JP2019181366A - Method for treating mud generated in slurry type shield construction method - Google Patents
Method for treating mud generated in slurry type shield construction method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 89
- 238000010276 construction Methods 0.000 title claims abstract description 7
- 239000002002 slurry Substances 0.000 title abstract 4
- 238000002156 mixing Methods 0.000 claims abstract description 42
- 229920006318 anionic polymer Polymers 0.000 claims abstract description 6
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 127
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 55
- 239000011777 magnesium Substances 0.000 claims description 55
- 229910052749 magnesium Inorganic materials 0.000 claims description 55
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 48
- 239000011575 calcium Substances 0.000 claims description 48
- 229910052791 calcium Inorganic materials 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000010298 pulverizing process Methods 0.000 claims description 37
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 33
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 30
- 235000012245 magnesium oxide Nutrition 0.000 claims description 19
- 239000000292 calcium oxide Substances 0.000 claims description 18
- 235000012255 calcium oxide Nutrition 0.000 claims description 18
- 239000000395 magnesium oxide Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000007711 solidification Methods 0.000 claims description 13
- 230000008023 solidification Effects 0.000 claims description 13
- 235000006506 Brasenia schreberi Nutrition 0.000 claims description 12
- 244000267222 Brasenia schreberi Species 0.000 claims description 12
- 229910001510 metal chloride Inorganic materials 0.000 claims description 11
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 9
- 239000000347 magnesium hydroxide Substances 0.000 claims description 9
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 239000010450 olivine Substances 0.000 claims description 7
- 229910052609 olivine Inorganic materials 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
- 229940031958 magnesium carbonate hydroxide Drugs 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims 1
- 239000011044 quartzite Substances 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 12
- 239000002689 soil Substances 0.000 description 40
- 238000010828 elution Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 8
- 240000008042 Zea mays Species 0.000 description 8
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 8
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 8
- 235000005822 corn Nutrition 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 8
- 239000011737 fluorine Substances 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 7
- 239000012085 test solution Substances 0.000 description 7
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 239000010459 dolomite Substances 0.000 description 5
- 229910000514 dolomite Inorganic materials 0.000 description 5
- 235000014380 magnesium carbonate Nutrition 0.000 description 5
- 239000003440 toxic substance Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 4
- 239000012024 dehydrating agents Substances 0.000 description 4
- 239000000383 hazardous chemical Substances 0.000 description 4
- 231100000614 poison Toxicity 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 235000010724 Wisteria floribunda Nutrition 0.000 description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical class [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical class Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical class [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 102100026862 CD5 antigen-like Human genes 0.000 description 1
- 101710122347 CD5 antigen-like Proteins 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical class Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 229940103272 aluminum potassium sulfate Drugs 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- YHGPYBQVSJBGHH-UHFFFAOYSA-H iron(3+);trisulfate;pentahydrate Chemical compound O.O.O.O.O.[Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O YHGPYBQVSJBGHH-UHFFFAOYSA-H 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- BPLYVSYSBPLDOA-GYOJGHLZSA-N n-[(2r,3r)-1,3-dihydroxyoctadecan-2-yl]tetracosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCCCC(=O)N[C@H](CO)[C@H](O)CCCCCCCCCCCCCCC BPLYVSYSBPLDOA-GYOJGHLZSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
本発明は、泥水式シールド工法で発生する泥土の処理方法に関する。 The present invention relates to a method for treating mud generated in a muddy water type shield method.
泥水式シールド工法で発生する泥水は、通常、脱水剤を添加した後、脱水機を用いて脱水されて泥土(脱水ケーキ)となる。脱水によって含水比が低下した泥土は、産業廃棄物として処分される場合が多いが、近年、その処分場の確保が難しく、また、処分にかかる費用が高いことが問題となっている。
特許文献1には、泥水式シールド工法において発生した掘削土砂を有効利用できる処理方法として、泥水式シールド工法において発生した土砂を、一次処理土と、該一次処理土よりも粒度が小さい二次処理土とに分級した後、石膏を含む改質剤と前記二次処理土とを混合して混合物とし、この混合物を前記一次処理土又は前記改質剤が混合された一次処理土と混合することを特徴とする泥水式シールド工法土砂の処理方法が記載されている。
The muddy water generated by the muddy water shield method is usually dehydrated using a dehydrator after adding a dehydrating agent to become mud (dehydrated cake). Mud whose water content has been reduced by dehydration is often disposed of as industrial waste. However, in recent years, it is difficult to secure a disposal site and the cost for disposal is high.
In Patent Document 1, as a treatment method capable of effectively using the excavated sediment generated in the muddy water shield method, the soil generated in the muddy water shield method is treated with a primary treated soil and a secondary treatment having a particle size smaller than that of the primary treated soil. After classifying into soil, the modifying agent containing gypsum and the secondary treated soil are mixed to form a mixture, and this mixture is mixed with the primary treated soil or the primary treated soil mixed with the modifying agent. The muddy water type shield construction method is characterized by the method for treating soil.
一方、重金属等を含む汚染土壌を固化して、重金属等を不溶化するための固化不溶化材として、例えば、特許文献2に、金属硫酸塩および金属塩化物から選ばれる、少なくとも1種以上の水溶性塩類(A)100質量部に対し、下記(B1)〜(B3):
(B1)炭酸マグネシウムおよび/または水酸化マグネシウムを主成分とする固形物を、650〜1000℃で焼成して、酸化マグネシウムを含む焼成物を得た後、該焼成物を部分的に水和させて生成した水酸化マグネシウムを一部に含むマグネシア類、
(B2)1000℃における強熱減量率が、1.5〜12.0質量%であるマグネシア類、
(B3)カルシウムの含有率が、CaO換算で3.0質量%以下であるマグネシア類、
の条件をすべて満たすマグネシア類(B)を、5〜50質量部含むことを特徴とする重金属等処理材が記載されている。
On the other hand, as a solidified insolubilizing material for solidifying contaminated soil containing heavy metals, etc. to insolubilize heavy metals, for example, Patent Document 2 discloses at least one or more water-soluble substances selected from metal sulfates and metal chlorides. The following (B1) to (B3) with respect to 100 parts by mass of the salt (A):
(B1) After firing a solid containing magnesium carbonate and / or magnesium hydroxide as a main component at 650 to 1000 ° C. to obtain a fired product containing magnesium oxide, the fired product is partially hydrated. Magnesia partially containing magnesium hydroxide produced by
(B2) Magnesia whose ignition loss rate at 1000 ° C. is 1.5 to 12.0% by mass,
(B3) Magnesia having a calcium content of 3.0% by mass or less in terms of CaO,
The processing material, such as heavy metal, characterized by containing 5-50 mass parts of magnesias (B) which satisfy | fill all these conditions is described.
本発明の目的は、泥水式シールド工法で発生する泥土に関して、大きいコーン指数(400kN/m2以上)を有する固化体(処理済みの泥土)を形成させ、かつ、該固化体からの重金属等の有害物質の溶出量を低減させることができる泥土の処理方法を提供することである。 An object of the present invention is to form a solidified body (treated mud) having a large cone index (400 kN / m 2 or more) with respect to the mud generated by the muddy water type shield method, and to remove heavy metals, etc. from the solidified body An object of the present invention is to provide a method for treating mud that can reduce the elution amount of harmful substances.
本発明者は、上記課題を解決するために鋭意検討した結果、処理対象物である泥土に、固化不溶化材を添加して粉砕処理を行ない、得られた粉砕処理済みの泥土に、固化不溶化材を添加して混合処理を行う泥土の処理方法であって、各処理において、カチオン性高分子凝集剤及びアニオン性高分子凝集剤のいずれも添加されず、上記粉砕が、泥土の50%通過質量百分率が18mm以下、80%通過質量百分率が40mm以下になるまで行われる泥土の処理方法によれば、上記目的を達成できることを見出し、本発明を完成した。
すなわち、本発明は、以下の[1]〜[9]を提供するものである。
As a result of intensive studies to solve the above-mentioned problems, the present inventor added a solidified insolubilizing material to the mud that is the object to be treated, and then pulverized the solidified insolubilized material into the crushed mud thus obtained. In each treatment, neither a cationic polymer flocculant nor an anionic polymer flocculant is added, and the above pulverization is a 50% passing mass of the mud. It has been found that the above object can be achieved by the method for treating mud until the percentage is 18 mm or less and the 80% passing mass percentage is 40 mm or less, and the present invention has been completed.
That is, the present invention provides the following [1] to [9].
