JP2005133309A - Waters environmental recovery material for tidal marsh and shallow place - Google Patents
Waters environmental recovery material for tidal marsh and shallow placeInfo
- Publication number
- JP2005133309A JP2005133309A JP2003367263A JP2003367263A JP2005133309A JP 2005133309 A JP2005133309 A JP 2005133309A JP 2003367263 A JP2003367263 A JP 2003367263A JP 2003367263 A JP2003367263 A JP 2003367263A JP 2005133309 A JP2005133309 A JP 2005133309A
- Authority
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- Prior art keywords
- slag
- steel slag
- waters
- particle size
- blast furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 17
- 230000007613 environmental effect Effects 0.000 title abstract description 5
- 239000003643 water by type Substances 0.000 title abstract 4
- 238000011084 recovery Methods 0.000 title abstract 2
- 239000002893 slag Substances 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims description 25
- 239000002689 soil Substances 0.000 claims description 15
- 241001474374 Blennius Species 0.000 claims description 6
- 239000013049 sediment Substances 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 230000001580 bacterial effect Effects 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 238000007596 consolidation process Methods 0.000 abstract description 3
- 239000004576 sand Substances 0.000 description 15
- 238000000746 purification Methods 0.000 description 10
- 239000013535 sea water Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 235000015097 nutrients Nutrition 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000251511 Holothuroidea Species 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- -1 silicate ions Chemical class 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002062 proliferating effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
Description
土木港湾工事分野において発生する浚渫土砂を有効利用できる水域環境修復材料に関し、詳しくは浚渫土砂と鉄鋼スラグとを混合してなる生物生産性に優れ、水域の浄化機能の高い干潟、浅場造成材料に関する発明である。 In relation to water environment restoration materials that can effectively use dredged sand generated in the civil engineering and port construction field, in particular, it relates to tidal flats and shallow ground materials that are excellent in biological productivity by mixing dredged soil and steel slag, and have high water purification functions. It is an invention.
水中環境改善のための技術として、特許文献１に開示されている人工干潟用混合土壌がある。これは粒径の異なる２種の浚渫土砂を混合して、水質浄化に必要な透水性、細菌現存量を確保するものである。この場合、透水性、細菌現存量を両立させるための最適混合範囲が狭いという問題があった。 As a technique for improving the underwater environment, there is a mixed soil for artificial tidal flats disclosed in Patent Document 1. This is a mixture of two types of dredged sand with different particle sizes to ensure the water permeability and existing bacterial mass necessary for water purification. In this case, there has been a problem that the optimum mixing range for achieving both water permeability and bacterial existing amount is narrow.
また、特許文献２に開示されている水中の環境改善方法がある。この発明は、海藻生育環境の衰退・消失が懸念されている海域に、高炉水砕スラグを設置することにより、スラグからの珪酸イオン放出で藻類を増殖させ環境を改善するものである。この場合、スラグ設置の際、および設置直後に、周辺水域のｐＨ上昇を招いてしまう。また、高炉水砕スラグが固結性を有するため、底生生物の棲息環境を破壊する懸念もあった。
前述のように、浚渫土砂のみを使用する場合は、ほぼ砂質土のみを使用すると粒径が大きいため、透水性は極めて良好であるが単位土量あたりの細菌の現存量が少なくなり、海水の浄化量が減少する。また逆に、ほぼシルト・粘性土のみを使用した場合においても、細菌現存量は高くなるが透水性が低く、海水の浄化量が減少してしまうという問題がある。そこで、浚渫土砂のみを使用する場合には、水質浄化の確保のため、空隙と細菌現存量を両立するように土砂の粒度調整が必要であった。また、高炉水砕スラグのみを使用する場合は、周辺水域のｐＨ上昇が避けられず、また固結することによって底生生物の棲息に対する悪影響も伴っていた。 As described above, when only dredged soil is used, if only sandy soil is used, the particle size is large, so the water permeability is very good, but the existing amount of bacteria per unit soil volume is reduced. The amount of purification decreases. On the other hand, even when only silt / cohesive soil is used, there is a problem that the bacterial existing amount is high but the water permeability is low and the purification amount of seawater is reduced. Therefore, when only dredged soil was used, it was necessary to adjust the particle size of the sediment so that both the voids and the existing amount of bacteria were compatible in order to ensure water purification. In addition, when only blast furnace granulated slag is used, an increase in pH in the surrounding water area is unavoidable, and there is an adverse effect on the habitat of benthic organisms due to consolidation.
