JPWO2011148512A1 - 六価クロムの還元方法、成形体の製造方法及び地盤改良方法 - Google Patents
六価クロムの還元方法、成形体の製造方法及び地盤改良方法 Download PDFInfo
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- JPWO2011148512A1 JPWO2011148512A1 JP2012517078A JP2012517078A JPWO2011148512A1 JP WO2011148512 A1 JPWO2011148512 A1 JP WO2011148512A1 JP 2012517078 A JP2012517078 A JP 2012517078A JP 2012517078 A JP2012517078 A JP 2012517078A JP WO2011148512 A1 JPWO2011148512 A1 JP WO2011148512A1
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- hexavalent chromium
- cellulomonas
- reducing
- cement
- microorganism
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- 235000010378 sodium ascorbate Nutrition 0.000 description 1
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- 235000010265 sodium sulphite Nutrition 0.000 description 1
- GNBVPFITFYNRCN-UHFFFAOYSA-M sodium thioglycolate Chemical compound [Na+].[O-]C(=O)CS GNBVPFITFYNRCN-UHFFFAOYSA-M 0.000 description 1
- 229940046307 sodium thioglycolate Drugs 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
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- RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical compound [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 description 1
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- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 150000003538 tetroses Chemical class 0.000 description 1
- 229940035024 thioglycerol Drugs 0.000 description 1
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 150000003641 trioses Chemical class 0.000 description 1
- 239000012137 tryptone Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- FYGDTMLNYKFZSV-BYLHFPJWSA-N β-1,4-galactotrioside Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@H](CO)O[C@@H](O[C@@H]2[C@@H](O[C@@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-BYLHFPJWSA-N 0.000 description 1
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Abstract
Description
上記の課題を解決するために、本発明の第一の態様によれば、六価クロムを含有するとともに水溶液がアルカリ性である水硬性物質に好アルカリ性セルロモナス属微生物を接触させる六価クロムの還元方法が提供される。
上記の六価クロムの還元方法において、還元糖は、キシロース、ラクトース、及びマルトースから選ばれる少なくとも一種であることが好ましい。
上記の六価クロムの還元方法において、還元剤は、アスコルビン酸、チオグリコール酸、システイン、メルカプト化合物、亜硫酸塩、亜硫酸水素塩、及びチオ硫酸塩から選ばれる少なくとも一種であることが好ましい。
上記の六価クロムの還元方法において、水硬性物質はセメントであることが好ましい。
上記の六価クロムの還元方法において、セメントは、ポルトランドセメント、混合セメント、及び地盤改良用セメント系固化材から選ばれる少なくとも一種であることが好ましい。
本実施形態の六価クロムの還元方法は、六価クロムを含有するとともに水溶液がアルカリ性である水硬性物質(以下、単に「水硬性物質」という)に好アルカリ性セルロモナス属微生物を接触させることにより実施される。上記の還元方法は、好ましくは、さらに還元糖、還元剤、及び高炉スラグの添加を含む。
六価クロムの還元処理時における水硬性物質の含有量に対する還元糖、還元剤、又は高炉スラグの含有量の混合比は、例えば、それらの化合物の種類及び処理環境に応じて適宜設定される。