[1] 泥水式シールド工法で発生する泥土に、固化不溶化材を添加して、粉砕処理を行ない、粉砕処理済みの泥土を形成させる粉砕工程と、上記粉砕処理済みの泥土に、固化不溶化材を添加して、混合処理を行ない、混合処理済みの泥土を形成させる混合工程を含む、泥水式シールド工法で発生する泥土の処理方法であって、上記粉砕工程及び上記混合工程において、カチオン性高分子凝集剤及びアニオン性高分子凝集剤のいずれも添加されず、上記粉砕工程における粉砕が、上記粉砕処理済みの泥土の、50%通過質量百分率が18mm以下、80%通過質量百分率が40mm以下になるまで行われることを特徴とする泥水式シールド工法で発生する泥土の処理方法。 [1] A solidification and insolubilization material is added to the mud generated by the muddy water shield method, and a pulverization process is performed to form a crushed mud, and a solidification and insolubilization material is added to the crushed mud. A method for treating mud generated in a muddy water type shield method, including a mixing step of adding and mixing to form a mud that has been mixed, wherein the cationic polymer is used in the crushing step and the mixing step. Neither a flocculant nor an anionic polymer flocculant is added, and the pulverization in the pulverization step has a 50% passing mass percentage of 18 mm or less and an 80% passing mass percentage of 40 mm or less. A method for treating mud generated in a muddy water type shield method,
[2] 上記混合工程において、二軸ミキサを用いて混合処理を行う前記[1]に記載の泥水式シールド工法で発生する泥土の処理方法。
[3] 上記粉砕工程における、粉砕時間が1〜10秒間であり、上記混合工程における混合時間が0.5〜5分間である前記[1]または[2]に記載の泥水式シールド工法で発生する泥土の処理方法。
[4] 上記粉砕工程において添加する固化不溶化材の質量と、上記混合工程において添加する固化不溶化材の質量の比が、1:4〜4:1である前記[1]〜[3]のいずれかに記載の泥水式シールド工法で発生する泥土の処理方法。
[5] 上記固化不溶化材が、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の中から選ばれる少なくとも1種を含むものである前記[1]〜[4]のいずれかに記載の泥水式シールド工法で発生する泥土の処理方法。
[6] 上記固化不溶化材が、さらに、金属硫酸塩および金属塩化物の中から選ばれる少なくとも1種を含むものである前記[5]に記載の泥水式シールド工法で発生する泥土の処理方法。
[2] A method for treating mud generated in the mud shield method according to [1], wherein the mixing step is performed using a biaxial mixer in the mixing step.
[3] Generated in the muddy water shield method according to [1] or [2], wherein the pulverization time in the pulverization step is 1 to 10 seconds and the mixing time in the mixing step is 0.5 to 5 minutes. How to treat mud.
[4] Any of the above [1] to [3], wherein the ratio of the mass of the solidified insolubilized material added in the pulverizing step and the mass of the solidified insolubilized material added in the mixing step is 1: 4 to 4: 1. A method for treating mud generated by the muddy water type shield method described in the above.
[5] The muddy water shield according to any one of [1] to [4], wherein the solidified and insolubilized material includes at least one selected from a magnesium component having a solidifying action and a calcium component having a solidifying action. A method for treating mud generated by the construction method.
[6] The method for treating mud generated by the muddy water type shield method according to [5], wherein the solidified and insolubilized material further contains at least one selected from metal sulfates and metal chlorides.
[7] 上記固化不溶化材が、(A)上記マグネシウム成分を含むものとして下記(1)〜(3)の条件をすべて満たすマグネシウム含有物、(B)上記カルシウム成分を含むものとして下記(4)の条件を満たすカルシウム含有物、並びに、(C)上記マグネシウム成分と上記カルシウム成分を含むものとして下記(5)の条件を満たす、マグネシウム及びカルシウム含有物、の中から選ばれる1種以上を合計で、上記金属硫酸塩および上記金属塩化物の合計100質量部当たり、5〜100質量部の量で含む前記[6]に記載の泥水式シールド工法で発生する泥土の処理方法。
(1)炭酸マグネシウムおよび/または水酸化マグネシウムを主成分とする固形物を、650〜1000℃で焼成して得られる酸化マグネシウムを含むマグネシウム含有物、または、該マグネシウム含有物を部分的に水和させて生成した水酸化マグネシウムを一部に含むマグネシウム含有物
(2)1000℃における強熱減量率が、1.5〜12.0質量%であるマグネシウム含有物
(3)カルシウムの含有率が、CaO換算で5.0質量%以下であるマグネシウム含有物
(4)酸化カルシウムおよび/または水酸化カルシウムの含有率の合計が、CaO換算で70質量%以上であるカルシウム含有物
(5)マグネシウムの含有率が、MgO換算で5〜35質量%であり、カルシウムの含有率が、CaO換算で20〜50質量%であり、上記マグネシウムの含有率と上記カルシウムの含有率の合計が、50質量%以上であるマグネシウムとカルシウム含有物
[8] 上記固化不溶化材が、半水石膏、炭酸カルシウム含有粉末、珪石粉末、砕石微粉末、カンラン石粉末から選ばれる少なくとも1種からなる助材を含む前記[1]〜[7]のいずれかに記載の泥水式シールド工法で発生する泥土の処理方法。
[9] 上記泥水式シールド工法で発生する泥土1m3当たり、上記固化不溶化材の添加量が、20〜250kgである前記[1]〜[8]のいずれかに記載の泥水式シールド工法で発生する泥土の処理方法。
[7] The solidified and insolubilized material includes (A) a magnesium-containing material satisfying all the following conditions (1) to (3) as containing the magnesium component, and (B) the following (4) containing the calcium component. And (C) one or more selected from among magnesium and calcium-containing materials satisfying the following condition (5) as containing the magnesium component and the calcium component: The method for treating mud generated in the muddy water type shield method according to the above [6], which is contained in an amount of 5 to 100 parts by mass per 100 parts by mass in total of the metal sulfate and the metal chloride.
(1) Magnesium-containing material containing magnesium oxide obtained by firing a solid material containing magnesium carbonate and / or magnesium hydroxide as a main component at 650 to 1000 ° C., or partially hydrated the magnesium-containing material Magnesium-containing product partially containing magnesium hydroxide produced (2) The ignition loss at 1000 ° C. is 1.5 to 12.0% by mass. Magnesium-containing product (3) The content of calcium is Magnesium-containing material that is 5.0% by mass or less in terms of CaO (4) Calcium-containing material in which the total content of calcium oxide and / or calcium hydroxide is 70% by mass or more in terms of CaO (5) Magnesium content The rate is 5 to 35% by mass in terms of MgO, and the calcium content is 20 to 50% by mass in terms of CaO. Magnesium and calcium-containing material in which the total content of gnesium and calcium is 50% by mass or more [8] The solidified insolubilized material is hemihydrate gypsum, calcium carbonate-containing powder, silica stone powder, crushed stone fine powder, The processing method of the mud produced | generated by the muddy water type shield method in any one of said [1]-[7] containing the auxiliary material which consists of at least 1 sort (s) chosen from olivine powder.
[9] Mud 1 m 3 per generated by the muddy water type shield method, amount of the solidifying insolubilizing material, generated in the muddy water type shield method according to any one of the a 20~250kg [1] ~ [8] How to treat mud.
本発明によれば、泥水式シールド工法で発生する泥土に関して、大きいコーン指数(400kN/m2以上)を有する固化体(処理済みの泥土)を形成させ、かつ、該固化体からの重金属等の有害物質の溶出量を低減させることができる。
また、得られた固化体は、例えば、産業廃棄物として取り扱われず、盛土用材料や埋立用材料等として利用することができる。
According to the present invention, a solidified body (treated mud) having a large cone index (400 kN / m 2 or more) is formed with respect to the mud generated by the muddy water type shield method, and a heavy metal or the like from the solidified body is formed. The elution amount of harmful substances can be reduced.
Moreover, the obtained solidified body is not handled as industrial waste, for example, and can be used as a material for embankment or a material for landfill.
