論文 - ＴＯＵＣＨ ＮＡＲＯＮＧ
-
Movement and retention behaviors of sediment in sand beds
TOUCH NARONG
博士論文 2013年03月
担当区分：筆頭著者 記述言語：英語 掲載種別：学位論文（博士）
地盤内での物質輸送は土壌環境や地下水質等の分野で必要とされ，本論文では砂地盤内での汚泥粒子の輸送機構を明らかにするとともに，汚泥粒子の残留量を推定するモデルおよび測定方法，残留に伴う地盤の透水性低下量を推定するモデル等について示した．
-
An experimental study on organic fine particles movement inside sand layer
TOUCH NARONG
修士論文 2010年03月
担当区分：筆頭著者 記述言語：英語 掲載種別：学位論文（修士）
本論文では，生態環境が悪化した干潟の再生や豊かな生態環境を有する人工干潟の造成を行うために，砂層内での有機微細粒子（有機物が付着した土粒子）の移動に関する輸送機構，測定方法，および推定モデルについて示した．
-
食品廃棄物を用いた二層型高炉スラグー堆積微生物燃料電池のカソード層構造の提案 査読あり
重冨 宏太, TOUCH NARONG, 中村 貴彦
応用細胞生物学研究 37 ( 0 ) 17 - 26 2024年12月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
本研究では、微生物燃料電池（MFC）の発電性能向上を目的に，カソード層水の交換による影響を検討した．連続的な水交換は内部抵抗を増加させ性能を低下させたが，7日ごとの水交換がカソード電位を維持し，最適な発電効率を示した．
-
The Dynamics of Greenhouse Gas Emission during Food Waste Composting 査読あり 国際共著 国際誌
Lioba Chelangat Ronoh, Machito Mihara, John Bosco Mukundi，Catherine A. Ngamau, Aggrey Adimo and Narong Touch
Journal of Agriculture Science & Technology (18th JKUAT Scientific, Technological and Industrialization Conference) 23 ( 4 ) 104 - 121 2024年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（研究会，シンポジウム資料等）
This study investigated the dynamics of greenhouse gas (GHG) emissions during the composting of organic waste. Cow dung and food waste were mixed in different ratios and composted for 60 days. The mixture containing 25% cow dung and 75% food waste had the lowest emissions, which were within the EPA's recommended range.
-
Enhancing Plant Growth using a 6 V Solar Cell–Powered Electrokinetic Treatment 査読あり
TOUCH NARONG, NAKAMURA TAKAHIKO
International Journal of Environmental and Rural Development 15 ( 2 ) 16 - 21 2024年12月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Application of electrokinetic treatment powered by a 6 V solar cell (ET-6V) has been found to release essential nutrients (N, P, and K) from saturated organic soil. Additionally, this treatment accelerates the growth of Japanese mustard spinach near the anode due to oxidation reactions. However, growth inhibition occurs near the cathode due to reduction reactions. These effects may vary in unsaturated soils managed with irrigation water. Therefore, the aim of this study was to determine the effects of ET-6V on plant growth in unsaturated soils through laboratory experiments. Specifically, we examined changes in electrode potential and the growth rate of Japanese mustard spinach after applying ET-6V to andosol mixed with cow manure compost. Although reduction reactions occurred at the cathode, facilitating the flow of irrigation water through the soil layer maintained a stable cathode potential exceeding 0 V. Growth rate measurements revealed a 1.2–1.8-fold increase in the wet weight of Japanese mustard spinach near both the anode and cathode. Notably, the growth rate of spinach was higher in the soil located 5–20 cm from both electrodes. Surprisingly, reduction reactions did not negatively affect growth rate but instead contributed to increased Japanese mustard spinach growth in unsaturated soil. The enhancement of soil potential through irrigation water is a key driver underlying this growth. Therefore, ET-6V should be applied to upper-land soils to boost crop productivity.</p>
-
食品廃棄物を燃料とした高炉スラグ－堆積物微生物燃料電池の発電性能に及ぼすカソード層水の交換の影響 査読あり
TOUCH NARONG, XIAO XIAO
廃棄物資源循環学会研究発表会講演集 35 ( 0 ) 255 - 256 2024年09月
担当区分：筆頭著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：一般社団法人 廃棄物資源循環学会
これまで開発してきた一層型の食品廃棄物を燃料とした高炉スラグ－堆積物微生物燃料電池（SS-SMFC）においてアノード層から食品廃棄物の粒子浮上や有機物分解から生成された物質がカソード層への溶出があり， 7日間でSS-SMFCの電流密度が著しく低下した．本研究ではSS-SMFCの構造を一層型から二層型に変更し，カソード層水を越流（交換）させた．カソード層水の交換に伴うSS-SMFCの発電性能の変化を検討するとともに，交換したカソード層の水質を検討した．実験結果により，カソード層水の交換によりカソード電位が0 mV以上に維持されているが，水交換なし条件に比べて通電してから4日間の発電量が少なくなることが明らかになった．すなわち，連続の水交換が必要なく，4日ごとに水交換を行えば電力を多く回収できる．また，カソード層水には窒素成分が多く含まれており，液肥として使用できる可能性が高いことがわかった．
-
高炉スラグ－堆積物微生物燃料電池によるリン除去の効率化
TOUCH NARONG
廃棄物資源循環学会研究発表会講演集 35 ( 0 ) 319 - 320 2024年09月
担当区分：筆頭著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：一般社団法人 廃棄物資源循環学会
数年前から，微生物燃料電池（MFC）によるリン回収が検討されている．しかしながら，MFCには高価なイオン交換膜が用いられており，実用化を妨げている．本研究ではイオン交換膜を必要としない高炉スラグー堆積物微生物燃料電池（SS-SMFC）を利用することにした．本研究の目的はSS-SMFCによるリン酸除去の効率を評価することである．実験結果により，SS-SMFCを使用することで堆積物微生物燃料電池（SMFC）に比べて10倍の電流密度が得られた．SS-SMFCのリン酸除去率が高く，さらに除去期間が短縮できることからSS-SMFCはリン酸除去を効率化できることが明らかになった．また，SSから溶出したイオンがリン酸固定に寄与していることがわかった．SS-SMFCにおいてpHが9以上であり，カルシウムイオンによるリン酸固定を促進させたことが推定された．
-
TOUCH NARONG, HIBINO TADASHI
