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Ecological Treatment of Waste Waters Using Wetland Roofs

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Ecological Treatment of Waste Waters Using Wetland Roofs

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Samenvatting

The world’s population continues to grow and as a result we face serious issues such as climate change that should be tackled now, before we move past a point of no return. Rapid population growth in conjunction with warmer climates will affect the entire globe and is not specific to any particular country. In urbanised areas, global warming leads to a heat island effect (increasing the temperature by 2 – 8 °C), in arid and semi-arid regions water scarcity is becoming an inexorable problem.
Green roofs have long been cultivated in different cultures and climates (e.g. Norway and Iraq) to induce an insulation effect, as well as for aesthetic reasons. However, they fell into oblivion and were not really known until the 20th century. Since the mid 1990’s studies have been carried out to determine other effects of green roofs such as noise reduction, stormwater management, biodiversity increase, heat reduction in cities and carbon footprint decrease to name a few. Since early 2000, many countries around the world are adapting to the changing and warmer environment. Laws enact that new built houses have to have a green roof.
Constructed Wetland Roofs (CWRs) have the same effect as the above-mentioned benefits. Additionally, they are expected to be able to treat waste water for reuse (e.g. gardening, washing and cleaning) or to be discharged into other water bodies. The research Ecological Treatment of Waste Waters with Wetland Roofs focused on a pitched roof (4,4 m²) planted with lesser pond-sedges (Carex acutiformis) and common rushes (Juncus effuses) to treat greywater (least polluted waste water) with different hydraulic loadings.
The results are very promising. One hydraulic loading of 10 l/m².d was applied and purified by the CWR. With a higher loading treatment efficiencies of 97 % BOD, 87 % COD, 66 % TP and 90 % TN were reached and thus being under the German minimum requirement to discharge waste water into water bodies.

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OrganisatieHZ University of Applied Sciences
OpleidingWatermanagement/ Aquatische Ecotechnologie
InstituutDelta Academy
PartnersBlumberg Engineers
Gepubliceerd in
Datum2015-06-26
TypeBachelorscriptie
TaalEngels

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