Wems Solutions ApS

Wetland ecology · Nature-Based Solutions

Wetlands that clean water and work with nature.

Wems Solutions ApS is an independent, one-person consultancy in wetland ecology and management, led by Professor Emeritus Hans Brix. We specialise in engineered and natural treatment wetlands for water pollution control — Nature-Based Solutions backed by four decades of research.

Get in touch What we do
Professor Emeritus Hans Brix, principal of Wems Solutions ApS
Professor Emeritus Hans Brix

What we do

Wetland expertise, from concept to working system

01

Wetland ecology & management

Scientific consultancy on the ecology, design and management of wetland systems — grounded in research and decades of field experience.

02

Treatment wetlands for water pollution control

Engineered and natural treatment wetlands (constructed wetlands) that remove pollutants from water and protect the receiving environment.

03

Nature-Based Solutions

Harnessing natural processes to manage water and improve the environment — sustainable solutions, from first concept to implementation.

04

Feasibility studies & supervision

Feasibility studies and on-site supervision of constructed wetland projects, in Denmark and internationally.

Track record

Trusted on wetland matters — locally and internationally

Wems has supervised many constructed wetland projects and carried out feasibility studies in Denmark and abroad.

Wems was also the main actor behind the Danish EPA guidelines for constructed wetland systems — work that continues to shape how treatment wetlands are planned and built.

Selected collaborators

  • Danish EPA
  • US EPA
  • DANIDA
  • IAWQ
  • UNDP
  • Municipalities & counties

About

One scientist, four decades of wetlands

Hans Brix

Principal · Professor Emeritus, Aarhus University

Wems Solutions ApS is a one-person consultancy — its work is the work of Hans Brix. For nearly four decades he has researched and taught wetland ecology and constructed wetlands, as Professor of Aquatic Biology at Aarhus University and now Professor Emeritus, and is internationally recognised as a pioneer in constructed wetlands for water pollution control and nature-based wastewater treatment.

He founded the IWA Specialist Group on Wetland Systems for Water Pollution Control in 1986 — now a key international platform in the field — has advised and led projects in more than 20 countries across Europe, Asia, Africa and the Americas, and has published over 300 peer-reviewed papers (h-index 77). He is ranked among the world's leading scholars in his domain.

40 yrs
Research & teaching
300+
Peer-reviewed papers
20+
Countries advised
#2
Globally in Constructed Wetlands (ScholarGPS, lifetime)

Selected publications

Foundational work in constructed wetlands

300+ peer-reviewed papers 33,000+ citations 96 h-index (Google Scholar) View full profile on Google Scholar →
1987
Treatment of wastewater in the rhizosphere of wetland plants — the root-zone method. Brix, H. Water Science and Technology 19(1–2), 107–118.
1989
The use of aquatic macrophytes in water-pollution control. Brix, H. & Schierup, H.-H. Ambio 18, 100–107.
1994
Functions of macrophytes in constructed wetlands. Brix, H. Water Science and Technology 29(4), 71–78.
1994
Use of constructed wetlands in water pollution control: historical development, present status, and future perspectives. Brix, H. Water Science and Technology 30(8), 209–223.
1997
Do macrophytes play a role in constructed treatment wetlands? Brix, H. Water Science and Technology 35(5), 11–17.
2000
Constructed Wetlands for Pollution Control: Processes, Performance, Design and Operation. Kadlec, R.H., Knight, R.L., Vymazal, J., Brix, H., Cooper, P. & Haberl, R. IWA Scientific and Technical Report No. 8.
2001
Are Phragmites-dominated wetlands a net source or net sink of greenhouse gases? Brix, H., Sorrell, B.K. & Lorenzen, B. Aquatic Botany 69, 313–324.
2005
The use of vertical flow constructed wetlands for on-site treatment of domestic wastewater: new Danish guidelines. Brix, H. & Arias, C.A. Ecological Engineering 25, 491–500.
2011
The flower and the butterfly constructed wetland system at Koh Phi Phi — system design and lessons learned during implementation and operation. Brix, H., Koottatep, T., Fryd, O. & Laugesen, C.H. Ecological Engineering 37(5), 729–735.
2011
Use of willows in evapotranspirative systems for onsite wastewater management — theory and experiences from Denmark. Brix, H. & Arias, C. Proceedings of the International Workshop “STREPOW”, Andrevlje–Novi Sad, Serbia, 15–29.
2014
Development of constructed wetlands in performance intensifications for wastewater treatment: a nitrogen and organic matter targeted review. Wu, S., Kuschk, P., Brix, H., Vymazal, J. & Dong, R. Water Research 57, 40–55.
2017
Sludge dewatering and mineralization in sludge treatment reed beds. Brix, H. Water 9(3), 160.

Contact

Let's talk about your wetland project

Whether it's a feasibility study, a treatment wetland or a Nature-Based Solution, you reach Hans Brix directly. Get in touch to discuss how we can help.

Email Hans
Emailhans@wems.dk
Phone

+45 28 99 20 31

Address

Glentehøj 9, 8410 Rønde, Denmark

Company

Wetland Ecology and Management Services Solutions ApS · CVR 46072464