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

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

Akira OTSUKI Guangjun MEI Yuren JIANG Mitsuaki MATSUDA Atsushi SHIBAYAMA Jun SADAKI Toyohisa FUJITA

出版者

The Resources Processing Society of Japan

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.53, no.3, pp.121-133, 2006 (Released:2006-09-20)

参考文献数

13

被引用文献数

16 22

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Two-step liquid-liquid extraction methods using aqueous and organic phases for separation of red (Y2O3: Eu3+), blue (BaMgAl10O17: Eu2+) and green (CeMgAl10O17: Tb3+) fine fluorescent powders were proposed in this paper. At first, the blue powder was extracted selectively into heptane phase using a chelating agent, 2-thenoyltrifluoroacetone (HTTA, CF3COCH2COC4H3S) under alkaline pH condition. Then, chloroform was used for extracting the green powder into the chloroform phase. The red powder separating from the green powder remained in aqueous phase with a depressant, potassium sodium tartrate tetrahydrate (PST, KNaC4H4O6·4H2O). The powders could be well separated in terms of their grade and recovery. The results suggested directions for future research into the recycling of fluorescent powders from fluorescent lights.

著者

鈴木 祐麻 新苗 正和 真田 靖瑛

出版者

環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.59, no.2, pp.73-80, 2012 (Released:2012-09-05)

参考文献数

13

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Moringa oleifera (M. oleifera) is one of the most widely spread Moringa species that grows quickly in the tropical belt. The objective of this study was to investigate the influence of the aqueous pH, initial turbidity of the synthetic kaolin turbid water, ionic strength, and humic substances on the efficiency of the M. oleifera coagulant. The experimental results showed that the coagulation efficiency was significantly enhanced by the presence of divalent cations such as Ca2+ or Mg2+, and slightly enhanced by lowering the aqueous pH from 9.0 to 4.0. It was also found that fulvic acid did not significantly affect the coagulation efficiency, while the initial turbidity and humic acid did. M. oleifera coagulant was effective for synthetic waters of an initial turbidity of 290 NTU. However, turbidity removal was not observed when the initial turbidity was lowered to 45 NTU. The presence of humic acid significantly increased the coagulant dosage required for turbidity removal. These obtained experimental observations were then used to discuss the influence of the water quality on the dominant coagulation mechanism.

著者

宮武 宗利 林 幸男

出版者

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.4, pp.153-158, 2009 (Released:2009-11-21)

参考文献数

12

被引用文献数

1 6

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Biomethylation of arsenic is usually considered as a detoxification of arsenic because toxicity of most organic methylated arsenic is much less than that of inorganic arsenic. We investigated the feasibility of a novel bioremediation using an arsenic methylating bacterium. An arsenic methylating bacterium Bacillus cereus strain R2, isolated from soil in Miyazaki, was evaluated for growth characteristics and arsenic metabolism. The growth of strain R2 was inhibited in 50.0 mg As/l arsenic medium. Strain R2 metabolized arsenite (

著者

胡 浩 小野田 弘士 中島 賢一 永田 勝也

出版者

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.2, pp.53-60, 2010 (Released:2010-06-04)

参考文献数

15

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In recent years, the exportation of resources such as iron, aluminum and copper scrap etc. including e-wastes, is increasing in Japan under the background of economic development in Asia, while exported resources sometimes are processed improperly in developing countries that breed environmental pollution. Therefore, an appropriate physical distribution management system with traceability for the resources is necessary. This paper attempts to build a model of International Resource Recycling System using Information Technology such as Global Position System (GPS), Radio Frequency Identification (RFID) tags, etc. between Japan and China by means of an international accepted traceability system. We also did a demonstration test between Japan and China. As a result, it is confirmed that the traceability system (covered from emission, collection in Japan to processing and landfill facilities in China) is an effective mean to ensure appropriate process of transportation, processing and final disposal of the residue of each stage.

著者

鈴木 祐麻 Noor Diyana Binti Jamil 新苗 正和

出版者

環境資源工学会

雑誌

環境資源工学 (ISSN:13486012)

巻号頁・発行日

vol.60, no.3, pp.138-144, 2013 (Released:2013-10-15)

参考文献数

18

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The objective of this study was to investigate the disinfection efficiencies of E. coli and coliforms during the solar disinfection (SODIS) process with the presence of zero-valent iron and/or citric acid. The experimental results from a series of batch experiments showed that a treatment with neither sole UV-A (365 nm wavelength), zero-valent iron, nor citric acid effectively decreased the fraction of viable E. coli and coliforms under the experimental conditions investigated in this study. However, the simultaneous addition of zero-valent iron and citric acid during the UV-A illumination effectively decreased the fraction of viable E. coli and coliforms, meaning the co-existence of these three are required to effectively produce oxidants such as hydroxyl radical and ferryl ion. It was also demonstrated through field experiments that the technology proposed in this study can be easily implemented in our daily life using lemon juice rich in citric acid.

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.