Helophyte mats (wetland roofs) with high evapotranspiration rates as a tool for decentralised rainwater management – process stability improved by simultaneous greywater treatment

Redensification of the housing stock is also creating challenges for the drainage of wastewater and rainwater in existing sewer systems, particularly in growing cities. One alternative here is the evaporation of rainwater, which reduces hydraulic loads on sewers. Rainwater evapotranspiration using h...

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Bibliographic Details
Published in:Water science & technology. Water supply 2019-05, Vol.19 (3), p.808-814
Main Authors: Zehnsdorf, Andreas, Blumberg, Michael, Müller, Roland A.
Format: Article
Language:English
Subjects:
Biofilms
Chemical oxygen demand
Drainage systems
Evaporation
Evapotranspiration
Floods
Green buildings
Green roofs
Greywater
Housing
Landscape architecture
Loads (forces)
Mats
Nutrient cycles
Nutrient requirements
Precipitation
Rain
Rain water
Retention
Roofing
Roofs
Sewer systems
Sewers
Stability
Sustainable design
Textiles
Wastewater
Water reuse
Water supply
Water treatment
Wetlands
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Summary:Redensification of the housing stock is also creating challenges for the drainage of wastewater and rainwater in existing sewer systems, particularly in growing cities. One alternative here is the evaporation of rainwater, which reduces hydraulic loads on sewers. Rainwater evapotranspiration using helophyte mats on building roofs is a possible approach. Helophytes are able to transpire considerably more rainwater than extensively planted green roofs. Other than conventional green roofs helophyte mats in the form of wetland roofs require a permanent water supply on a daily basis. Greywater application can be an additional advantage in terms of nutrient supply of the wetland roof after being treated microbiologically within the plant carrier mat. The treatment of greywater using a helophyte-planted roof can help to meet the water and nutrient requirements of the helophytes even during rain-free periods. However, it must be ensured that the root mat treats the greywater to a sufficient extent. It was shown under practical conditions that a 0.1 m-thick helophyte mat is suitable for treating typical domestic greywater at loads of up to 15 L m−2 d−1.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2018.126