本実施形態では、水硬性物質中の六価クロムを還元するに際して、好アルカリ性セルロモナス属微生物が使用される。このことは、水溶液がアルカリ性である水硬性物質であっても、好アルカリ性セルロモナス属微生物により六価クロムを還元することができる点で有利である。
本実施形態の六価クロムの還元方法の工程において、β−1,3グルカンを生成できる微生物から抽出又は精製されたβ−1,3グルカンを配合してもよい。
(試験例1:セルロモナス属微生物K32A株についてpH依存性試験)
好アルカリ性セルロモナス属微生物としてのセルロモナス属微生物K32A株のpH依存性を試験した。比較例として中性菌であるセルロモナス・フラビゲナ(Cellulomonas flavigena)を用い、pH依存性を試験した。
好アルカリ性セルロモナス属微生物としてのセルロモナス属微生物K32A株の温度依存性を試験した。
セルロモナス属微生物K32A株の六価クロムの還元能に関するpH依存性を試験した。
セルロモナス属微生物K32A株の六価クロムの還元能に関し、還元糖が与える影響を試験した。
セルロモナス属微生物K32A株の六価クロムの還元能に関し、高炉スラグが与える影響を試験した。
セルロモナス属微生物K32A株の六価クロムの還元能に関し、還元剤が与える影響を試験した。
セルロモナス属微生物K32A株の六価クロムの還元能に関し、接種菌数が与える影響を試験した。
水硬性物質から得られる成形体について、セルロモナス属微生物K32A株の成形体の強度に与える影響を試験した。水硬性物質としてポルトランドセメント(宇部三菱セメント社製)を使用した。モルタルは、JISR5201(セメントの物理的試験方法)の試験用供試体の製造方法に従った。表13に記載される成分を混合するとともに、セルロモナス属微生物K32A株を接種菌数1×103cfu/mL、1×106cfu/mL、1×109cfu/mLとしてそれぞれ表13に記載される菌液量で混合した。尚、セルロモナス属微生物K32A株は、増殖曲線が定常期にある培養液1mLを水1Lに希釈したものを接種菌数1×109cfu/mLの菌液とした。その1×109cfu/mLの菌液をさらに1000倍希釈したものを接種菌数1×106cfu/mLの菌液とした。その1×106cfu/mLの菌液をさらに1000倍希釈したものを接種菌数1×103cfu/mLの菌液とした。供試体の作成は、JISA5308付属書のCのC.8.1.8(モルタル圧縮強度比の試験)に準じた。直径50mm×長さ100mmのモールドに充填して、脱型後供試体を恒温水槽内にて所定材齢まで養生した。JISA1108(コンクリートの圧縮強度試験方法)に従い、水中養生7日後及び28日後のコンクリートの強度試験を行った(N=3)。結果を表13に示す。
水硬性物質から得られるペースト固化物又はスラリー固化物について、六価クロムの溶出量を測定した。水硬性物質として宇部三菱セメント社製、麻生ラファージュセメント社製(ナイダスト)、及びトクヤマ社製の各ポルトランドセメントを使用した。セメント協会標準試験方法の「セメント系固化材による改良体の強度試験方法(JCAS L−01:2006)」に準拠して供試体を調製した。より具体的には、上記各ポルトランドセメント100g、水50g、及びセルロモナス属微生物K32A株を下記表14に示される配合量で混合し、ペースト物を作製した。それを固化させたのち六価クロムの溶出試験を行った。一方、上記各ポルトランドセメントとして麻生ラファージュセメント社製(ナイダスト)350g、水350g、土1850g及びセルロモナス属微生物K32A株を下記表15に示される配合量で混合し、スラリー物を作製した。それを固化させたのち六価クロムの溶出試験を行った。ペースト固化物及びスラリー固化物の養生日数は、それぞれ28日とした。
Claims (11)
- 六価クロムを含有するとともに水溶液がアルカリ性である水硬性物質に好アルカリ性セルロモナス属微生物を接触させることを特徴とする六価クロムの還元方法。
- さらに還元糖を添加することを特徴とする請求項1に記載の六価クロムの還元方法。
- 前記還元糖は、キシロース、ラクトース、及びマルトースから選ばれる少なくとも一種である特徴とする請求項2に記載の六価クロムの還元方法。
- さらに還元剤を添加することを特徴とする請求項1から請求項3のいずれか一項に記載の六価クロムの還元方法。
- 前記還元剤は、アスコルビン酸、チオグリコール酸、システイン、メルカプト化合物、亜硫酸塩、亜硫酸水素塩、及びチオ硫酸塩から選ばれる少なくとも一種である特徴とする請求項4に記載の六価クロムの還元方法。
- さらに高炉スラグを添加することを特徴とする請求項1から請求項5のいずれか一項に記載の六価クロムの還元方法。
- 前記水硬性物質はセメントであることを特徴とする請求項1から請求項6のいずれか一項に記載の六価クロムの還元方法。
- 前記セメントは、ポルトランドセメント、混合セメント、及び地盤改良用セメント系固化材から選ばれる少なくとも一種であることを特徴とする請求項7に記載の六価クロムの還元方法。
- 前記好アルカリ性セルロモナス属微生物は、セルロモナス属微生物K32A株(国際寄託機関である独立行政法人産業技術総合研究所特許生物寄託センター(旧通商産業省工業技術院生命工学工業技術研究所)に1999年6月25日に国際寄託されており、その菌受託番号はFERM BP−6766)であることを特徴とする請求項1から請求項8のいずれか一項に記載の六価クロムの還元方法。
- 六価クロムを含有するとともに水溶液がアルカリ性である水硬性物質、骨材、混和材料、好アルカリ性セルロモナス属微生物、及び水を混合することを特徴とする成形体の製造方法。
- 六価クロムを含有するとともに水溶液がアルカリ性である地盤改良用セメント系固化材及び好アルカリ性セルロモナス属微生物を、土壌に添加・混合することを特徴とする地盤改良方法。
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