2026-02-232026-02-232016-01-17https://repositorio.ifal.edu.br/handle/123456789/1397This study presents a technical diagnosis of irregularities associated with the improper use of grease traps and their impacts on the performance of the sanitary sewer system in a gastronomic hub in the city of Maceió, state of Alagoas (AL), with a focus on Doutor Antônio Gomes de Barros Avenue, popularly known as Amélia Rosa Avenue, in the Jatiúca neighborhood. The study area is characterized by a high concentration of bars and restaurants, which results in significant generation of effluents with high loads of oils and fats (FOG), widely recognized as one of the main causes of obstructions in sewer collection networks.The research adopted a mixed methodological approach, combining quantitative and qualitative analyses of operational data provided by the utility company responsible for the service. A total of 417 occurrences recorded between January 2023 and October 2025 were analyzed, extracted from the operational platforms Field Service and TsOne/CRM. The occurrences were technically reclassified according to the type of service performed, probable cause, operational effect, recurrence, and compliance of building pre-treatment systems, with emphasis on the evaluation of grease traps in light of the criteria established by ABNT NBR 8160.The results indicated a predominance of sewer unclogging services, which accounted for more than 50% of the analyzed occurrences, evidencing high recurrence in certain sections and addresses. Grease was identified as the main cause of obstructions, often associated with the absence of grease traps, undersizing of existing devices, and the lack of adequate maintenance routines. It was also observed that a significant portion of the irregularities was not formally recorded in a standardized manner, characterizing technical underreporting, which compromises sanitary monitoring, operational planning, and the adoption of effective preventive actions.It is concluded that the identified failures are systemic in nature and are directly related to the inadequate management of building pre-treatment systems in areas with a high density of food service establishments. These failures result in operational, environmental, and sanitary impacts on the public sanitary sewer network. The study highlights the need to strengthen inspection actions, improve compliance and resizing of grease traps, implement periodic maintenance plans, and promote greater integration among the utility company, regulatory agencies, and users as essential strategies to reduce the recurrence of obstructions and to improve the efficiency and sustainability of the system.ptAttribution 3.0 BrazilEngenharia CivilEngenharia sanitáriaCaixas de gorduraEsgotamento sanitárioRedes coletoras – ObstruçãoGordurasRedes coletoras - ObstruçãoGestão de efluentesSewage systemGrease trapsfatsFatsFats oils and grese (FOG)Sewer network blockagesWastewater managementTrabalho de Conclusão de CursoENGENHARIAS::ENGENHARIA CIVIL