本発明の泥水式シールド工法で発生する泥土の処理方法は、泥水式シールド工法で発生する泥土に、固化不溶化材を添加して、粉砕処理を行ない、粉砕処理済みの泥土を形成させる粉砕工程と、該粉砕処理済みの泥土に、固化不溶化材を添加して、混合処理を行ない、混合処理済みの泥土を形成させる混合工程を含む泥土の処理方法であって、粉砕工程及び混合工程において、カチオン性高分子凝集剤及びアニオン性高分子凝集剤のいずれも添加されず、粉砕工程における粉砕が、粉砕処理済みの泥土の50%通過質量百分率が18mm以下、80%通過質量百分率が40mm以下になるまで行われるものである。
以下、工程毎に詳しく説明する。
A method for treating mud generated in the muddy water shield method of the present invention includes a crushing step of adding a solidified insolubilizing material to the mud generated in the muddy water shield method, and performing a pulverization treatment to form a crushed muddy soil. A method for treating mud including a mixing step of adding a solidified and insolubilizing material to the ground mud that has been ground to form a mud that has been subjected to the mixed processing. Neither the water-soluble polymer flocculant nor the anionic polymer flocculant is added, and the pulverization in the pulverization process is such that the 50% passing mass percentage of the crushed mud is 18 mm or less and the 80% passing mass percentage is 40 mm or less. Is to be done.
Hereinafter, each process will be described in detail.
[粉砕工程]
本工程は、泥水式シールド工法で発生する泥土(以下、「泥土」ともいう。)に、固化不溶化材を添加して、粉砕処理を行ない、粉砕処理済みの泥土を形成させる工程である。
泥水式シールド工法とは、シールド工法の一種であり、チャンバ内で掘削した土砂と水を混合しながら、掘進する方法をいう。
本発明の処理対象物である「泥水式シールド工法で発生する泥土」とは、泥水式シールド工法で発生する泥水(掘削した土砂と水が混合したもの)を脱水して、含水比を低下させた泥土(脱水ケーキ)である。
脱水は、通常、ベルトプレス、フィルタープレス、遠心分離脱水機、ロータリープレス、真空脱水機、スクリュープレス、多重円盤脱水機、または多重板型スクリュープレス等の一般的な脱水機を用いて行われる。
また、脱水を効率的に行う観点から、泥水に脱水剤(例えば、ポリ塩化アルミニウム、水溶性高分子等)を添加して、脱水してもよい。
[Crushing process]
This step is a step of adding a solidified insolubilizing material to the mud generated by the muddy water type shield method (hereinafter also referred to as “mud”), and performing a pulverization process to form a crushed mud.
The muddy water type shield method is a kind of shield method and refers to a method of excavating while mixing earth and sand excavated in a chamber.
The “muddy soil generated by the muddy water type shield method”, which is the object of treatment of the present invention, dewaters the muddy water generated by the muddy water type shield method (a mixture of excavated soil and water) to reduce the water content ratio. Mud (dehydrated cake).
Dehydration is usually performed using a general dehydrator such as a belt press, a filter press, a centrifugal dehydrator, a rotary press, a vacuum dehydrator, a screw press, a multi-disc dehydrator, or a multi-plate screw press.
Further, from the viewpoint of efficiently performing dehydration, a dehydrating agent (for example, polyaluminum chloride, water-soluble polymer, etc.) may be added to the muddy water for dehydration.
本発明の処理対象物である、泥水式シールド工法で発生する泥土の好ましい例としては、土壌汚染対策法(平成15年)における第二種特定有害物質の土壌溶出量基準を満たさないもの(換言すると、土壌溶出量基準として定められているカドミウム及びその化合物、六価クロム化合物、シアン化合物、水銀及びその化合物、セレン及びその化合物、鉛及びその化合物、ひ素及びその化合物、ふっ素及びその化合物、および、ほう素及びその化合物の中のいずれかについて、土壌溶出量基準(mg/L)の上限値を超えるもの;本明細書中において、これらの有害物質を「重金属等」と総称することがある。)が挙げられる。 As a preferable example of the mud generated by the muddy water type shield method, which is the object to be treated according to the present invention, one that does not satisfy the soil elution standard for the second type of specified hazardous substance in the Soil Contamination Countermeasures Law (2003) (in other words, Then, cadmium and its compound, hexavalent chromium compound, cyanide, mercury and its compound, selenium and its compound, lead and its compound, arsenic and its compound, fluorine and its compound, which are defined as soil elution amount standards, and , Boron and any of its compounds that exceed the upper limit of the soil elution standard (mg / L); in the present specification, these hazardous substances may be collectively referred to as “heavy metals, etc.” .).
本発明の処理対象物である泥土の含水比は、特に限定されないが、泥水式シールド工法における作業性や、処理対象物の含水比の調整に要する処理コストを低減する観点からは、好ましくは30%以上、より好ましくは40%以上、特に好ましくは50%以上であり、処理済みの泥土について、より大きなコーン指数を得る観点からは、好ましくは80%以下、より好ましくは70%以下、特に好ましくは60%以下である。
ここで、含水比(単位:%)とは、泥土に含まれている水の質量を、泥土の絶対乾燥状態の質量で除したものを百分率で表したもの(「水の質量」×100÷「絶対乾燥状態の質量」)をいう。
The water content ratio of the mud that is the treatment object of the present invention is not particularly limited, but from the viewpoint of reducing the workability in the muddy water type shield method and the treatment cost required for adjusting the water content ratio of the treatment object, it is preferably 30. % Or more, more preferably 40% or more, particularly preferably 50% or more. From the viewpoint of obtaining a larger corn index for the treated mud, preferably 80% or less, more preferably 70% or less, particularly preferably Is 60% or less.
Here, the water content ratio (unit:%) is a value obtained by dividing the mass of water contained in the mud by the mass of the mud in an absolute dry state (“mass of water” × 100 ÷ "Absolute dry mass").
本発明で用いる固化不溶化材の例としては、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の少なくとも1種を含むものや、金属硫酸塩や、金属塩化物等が挙げられる。
固化作用を有するマグネシウム成分を含むものの例としては、酸化マグネシウム含有物、水酸化マグネシウム含有物等が挙げられる。酸化マグネシウム含有物の例としては、軽焼マグネシアや、軽焼マグネシアの部分水和物等が挙げられる。
固化作用を有するカルシウム成分を含むものの例としては、酸化カルシウム含有物、水酸化カルシウム含有物等が挙げられる。酸化カルシウム含有物の例としては、生石灰等が挙げられる。水酸化カルシウム含有物の例としては、消石灰等が挙げられる。
固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分を含むものの例としては、軽焼ドロマイトや、軽焼ドロマイトの部分水和物等が挙げられる。
Examples of the solidified and insolubilized material used in the present invention include those containing at least one of a magnesium component having a solidifying action and a calcium component having a solidifying action, metal sulfates, metal chlorides and the like.
Examples of those containing a magnesium component having a solidifying action include magnesium oxide-containing materials and magnesium hydroxide-containing materials. Examples of the magnesium oxide-containing material include light-burned magnesia and light-burned magnesia partial hydrate.
Examples of those containing a calcium component having a solidifying action include calcium oxide-containing materials and calcium hydroxide-containing materials. Examples of the calcium oxide-containing material include quick lime. Examples of the calcium hydroxide-containing material include slaked lime.
Examples of those containing a magnesium component having a solidifying action and a calcium component having a solidifying action include light-burned dolomite and partial hydrates of light-burned dolomite.
金属硫酸塩の例としては、硫酸第一鉄、硫酸第二鉄、ポリ硫酸第二鉄等の硫酸鉄塩や、硫酸アルミニウム、硫酸アルミニウムカリウム、硫酸アルミニウムナトリウム等の硫酸アルミニウム塩等が挙げられる。なお、後述の半水石膏(助材の一例)は、ここでの金属硫酸塩の例に含まれないものとする。
金属塩化物の例としては、塩化第一鉄、塩化第二鉄等の塩化鉄塩や、ポリ塩化アルミニウム等の塩化アルミニウム塩等が挙げられる。
Examples of metal sulfates include iron sulfate salts such as ferrous sulfate, ferric sulfate, and polyferric sulfate, and aluminum sulfate salts such as aluminum sulfate, aluminum potassium sulfate, and sodium aluminum sulfate. In addition, the below-mentioned hemihydrate gypsum (an example of auxiliary material) shall not be contained in the example of a metal sulfate here.
Examples of metal chlorides include iron chloride salts such as ferrous chloride and ferric chloride, and aluminum chloride salts such as polyaluminum chloride.
