valdellerose constructed wetland 4.jpg



GWT Gold Sponsor at the ICWS2022


icws22 lyon






Treatment Wetlands are natural, biological treatment systems and, as such, undergo changes as they mature. Similarly, external factors such as deviations in the hydraulic and contaminant load characteristics of wastewater fed to them can have an impact on their capability to perform to required standards. Often an event, such as a sludge spill or upstream failure can substantially affect operation and performance. The discharge standards themselves may also be altered by the regulator demanding increased levels of performance from the system. All of the above can lead to the need for varying levels of system refurbishment.

Having constructed, monitored and operated thousands of wetland systems Global Wetland Technology has widespread knowledge of refurbishment options and the skills and techniques required to undertake them in the most cost and technically efficient manner. Refurbishment does not always involve a remedial action but can also involve an enhancement or upgrade of the system such as altering the hydraulic design to address increased effluent volumes or retrofitting aeration systems to manage increased contaminant loads.

In Global Wetland Technology’s experience the following stages in refurbishment are required.

  • Assess the condition of the wetland system
  • Review historical performance including variability in loads
  • Review with the client future plans - including predicted loads over the next 5-10 years
  • Specify and cost a refurbishment/enhancement plan and review with the client, set timeline






GWT events @ ICWS2022




7/11  9am  Anacleto Rizzo   (Keynote)

Wetland community expertise in the new Nature-Based Solution and Circular Economy vision: links and new research and design trends


7/11  10.40am  Dion van Oirschot

MULTISOURCE: Aerated wetland treating black and grey water for reuse at campsite Belgium


07/11   11:40am  Heike Hoffman

The potential of the French Wetland System for reuse - Results of a long-term project in the Peruvian arid coast area


7/11  4pm Heike Hoffman

Operational experiences with a sludge treatment wetland as part of a municipal WWTP in Brazil


7/11  4.30pm Fabio Masi

Water Projects Europe: NICE / MULTISOURCE


9/11  2pm Steen Nielsen

Treatment of industrial sludge in a pilot Sludge Treatment Wetland planted with Phragmites australis and Schenoplectus californicus


9/11  2pm Riccardo Bresciani

Reed beds for drying sludge from a winery wastewater treatment plant in Spain: the WETWINE project


9/11   4.40pm  Taxiarchis Seintos

Application of a full-scale UASB and two-stage constructed wetland system for water reclamation and nutrient recycling of domestic wastewater in arid areas


9/11  5pm Simos Malamis

Investigation of the use of different filling materials in unsaturated vertical flow constructed wetlands for the treatment of UASB effluent from domestic wastewater

T. Seintos, E. Statiris, F. Masi, C. Noutsopoulos, S. Malamis


9/11 5pm Scott Wallace

Practical aspects in the determination of first-order removal rate coefficients (k) for horizontal flow treatment wetlands


10/11 11.20am Fabio Masi

Electroactive and intensified pilot-scale constructed wetlands for the treatment of high loads of septic tank effluent


10/11 2.20pm Alain Petitjean

Intensified French Treatment Wetlands - Influence of operating parameters on nitrogen removal


10/11 4pm  Andy Freeman

Treatment of de-icer contaminated runoff at a UK airport using intensified Nature Based Solutions - A 10-year operational performance review



P4: Coupling French Reed Bed and Short Rotation Plantation for developing circular economy of wastewater in India: A case of PAVITR prototype / Anacleto Rizzo

P39: Constructed wetlands for the treatment of combined sewer overflow upstream of centralised wastewater treatment plants / Chiara Sarti