JP6827233B2 - 六価クロム還元剤及び六価クロムの還元処理方法 - Google Patents
六価クロム還元剤及び六価クロムの還元処理方法 Download PDFInfo
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- 239000003638 chemical reducing agent Substances 0.000 title claims description 44
- 238000000034 method Methods 0.000 title claims 5
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 38
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 33
- 239000011651 chromium Substances 0.000 claims description 24
- 241000894006 Bacteria Species 0.000 claims description 23
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 23
- 229910052804 chromium Inorganic materials 0.000 claims description 23
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- 239000004310 lactic acid Substances 0.000 claims description 19
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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 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
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- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- 240000000073 Achillea millefolium Species 0.000 description 1
- 235000007754 Achillea millefolium Nutrition 0.000 description 1
- 244000075779 Bacillus subtilis subsp natto Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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- 241000186000 Bifidobacterium Species 0.000 description 1
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Processing Of Solid Wastes (AREA)
Description
試験例1〜3は、表2に示す六価クロム還元剤について、六価クロム濃度とpHの異なる汚泥の六価クロム還元性を評価した。
試験例4〜11は、表3に示す六価クロム還元剤について、六価クロムの還元性を評価した。汚泥は汚泥D(Cr(VI)濃度:5000mg/L,pH:2)を以下の全ての試験例(試験例4〜39)について使用した。
試験例12〜18は、表4に示すように、六価クロム還元剤に使用されるアスコルビン酸の添加量を変更したものである。アスコルビン酸の添加量が少ない試験例12では、六価クロム還元性がやや劣るものとなった。アスコルビン酸の添加量が過剰な試験例16〜18では、六価クロム還元性に変化はないが、溶媒液への溶解性がやや劣るものとなった。
試験例19〜25は、表5に示すように、六価クロム還元剤に使用される硫酸鉄(I)の添加量を変更したものである。硫酸鉄(I)の添加量が少ない試験例19では、六価クロム還元性がやや劣るものとなった。硫酸鉄(I)の添加量が多い試験例23〜25では、六価クロム還元性に変化はなく、過剰な添加量であると考えられる。
試験例26〜32は、表6に示すように、六価クロム還元剤に使用されるクエン酸の添加量を変更したものである。クエン酸の添加量が少ない試験例26では、キレートの形成が十分でないため、30日後の溶出試験において三価クロムが酸化され六価クロムが増えたものと考えられる。クエン酸の添加量が多い試験例31,32では、六価クロムの還元がやや阻害される結果となった。
試験例33〜39は、表7に示すように、六価クロム還元剤に使用されるリグニン溶液の添加量を変更したものである。リグニン溶液の添加量が少ない試験例33では、キレートがリグニン溶液に吸着されないため、30日後の溶出試験において三価クロムが酸化され六価クロムが増えたものと考えられる。リグニン溶液の添加量が多い試験例37〜39では、六価クロム還元剤の粘度が上昇し、取扱性が困難なものとなった。
Claims (3)
- 酵母菌、乳酸菌及び納豆菌を含む菌叢と、糖類水溶液と、を含む培養液を含む六価クロム還元剤であって、
アスコルビン酸(アスコルビン酸塩を含む)及び/又はエリソルビン酸(エリソルビン酸塩を含む)を1〜30質量%含有し、
硫酸鉄(+I)、硝酸鉄(+I)又は塩化鉄(+I)から選択される金属塩を0.2〜20質量%含有し、
還元された三価クロムとキレート化合物を形成する、クエン酸、リンゴ酸、酒石酸又はコハク酸から選択される多価カルボン酸(多価カルボン酸塩を含む)を0.2〜10質量%含有し、
該キレート化合物を吸着し固定化するリグニンを1〜40質量%含有する、
ことを特徴とする六価クロム還元剤。 - 請求項1に記載の六価クロム還元剤を用いた六価クロムの還元処理方法であって、六価クロム汚染物のpHが1.9〜13.3であることを特徴とする六価クロムの還元処理方法。
- 請求項1に記載の六価クロム還元剤を用いた六価クロムの還元処理方法であって、六価クロム汚染物の六価クロム濃度が232〜5230mg/Lであることを特徴とする六価クロムの還元処理方法。
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