著者

萩野 隆生 平島 剛

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.52, no.4, pp.172-182, 2005 (Released:2005-12-08)

参考文献数

7

被引用文献数

13 12

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A novel process for effectively recovering phosphorus from waste has been developed. By this process, magnesium ammonium phosphate (hereinafter referred to as MAP) is recovered from anaerobic digestive sludge in sewage. The MAP recovery process involves recovering inorganic fine particles, which include the MAP particles, from digestive sludge through a successive line of separating devices such as, a vibrating screen, a hydro-cyclone, and a revolving-cylindrical type thin flow separator or multi-gravity separator. Continuous tests for MAP recovery carried out to study the performance of this process indicate that it was possible to recover about 90% of MAP.

著者

濱井 昂弥 堀内 健吾 古川 創

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.69, no.2, pp.71-79, 2022 (Released:2023-02-01)

参考文献数

20

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In Japan, many studies have been conducted to reduce the cost of mine drainage treatment at abandoned mines. The treatment method called “passive treatment” that utilizes natural purification and is expected to be applied to mine drainage treatment.Following the completion of the guidelines on the introduction of passive treatment, we conducted a simple screening focused on water quality, quantity and utilizable blank space to review the applicability of passive treatment to abandoned mines in Japan.Our findings indicate that passive treatment has the potential to be applied to many of abandoned mines in Japan, although there are still some issues to be solved.

著者

王 立邦 DODBIBA Gjergj 岡屋 克則 定木 淳 藤田 豊久 菱田 元

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.57, no.1, pp.20-28, 2010 (Released:2010-04-10)

参考文献数

19

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In order to recover trace of platinum (Pt) from hydrochloric acid (HCl) leaching solution of Cobalt-Rich Crust (CRC), the absorption properties of four kinds of seaweeds (Undaria pinnatifida, Laminaria angustata, Enteromorpha linza and Gloiopeltis tenax) and activated carbon were studied. At first, their adsorption abilities for Pt ion as well as selective adsorption properties for other coexisting metal ions contained in CRC (including iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni) and copper (Cu)) were investigated by using artificial solutions. Finally, the application to CRC HCl leaching solution was also carried out. The results showed that all seaweeds achieved their best Pt adsorption capacity only at pH 2, whereas activated carbon possessed a high Pt adsorption ability over a wide pH range from pH 0 to 6 as well as in HCl solution up to 3 mol/L. Regarding the CRC leaching solution obtained by 0.5 mol/L HCl and 1 vol.% hydrogen peroxide (H2O2), 46.9% and 100% Pt was recovered by Enteromorpha linza and activated carbon, respectively. It was found that seaweed and activated carbon are both effective adsorbents for recovering Pt from HCl leaching solution of CRC.

著者

浜田 善久

出版者

一般社団法人 環境資源工学会

雑誌

資源処理技術 (ISSN:09124764)

巻号頁・発行日

vol.35, no.4, pp.191-197, 1988-12-30 (Released:2009-06-05)

参考文献数

11

著者

宮本 英昭

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.68, no.1, pp.3-9, 2021 (Released:2021-10-01)

参考文献数

10

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More than 200 spacecraft have successfully explored about 100 extraterrestrial bodies, including all planets and their major satellites. In-situ observations and return-sample analyses revealed the orbital parameters and compositional distributions of solar system bodies, which are essential to discuss possible utilization of space materials. At an early stage of the future in-situ resource utilization (ISRU), the availability of volatiles, including water on asteroids and putative ice on the Moon, becomes a primary issue, especially for their utilization as propellants. Autonomous transportation systems between solar bodies would then be supported by such volatile materials obtained on small bodies. Infrastructures, including bases, could be developed with materials excavated from appropriate bodies and transferred through such a system. Extensive utilization of space resources on Earth may happen but not in the near future.

著者

俵 那至 大矢 仁史 矢次 知明 平林 欣也 小田 晃輔

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.66, no.4, pp.128-132, 2020 (Released:2020-09-30)

参考文献数

5

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“Art Clay Silver (Silver Clay)”, developed as a silver recycled product, is a mixture of fine powdered silver and binder for easily making silver accessories after sintering at 650°C. In this study, in order to find the optimum binder amount to maximize the strength of the sintered product, the filling structure of sintered Silver Clay was analyzed at various binder amounts under three particle size fractions (fine, coarse, and their equal weight mixture) on the basis of the measurements of porosity, shrinkage rate, strength, and pore size distribution together with SEM observation. As a result, we found that the filling structure was controlled by changing the particle size and the binder amount, and that the binder addition of 5–8% to fine particle fraction yielded the minimum porosity and maximum strength.

著者

中尾 幸道

出版者

一般社団法人 環境資源工学会

雑誌

資源処理技術 (ISSN:09124764)

巻号頁・発行日

vol.44, no.3, pp.155-158, 1997-10-08 (Released:2009-06-05)

参考文献数

5

被引用文献数

1 1

著者

新苗 正和 西垣 広大

出版者

一般社団法人 環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.56, no.2, pp.64-67, 2009 (Released:2009-06-23)

参考文献数

7

被引用文献数

1 1

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The biodegradable chelating agents [S,S]-ethylenediaminedisuccinic acid (EDDS) and the low biodegradable chelating agent ethylenediaminetetraacetic acid (EDTA) were investigated for their removal efficiency of lead from soil by soil washing. In the soil washing tests, the removal efficiency of lead with EDTA was high in the wide pH range and the efficiency of lead removal with EDDS increased with increasing pH. However, EDDS has no effect on the removal of lead in the acidic region below pH 5.5. Acid contribution was predominant for the removal of lead with EDDS below pH 5.5 and the complexation between EDDS and lead were negligible. The reaction rates for extraction of lead with EDTA and EDDS were represented by the volume reaction model. The activation energies of these extraction reactions are over 55 kJ/mol and the apparent reaction rate constants are not affected by the stirring speeds, therefore it is considered that these extraction reactions are chemically controlled.