JP6359891B2 - 土壌浄化剤及び汚染された土壌の浄化方法 - Google Patents
土壌浄化剤及び汚染された土壌の浄化方法 Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims description 128
- 238000000746 purification Methods 0.000 title claims description 62
- 239000003795 chemical substances by application Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 139
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 62
- 239000007900 aqueous suspension Substances 0.000 claims description 54
- 239000002734 clay mineral Substances 0.000 claims description 48
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- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000000725 suspension Substances 0.000 claims description 17
- 229910000278 bentonite Inorganic materials 0.000 claims description 16
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 16
- 230000008719 thickening Effects 0.000 claims description 16
- 230000000996 additive effect Effects 0.000 claims description 15
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- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 10
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- 229910052742 iron Inorganic materials 0.000 description 20
- 239000010410 layer Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 16
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
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- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 7
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- -1 1,1-dichloroethylene, 1,2-dichloroethylene, trichloroethylene, tetrachloroethylene, dichloromethane Chemical class 0.000 description 4
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- METIGIXCFPEQNM-UHFFFAOYSA-M amino-(2-bromoethyl)-dimethylazanium;bromide Chemical compound [Br-].C[N+](C)(N)CCBr METIGIXCFPEQNM-UHFFFAOYSA-M 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
前記土壌浄化剤の浸透を、前記混合物を、地盤改良用の施工機械で土壌中に供給し、前記混合物と該土壌とを撹拌することにより行う。
(a)モンモリロナイト系粘土鉱物水性懸濁液
モンモリロナイト系粘土鉱物として、クニピアF(クニミネ工業(株)製)、及びスメクトンSA(クニミネ工業(株)製)を用い、下記表1、2に示す濃度(質量%)となるように、蒸留水500ml中にマグネチックスターラーで撹拌しながら添加し、モンモリロナイト系粘土鉱物水性懸濁液を作製した。
得られた水性懸濁液の粘度を、B型粘度計(BMII、東機産業(株)製、回転数60rpm)を用いて25℃で測定した。
(a)モンモリロナイト系粘土鉱物水性懸濁液
モンモリロナイト系粘土鉱物として、クニピアF(クニミネ工業(株)製)を用い、2.5質量%のモンモリロナイト系粘土鉱物水性懸濁液を作製した。この懸濁液に、下記表3〜10の質量%となるように下記表3〜10の添加剤を添加して混合し、添加剤入りモンモリロナイト系粘土鉱物水性懸濁液を作製した。