本発明の課題は、このような問題を回避できる干潟、浅場用水域環境修復材料を提供することにある。 An object of the present invention is to provide a tidal flat and shallow water environment restoration material that can avoid such problems.
本発明は浚渫土砂と鉄鋼スラグとを混合することによって、従来の技術における問題点を解消すると共に、これまでに想定されていない効果を享受するものである。即ち、浚渫土砂と鉄鋼スラグとを混合することにより、
（Ａ）土砂による鉄鋼スラグの物理的封じ込めにより、適用海域の海水のｐＨ上昇が抑制できること
（Ｂ）土砂粒子表面におけるイオン交換反応により、鉄鋼スラグから溶け出したＣａ＋２が土砂粒子表面に吸着され、代わりにＭｇ＋２が海水中に遊離し、更にその遊離したＭｇ＋２がＭｇ（ＯＨ）２として沈殿することにより、土砂粒子間隙水のイオン濃度が低下する。その結果、更に鉄鋼スラグからＣａイオン、珪酸塩イオン、Ｆｅ、Ｐ等が溶出することとなり、土砂粒子近傍の海水中のミネラルが豊富になること
（Ｃ）上記の（Ａ）、（Ｂ）の結果として、細菌増殖と透水性を確保するために従来必要とされていた粒度を実現するための土砂粒子の粒度調整なしでも、即ち従来最適と考えられていた粒度よりも粗い粒度であっても水質浄化に寄与する細菌現存量が上昇すること
を新規に知見したことを踏まえ、本発明の要旨は、
（１）浚渫土砂と鉄鋼スラグとからなり、非固結性であることを特徴とする干潟、浅場用水域環境修復材料。
（２）鉄鋼スラグの中央粒径が５０μｍ以上であることを特徴とする（１）に記載の干潟、浅場用水域環境修復材料。
（３）水生植物または海藻類の種子が混合されていること特徴とする（１）または（２）に記載の干潟、浅場用水域環境修復材料。
にある。
The present invention eliminates problems in the prior art by mixing dredged sand and steel slag, and enjoys effects that have not been envisaged so far. That is, by mixing dredged soil and steel slag,
(A) The increase in the pH of seawater in the applicable sea area can be suppressed by the physical containment of steel slag with earth and sand. (B) The Ca +2 dissolved from the steel slag is adsorbed on the earth and sand particle surface by the ion exchange reaction on the earth and sand particle surface. Instead, Mg +2 is liberated in seawater, and the liberated Mg +2 is precipitated as Mg (OH) 2 , so that the ionic concentration of the sediment particle interstitial water decreases. As a result, Ca ions, silicate ions, Fe, P, etc. will be further eluted from the steel slag, and the minerals in the seawater near the sediment particles will be abundant. (C) In (A) and (B) above As a result, even without adjusting the particle size of the earth and sand particles to achieve the particle size that was conventionally required to ensure bacterial growth and water permeability, that is, a particle size coarser than the particle size that was previously considered optimal Based on the new finding that the bacterial existing amount that contributes to water purification increases, the gist of the present invention is:
(1) A tidal flat and shallow water environment restoration material, characterized by non-consolidating properties, consisting of dredged sand and steel slag.
(2) The tidal flat and shallow water environment restoration material according to (1), wherein the steel slag has a median particle size of 50 μm or more.
(3) The tidal flat and shallow water environment restoration material according to (1) or (2), wherein aquatic plants or seaweed seeds are mixed.
It is in.
