Menu

Cloghane Wastewater Treatment System Upgrade – Integrated Constructed Wetland (ICW)

Cloghane wastewater system requires upgrading. The existing system was built in the 1930s and provides negligible wastewater treatment prior to discharge into Brandon Bay.

An Integrated Constructed Wetland (ICW) is recommended following a feasibility study. This study was commissioned by CFLTT and funded by NEWKD through the LEADER Rural Development Programme. The proposed ICW is to treat and manage combined wastewaters from the village of Cloghane. An ICW will provide a sustainable and cost-effective treatment system for the village, while also providing a range of ‘ecosystem services’ including those of significant amenity, recreation and education for the local community. The proposed ICW will be a sustainable and robust wastewater infrastructure facilitating much desired development in the area.

VESI Environmental were tasked to supply a preliminary ICW design strategy that would meet social, economic and environmental needs in a coherent and sustainable manner. ICWs are a series of shallow surface-flow wetlands, planted with native wetland plant species that functions in the same manner as a naturally occurring wetland. These series of planted wetland areas are effective at treating and cleaning influent water through various physical, chemical and biological processes. ICWs strive to achieve a landscape-fit and encourage habitat enhancement/restoration and biodiversity as well as the provision of various ecosystem services. Therefore, in addition to a sustainable method of wastewater treatment, Cloghane village would benefit from the enhancement of the local environment and the opportunity to advance amenity and recreation for the local community and visitors.

The lands assessed as part of the feasibility stage lie to the west of the village. The proposed ICW could provide for a future capacity of up to 600 PE (population equivalent). While the current full

-time resident population is about 60 the seasonal and tourist numbers are much higher. The ICW is designed to accommodate for the seasonal population variation and to allow for future expansion of the network to include other properties, tourism growth and future development. The proposed scaling for this loading requires a 14,000m2 treatment area and a c. 4.5Ha of land.

The preliminary ICW design includes five wetland treatment cells, where wastewaters will be pumped to the ICW via a rising main and gravity fed throughout the system. A new pump station, rising main and upgraded pipe network will be included as part of the works.

 

Proposed ICW site layout

The ICW and associated works will require planning permission (next stage), with tender and construction stages to follow. The main works for the ICW site will include:

  • Earthworks to build, shape and secure the wetland cells
  • The embankments are largely constructed with the on-site material and the embankments top dressed with suitable granular quarry material (for access purposes).
  • The wetland cells will be planted with native plant species and the surrounding areas landscaped to integrate with the local environment and enhance the habitat and amenity values.
  • The outfall from the last ICW cell will be to the existing outfall point at Brandon Bay.

The design and development of the ICW will apply the core principles of the ICW concept that are:

  1.  The explicit integration of ‘all inflowing water management’.
  2.  ‘Landscape‐fit’ and
  3.  ‘Biodiversity’.