Gerenciamento dos resíduos químicos gerados na disciplina de Química Experimental laboratório da UFC Campus Crateús

Abstract

Chemical waste is generated daily in teaching, research and extension activities at universities, being neglected and sometimes incorrectly disposed of in the sewage system without any planning or consent to chemical and environmental risks. The present work aims to propose a management plan for the experimental chemistry discipline carried out in the chemistry laboratory didactic on the UFC Crateús campus. Waste management began with the registration of practices and the recognition of laboratory logistics. Standard operating procedures (SOP) were then developed for each practice, predicting the quantity of reagents, solutions and materials needed and waste management steps. The GUT matrix was used to define treatment priorities per experimental procedure, the first order of prioritization was for the procedure of Chemical Systems and Reactions with the highest PI (Priority Index) 14, the second order of prioritization was the procedures of Identification of Substances, Separation of Substances and Stoichiometry and Yield with IP 10, the third order of prioritization was Periodic properties with IP 9, and the fourth order of prioritization was the Standardization and standardization of Substances and Mass and Volume Measurements with IP 8.Waste management carried out by practice was initiated by the segregation, identification and quantification of reusable waste in other practices of the same discipline or others taught in the laboratory. Waste that could be neutralized was treated and discarded. Solid and liquid separation steps by recrystallization were also carried out, making it possible to recover the solid. Non-reusable and stable liquid waste went through a volume reduction process before being stored. Solid and liquid waste whose treatment is outside the scope of the UFC laboratory in Crateús, is packaged and sent to PEGA (Environmental Management City Hall). After management, it was found that 12% of waste generation is reusable and 34% is neutralized and discarded in the sink and 54.0% is destined for PEGA. Waste management in the experimental chemistry discipline provided waste control through handling, savings in reagent and transportation costs, and reduced environmental damage due to inappropriate disposal.