本発明の水域環境修復材料は、浚渫土砂と鉄鋼スラグとを混合したものであり、細菌増殖環境として優れ、土砂粒子の粒径が大きい場合でも、水質浄化作用が得られる。また鉄鋼スラグ単独では問題となる海水のｐＨ上昇も、鉄鋼スラグが浚渫土砂と混合されることにより回避可能となる。更に、鉄鋼スラグの粒度として中央粒径５０μｍ以上のものを用いることによって非固結性を確保することができる。 The water environment restoration material of the present invention is a mixture of dredged sand and steel slag, and is excellent as a bacterial growth environment, and even if the particle size of the earth and sand particles is large, a water purification effect can be obtained. Moreover, the increase in the pH of seawater, which is a problem with steel slag alone, can be avoided by mixing steel slag with dredged soil. Furthermore, non-consolidating property can be ensured by using steel slag having a median particle size of 50 μm or more.
本発明は干潟、浅場用水域環境修復材料を提供するものであるが、そもそも干潟、浅場の環境の重要性は、地球生態系の中でも熱帯雨林に匹敵するほどの高い生物生産性にある。これは、河川の流入による陸からの豊富な栄養塩供給や、浅いために光や酸素が豊富となる環境であることから、一次生産者およびそれを餌とする動物が増えることによる。これに加え、さらに近年では、海域からの窒素、リン等の無機栄養塩類を除去する浄化機能が注目されており、その主役は、無機栄養塩類を取り込み有機物を生産する底生微細藻類である。底生微細藻類によって生産された有機物は、底生生物、魚や鳥といった高次生産者、さらには人によって摂取されるとともに、これらの糞や死骸はバクテリアによって分解されるため、有機物や無機栄養塩類が海域に放出される前に干潟や浅場で消費されている。またアマモなどの海草も海域浄化に貢献していることが知られている。
本発明者らは、本発明の技術を用いることにより、干潟や浅場の生物生産性が向上し、高い水域浄化機能を引き出すことを新規に知見した。
The present invention provides a tidal flat and shallow water environment remediation material, but the importance of the tidal flat and shallow ground environment is high biological productivity comparable to that of a rainforest in the global ecosystem. This is due to the increased supply of nutrients from the land due to the inflow of rivers and the environment that is rich in light and oxygen due to its shallowness, so the number of primary producers and animals that feed on them increases. In addition, in recent years, a purification function that removes inorganic nutrients such as nitrogen and phosphorus from the sea area has attracted attention, and the main role is benthic microalgae that take in inorganic nutrients and produce organic matter. Organic matter produced by benthic microalgae is ingested by benthic organisms, higher producers such as fish and birds, and humans, and these feces and carcasses are decomposed by bacteria, so organic matter and inorganic nutrients Is consumed in tidal flats and shallow areas before being released into the sea. Seaweeds such as sea cucumber are also known to contribute to sea area purification.
The present inventors have newly found that by using the technology of the present invention, biological productivity in tidal flats and shallow areas is improved and a high water purification function is derived.
まず本発明の干潟、浅場用水域環境修復材料は、浚渫土砂と鉄鋼スラグとを混合して得られるものである。
浚渫土砂とは、船の航路の確保などを行うために取り除いた川底や海底の土砂である。川底と海底のどちらの土砂でも利用することが可能であるが、土砂粒子表面にＭｇ＋２イオンが豊富に吸着されており、イオン交換反応により鉄鋼スラグによる周辺海域のｐＨ上昇を防止する効果が高い海底の土砂を利用することが好ましい。なお、土砂の粒径は、中央粒径で５ｍｍ以下であることが好ましい。中央粒径を５ｍｍ以下とした理由は、５ｍｍ以上である場合には鉄鋼スラグを物理的に封じ込める効果が減少し、浚渫土砂に対する鉄鋼スラグの混合比率が小さい場合でも周辺水域のｐＨが急激に上昇するためである。
First, the tidal flat and shallow water environment restoration material of the present invention is obtained by mixing dredged soil and steel slag.
