{"created":"2023-05-15T12:05:02.800018+00:00","id":9656,"links":{},"metadata":{"_buckets":{"deposit":"98b6ecb2-f5d4-47a1-b55b-16046472c816"},"_deposit":{"created_by":3,"id":"9656","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"9656"},"status":"published"},"_oai":{"id":"oai:iwate-u.repo.nii.ac.jp:00009656","sets":["1515:1516"]},"author_link":["73961","73962"],"item_28_alternative_title_23":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Effect of nitrogen fixing bacteria on the bacterial leaching of chalcopyrite by Thiobacillus ferrooxidans"}]},"item_28_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1996-03-01","bibliographicIssueDateType":"Issued"},"bibliographic_titles":[{}]}]},"item_28_date_6":{"attribute_name":"登録日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2012-01-30"}]},"item_28_description_11":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"科学研究費補助金[一般根研究C](課題番号06651090)研究成果報告書","subitem_description_type":"Abstract"}]},"item_28_description_12":{"attribute_name":"Abstract","attribute_value_mlt":[{"subitem_description":"鉄酸化細菌(Thiobacillus ferrooxidans)を用いた黄銅鉱のバクテリアリーチングが検討され、初期段階において浸出速度は速いが徐々に低下し、銅が十分溶出しないことが報告されている。この原因として、鉱物の酸化に伴う鉱物表面での硫黄の蓄積やジャロサイトの生成等のほかに、T.ferrooxidansの代謝産物(排出物)の蓄積による増殖阻害が考えられている。自然界においては、他の微生物の代謝産物を栄養源として有効に利用できる微生物が生息し、微生物間に共生関係が成り立っている場合が多い。本研究では、酸性領域で生育する窒素固定菌によT.ferrooxidansの代謝産物の分解・消化させ、黄銅鉱のバクテリアリ-チングの促進を試みたものである。また、活性炭は有機イオンを吸着することが知られており、T.ferrooxidansの代謝産物を吸着除去するため、活性炭を添加した場合のバクテリアリ-チングについても検討した。\n\n1.バクテリアリ-チングは主にpH2付近で行われており、まず窒素固定菌Beijerinckia indica (ATCC9540)の生育におよぼすpHの影響について検討を行った。窒素固定菌はpH3.0で増殖したが、pH3以下では十分増殖しなかった。そのため、初期pHを3.0にして1カ月培養した後、pHを0.1づつ下げた培地にB.indicaを植え継ぐ操作を繰り返すことにより耐酸性を高めることを試みたが、その効果は認められなかった。初期pH3.0で、T.ferrooxidansとB.indicaの混合菌でバクテリアリ-チングを行ったが、黄銅鉱の浸出は促進されなかった。\n\n2.活性炭を添加により、Cuの溶出が著しく促進した。たとえば、活性炭を添加しない場合、バクテリアリ-チング35日後のCu浸出率は10%で、活性炭を1g添加した場合は55%であった。(黄銅鉱添加量は4g/200ml培地である。)。また、活性炭が微粒のほど、高いCu浸出率が得られた。活性炭を添加して行うバクテリアリ-チングの最適pHは1.0であり、Fe^<2+>の酸化が始まると共にCuの溶出が著しく増加した。活性炭がCuの浸出を促進する機構はついて今後検討が必要である。","subitem_description_type":"Other"},{"subitem_description":"Thiobacillus ferrooxidans is commonly used inthe study on the bacterial leaching of chalcopyrite. It was reported that extracellular substances from T.ferrooxidans during the bacterial leaching could affect the copper extraction from chalcopyrite. In the ecological system, some bacteria decompose or digest extracelular substances form other bacteria. In this study, I chose a acidophilic, nitrogen fixing organism Beijerinckia indica to decompose extracellular substances from T.ferrooxidans, and investigated the effect of its coexistence on the bacterial leaching of chalcopyrite by T.ferrooxidans. It is well-known that activated carbon adsorbs organic ions. Therefo, the effect of addition of activated carbon on the bioleaching of chalcopyrite was also investigated.\n\n1. The preliminary experiment showed that optimum pH of the bacterial leaching of chalcopyrite was 1.7. In order to adapt to grow at the low pH, the culture of Beijerinckia indica was sequentially inoculated in the medium with decreasing pH of it from 3.0. Howeber, B.indica did not grow below pH3.0. A bacterial leaching test was carried out using a mixed culture with T.ferrooxidans and B.india at the initial pH 0f 3.0, but the copper extraction was not enhanced.\n\n2. The addition of activated carbon accelerated the copper extraction in the bacterial leaching of chalcopyrite. The yield of copper after 35 days of bacterial leaching with or without lg of activated carbon were respectably 55% and 10%. The amount of copper extraced increased with decrease in the particle size of activated carbon added.","subitem_description_type":"Other"}]},"item_28_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"NAKAZAWA, Hiroshi"}]}]},"item_28_text_4":{"attribute_name":"著者(機関)","attribute_value_mlt":[{"subitem_text_value":"岩手大学工学部"}]},"item_28_version_type_27":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"中澤, 廣"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-11-14"}],"displaytype":"detail","filename":"kaken06651090.pdf","filesize":[{"value":"721.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"kaken06651090.pdf","url":"https://iwate-u.repo.nii.ac.jp/record/9656/files/kaken06651090.pdf"},"version_id":"fad2b9c6-1b5f-4093-94ee-fbefeb506dce"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Activated carbon","subitem_subject_scheme":"Other"},{"subitem_subject":"Bacterial leaching","subitem_subject_scheme":"Other"},{"subitem_subject":"Chalcopvrite","subitem_subject_scheme":"Other"},{"subitem_subject":"Extracellular substances","subitem_subject_scheme":"Other"},{"subitem_subject":"Nitrogen fixing organism","subitem_subject_scheme":"Other"},{"subitem_subject":"Symbiotic relationship","subitem_subject_scheme":"Other"},{"subitem_subject":"T.ferrooxidans","subitem_subject_scheme":"Other"},{"subitem_subject":"Thiobacillus ferrooxidans","subitem_subject_scheme":"Other"},{"subitem_subject":"バクテリアリーチング","subitem_subject_scheme":"Other"},{"subitem_subject":"代謝産物","subitem_subject_scheme":"Other"},{"subitem_subject":"共生","subitem_subject_scheme":"Other"},{"subitem_subject":"活性炭","subitem_subject_scheme":"Other"},{"subitem_subject":"窒素固定菌","subitem_subject_scheme":"Other"},{"subitem_subject":"鉄酸化最近","subitem_subject_scheme":"Other"},{"subitem_subject":"黄銅鉱","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"黄銅鉱のバクテリアリーチングに及ぼす窒素固定菌の共生の影響","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"黄銅鉱のバクテリアリーチングに及ぼす窒素固定菌の共生の影響"}]},"item_type_id":"28","owner":"3","path":["1516"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-01-30"},"publish_date":"2012-01-30","publish_status":"0","recid":"9656","relation_version_is_last":true,"title":["黄銅鉱のバクテリアリーチングに及ぼす窒素固定菌の共生の影響"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-05-16T11:00:49.620427+00:00"}