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Sewage
sludge treatment by artificial wetlands
Domestic sludge is dispersed onto reed beds. The
reed plants grow through the overlying sludge and develop numerous
roots in the substrate. This leads to a forced dewatering and
mineralization of the sludge. The dewatering is driven by
evapotranspiration and particularly by a drainage system on the bottom
of the sealed reed beds (polyethylene liner).
The sludge volume declines to about 10 % of the initial volume. Usually
the reed beds work for a period of 8 to 12 years without sludge
removal. The resulting product of the dewatering is an earthy organic
material. The sludge humus can be used for further composting, for
fertilization, for thermal recycling, for recultivation, gardening and
landscaping.
Sludge
dewatering and mineralisation is achieved by applying sludge to the
surface of specially designed vertical flow systems. The reeds absorb
particularly high rates of water which they transpire into the air
through their leaves. This process, in combination with an enhanced
drainage function and the aerating action of the plants, results in an
efficient low cost dewatering of the applied sludges.
Further technology explanation:
 Reed
beds for sewage
sludge dewatering and
mineralization
Natural treatment of sewage sludge in reed
planted dewatering beds
Some of our realized projects you can find here.
For purchase of adapted reed plants (aquatic macrophytes)
look at:
www.rhizotech.de
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