Dredged soil is sediment from the riverbed or seabed that has been removed to secure the ship's route. It can be used for both river and seabed sediments, but Mg +2 ions are abundantly adsorbed on the surface of the sediment particles, and the effect of preventing the pH increase in the surrounding sea area due to steel slag is high due to ion exchange reaction. It is preferable to use seabed sediment. In addition, it is preferable that the particle size of earth and sand is 5 mm or less by a median particle size. The reason why the median particle size is 5 mm or less is that when it is 5 mm or more, the effect of physically containing steel slag is reduced, and even when the mixing ratio of steel slag to dredged sand is small, the pH of the surrounding water area rapidly increases. It is to do.
また、鉄鋼スラグとしては、高炉水砕スラグ、高炉徐冷スラグ、製鋼スラグなどを用いることが出来る。
高炉水砕スラグおよび高炉徐冷スラグとは、銑鉄を製造する高炉で溶融された鉄鉱石のうち、鉄以外の成分を副原料の石灰石やコークス中の灰分と一緒に分離回収した高炉スラグであり、溶融状態のスラグを高圧水で急冷して急激な冷却によってガラス質（非晶質）の粒状スラグとしたものが高炉水砕スラグ、そして、溶融した状態のスラグをヤードで徐々に冷却したものが高炉徐冷スラグである。なお、高炉水砕スラグはさらに、高炉において冷却される炉前水砕スラグと高炉から離れた場所に移動した後に冷却する炉外水砕スラグに分けられる。
Moreover, as steel slag, blast furnace granulated slag, blast furnace slow cooling slag, steelmaking slag, etc. can be used.
Blast-furnace granulated slag and blast furnace slow-cooled slag are blast furnace slag obtained by separating and recovering components other than iron from limestone as a secondary raw material and ash in coke, among the iron ore melted in the blast furnace that produces pig iron. The molten slag is rapidly cooled with high-pressure water and converted into vitreous (amorphous) granular slag by rapid cooling. Granulated blast furnace slag, and the molten slag is gradually cooled in the yard. Is blast furnace slow cooling slag. The blast furnace granulated slag is further divided into a pre-reactor granulated slag that is cooled in the blast furnace and an out-of-furnace granulated slag that is cooled after moving to a place away from the blast furnace.
また、製鋼スラグとは、高炉で製造された硬くて脆い銑鉄から、不要な成分を除去し、靭性・加工性のある鋼にする製鋼過程で生じる石灰分を主体とした石状の副産物であり、転炉スラグ、溶銑予備処理スラグおよび電気炉スラグを用いることができる。
浚渫土砂と鉄鋼スラグとを混合した場合、条件により固結性が発現されるが本発明では非固結性を確保するよう留意する必要がある。この固結性に関しては、鉄鋼スラグの粒度を細かくし、例えば特許文献３に示されているように、高炉水砕スラグ微粉末（約４０００ブレーン）を用いると固結性が発現することが知られている。そこで本発明では、鉄鋼スラグの微粉末を用いず、中央粒径が５０μｍ以上の鉄鋼スラグを用いることにより、非固結性を確保する。なお、高炉水砕スラグ微粉末とは、炉前水砕スラグをさらに粉砕加工したものであり、アルカリ刺激の下では硬化するという潜在水硬性を有している。また、中央粒径（Ｄ５０）とは、与えられた試料全体の質量の５０％のものが通過するような篩い目の大きさのことである。Ｄ５０が大きな試料は全体的に粗粒で、Ｄ５０が小さな試料は細粒となる。
また、海草類の早期成長を確実にするため、浚渫土砂と鉄鋼スラグとを混合したものに、更に水生植物または海草類の種子を混合することも本発明の実施の態様の１つである。
Steelmaking slag is a stone-like by-product mainly composed of lime generated in the steelmaking process by removing unnecessary components from hard and brittle pig iron produced in a blast furnace to make tough and workable steel. Converter slag, hot metal pretreatment slag, and electric furnace slag can be used.
