Creating a financial return-on-investment for constructed treatment wetlands

2010 ◽  
Author(s):  
Dawn M Reinhold
Keyword(s):  
Return On Investment ◽  
Treatment Wetlands ◽  
Financial Return ◽  
Constructed Treatment Wetlands

Do macrophytes play a role in constructed treatment wetlands?

1997 ◽  
Vol 35 (5) ◽  
pp. 11-17 ◽  
Author(s):  
Hans Brix
Keyword(s):  
Surface Flow ◽  
Treatment Wetlands ◽  
Treatment Processes ◽  
Aquatic Mosses ◽  
Flow Systems ◽  
Physical Effects ◽  
Removal Processes ◽  
Constructed Treatment Wetlands ◽  
Uptake Of Nutrients

The larger aquatic plants growing in wetlands are usually called macrophytes. These include aquatic vascular plants, aquatic mosses and some larger algae. The presence or absence of aquatic macrophytes is one of the characteristics used to define wetlands, and as such macrophytes are an indispensable component of these ecosystems. As the most important removal processes in constructed treatment wetlands are based on physical and microbial processes, the role of the macrophytes in these has been questioned. This paper summarizes how macrophytes influence the treatment processes in wetlands. The most important functions of the macrophytes in relation to the treatment of wastewater are the physical effects the presence of the plants gives rise to. The macrophytes stabilise the surface of the beds, provide good conditions for physical filtration, prevent vertical flow systems from clogging, insulate the surface against frost during winter, and provide a huge surface area for attached microbial growth. Contrary to earlier belief, the growth of macrophytes does not increase the hydraulic conductivity of the substrate in soil-based subsurface flow constructed wetlands. The metabolism of the macrophytes affects the treatment processes to different extents depending on the type of the constructed wetland. Plant uptake of nutrients is only of quantitative importance in low-loaded systems (surface flow systems). Macrophyte mediated transfer of oxygen to the rhizosphere by leakage from roots increases aerobic degradation of organic matter and nitrification. The macrophytes have additional site-specific values by providing habitat for wildlife and making wastewater treatment systems aesthetically pleasing.

Hydrogen Thresholds as Indicators of Dehalorespiration in Constructed Treatment Wetlands

2004 ◽  
Vol 38 (4) ◽  
pp. 1024-1030 ◽  
Author(s):  
Gabriel Kassenga ◽  
John H. Pardue ◽  
William M. Moe ◽  
Kimberly S. Bowman
Keyword(s):  
Treatment Wetlands ◽  
Constructed Treatment Wetlands

scholarly journals Aridland constructed treatment wetlands I: Macrophyte productivity, community composition, and nitrogen uptake

2016 ◽  
Vol 97 ◽  
pp. 649-657 ◽  
Author(s):  
Nicholas A. Weller ◽  
Daniel L. Childers ◽  
Laura Turnbull ◽  
Robert F. Upham
Keyword(s):  
Community Composition ◽  
Nitrogen Uptake ◽  
Treatment Wetlands ◽  
Constructed Treatment Wetlands

Financial return-on-investment of ophthalmic interventions

2014 ◽  
Vol 25 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Melissa M. Brown ◽  
Gary C. Brown ◽  
Heidi B. Lieske ◽  
P. Alexander Lieske
Keyword(s):  
Return On Investment ◽  
Financial Return
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