Salix grew tens of thousands of native wetland plants for a Integrated Constructed Wetland (ICW) to treat wastewater as part of a Yorkshire Water Wastewater Treatment Works (WwTW).
Salix grew tens of thousands of native wetland plants for a Integrated Constructed Wetland (ICW) to treat wastewater as part of a Yorkshire Water Wastewater Treatment Works (WwTW). The constructed wetland has since won 8 environment and sustainability awards.
Yorkshire Water has created an innovative project at Clifton WwTW, utilising an Integrated Constructed Wetland (ICW) for water treatment.
Traditional solutions are dependant on carbon intensive materials such as concrete for their construction. They use an array of finite chemicals during operation with comprehensive mechanical process equipment. Instead, ICWs use large areas of wetland plants to process water, providing a natural solution with limited or no mechanical parts.
Although traditional solutions are common, they only focus on water processing, where constructed wetlands can provide multiple benefits to across water quality, habitat, carbon sequestration and amenity space. The project was chosen to act as a pilot study to determine whether ICWs could replace traditional solutions at scale across Yorkshire Water’s treatment plants.
Salix grew 24,000 native wetland plants of a specialist plant mix, chosen for water treatment. The dense plant matrix increases the roughness of the constructed wetland, increasing the water retention time and maximise the water treatment using biological processes.
It is hoped that Integrated Constructed Wetlands will become the norm, given the multiple benefits that can be gained using nature-based solutions to treat waste.
Native Plant Nursery
Salix has the largest native plant nursery in the UK, supplying plants across a wide variety of habitat types for habitat creation.
A natural and wildlife enriched habitat has been created on 4000m2 of slightly boggy land that turns a problematic waste product into something that brings significant benefits to wildlife and people.
Using a nature-based solution provided many benefits. The project enhances the local environment, with a biodiversity net gain score of 2.28. It also only required 21% of the embodied carbon to construct, compared with a traditional treatment works.
We have worked with Salix on a number of projects throughout East Anglia over the last 6 years, and we have always found them to be highly professional and competent. We have used their services as suppliers of quality wetland plants, with a traceable provenance, and as contractors to both supply and plant the wetland plants. In addition we have always relied on the technical advice and knowledge of David Holland, in particular, to help answer queries from our clients regarding wetland planting schemes we have been involved in, this is an added value part of their service, for which we are grateful.UPM Tilhill
We invited Salix to re-landscape the watercourse through a design and build project. The works to the watercourse were completed within two weeks of starting on site and, despite a number of prolonged heavy rain events both during and after the works, the pre-established coir rolls and pallets all began putting on new growth within a matter of days providing the watercourse with instant channel vegetation and protection to the toe of the banks. The VMax reinforcement used to stabilise the slopes has also prevented any erosion to the sandy soil beneath and has allowed the rapid establishment of grass which wouldn’t have otherwise been possible.South Ribble Council
Your staff are always friendly, knowledgeable and helpful and we have always been pleased with the service and the quality of the wetland plants and planting services. Technical knowledge on erosion control is also excellent. Keep up the good work!Living Water Ecosystems Ltd
Atkins has worked with Salix on a number of projects, collaborating on design concept, trialling and implementation. We have found their experience valuable in delivering cost effective and environmentally functional solutions.Atkins
HydraCX gave an immediate impression the embankment was grassed, making it more visually pleasing to our travelling customers. The rapidity of grass growth was exceptional and it added additional strength to the slope surface.Network Rail
Excellent overall performance – very approachable and offered a good sustainable solutions to rectify a significant erosion scour to the river foreshore without comprising the existing flood defence. Carried out work to agreed timescale and budget. Certainly would value their future input.Environment Agency, Leeds
We used HydraCX for the first time on a Network Rail project in Chipping Campden. We wanted to establish vegetation growth as quickly as possible on a slope with poor ground conditions without the need for importing topsoil due to possession time constraints. HydraCX provided an excellent growing medium for rapid germination.Carillion Rail