多孔質体を用いた藻場造成構造物および海域環境改善技術

• Material Type: 博士論文
• Title: 多孔質体を用いた藻場造成構造物および海域環境改善技術
• Author/Editor: 亀山, 剛史
• Author Heading: 亀山, 剛史
• Publication Date: 2014-03-24
• Publication Date (W3CDTF): 2014-03-24
• Degree grantor/type: 香川大学
• Date Granted: 2014-03-24
• Date Granted (W3CDTF): 2014-03-24
• Dissertation Number: 甲第92号
• Degree Type: 博士（工学）
• Conferring No. (Dissertation): 甲第92号
• Text Language Code: jpn
• Alias of Author: Kameyama, Takeshi
• Target Audience: 一般
• Note (General): 要旨我が国の沿岸域は，かつて藻場が広範囲に分布し，豊かな海域環境を形成していた．藻場は，魚類等の産卵場や稚仔魚の成育場としての役割を果たし，沿岸漁業と深い関わりがある．しかし，先の東日本大震災による海底の地盤沈下や各種沿岸開発に伴う藻場の減少は深刻化しており，藻場の修復，造成およびより高度な海域環境改善技術の開発が望まれている．香川県においても藻場は，沿岸漁業と深い関わりがあり，自治体や漁業関係者らによる藻場の現状把握のための現地調査や藻場の修復・造成研究が進められているものの，安定した海藻着生基盤や環境改善に関する技術に乏しく，未だ有効な技術開発には至っていない．本研究では前述の問題を解決するために，多孔質体を用いた新規藻場造成構造物を設計し，悪化した海底環境を改善し，生物にとって好適な環境を提供可能な環境改善基質の開発を行い，新たな海域環境改善技術を検討した; ABSTRACTThere’re many semi-enclosed bay in Seto Inland Sea, Japan and the highest fisheries productive area in the world. On the other hand, red tide and oxygen depleted water have occurred frequently and harmful affect against processes of biological production. There are many issues to be clarified about the suitable installation of artificial reefs, such as the relation between flow conditions and the biological effect of artificial reefs. Therefore we developed an artificial reef with the functions ofthe current control and the high efficiency on adhesion of prey abundance. We tried realizing the former function by the structure and the latter by the porous material. This developed artificial reef includes the porous material. The porous material usedthe air-cooled blast furnace slag. The air-cooled blast furnace slag is one of the industry by-products which produced in a manufacturing process of iron and steel. The principal of its ingredient is a CaO, SiO2, and it has the element similar to the rock. Before the installation of the structure, we conducted carbonation of porous materials in order to equalize pH with sea water (8.0-9.0). This carbonation technology can expect the reduction of CO2and recycling of the industry by-product. Also, this structure generates distinctive upwelling or downward current above the sediment, which accelerates vertical mixture of bottom layer water. Moreover, we expect probability of fouling function of algae with this current control function.We examined the effect of fouling function of algae around the structure, which was settled at the real sea bottom by measuring the concentration of algae and aggregation of fish juveniles. Verification researches in actual sea area on these functions are being performed at present and we introduce some results of these experiments.Also, many harmful substances are hidden around us. Waters and soils polluted with harmful metal ions are particularly dangerous to the living organisms. A large amount of harmful metal ions might be diffused in the water environments when the great earthquake occurred in the Eastern Japan in March 2011. The purpose in the present study is to verify the removal of various metal ions from wastewaters in the water environments by the porous concrete containing baking bone dust (mainly natural hydroxyapatite; HAP) and steel slag as a industrial by-product. The porous concrete showed more than 10N/mm2strength and30% air space rate. We investigated the removal of various metal ions from the artificial wastewater by the porous concrete. As a result, the porous concrete containing 10% baking bone dust efficiently absorbed lead ion, cadmium ion, copper ion, ferric ion and chromium ion. Manganese ion, nickel ion and strontium ion were also moderately absorbed in the porous concrete. Moreover, we examined the absorption of ferric ion and manganese ion eluted from the bottom sediment in Yashima-bay of Kagawa prefecture. The porous concrete significantly absorbed metal ions eluted from the bottomsediment. To confirm the binding ability of the porous concrete toward metal ions in real sea, the amounts of metal ions bound to the porous concrete were measured after placement of the porous concrete in Yashima-bay. As a result, 2-3years later of the placement of the porous concrete, the efficient bindings of lead ion, cadmium ion, copper ion, ferric ion, manganese ion and zinc ion to the porous concrete were observed. These results suggest that the porous concrete containing baking bone dust seem to be available to remove metal ions from the water environments. Furthermorethe useful metal ions absorbed in the porous concrete can be recovered easily with acid treatment.
• Persistent ID (NDL): info:ndljp/pid/10224377; https://dl.ndl.go.jp/pid/10224377
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2016-12-01T22:39:34+09:00
• Date Created (W3CDTF): 2020-10-27
• Format (IMT): PDF
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• Periodical Title (URI): https://kagawa-u.repo.nii.ac.jp/records/214
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp