View the different types of percolation systems used in Ireland

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about percolation systems 

Pressurized Polishing Filters

Pressurized Polishing Filters, commonly referred to as a Low Pressure Pipe System (LPP), are widely used to distribute treated wastewater from a sewage treatment plant into the soil. In this system, effluent is pumped from the Waste Water Treatment plant to either a splitter valve or a manifold. These components then channel the effluent through multiple 32mm laterals, ensuring even dispersion across the bed. While 25mm pipes can also be utilized, they require careful design and maintenance to prevent quicker blockages.

Trench Soil Polishing Filters

A Trench Soil Polishing Filter (TSP) is a conventional method for dispersing effluent from a septic tank or sewage treatment system. This option is particularly suitable for locations where the terrain allows for a gravity-fed outlet from the septic tank or treatment system.

FiberPods Tertiary Modules

FiberPods Tertiary Modules provide an effective solution for treating wastewater to a high standard before it is discharged into the soil. These modules are perfect for constrained sites due to their compact size, making them particularly suitable for areas with limited space or poor soil drainage. Delivered and installed using a truck-mounted crane, FiberPods have a significant advantage over coconut (coco) systems. Unlike natural fibers, the synthetic fibers used in FiberPods do not rot, ensuring durability, long-term cost savings, and greater reliability.

Drip Distribution Systems

Drip Irrigation Systems offer an alternative for distributing effluent in areas with poorly draining soil. Research conducted by Trinity College Dublin demonstrated that drip systems are suitable for most sites in Ireland, particularly those with soil depths of 600 to 800mm and poor soakage. These systems are advantageous on such sites because they distribute effluent evenly through an extensive network of high-pressure pipes with small emitters, allowing for controlled release. Due to the intricate design required, drip dispersal systems should be designed and installed by the same company to ensure proper functionality.

Tertiary Sand Polishing Filters

Tertiary Sand Polishing Filters elevate the wastewater treatment from the system to a higher standard before its final discharge into the soil, making them ideal for sites with limited space due to their small footprint. These filters are particularly effective for areas with poor soakage, as the effluent from a sand polishing filter does not create a biomat or sludge layer, which can hinder soil absorption. However, the primary drawback of sand filters is the quality of the sand used. Inconsistent performance across Ireland has been attributed to contractors using substandard sand. Therefore, the success of a sand filter system hinges on the use of high-quality sand.

Coconut Tertiary Modules

Coconut Tertiary Modules and Peat Tertiary Modules utilize coconut husk or peat fiber to treat wastewater from the system to a high standard before its final discharge into the soil. These modules are ideal for restricted sites due to their compact footprint and are particularly effective for areas with limited space or poor soakage. Unlike sand polishing filters, the effluent from these modules does not form a biomat or sludge layer, which can impede soil absorption. However, a significant drawback of both coconut husk and peat fiber is their limited lifespan, typically lasting only 10 to 12 years, and the high cost of media replacement.

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