The attempt to manage and reduce waste as part of responsible production are one of the main points on the 2030 agenda for Sustainable Development. Athi 'Nur Auliati Rahmah (Physics Education Study Program Student), Bian Itsna Ashfa Al Ashfiya (Physics Study Program Student) and Muhammad Rizki (Physics Study Program Student) has successfully presented their innovative concept on tofu factory waste purification and earn 2nd  place at UNY Scientific Fair (UNYSEF) 2021. This event organized by the Student Research Activity Unit (UKM-P) UNY.