上述した各種固化不溶化材は、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよく、泥水式シールド工法で発生する泥土の含水比やpH等に合わせて適宜定めればよい。
中でも、泥土の固化または重金属等の不溶化をより高める観点からは、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の中から選ばれる少なくとも1種を含む固化不溶化材が好ましく、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の中から選ばれる少なくとも1種を含み、さらに、金属硫酸塩および金属塩化物の中から選ばれる少なくとも1種を含む固化不溶化材がより好ましい。
固化不溶化材が、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の中から選ばれる少なくとも1種を含み、さらに、金属硫酸塩および金属塩化物の中から選ばれる少なくとも1種を含む場合において用いる固化不溶化材のより好ましい一例として、(A)固化作用を有するマグネシウム成分を含むものとして下記(1)〜(3)の条件をすべて満たすマグネシウム含有物、(B)固化作用を有するカルシウム成分を含むものとして下記(4)の条件を満たすカルシウム含有物、並びに、(C)固化作用を有するマグネシウム成分と固化作用を有するカルシウム成分を含むものとして下記(5)の条件を満たす、マグネシウム及びカルシウム含有物、の中から選ばれる1種以上を合計で、上述した金属硫酸塩および金属塩化物の合計100質量部当たり、5〜100質量部、好ましくは10〜80質量部、特に好ましくは20〜60質量部の量で含むものが挙げられる。
The above-mentioned various solidified and insolubilized materials may be used singly or in combination of two or more, as long as they are appropriately determined according to the water content ratio, pH, etc. of the mud generated by the muddy water type shield method. Good.
Among these, from the viewpoint of further enhancing solidification of mud or insolubilization of heavy metals, etc., a solidified insolubilized material containing at least one selected from a magnesium component having a solidifying action and a calcium component having a solidifying action is preferable, and has a solidifying action. A solidified and insolubilized material containing at least one selected from a magnesium component and a calcium component having a solidifying action, and further including at least one selected from a metal sulfate and a metal chloride is more preferable.
In the case where the solidified insolubilizing material contains at least one selected from a magnesium component having a solidifying action and a calcium component having a solidifying action, and further contains at least one selected from a metal sulfate and a metal chloride. As a more preferable example of the solidified and insolubilized material to be used, (A) a magnesium-containing material satisfying all of the following conditions (1) to (3) as containing a magnesium component having a solidifying action, and (B) a calcium component having a solidifying action. Calcium-containing material satisfying the following condition (4) as containing, and (C) containing magnesium and calcium satisfying the following condition (5) as containing a solidifying magnesium component and a solidifying calcium component A total of one or more selected from among the above-mentioned metal sulfates and Total 100 parts by weight per genus chloride, 5 to 100 parts by weight, preferably 10 to 80 parts by weight, particularly preferably those containing an amount of 20 to 60 parts by weight.
(1)炭酸マグネシウムおよび/または水酸化マグネシウムを主成分とする固形物を、650〜1000℃で焼成して得られる酸化マグネシウムを含むマグネシウム含有物、または、該マグネシウム含有物を部分的に水和させて生成した水酸化マグネシウムを一部に含むマグネシウム含有物
(2)1000℃における強熱減量率が、1.5〜12.0質量%であるマグネシウム含有物
(3)カルシウムの含有率が、CaO換算で5.0質量%以下であるマグネシウム含有物
(4)酸化カルシウムおよび/または水酸化カルシウムの含有率の合計が、CaO換算で70質量%以上であるカルシウム含有物
(5)マグネシウムの含有率が、MgO換算で5〜35質量%であり、カルシウムの含有率が、CaO換算で20〜50質量%であり、上記マグネシウムの含有率と上記カルシウムの含有率の合計が、50質量%以上であるマグネシウムとカルシウム含有物
この固化不溶化材(好ましい一例)の詳細は、特許第5757613号公報(上述の特許文献2)に記載されているとおりである。
上記(1)の条件において、「主成分」とは、好ましくは80質量%以上、より好ましくは85質量%以上、特に好ましくは90質量%以上含むことをいう。
(1) Magnesium-containing material containing magnesium oxide obtained by firing a solid material containing magnesium carbonate and / or magnesium hydroxide as a main component at 650 to 1000 ° C., or partially hydrated the magnesium-containing material Magnesium-containing product partially containing magnesium hydroxide produced (2) The ignition loss at 1000 ° C. is 1.5 to 12.0% by mass. Magnesium-containing product (3) The content of calcium is Magnesium-containing material that is 5.0% by mass or less in terms of CaO (4) Calcium-containing material in which the total content of calcium oxide and / or calcium hydroxide is 70% by mass or more in terms of CaO (5) Magnesium content The rate is 5 to 35% by mass in terms of MgO, and the calcium content is 20 to 50% by mass in terms of CaO. Magnesium and calcium-containing material in which the total content of gnesium and the calcium content is 50% by mass or more Details of this solidified insolubilized material (preferred example) are disclosed in Japanese Patent No. 5757613 (the above-mentioned Patent Document 2). As described.
In the above condition (1), the “main component” means that it is preferably 80% by mass or more, more preferably 85% by mass or more, and particularly preferably 90% by mass or more.
また、泥水式シールド工法で発生する泥土の溶出検液のpHが小さい(例えば、6.0以下、好ましくは5.0以下、より好ましくは4.0以下)場合等、処理済みの泥土の溶出検液のpHを中性領域(例えば、排出基準値である5.8〜8.6)に調整しやすくする観点からは、固化不溶化材は、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の中から選ばれる少なくとも1種を含み、かつ、金属硫酸塩および金属塩化物の中から選ばれる少なくとも1種を含まないものが好ましい。
また、固化作用を有するマグネシウム成分および固化作用を有するカルシウム成分の少なくとも1種を含み、かつ、金属硫酸塩および金属塩化物の中から選ばれる少なくとも1種を含まない固化不溶化材のより好ましい一例として、(A)固化作用を有するマグネシウム成分を含むものとして上述した(1)〜(3)の条件をすべて満たすマグネシウム含有物、(B)固化作用を有するカルシウム成分を含むものとして上述した(4)の条件を満たすカルシウム含有物、並びに、(C)固化作用を有するマグネシウム成分と固化作用を有するカルシウム成分を含むものとして上述した(5)の条件を満たす、マグネシウム及びカルシウム含有物、の中から選ばれる1種以上からなるものが挙げられる。
In addition, when the pH of the elution test solution for mud generated by the muddy water type shield method is low (for example, 6.0 or less, preferably 5.0 or less, more preferably 4.0 or less), elution of the treated mud is performed. From the viewpoint of easily adjusting the pH of the test solution to a neutral region (for example, 5.8 to 8.6 which is the discharge standard value), the solidified insolubilizing material is composed of a magnesium component having a solidifying action and calcium having a solidifying action. It preferably contains at least one selected from the components and does not contain at least one selected from metal sulfates and metal chlorides.
Further, as a more preferable example of a solidified insolubilizing material containing at least one of a magnesium component having a solidifying action and a calcium component having a solidifying action and not containing at least one selected from metal sulfates and metal chlorides. (A) Magnesium-containing material satisfying all of the conditions (1) to (3) described above as containing a magnesium component having a solidifying action, (B) (4) mentioned above as containing a calcium component having a solidifying action Selected from among the calcium-containing material satisfying the above condition and (C) the magnesium-containing and calcium-containing material satisfying the above-mentioned condition (5) as containing the solidifying calcium component and the solidifying calcium component. The thing which consists of 1 or more types selected.
固化不溶化材は、泥土の固化または重金属等の不溶化の効果をより高めることなどを目的として、各種の助材を含むことができる。
助材の例としては、半水石膏、炭酸カルシウム含有粉末、珪石粉末、砕石微粉末、カンラン石粉末等が挙げられる。これらは1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
これらの助材の例のうち、半水石膏、炭酸カルシウム含有物、珪石粉末、及び砕石微粉末の詳細は、特許第5757613号公報(上述の特許文献2)に記載されているとおりである。
カンラン石粉末としては、焼成カンラン石(例えば、カンラン石を300〜600℃で0.5〜1.5時間焼成してなるもの)の粉末および未焼成カンラン石の粉末のいずれも使用することができる。
助材の量は、助材の種類やその目的によっても異なるが、通常、上述の金属塩100質量部当たり、好ましくは500質量部以下、より好ましくは400質量部以下である。
The solidified insolubilized material can contain various auxiliary materials for the purpose of further enhancing the effect of solidifying mud or insolubilizing heavy metals.
Examples of auxiliary materials include hemihydrate gypsum, calcium carbonate-containing powder, silica stone powder, fine crushed stone powder, and olivine powder. These may be used individually by 1 type and may be used in combination of 2 or more type.
Among these auxiliary materials, details of hemihydrate gypsum, calcium carbonate-containing material, silica stone powder, and crushed stone fine powder are as described in Japanese Patent No. 5757613 (Patent Document 2 described above).
As the olivine powder, any of calcined olivine powder (for example, calcite obtained by calcining olivine at 300 to 600 ° C. for 0.5 to 1.5 hours) and uncalcined olivine powder may be used. it can.
