Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Shigeshi Fuchida"'
Autor:
Mauricio Córdova-Udaeta, Bowen Cheng, Shigeshi Fuchida, Yutaro Takaya, Keishi Oyama, Chiharu Tokoro
Publikováno v:
Journal of Chemical Engineering of Japan, Vol 57, Iss 1 (2024)
Manganese (Mn2+) oxidation is an important phenomena in environmental and industrial processes. This study aims to shed light on the mechanism by which NaClO oxidizes Mn2+ to precipitate MnO2 in the presence of HCl. Experiments at pH = 1.5 indicated
Externí odkaz:
https://doaj.org/article/30f3c8bfae1c4e38967883c28449f70a
Publikováno v:
Journal of MMIJ, Vol 138, Iss 11, Pp 160-169 (2022)
This study examined effective removal methods for high amounts of manganese (Mn) and zinc (Zn) in acid mine drainage (AMD) by addition of different neutralizing agents (NaOH and NaClO) and synthesized birnessite (δ-MnO2) using two-type AMD samples w
Externí odkaz:
https://doaj.org/article/549cb36530c94c27bc1c66de69232bf2
Publikováno v:
Journal of MMIJ, Vol 138, Iss 2, Pp 19-27 (2022)
In decades, various studies on passive treatment methods of acid mine drainage (AMD) have been actively conducted in order to reduce the cost of AMD treatment. Open limestone channel is one of the most common methods and has already been implemented
Externí odkaz:
https://doaj.org/article/0b32555aecb646dfb88a5118518bb285
Publikováno v:
Journal of MMIJ, Vol 137, Iss 12, Pp 116-122 (2021)
Acid mine drainage (AMD) generation is a serious problem from the environmental and economic perspectives, because it contains a large amount of heavy metals and because there are high costs associated with maintaining the facilities, purchasing neut
Externí odkaz:
https://doaj.org/article/866e076f79154276af1a7a0ab4658794
Autor:
Keishi Oyama, Kentaro Hayashi, Yusei Masaki, Takaya Hamai, Shigeshi Fuchida, Yutaro Takaya, Chiharu Tokoro
Publikováno v:
Materials, Vol 16, Iss 3, p 928 (2023)
A passive treatment process using sulfate-reducing bacteria (SRB) is known to be effective in removing heavy metals from acid mine drainage (AMD), though there has been little discussion of the mechanism involved to date. In this work, a sulfate-redu
Externí odkaz:
https://doaj.org/article/e1459cbe675340f7bf814eded5ea4980
Publikováno v:
Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-14 (2019)
Abstract Concentrations of arsenic (As) and its chemical forms were determined on deep-sea sediments drilled at three sites of Nankai Trough, off the Kii Peninsula, Japan. Those sediments were analyzed to document the behavior of As in relation to me
Externí odkaz:
https://doaj.org/article/660344f845f545d68ffab184c3c2c57c
Autor:
Shigeshi Fuchida, Jun-ichiro Ishibashi, Kazuhiko Shimada, Tatsuo Nozaki, Hidenori Kumagai, Masanobu Kawachi, Yoshitaka Matsushita, Hiroshi Koshikawa
Publikováno v:
Geochemical Transactions, Vol 19, Iss 1, Pp 1-15 (2018)
Abstract We observed the initial release rate of metals from four fresh (i.e., without long time exposure to the atmosphere) hydrothermal sulfide cores into artificial seawater. The sulfide samples were collected by seafloor drilling from the Okinawa
Externí odkaz:
https://doaj.org/article/9b8d2efa4ecb4d648511801931c367a0
Publikováno v:
Progress in Earth and Planetary Science, Vol 5, Iss 1, Pp 1-15 (2018)
Abstract Noble gas abundance and isotope data from 12 drilling mud gas samples obtained during IODP Expeditions 338 and 348 provide new insights on fluid origin and fluid migration in the inner accretionary prism below the Kumano forearc basin offsho
Externí odkaz:
https://doaj.org/article/d310f90999904699a40cf757722ed2a1
Publikováno v:
Minerals, Vol 12, Iss 1, p 99 (2022)
Manganese (Mn) is a major element in various aqueous and soil environments that is sometimes highly concentrated in mine water and other mineral processing wastewater. In this study, we investigated Mn removal from alkaline mine water (pH > 9) with a
Externí odkaz:
https://doaj.org/article/7c858c83122640ee83f6211ddaebc74e
Publikováno v:
Minerals, Vol 12, Iss 2, p 115 (2022)
In this study, we investigated the localized and concomitant precipitation of calcium (Ca)/magnesium (Mg)-bearing species and iron oxides/oxyhydroxides, and their depression characteristics to the pyrite floatability in flotation process at pH 9 and
Externí odkaz:
https://doaj.org/article/a477b5ef3daf47e7ad9fffe690cae61f