Large volumes of spent acids from semiconductor manufacturing are often treated as waste, even though much of their chemical value remains. This presentation looks at how electrochemical and catalytic processes can be used to regenerate acids and recover metals directly from fab waste streams, allowing these materials to be reused on site or redirected to industrial offtake. Through case examples, it discusses where acid regeneration makes sense, how it fits within regulatory frameworks, and what it can mean for waste reduction, cost, and overall sustainability performance.