Remodeling Project for the Galegos Wastewater Treatment Plant (WWTP)

Municipality of Marvão

Introduction

This technical project consisted of developing the detailed design for the remodeling of the Galegos Wastewater Treatment Plant (WWTP). The intervention included defining the layout of the outfalls and rising mains, as well as sizing a new compact treatment unit, ensuring an integrated solution for the collection and treatment of domestic wastewater.

Context and Need

The need for the project was based on the population growth of the region, designed to serve an equivalent of 100 inhabitants, and the urgency of ensuring compliance with current environmental legislation (Decree-Law No. 152/97). Given the topographical characteristics of the terrain, it was necessary to design a network of outfall pipes approximately 991 meters long and a 114-meter-long rising main. The central objective was to replace or optimize existing infrastructure to ensure adequate flow velocities and self-cleaning, protecting the receiving environment from improper discharges.

Summary of the Project Completed

The project materialized through the implementation of a sanitation solution comprised of transport infrastructure and an advanced treatment unit.

• Outfalls and Elevation: Installation of three new PVC outfalls and a cast iron (FFD) elevation pipeline. To overcome topographical differences, a Compact Pumping Station (EEC) in polyethylene was installed, equipped with two grinder pumps with explosion-proof motors and level control via pressure switch.
• Biological Treatment: Implementation of an extended aeration system, a technique that allows for optimal purification efficiency with low sludge production. The treatment is carried out in a sequential biological reactor where the aeration (via fine bubble diffusion with a submersible injector) and sedimentation phases occur cyclically (4 cycles per day).
• Treatment Stages: The process includes an initial manual screening to remove coarse solids, followed by aerobic biological treatment that converts organic matter into stable products, ensuring a high-quality final effluent.
• Complementary Infrastructure: Construction of a ventilated support building for the electrical control and protection panel. The system was equipped with automated features that allow for continuous operation, requiring sludge removal only every 2 years.

The execution of the works also involved rigorous care in the assembly, with the units being placed on sand beds and anti-corrosion protections being applied to ensure the longevity of the installation.

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