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The Functioning of a Wetland System Used for Polishing Effluent from a Sewage Treatment Plant by Sylvia Toet; Richard S.P. Van Logtestijn; Michiel Schreijer; Ruud Kampf; Jos T.A. Verhoeven is a Environmental Science article available to read on EtoBox.

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A surface-flow wetland system designed for polishing effluent from a sewage treatment plant (STP) on the island of Texel, The Netherlands, was studied between April 1996 and March 1997. The wetland system was composed of a sequence of several units with different water depth, hydraulic retention time and vegetation. The system had a relatively short hydraulic retention time of 2.4 days (hydraulic loading rate 25 cm day -1 ). The wetland system showed 92% removal of faecal coliforms (3.7 × 10 10 cfu m -2 yr -1 ), a 26% reduction of nitrogen (126 g N m -2 yr -1 ) and less than 5% reduction of phosphorus (5 g P m -2 yr -1 ). The oxygen concentration, which was less than 3 mg l -1 in the STP effluent, showed a strong increase during passage through the wetland all year with a clear diurnal shift between 1 and 12 mg l -1 in summer. Turbidity of the surface water doubled, but the suspended solids changed from sewage sludge particles at the beginning of the system to microscopic biota characteristic for a wetland at the end. A presettling basin produced substantial reductions of faecal coliforms (11 × 10 10 cfu m -2 yr -1 ) and also intercepted incidental peaks in organic N and P load. N

Who reads The Functioning of a Wetland System Used for Polishing Effluent from a Sewage Treatment Plant?

Author

Sylvia Toet; Richard S.P. Van Logtestijn; Michiel Schreijer; Ruud Kampf; Jos T.A. Verhoeven

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0925-8574)

Published

2005

Language

EN

Field

Environmental Science (Physical Sciences)