The amount of auxiliary material varies depending on the type of auxiliary material and its purpose, but is usually preferably 500 parts by mass or less, more preferably 400 parts by mass or less, per 100 parts by mass of the above-mentioned metal salt.
粉砕工程及び混合工程(後述)において、固化不溶化材は、予め調整した固化不溶化材を泥土に添加してもよく、固化不溶化材を構成する各材料を別々に泥土に添加(例えば、マグネシウム成分と金属塩の混合物と、カルシウム成分と金属塩の混合物を別々に泥土に添加する)してもよい。 In the pulverization step and the mixing step (described later), the solidified insolubilized material may be prepared by adding a previously prepared solidified insolubilized material to the mud, and each material constituting the solidified insolubilized material is separately added to the mud (for example, a magnesium component and A mixture of metal salts and a mixture of calcium component and metal salt may be added separately to the mud).
固化不溶化材を含む泥土の粉砕のために用いられる手段の例として、多軸ハンマー式混合機、竪型三軸クラッシャー等が挙げられる。また、泥土の含水比が低い場合には自走式破砕機を用いても良い。中でも、竪型三軸クラッシャーは、短時間で粉砕可能な点で、特に好ましい。
なお、本工程における粉砕には、処理対象となる泥土に、固化不溶化材を添加して、粉砕を行う際に、必然的に発生する各材料の混合が含まれるものとする。
粉砕は、粉砕処理済みの泥土の50%通過質量百分率が18mm以下、好ましくは14mm以下、より好ましくは12mm以下、さらに好ましくは10mm以下、特に好ましく6mm以下になるまで行なわれる。該率が18mm以下であれば、固化体(処理済みの泥土)について、大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質(重金属等)の溶出量を小さくすることができる。
Examples of means used for crushing mud containing solidified and insolubilized material include a multi-shaft hammer mixer, a vertical triaxial crusher, and the like. Moreover, when the moisture content of the mud is low, a self-propelled crusher may be used. Among these, the vertical triaxial crusher is particularly preferable because it can be pulverized in a short time.
In addition, the grinding | pulverization in this process shall include mixing of each material inevitably generate | occur | produced when adding a solidification insolubilization material to the mud which becomes a process target, and grind | pulverizing.
The pulverization is performed until the 50% passing mass percentage of the crushed mud is 18 mm or less, preferably 14 mm or less, more preferably 12 mm or less, further preferably 10 mm or less, and particularly preferably 6 mm or less. If the rate is 18 mm or less, a large cone index can be obtained for the solidified body (treated mud), and the elution amount of harmful substances (heavy metal, etc.) from the solidified body (treated mud) is reduced. be able to.
また、上記粉砕は、粉砕処理済みの泥土の80%通過質量百分率が、好ましくは40mm以下、より好ましくは30mm以下、さらに好ましくは26mm以下、特に好ましく20mm以下になるまで行なわれる。該率が40mm以下であれば、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量を小さくすることができる。
なお、「50%通過質量百分率」または「80%通過質量百分率」とは、粉砕処理済みの泥土について、「JIS A 1204(2009)」(土の粒度試験方法)に準拠して粒径加積曲線を作成した場合における、該曲線から得られる「通過質量百分率が50%である上記泥土の粒径」または「通過質量百分率が80%である上記泥土の粒径」をいう。
The pulverization is performed until the 80% passing mass percentage of the crushed mud is preferably 40 mm or less, more preferably 30 mm or less, still more preferably 26 mm or less, and particularly preferably 20 mm or less. If the rate is 40 mm or less, a larger cone index can be obtained for the solidified body (treated mud), and the amount of harmful substances eluted from the solidified body (treated mud) can be reduced. .
In addition, “50% passing mass percentage” or “80% passing mass percentage” means the particle size accumulation in accordance with “JIS A 1204 (2009)” (soil particle size test method) for crushed mud. It refers to the “particle size of the mud with a passing mass percentage of 50%” or “the particle size of the mud with a passing mass percentage of 80%” obtained from the curve when a curve is created.
粉砕工程における粉砕時間(粉砕処理に要する時間)は、好ましくは1〜10秒間、より好ましくは2〜8秒間、特に好ましくは3〜5秒間である。該時間が1秒間以上であれば、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量をより小さくすることができる。該時間が10秒間以下であれば、泥土の処理にかかる時間をより短くすることができる。 The pulverization time in the pulverization step (the time required for the pulverization treatment) is preferably 1 to 10 seconds, more preferably 2 to 8 seconds, and particularly preferably 3 to 5 seconds. If the time is 1 second or longer, a larger corn index can be obtained for the solidified body (treated mud), and the amount of toxic substances eluted from the solidified body (treated mud) should be reduced. Can do. If the time is 10 seconds or less, the time required for the treatment of the mud can be further shortened.
[混合工程]
本工程は、粉砕工程の後に行われる工程であって、粉砕工程で得られた粉砕処理済みの泥土に、固化不溶化材を添加して、混合処理を行ない、混合処理済みの泥土を形成させる工程である。
固化不溶化材としては、粉砕工程で使用したものと同様のものを使用することができる。
粉砕処理済みの泥土と固化不溶化材の混合のために用いられる混合手段の例としては、バックホウ、各種のミキサ(例えば、二軸ミキサ等のパドルミキサ、強制撹拌型ミキサ、パン型ミキサ、ロータリーハンマミキサ、4軸直列混合式ミキサ等)等が挙げられる。
中でも、泥土を構成する固体の粒子に固化不溶化材がコーティングされて、該粒子を核とする造粒物が形成されることによって、混合処理済みの泥土のコーン指数をより大きくすることができる観点から、二軸ミキサが好適である。
[Mixing process]
This step is a step that is performed after the pulverization step, and is a step of adding a solidified insolubilizing material to the crushed mud obtained in the pulverization step and performing a mixing process to form a mixed mud. It is.
As the solidified and insolubilized material, the same materials as used in the pulverization step can be used.
Examples of mixing means used for mixing crushed mud and solidified insolubilized material include backhoes, various mixers (for example, paddle mixers such as biaxial mixers, forced stirring mixers, pan mixers, rotary hammer mixers) 4 axis serial mixing mixer etc.).
Among them, the solid particles constituting the mud are coated with a solidified insolubilizing material, and a granulated product having the particles as a core is formed, whereby the cone index of the mixed mud can be further increased. Therefore, a two-axis mixer is preferable.
混合は、混合処理済みの泥土の50%通過質量百分率が20mm以下、好ましくは19mm以下、より好ましくは15mm以下、さらに好ましくは12mm以下、特に好ましく8mm以下になるまで行なわれる。該率が20mm以下であれば、固化体(処理済みの泥土)について、大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質(重金属等)の溶出量を小さくすることができる。
また、上記混合は、混合処理済みの泥土の80%通過質量百分率が、好ましくは40mm以下、より好ましくは30mm以下、さらに好ましくは26mm以下、特に好ましく20mm以下になるまで行なわれる。該率が40mm以下であれば、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量を小さくすることができる。
Mixing is carried out until the 50% passing mass percentage of the mixed mud is 20 mm or less, preferably 19 mm or less, more preferably 15 mm or less, further preferably 12 mm or less, and particularly preferably 8 mm or less. If the rate is 20 mm or less, a large cone index can be obtained for the solidified body (treated mud), and the amount of toxic substances (heavy metal, etc.) eluted from the solidified body (treated mud) is reduced. be able to.
Further, the mixing is performed until the 80% passing mass percentage of the mixed mud is preferably 40 mm or less, more preferably 30 mm or less, still more preferably 26 mm or less, and particularly preferably 20 mm or less. If the rate is 40 mm or less, a larger cone index can be obtained for the solidified body (treated mud), and the amount of harmful substances eluted from the solidified body (treated mud) can be reduced. .
混合工程における混合時間は、好ましくは0.5〜5分間、より好ましくは0.75〜4分間、特に好ましくは1〜3分間である。該時間が0.5分間以上であれば、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量をより小さくすることができる。該時間が5分間以下であれば、泥土の処理にかかる時間をより短くすることができる。 The mixing time in the mixing step is preferably 0.5 to 5 minutes, more preferably 0.75 to 4 minutes, and particularly preferably 1 to 3 minutes. If this time is 0.5 minutes or more, a larger corn index can be obtained for the solidified body (treated mud), and the amount of toxic substances eluted from the solidified body (treated mud) can be reduced. can do. If this time is 5 minutes or less, the time required for the treatment of the mud can be further shortened.