(a)モンモリロナイト系粘土鉱物水性懸濁液
モンモリロナイト系粘土鉱物として、クニピアF(クニミネ工業(株)製)を用い、1.0質量%、1.5質量%、2.5質量%のモンモリロナイト系粘土鉱物水性懸濁液を作製した。この懸濁液に、下記表11〜13の質量%となるように塩化第一鉄を添加して混合し、添加剤入りモンモリロナイト系粘土鉱物水性懸濁液を作製し、また、この懸濁液に、下記表14〜16の質量%となるように硫酸第一鉄を添加して混合し、添加剤入りモンモリロナイト系粘土鉱物水性懸濁液を作製した。
(a)鉄粉水性懸濁液
鉄粉(商品名:鉄、粉末−150μm、99.9%;粒径:99.9%が150μm以下、和光純薬(株)製)400gに、蒸留水1Lを添加し、撹拌して、40質量%の鉄粉水性懸濁液を得た。
(2)TCE5mg/L+鉄粉50g/L(8mlのTCE50mg/Lと、10mlの鉄粉水性懸濁液を混合して、80mlにメスアップして作製)
(3)TCE5mg/L+クニピアF4.3g/L(8mlのTCE50mg/Lと、10mlのクニピアF35g/L(粘度(25℃)210mPa・s)とを混合して、80mlにメスアップして作製)
(4)TCE5mg/L+鉄粉50g/L+クニピアF4.3g/L(8mlのTCE50mg/Lと、10mlの鉄粉400g/L+クニピアF35g/L(粘度(25℃)260mPa・s)とを混合して、80mlにメスアップして作製)
(5)TCE5mg/L+鉄粉50g/L+クニピアF3.1g/L+塩化第一鉄0.038g/L(8mlのTCE50mg/Lと、10mlの鉄粉400g/L+クニピアF25g/L+塩化第一鉄0.3g/L(粘度(25℃)350mPa・s)とを混合して、80mlにメスアップして作製)
(6)TCE5mg/L+鉄粉50g/L+クニピアF3.1g/L+塩化第二鉄0.031g/L(8mlのTCE50mg/Lと、10mlの鉄粉400g/L+クニピアF25g/L+塩化第二鉄0.25g/L(粘度(25℃)300mPa・s)とを混合して、80mlにメスアップして作製)
(7)TCE5mg/L+鉄粉50g/L+クニピアF3.1g/L+硫酸第一鉄0.0625g/L(8mlのTCE50mg/Lと、10mlの鉄粉400g/L+クニピアF25g/L+硫酸第一鉄0.5g/L(粘度(25℃)290mPa・s)とを混合して、80mlにメスアップして作製
(8)TCE5mg/L+鉄粉50g/L+クニピアF3.1g/L+硫酸第二鉄0.0625g/L(8mlのTCE50mg/Lと、10mlの鉄粉400g/L+クニピアF25g/L+硫酸第二鉄0.5g/Lを混合して(粘度(25℃)275mPa・s)、80mlにメスアップして作製)
2 粘土層(不透水層)
3 土壌浄化剤
4 注入孔
Claims (13)
- 汚染された土壌を浄化するための土壌浄化剤であって、鉄粉、又は分散状態の鉄粉を含む鉄粉水性懸濁液と、増粘剤としてのモンモリロナイト系粘土鉱物が水中に分散されてなるモンモリロナイト系粘土鉱物水性懸濁液とを含み、
モンモリロナイト系粘土鉱物水性懸濁液が、さらに当該懸濁液を増粘させることができる添加剤を含み、
添加剤が、FeCl 2 、FeCl 3 、FeSO 4 、及びFe 2 (SO 4 ) 3 から選択される少なくとも1種の鉄化合物である土壌浄化剤。 - モンモリロナイト系粘土鉱物が、ベントナイト又は合成スメクタイトである請求項1に記載の土壌浄化剤。
- 鉄粉の平均粒径が10〜200μmである請求項1又は2に記載の土壌浄化剤。
- モンモリロナイト系粘土鉱物水性懸濁液の粘度が25℃で200〜400mPa・sである請求項1〜3のいずれか1項に土壌浄化剤。
- 前記汚染された土壌の汚染物質が、有機ハロゲン化物及び/又は6価クロムである請求項1〜4のいずれかに記載の土壌浄化剤。
- 前記汚染された土壌の汚染物質が、有機ハロゲン化物である請求項1〜5のいずれかに記載の土壌浄化剤。
- 請求項1〜6のいずれかに記載の土壌浄化剤に記載された、鉄粉又は鉄粉水性懸濁液とモンモリロナイト系粘土鉱物水性懸濁液との混合物からなる土壌浄化剤。
- 鉄粉の含有量が10〜50質量%であり、モンモリロナイト系粘土鉱物の含有量が0.3〜5質量%である請求項7に記載の土壌浄化剤。
- 粘度が25℃で200〜400mPa・sである請求項7又は8に土壌浄化剤。
- 請求項1〜6のいずれかに記載の土壌浄化剤に記載された、鉄粉又は鉄粉水性懸濁液とモンモリロナイト系粘土鉱物水性懸濁液とを混合し、該混合物を汚染された土壌に浸透させることからなる土壌浄化方法。
- 前記土壌浄化剤の浸透を、土壌浄化剤を土壌表面の略全面に散布することにより行う請求項10に記載の土壌浄化方法。
- 前記土壌浄化剤の浸透を、前記混合物を供給するための注入管を挿入し、該混合物をその注入管に注入することにより行う請求項10に記載の土壌浄化方法。
- 前記土壌浄化剤の浸透を、前記混合物を、地盤改良用の施工機械で土壌中に供給し、前記混合物と該土壌とを撹拌することにより行う請求項10に記載の土壌浄化方法。
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