Construction of Submarine Outfalls

submerged applications

Submarine outfalls: Solutions for wastewater transport

At Eurohinca, we offer specialized services in the construction of submarine outfalls, designed for the closed and efficient transportation of wastewater. Our polyethylene pipes are designed to safely connect the wastewater treatment plant outlet to the sea, ensuring effective discharge and minimizing environmental impact. Rely on our advanced solutions to ensure a robust and durable infrastructure for subsea outfall projects.

Subsea outfalls with polyethylene pipelines

Pipelines for transporting wastewater from different industries from the treatment area to the discharge area in large bodies of water such as oceans, seas and lakes, in such a way that it does not adversely affect the local ecosystem. Trenchless technology is the most advisable as it minimizes the environmental impact. It greatly reduces the uncertainty inherent to and associated with dredging and/or anchoring maritime works. Within this group of works that EUROHINCA executes, we can also include water catchments for different processes such as: desalination plants, fish farms, industrial refrigeration systems.

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Frequently asked questions about submarine outfalls

What is a submarine outfall and what is its main function?

A submarine outfall is a pipe or system of pipes that is installed underwater to transport wastewater from a treatment plant to the sea or other body of water. Its main function is to evacuate wastewater safely and efficiently, minimizing environmental impact and ensuring adequate treatment prior to release into the aquatic environment.

Polyethylene pipes are chosen for the construction of subsea outfalls due to their high corrosion resistance, durability and flexibility. Polyethylene is resistant to the effects of salt water and adverse marine conditions, ensuring long service life and reliable performance in closed sewage conveyance.

The installation of a submarine outfall generally follows these steps:

  1. Study and planningSubmarine terrain evaluation and outfall design.
  2. ManufacturingProduction of pipes and necessary components.
  3. TrenchadoExcavate a channel in the seabed for pipe laying.
  4. InstallationLay the pipes in the channel and join them according to the design.
  5. Testing and reviewSystem check to ensure that there are no leaks and that the system is working properly.
  6. Closing and coverageFilling the channel and securing the pipes in place.

Submarine outfalls help reduce the environmental impact of wastewater by:

  • Dilute and disperseThe wastewater is mixed and diluted in seawater, reducing the concentration of pollutants.
  • Minimize contaminationBy releasing wastewater into the open sea, the accumulation of pollutants near the coast is prevented.
  • Improving treatment: They ensure that treated wastewater is released in areas where its impact is less.

Subsea outfalls require periodic maintenance to ensure optimal performance. This includes:

  • Regular inspectionsVerification of the state of the pipes and connections.
  • Cleaning: Elimination of sediments and other accumulated residues.
  • Pressure testingTo ensure that there are no leaks. Maintenance is typically performed every 1-2 years, although it may vary depending on environmental conditions and use of the outfall.

To ensure the structural integrity of the submarine outfalls, several measures are implemented:

  • Robust designUse of resistant materials and adequate structural design.
  • Protective coatingsApplication of anti-corrosion coatings on pipelines.
  • Continuous monitoringImplementation of monitoring systems to detect possible problems.
  • Repairs and reinforcementsRepairs and reinforcements when necessary, based on regular inspections.