本発明の処理対象物である泥土1m3当たりの固化不溶化材の添加量(粉砕工程で添加する固化不溶化材と混合工程で添加する固化不溶化材の合計量)は、好ましくは20〜250kg、より好ましくは30〜200kg、さらに好ましくは40〜170kg、特に好ましくは50〜160kgである。該添加量が20kg以上であると、重金属類等(特に、第二種特定有害物質)の溶出量をより低く抑えることができ、不溶化の効果をより高めることができる。また、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができる。該添加量が250kg以下であると、処理コストの過度な増大を避けることができる。 The amount of solidified insolubilized material added per 1 m 3 of mud that is the object of the present invention (total amount of solidified insolubilized material added in the pulverization step and solidified insolubilized material added in the mixing step) is preferably 20 to 250 kg, more Preferably it is 30-200 kg, More preferably, it is 40-170 kg, Most preferably, it is 50-160 kg. When the added amount is 20 kg or more, the elution amount of heavy metals and the like (particularly the second type specific harmful substance) can be suppressed to a lower level, and the effect of insolubilization can be further enhanced. Moreover, a larger corn index can be obtained for the solidified body (treated mud). When the addition amount is 250 kg or less, an excessive increase in processing cost can be avoided.
粉砕工程において添加する固化不溶化材の質量と、混合工程において添加する固化不溶化材の質量の比は、好ましくは1:4〜4:1、より好ましくは1:3.5〜3.5:1、特に好ましくは1:3〜3:1である。該比が上記数値範囲内であれば、固化体(処理済みの泥土)について、より大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量をより小さくすることができる。
また、固化不溶化材を二回に分けて添加する(粉砕工程および混合工程の各々において添加する)ことで、高分子凝集剤(特に、カチオン性高分子凝集剤およびアニオン性高分子凝集剤)を添加しなくとも、高分子凝集剤を添加した場合と比較して、固化体(処理済みの泥土)について、同様以上の大きなコーン指数を得ることができ、固化体(処理済みの泥土)からの有害物質の溶出量を、同等以上に小さくすることができる。
The ratio of the mass of the solidified insolubilized material added in the pulverization step to the mass of the solidified insolubilized material added in the mixing step is preferably 1: 4 to 4: 1, more preferably 1: 3.5 to 3.5: 1. Particularly preferred is 1: 3 to 3: 1. When the ratio is within the above numerical range, a larger cone index can be obtained for the solidified body (treated mud), and the amount of toxic substances eluted from the solidified body (treated mud) can be reduced. be able to.
Also, by adding the solidified insolubilizing material in two portions (added in each of the pulverization step and the mixing step), a polymer flocculant (particularly, a cationic polymer flocculant and an anionic polymer flocculant) is added. Even without addition, compared to the case where the polymer flocculant is added, a larger corn index can be obtained for the solidified body (treated mud) than the same, and from the solidified body (treated mud) The amount of toxic substance elution can be reduced to the same level or more.
本発明の泥土の処理方法で得られた処理済みの泥土は、好ましくは、土壌汚染対策法(平成15年)における第二種特定有害物質の土壌溶出量基準を満たすものである。該基準を満たす泥土は、盛土用材料や埋立用材料として好適に使用できる。
ここで、第二種特定有害物質の土壌溶出量は、平成15年3月6日環境省告示第18号「土壌溶出量調査に係る測定方法を定める件」に記載されている方法を用いて、溶出検液を作成し、「JIS K 0102(2013)」に準じて測定することができる。
また、本発明で得られた処理済みの泥土は、好ましくは、その溶出検液のpHが5.8〜8.6の範囲内となるものである。
ここで、処理済みの泥土の溶出検液のpHは、「JIS K 0102(2013) 12.1 ガラス電極法」に準拠して測定することができる。
The treated mud obtained by the method for treating mud according to the present invention preferably satisfies the soil elution amount standard of the second type specific harmful substance in the Soil Contamination Countermeasures Law (2003). Mud that satisfies this standard can be suitably used as embankment material or landfill material.
Here, the amount of soil leaching of Class II Specified Hazardous Substances was determined using the method described in the Ministry of the Environment Notification No. 18 “Matters for Measuring Soil Elution Amount” on March 6, 2003. Then, an elution test solution can be prepared and measured according to “JIS K 0102 (2013)”.
The treated mud obtained in the present invention preferably has a pH of the elution test solution in the range of 5.8 to 8.6.
Here, the pH of the treated mud elution test solution can be measured according to “JIS K 0102 (2013) 12.1 Glass Electrode Method”.
処理済みの泥土(固化体)のコーン指数は、泥土の処理の終了時から6時間経過後の時点における値として、好ましくは400kN/m2以上、より好ましくは420kN/m2以上、さらに好ましくは460kN/m2以上、特に好ましくは500kN/m2以上である。
なお、コーン指数が400kN/m2以上であれば、十分な強度を有することから、盛土用材料や埋立用材料として好適に使用できる。また、処理済みの泥土の運搬が容易となる。
ここで、コーン指数は、「JIS A 1210(2009)」(突固めによる土の締固め試験方法)に準拠して、供試体を作製した後、この供試体について、処理(混合の処理)の終了時から6時間経過後の時点で、「JIS A 1228(2009)」(締固めた土のコーン指数試験方法)に準拠して、測定することができる。
Cone index of treated mud (solidified) as the value at the time of 6 hours after the time of completion of the processing of mud, preferably 400 kN / m 2 or more, more preferably 420kN / m 2 or more, more preferably 460 kN / m 2 or more, particularly preferably 500 kN / m 2 or more.
In addition, if it is 400 kN / m < 2 > or more, since it has sufficient intensity | strength, it can be used conveniently as a material for embankment or a landfill. In addition, the treated mud can be easily transported.
Here, the cone index is determined according to “JIS A 1210 (2009)” (method of soil compaction test by tamping). At the time point after 6 hours from the end, the measurement can be performed according to “JIS A 1228 (2009)” (cone index test method for compacted soil).
以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
[使用材料]
使用材料は、以下に示すとおりである。
(a)泥土A:泥水(比重:1.12g/cm3、含水比:約400%)に、脱水剤(栗田工業社製、商品名「ソイルフレッシュP−101」)を2.5kg/m3となる量添加した後、脱水機(日本エンバイロ工業社製、フィルタープレス:型式「KPF−75PR」)を用いて、60分間脱水した、表1に示す泥土
(b)泥土B:泥水(比重:1.12g/cm3、含水比:約400%)に、脱水剤(栗田工業社製、商品名「ソイルフレッシュP−101」)を2.5kg/m3となる量添加した後、脱水機(日本エンバイロ工業社製、フィルタープレス:型式「KPF−75PR」)を用いて、60分間脱水した、表1に示す泥土
(c)固化不溶化材A〜H:表2に示す各材料からなるもの
(d)高分子凝集剤:逆相エマルション型アニオン性ポリアクリルアミド、太平洋シールドメカニクス社製、商品名「SP−α」
(e)マグネシウム含有物:マグネサイト(炭酸マグネシウムの含有率が90質量%以上のもの)を850℃で60分間、電気炉(中外エンジニアリング社製、型式「KSL−2」)を用いて焼成して軽焼マグネシアを得た後、該軽焼マグネシアをボールミルで粉砕し、ブレーン比表面積が6,300cm2/gとなるように粒度調整したもの
(f)カルシウム含有物:消石灰、奥多摩工業社製、特号
(g)マグネシウムとカルシウム含有物:ドロマイト(CaOとMgOの質量比(CaO:MgO)=1.8:1.0)を790℃で60分間、電気炉(中外エンジニアリング社製、型式「KSL−2」)を用いて焼成して軽焼ドロマイトを得た後、該軽焼ドロマイトをボールミルで粉砕し、ブレーン比表面積が5,000cm2/gとなるように粒度調整したもの
なお、上記マグネシウム含有物は、固化不溶化材の好ましい一例である上述の(1)〜(3)の条件をすべて満たすマグネシウム含有物に該当するものである。
上記カルシウム含有物は、固化不溶化材の好ましい一例である上述の(4)の条件をすべて満たすカルシウム含有物に該当するものである。
上記マグネシウムとカルシウム含有物は、固化不溶化材の好ましい一例である上述の(5)の条件をすべて満たすマグネシウムとカルシウム含有物に該当するものである。
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[Materials used]
The materials used are as shown below.
