Project for the Expansion of the Sewage Network and Construction of the Wastewater Treatment Plant in the Village of Lapa
Municipality of Sernancelhe
Introduction
This technical project consisted of the design and implementation of an integrated solution for expanding the sewage network and constructing a Wastewater Treatment Plant (WWTP) in the village of Lapa. The intervention focused on providing this locality with modern sanitation infrastructure, ensuring the efficient treatment of effluents and the environmental preservation of the region.
Context and Need
The need for this project arose to serve a population of 250 equivalent inhabitants, responding to the urgent need to implement a treatment system capable of rigorously meeting the discharge limits and minimum pollutant reduction percentages established by current legislation (Decree-Law No. 152/97). The central objective was to replace the lack of infrastructure with a stable technical solution, suitable for the flow rates and organic loads of the locality, guaranteeing correct operation even in the face of peak influent loads.
Summary of the Project Completed
The implemented solution was based on a biological treatment system using Extended Aeration, a technique selected for its high degree of purification and low sludge production. The project encompassed the following components:
Treatment System: Utilizing a cylindrical unit made of steel sheet with a volume of 50 m³, where aeration (via fine bubble diffusion with a submersible injector) and sedimentation operations occur cyclically (4 daily cycles of 6 hours).
Purification Stages: The process includes manual screening to remove coarse solids, followed by aerobic biological treatment that converts organic matter into stable products, ensuring a high-quality effluent.
Electromechanical and Civil Infrastructure: Installation of submersible pump units and an electrical control panel with alarm and automation systems. A ventilated support building was also constructed, and gravel paving was carried out on the access roads to the installation.
Waste Management: The system allows for the aerobic stabilization of sludge, reducing the need for removal (estimated every 2 years in steady-state conditions), which can later be used for agricultural purposes.
The work involved rigorous anti-corrosion finishing on the metal surfaces and meticulous leveling of all units to ensure the station’s longevity and functionality.
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