2021 BUDAPEST 20th International Conference on Advances in Science, Engineering and Waste Management (BASEW-21) scheduled on June 23-25, 2021 at Budapest (Hungary) is for the engineers, practitioners, scientists, researchers, scholars,  and students from all around the world and it also includes the industry people to present ongoing research activities, and hence to foster research relations between Academia and industry. The conference is sponsored by Eminent Association of Pioneers (EAP). This conference provides opportunities for the delegates to share new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration. All the submitted conference papers will be peer reviewed by the program/technical committees of the Conference.