(A) Mud A: muddy water (specific gravity: 1.12 g / cm 3 , moisture content: about 400%), 2.5 kg / m of dehydrating agent (trade name “Soil Fresh P-101” manufactured by Kurita Kogyo Co., Ltd.) 3 was added, and then dehydrated for 60 minutes using a dehydrator (manufactured by Nippon Enviro Kogyo Co., Ltd., filter press: model “KPF-75PR”). Mud (b) mud B: mud (specific gravity) shown in Table 1 : 1.12 g / cm 3 , water content ratio: about 400%), after adding a dehydrating agent (trade name “Soil Fresh P-101” manufactured by Kurita Kogyo Co., Ltd.) to an amount of 2.5 kg / m 3 , followed by dehydration Using a machine (Nippon Enviro Kogyo Co., Ltd., filter press: model “KPF-75PR”), dehydrated for 60 minutes, mud soil shown in Table 1 (c) solidified insolubilized materials A to H: each material shown in Table 2 (D) Polymer flocculant: reverse phase emulsion Anionic polyacrylamide, Pacific Ocean shield mechanics Co., Ltd., trade name "SP-α"
(E) Magnesium-containing material: Magnesite (having a content of magnesium carbonate of 90% by mass or more) was fired at 850 ° C. for 60 minutes using an electric furnace (manufactured by Chugai Engineering Co., Ltd., model “KSL-2”). After the light-burned magnesia was obtained, the light-burned magnesia was pulverized with a ball mill and the particle size was adjusted so that the Blaine specific surface area was 6,300 cm 2 / g. (F) Calcium-containing material: Slaked lime, manufactured by Okutama Kogyo Co., Ltd. Special name (g) Magnesium and calcium-containing material: Dolomite (CaO: MgO mass ratio (CaO: MgO) = 1.8: 1.0) at 790 ° C. for 60 minutes, electric furnace (manufactured by Chugai Engineering Co., Ltd., model number) After calcining using “KSL-2”), lightly burned dolomite was obtained, and then the lightly burned dolomite was pulverized with a ball mill to give a specific surface area of 5,000 cm 2 / g. In addition, the said magnesium containing material corresponds to the magnesium containing material which satisfy | fills all the conditions of above-mentioned (1)-(3) which is a preferable example of a solidification insolubilization material.
The said calcium containing material corresponds to the calcium containing material which satisfy | fills all the conditions of above-mentioned (4) which is a preferable example of a solidification insolubilization material.
The said magnesium and calcium containing material corresponds to the magnesium and calcium containing material which satisfy | fills all the conditions of above-mentioned (5) which is a preferable example of a solidification insolubilization material.
以下、実施例および比較例における、泥土の処理条件1〜8(表3参照)について詳しく説明する。
[処理条件1]
多軸ハンマー式混合機(奥多摩工業社製、多軸回転ハンマー式混合機(S−4R型))に、処理対象となる泥土と固化不溶化材を入れて、表3に示す回転数で、1〜3秒間、粉砕の処理を行なった(粉砕工程)。
次いで、二軸ミキサ(冨士機社製の「FBE−1000」)に、粉砕処理済みの泥土と固化不溶化材を入れて、表3に示す回転数で、1分間、混合の処理を行ない(混合工程)、処理済みの泥土(混合処理済みの泥土)を得た。
[処理条件2〜3]
多軸ハンマー式混合機の代わりに、竪型三軸クラッシャー(冨士機社製の「マルチクラッシャー(BB−50)」を使用する以外は、処理条件1と同様にして、処理済みの泥土(混合処理済みの泥土)を得た。
[処理条件4]
処理対象となる泥土に固化不溶化材を添加した。
[処理条件5〜6]
多軸ハンマー式混合機(奥多摩工業社製、多軸回転ハンマー式混合機(S−4R型))に、処理対象となる泥土と固化不溶化材を入れて、表3に示す回転数で、1〜3秒間、粉砕の処理を行ない(粉砕工程)、処理済みの泥土(粉砕処理済みの泥土)を得た。
[処理条件7〜8]
竪型三軸クラッシャー(冨士機社製の「マルチクラッシャー(BB−50)」に、処理対象となる泥土と固化不溶化材を入れて、表3に示す回転数で、1〜3秒間、粉砕の処理を行ない(粉砕工程)、処理済みの泥土(粉砕処理済みの泥土)を得た。
Hereinafter, the mud treatment conditions 1 to 8 (see Table 3) in Examples and Comparative Examples will be described in detail.
[Processing condition 1]
In a multi-axis hammer type mixer (Okutama Kogyo Co., Ltd., multi-axis rotary hammer type mixer (S-4R type)), mud soil and solidified insolubilized material to be treated are put, and the rotational speed shown in Table 3 is 1 The grinding process was performed for ~ 3 seconds (grinding step).
Next, the crushed mud and solidified insolubilized material are put into a twin-screw mixer (Fuji-1000, manufactured by Fuji Machine Co., Ltd.), and mixed for 1 minute at the number of revolutions shown in Table 3 (mixing) Step), a treated mud (mixed mud) was obtained.
[Processing conditions 2 to 3]
Treated mud (mixed) in the same manner as in treatment condition 1 except that a vertical triaxial crusher ("Multi crusher (BB-50)" manufactured by Fuji Machine Co., Ltd.) is used instead of the multi-shaft hammer type mixer. Treated mud).
[Processing condition 4]
Solidified and insolubilized material was added to the mud to be treated.
[Processing conditions 5-6]
In a multi-axis hammer type mixer (Okutama Kogyo Co., Ltd., multi-axis rotary hammer type mixer (S-4R type)), mud soil and solidified insolubilized material to be treated are put, and the rotational speed shown in Table 3 is 1 The pulverization process was performed for ~ 3 seconds (a pulverization step) to obtain a processed mud (crushed mud).
[Processing conditions 7 to 8]
Put muddy soil and solidified insolubilized material into a vertical triaxial crusher ("Multi-crusher (BB-50)" manufactured by Fuji Machine Co., Ltd.). The treatment was performed (pulverization step) to obtain a treated mud (crushed mud).
粉砕処理後の泥土および混合処理後の泥土の各々について、「JIS A 1204(2009)」(土の粒度試験方法)に準拠して粒径加積曲線を作成し、該曲線から50%通過質量百分率および80%通過質量百分率を得た。結果を表3に示す。
なお、処理条件1〜8において、固化不溶化材A〜C、E〜Hは、各材料(金属硫酸塩、マグネシウム成分等)を事前に混合しておき、該混合物(固化不溶化材)を処理対象物に添加することによって用いた。固化不溶化材Dは、硫酸アルミニウムとマグネシウム含有物を事前に混合しておき、該混合物とポリ塩化アルミニウムをそれぞれほぼ同時に処理対象物に添加することによって用いた。
また、処理条件1〜8において、泥土Aおよび泥土Bのいずれを対象にした場合であっても、50%通過質量百分率および80%通過質量百分率の数値は同じであった。
For each of the mud after the pulverization treatment and the mud after the mixing treatment, a particle size accumulation curve is prepared in accordance with “JIS A 1204 (2009)” (soil particle size test method), and 50% passing mass is obtained from the curve. Percentage and 80% passing mass percentage were obtained. The results are shown in Table 3.
In the processing conditions 1 to 8, the solidified and insolubilized materials A to C and E to H are prepared by mixing each material (metal sulfate, magnesium component, etc.) in advance and treating the mixture (solidified insolubilized material). Used by adding to the product. The solidified insolubilizing material D was used by previously mixing aluminum sulfate and a magnesium-containing material, and adding the mixture and polyaluminum chloride to the object to be treated almost simultaneously.
Moreover, in process conditions 1-8, even if it was a case where any of the mud A and the mud B were made into the object, the numerical value of 50% passage mass percentage and 80% passage mass percentage was the same.
[実施例1〜10]
表4に示す種類の泥土(処理対象物)について、表3および表4に示す処理条件で、処理を行った。粉砕処理後の泥土および混合処理後の泥土の通過質量百分率および80%通過質量百分率は表3に示すとおりであった。
処理済みの泥土について、上述の方法を用いて、コーン指数(混合工程の終了から6時間後の値)、有害物質(ふっ素およびひ素)の土壌溶出量、および、溶出検液のpHを測定した。測定は10個の検体について行い、その平均値を測定結果とした。
なお、ふっ素の土壌汚染対策法(平成15年)における第二種特定有害物質の土壌溶出基準の値は0.8mg/リットル未満であり、ひ素の土壌汚染対策法(平成15年)における第二種特定有害物質の土壌溶出基準の値は0.01mg/リットル未満である。
[Examples 1 to 10]
About the mud of the kind shown in Table 4, it processed on the processing conditions shown in Table 3 and Table 4. The passing mass percentage and the 80% passing mass percentage of the mud after the pulverization treatment and the mud after the mixing treatment were as shown in Table 3.
