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Title Transcription
ハイドロタルサイト カゴウブツ ヲ ハイゴウ シタ コンクリート ブロック ニヨル トシ カセン カラ ノ リン ジョキョ
Title Alternative
Phosphorous Removal from Urban River Using Concrete Blocks Mixed with Hydrotalcite Compounds
Author
Nonaka, Tsuguhiro
YAMAMOTO, Hiroki Faculty of Life and Environmental Science, Shimane University
Aizaki, Morihiro
FUKUDA, Yasutomo Izcon Co.
Description
Concrete blocks with phosphorous adsorption ability have been developed to remove non-point source phosphorous from rivers and canals. The concrete blocks were prepared by mixing cement with a hydrotalcite compound (HT) that has high selectivity and large phosphorous adsorption capacity. The concrete blocks (test pieces) with various the filling ratios of 85, 90 and 95% were prepared using fresh concrete, and the result of the slump test was 0 cm. Also, the compressive strength and phosphorous removal capacity were investigated fundamentally. The results showed that the compressive strength of all the test pieces was above 18N·mm-2 and they were sufficiently strong for use as laying blocks. For a test piece with a low filling ratio, phosphorous was removed by Ca2+ and for a test piece with a high filling ratio, phosphorous was not removed by ion exchange. However, these results suggest that high strength and high phosphorous adsorption ability are compatible with each other, which can be controlled by regulating the mix proportion. Furthermore, field tests were conducted using large concrete blocks containing HT (HT specimens). The results showed that phosphorous was adsorbed at the uppermost layer of the HT specimens. In the tests, the break-through of phosphorous adsorption occurred three months later and the average removal rate for such break-through was 3.69mg P·m-2·d-1.
Subject
phosphorous removal
non-point source
concrete material
phosphorous resource
hydrotalcite compounds
Journal Title
水環境学会誌
Volume
27
Issue
2
Start Page
109
End Page
115
ISSN
1881-3690
ISSN(Online)
0916-8958
Published Date
2004-02-10
DOI
Publisher
日本水環境学会
Publisher Transcription
ニホン スイカンキョウ ガッカイ
Publisher Aalternative
Japan Society on Water Environment
NII Type
Journal Article
Format
PDF
Text Version
出版社版
OAI-PMH Set
Department of Environmental and Sustainability Sciences, Faculty of Life and Environmental Science
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