When dredged sand and steel slag are mixed, the caking property is expressed depending on the conditions, but in the present invention, it is necessary to pay attention to ensure the non-caking property. With regard to this caking property, it is known that the caking property is manifested when the particle size of steel slag is made finer and, for example, as shown in Patent Document 3, blast furnace granulated slag fine powder (about 4000 branes) is used. It has been. Therefore, in the present invention, non-consolidability is ensured by using steel slag having a median particle size of 50 μm or more without using fine powder of steel slag. The ground granulated blast furnace slag is obtained by further pulverizing the pre-furnace granulated slag and has a latent hydraulic property of being cured under alkali stimulation. The median particle size (D50) is the size of the sieve mesh through which 50% of the mass of a given sample passes. A sample having a large D50 is generally coarse and a sample having a small D50 is fine.
Further, in order to ensure the early growth of seaweeds, it is also one embodiment of the present invention to further mix aquatic plants or seaweed seeds with a mixture of dredged soil and steel slag.
以下に実施例について、詳細に説明する。
（実施例）
水域環境修復材料として浚渫土砂のみ、鉄鋼スラグのみ、および両者の混合物の３種類について、それぞれの環境修復能力を評価する実験を行った。実験方法は、まず１ｍ四方の容器に表１に示す５種類の材料を厚さ３０ｃｍで敷設し、その上に海水を３０ｃｍ深さとなるように注水した。尚、浚渫土砂は採取後に天日で乾燥させ、強熱減量が１．５％のものを使用し、鉄鋼スラグとしては中央粒径３ｍｍの製鋼スラグを用いた。また両者の混合割合は質量比でスラグ３：砂７とした。環境修復能力の評価期間中、新鮮な海水を２００ｃｃ／ｓｅｃで注入し、循環させた。また、実験開始から１カ月経過後にアマモの種子を１００粒ずつ散布した。
試験開始後６カ月、１２カ月における環境修復能力の評価結果を表１に示す。
浚渫土砂のみ、鉄鋼スラグのみの比較例に対し、本発明の２例ではいずれもマクロベントスの発生までには至らなかったが、メイオベントスの量で明確に差が見られ、高い生物生産性が確認できた。また、スラグのみの場合に、底質の深度３ｃｍ以上に軽い固結が見られたことから、マクロベントスの棲息は困難であろうと考えられる。
Examples will be described in detail below.
(Example)
Experiments were conducted to evaluate the environmental remediation ability of dredged soil only, steel slag only, and a mixture of both as water environment remediation materials. In the experimental method, first, five kinds of materials shown in Table 1 were laid in a 30-cm-thickness in a 1-m square container, and seawater was poured onto the container so as to have a depth of 30 cm. In addition, dredged soil was dried in the sun after collection, and the one with a loss on ignition of 1.5% was used, and steelmaking slag having a median particle diameter of 3 mm was used as the steel slag. Moreover, the mixing ratio of both was set to slag 3: sand 7 by mass ratio. During the evaluation period of the environmental restoration ability, fresh seawater was injected at 200 cc / sec and circulated. Moreover, 100 seeds of sea cucumber were sprayed one by one after the lapse of one month from the start of the experiment.
Table 1 shows the evaluation results of the environmental repair ability at 6 months and 12 months after the start of the test.
In contrast to the comparative example of only dredged sand and steel slag, the two examples of the present invention did not reach the occurrence of macrobenthos, but there was a clear difference in the amount of Meioventus, confirming high biological productivity. did it. In addition, in the case of slag only, since light consolidation was observed at a depth of 3 cm or more in the bottom sediment, it is considered that macrobenthos is difficult to inhabit.
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| JP2009039098A (en) * | 2007-07-13 | 2009-02-26 | Nippo Kagaku Kk | Material for improving environment, material for recovering environment in coast area, artificial tideland, method for reclaiming artificial tideland, material for improving soil layer, soil for field crop cultivation, method for reclaiming soil for field crop cultivation and method for producing field crop |
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| JP2010110255A (en) * | 2008-11-06 | 2010-05-20 | Eco Green:Kk | Structure of artificial seaweed bed, and construction method for creating artificial seaweed bed |
| WO2010116602A1 (en) * | 2009-03-30 | 2010-10-14 | 新日本製鐵株式会社 | Method for backfilling subaqueous borrow pit |
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