For the treated mud soil, the corn index (value after 6 hours from the end of the mixing process), the amount of soil leaching of harmful substances (fluorine and arsenic), and the pH of the elution test solution were measured using the above-described method. . Measurement was performed on 10 specimens, and the average value was taken as the measurement result.
In addition, the soil elution standard value of the second kind specific harmful substance in fluorine soil pollution measures method (2003) is less than 0.8 mg / liter, and second in arsenic soil pollution measures method (2003) The soil elution standard value for species-specific hazardous substances is less than 0.01 mg / liter.
[比較例1〜8]
表4に示す種類の泥土(処理対象物)について、表3および表4に示す処理条件で、処理を行った。
なお、高分子凝集剤を添加する場合(比較例2、4〜7)、表4に示す量の高分子凝集剤を、固化不溶化材と同時にミキサに投入した。
粉砕処理後の泥土の50%通過質量百分率および80%通過質量百分率は表3に示すとおりであった。
また、処理済みの泥土のコーン指数(粉砕工程の終了から6時間後の値)、有害物質(ふっ素およびひ素)の土壌溶出量、および、溶出検液のpHを、実施例1と同様にして測定した。
結果を表4に示す。
[Comparative Examples 1-8]
About the mud of the kind shown in Table 4, it processed on the processing conditions shown in Table 3 and Table 4.
When the polymer flocculant was added (Comparative Examples 2, 4 to 7), the amount of the polymer flocculant shown in Table 4 was added to the mixer simultaneously with the solidified and insolubilized material.
Table 3 shows the 50% passing mass percentage and 80% passing mass percentage of the mud after the pulverization treatment.
In addition, the corn index of the treated mud soil (value after 6 hours from the end of the grinding process), the soil elution amount of harmful substances (fluorine and arsenic), and the pH of the elution test solution were the same as in Example 1. It was measured.
The results are shown in Table 4.
表4から、実施例1〜10では、短時間(6時間)で435kN/m2以上のコーン指数が得られているため、処理済みの泥土の取扱い(運搬等)が容易になり、かつ、処理済みの泥土の運搬等を早期に始めることができる。また、得られた処理済みの泥土は十分な強度を有しているため、盛土用材料や埋立用材料として利用できる。
また、実施例1(粉砕処理後の泥土の50%通過質量百分率:16mm)と実施例3(粉砕処理後の泥土の50%通過質量百分率:6mm)の比較から、粉砕処理後の泥土の50%通過質量百分率が小さくなると、コーン指数が大きく、かつ、ふっ素の土壌溶出量が小さくなることがわかる。
また、実施例1と比較例1の比較、実施例2と比較例3の比較、実施例10と比較例8の比較から、粉砕工程の後、混合工程を行い、かつ、固化不溶化材を各工程において添加する方法(実施例1、2、10)によれば、コーン指数が大きく、かつ、ふっ素の土壌溶出量が小さくなることがわかる。
さらに、実施例1と比較例2の比較から、実施例1では高分子凝集剤を使用していないにもかかわらず、比較例2よりも、コーン指数が大きく、かつ、ふっ素の土壌溶出量が小さいことがわかる。同様に、実施例2と比較例4の比較から、実施例2では高分子凝集剤を使用していないにもかかわらず、比較例4(高分子凝集剤を使用)よりも、コーン指数が大きく、かつ、ふっ素の土壌溶出量が小さいことがわかる。
From Table 4, in Examples 1-10, since a cone index of 435 kN / m 2 or more is obtained in a short time (6 hours), handling (transportation, etc.) of the treated mud becomes easy, and Transport of treated mud can be started early. Moreover, since the obtained processed mud has sufficient strength, it can be used as a material for embankment or a landfill.
Further, from comparison between Example 1 (50% passing mass percentage of mud after pulverization treatment: 16 mm) and Example 3 (50% passing mass percentage of mud after pulverization treatment: 6 mm), 50 of mud after pulverization treatment was obtained. It can be seen that when the% passing mass percentage is small, the cone index is large and the amount of fluorine dissolved into the soil is small.
Moreover, from the comparison between Example 1 and Comparative Example 1, the comparison between Example 2 and Comparative Example 3, and the comparison between Example 10 and Comparative Example 8, the mixing step is performed after the pulverization step, and the solidified and insolubilized material is added to each of them. According to the method added in the process (Examples 1, 2, and 10), it can be seen that the cone index is large and the amount of fluorine dissolved into the soil is small.
Further, from the comparison between Example 1 and Comparative Example 2, in Example 1, although the polymer flocculant was not used, the corn index was larger than that in Comparative Example 2, and the amount of fluorine dissolved into the soil was higher. I understand that it is small. Similarly, the comparison between Example 2 and Comparative Example 4 shows that the cone index is larger than that of Comparative Example 4 (using the polymer flocculant) although Example 2 does not use the polymer flocculant. And, it can be seen that the amount of fluorine dissolved into the soil is small.
Claims (9)
上記粉砕処理済みの泥土に、固化不溶化材を添加して、混合処理を行ない、混合処理済みの泥土を形成させる混合工程を含む、泥水式シールド工法で発生する泥土の処理方法であって、
上記粉砕工程及び上記混合工程において、カチオン性高分子凝集剤及びアニオン性高分子凝集剤のいずれも添加されず、
上記粉砕工程における粉砕が、上記粉砕処理済みの泥土の、50%通過質量百分率が18mm以下、80%通過質量百分率が40mm以下になるまで行われることを特徴とする泥水式シールド工法で発生する泥土の処理方法。 A crushing step of adding solidified insolubilizing material to the mud generated by the muddy water shield method, crushing, and forming crushed mud,
A method for treating mud generated in a muddy water type shield method, including a mixing step of adding a solidified insolubilizing material to the crushed mud and performing a mixing process to form a mixed mud,
In the pulverization step and the mixing step, neither a cationic polymer flocculant nor an anionic polymer flocculant is added,
Crushing in the crushing step is performed until the 50% passing mass percentage of the crushed mud is 18 mm or less and the 80% passing mass percentage is 40 mm or less. Processing method.
(1)炭酸マグネシウムおよび/または水酸化マグネシウムを主成分とする固形物を、650〜1000℃で焼成して得られる酸化マグネシウムを含むマグネシウム含有物、または、該マグネシウム含有物を部分的に水和させて生成した水酸化マグネシウムを一部に含むマグネシウム含有物
(2)1000℃における強熱減量率が、1.5〜12.0質量%であるマグネシウム含有物
(3)カルシウムの含有率が、CaO換算で5.0質量%以下であるマグネシウム含有物
(4)酸化カルシウムおよび/または水酸化カルシウムの含有率の合計が、CaO換算で70質量%以上であるカルシウム含有物
(5)マグネシウムの含有率が、MgO換算で5〜35質量%であり、カルシウムの含有率が、CaO換算で20〜50質量%であり、上記マグネシウムの含有率と上記カルシウムの含有率の合計が、50質量%以上であるマグネシウムとカルシウム含有物 The solidified and insolubilized material is (A) a magnesium-containing material that satisfies all the following conditions (1) to (3) as containing the magnesium component, and (B) the following (4) condition as containing the calcium component. A total of at least one selected from the group consisting of a calcium-containing material to be filled, and (C) magnesium and a calcium-containing material satisfying the following condition (5) as containing the magnesium component and the calcium component: The processing method of the mud produced | generated by the muddy water type | mold shield construction method of Claim 6 included in the quantity of 5-100 mass parts per 100 mass parts in total of a sulfate and the said metal chloride.
(1) Magnesium-containing material containing magnesium oxide obtained by firing a solid material containing magnesium carbonate and / or magnesium hydroxide as a main component at 650 to 1000 ° C., or partially hydrated the magnesium-containing material Magnesium-containing product partially containing magnesium hydroxide produced (2) The ignition loss at 1000 ° C. is 1.5 to 12.0% by mass. Magnesium-containing product (3) The content of calcium is Magnesium-containing material that is 5.0% by mass or less in terms of CaO (4) Calcium-containing material in which the total content of calcium oxide and / or calcium hydroxide is 70% by mass or more in terms of CaO (5) Magnesium content The rate is 5 to 35% by mass in terms of MgO, and the calcium content is 20 to 50% by mass in terms of CaO. The total content and the content of the calcium magnesium is magnesium is not less than 50 wt% and the calcium-containing compound
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