The importance of wetland systems for water pollution control has been continuously rising over the past two decades. What was originally regarded as an interesting ecologically inspired experimental concept has developed to the stage that nowadays many hundreds of wetland systems have been installed all over the world as an efficient treatment technology for varied types of wastewater. In some instances their results are not as expected, showing the need for more research, and this issue of Water Science and Technology highlights new studies leading towards solutions for those problems that arise in full-scale implementation.
This issue offers a fully peer-reviewed selection of papers that review and assess research and management practices on natural and constructed wetlands, aimed at improving natural dynamic processes and pollution control. Papers cover the following topics: design criteria, operation and performance; optimization and modelling; nutrient removal; effluent reuse, pathogen removal and heavy metals; and ecological considerations. They provide scientists, engineers, managers and entrepreneurs with a timely compilation of authoritative insights into state-of-the-art research on and successful application of wetland systems around the world