Análise de método não destruitivo (MND) aplicável ao sistema de esgotamento sanitário.

Abstract

The objective of this study was to analyze the potential of the Non-Destructive Method (NDM) applied to Sanitary Sewer Systems (SSS), which comprise the collection, conveyance, and treatment of sanitary wastewater. Conveyance is typically carried out through collector networks, force mains, and outfalls, which traditionally rely on the open-cut trenching method. This conventional approach requires considerable implementation time and extensive earthworks, resulting in socio-environmental impacts and, in some cases, making construction unfeasible. With the development of new construction techniques, the Non-Destructive Method (NDM) has emerged as an alternative that minimizes trench excavation and is suitable for the installation, maintenance, and rehabilitation of underground pipelines, providing reduced environmental impact and lower social costs, in addition to execution cost savings. This article analyzes the application of NDM in sanitation works in order to evaluate its economic feasibility, present its principles and characteristics, and compare its performance in terms of efficiency and costeffectiveness. The research was conducted using data collected throughout the execution of a sewer collector installation project in the Boa Viagem district, Recife, Brazil, based on field observations, technical records, and the preparation of an implementation report. The study evaluates the application of NDM in the installation of sanitary sewer networks in Recife through the monitoring of a project executed using horizontal directional drilling. The main technical aspects of the method were analyzed and compared with the conventional system in terms of productivity, execution, and costs. The results indicate that for depths greater than 4 m, NDM demonstrates higher economic feasibility, with a significant reduction in excavation volumes, reduced need for shoring, and productivity up to five times higher, resulting in a total cost approximately 9% lower than that of the traditional method. TheThe Non- Destructive Method shows strong potential for application in urban areas, highlighting its economic, environmental, and social advantages.