whether selenium can ''hitch a ride'' with sulfur. That would make recovery of selenium a lot easier, and lead to circular selenium.