Water and sediment chemistry of a wetland treating municipal wastewater
作者:
Catherine Chagué‐Goff,
MichaelR. Rosen,
Mirjam Roseleur,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1999)
卷期:
Volume 33,
issue 4
页码: 649-660
ISSN:0028-8330
年代: 1999
DOI:10.1080/00288330.1999.9516908
出版商: Taylor & Francis Group
关键词: sewage treatment wetland;nutrients;contaminant removal;zinc;New Zealand
数据来源: Taylor
摘要:
The effects of wastewater discharge in an artificially confined wetland, Turangi land treatment facility, New Zealand, were investigated by measuring the changes in water and sediment chemistry in the land treatment facility. Analysis of surface water shows that the treatment facility is effective at removing BOD5(85%), but not NH4‐N, SO4, PO4‐P, and total suspended solids. Surface flow measurements indicate that the effluent flows through the confined wetland in less than a day. The retention time is too short to allow exchange between wetland vegetation and effluent, thus preventing efficient contaminant removal. The change in land use c. 30 years ago associated with the construction of the land treatment facility is reflected in a change in stratigraphy and sediment chemistry. Elevated sulphur and zinc concentrations in sediments are attributed to sewage effluent discharge, and indicate that soil uptake is taking place.
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