International Journal of Environmental and Rural Development 15 ( 1 ) 177 - 182 2024年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
Sediment microbial fuel cell (SMFC) performance can be improved using electrodes fermented with and without aeration as cathodes and anodes, respectively. However, this improved performance does not exceed 60 days. In this study, the cathode water-based factors affecting SMFC performance were identified using long-term electricity generation. Meanwhile, SMFC performance (polarization) was measured in experimental conditions. In addition to the polarization measurement, the pH, electrical conductivity (EC) of the cathode water, and adenosine triphosphate (ATP) on the cathode surface were measured. Experiments were conducted with and without the overflow of cathode water. Thereafter, the scanning electron microscopy-energy dispersive X-ray (SEM-EDX) analysis of the cathodes was performed. In line with existing literature, SMFC performance began to decrease on Day 60 from the commencement of the experiments. Furthermore, the pH difference before and after Day 60 was within 0.2, indicating that the pH of the cathode water did not directly affect SMFC performance. Moreover, EC was kept low with cathode water overflow, significantly decreasing SMFC performance. Further, the SMFC performance increased with an increase in ATP, indicating that the bacterial activities on the electrode affected SMFC performance. The SEM-EDX results revealed that metal ions that were obtained from the dissolution of steelmaking slag attached to the cathode surface, indicating the crystallization of these metal ions during the experiments. These findings indicate that the crystallization on the cathode driven by long-term electricity generation inhibited bacterial activities and cathode reactions, thereby decreasing SMFC performance.
-
TOUCH NARONG, SHIGETOMI KOTA, HIBINO TADASHI
International Journal of Environmental and Rural Development 15 ( 1 ) 47 - 52 2024年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
Lactic acid bacteria (LAB) and iron ions dissolved from steelmaking slag (SS), when attached to an electrode surface, improve the performance of carbon fiber electrodes. However, the electrode potential decreases during the attachment (fermentation without aeration), leading to decreased electrode performance when used as a cathode. Additionally, SS dissolution increases the solution pH, which can affect the survival rate of LAB. This study examines the effects of aeration on an electrode potential and solution pH on the survival rate of LAB in solution during fermentation. In the experiments, SS, LAB beverage, bamboo powder, and carbon fiber electrodes were placed in a bottle with and without aeration. Temporal measurements of the solution pH, iron ion concentrations, adenosine triphosphate (ATP), and electrode potential were performed. The results showed that aeration could prevent a 0.5-fold decrease in the electrode potential due to fermentation. The solution pH temporarily increased and exceeded eight during the fermentation, suggesting that SS had been dissolved. ATP began to decrease when the solution pH exceeded 8, indicating that the solution pH influences the survival rate of LAB. It is recommended that the fermentation should be conducted within three days. Furthermore, to improve the performance of a sediment microbial fuel cell (SMFC), the electrodes with and without aeration should be used as the cathode and anode of SMFC, respectively.
-
Introduction: Sustainability as an agroecological strategy toward resilience in agricultural systems 査読あり
Gheorghe Cristian Popescu, Monica Popescu, Silvia Pampana, Moniruzzaman Khondker, Mikihisa Umehara, Hisayoshi Hayashi, Narong Touch
Agronomy Journal 115 ( 6 ) 2657 - 2664 2023年12月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
本論文では森林，作物，農業システム，動物生産に関連する特定の問題を特製し，最新の農業ツール，天然資源の効率的な使用，およびスマートデバイス技術を適用することで改善され，回復力を高めることができることが示唆された．
DOI： 10.1002/agj2.21483
-
食品廃棄物を燃料とした高炉スラグ－堆積物微生物燃料電池のアノード層構造の提案 査読あり
重冨 宏太, TOUCH NARONG, 中村 貴彦, XIAO XIAO
第34回廃棄物資源循環学会研究発表会講演集 34 ( 0 ) 301 - 302 2023年09月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：一般社団法人 廃棄物資源循環学会
<p>著者らは利用率の低い食品廃棄物に着目し，食品廃棄物を高炉スラグ－堆積物微生物燃料電池（SS-SMFC）の燃料としての利用に関する研究を行ってきた．本研究では食品廃棄物を用いたSS-SMFCのアノード層構造を検討し，発電性能の高い構造を提案することを目的としている．実験結果により，実用化に向けて食品廃棄物を用いたSS-SMFCのアノード構造を確立できた． なお，時間経過とともにカソード層水の水質が悪化し，本実験のスケールでは6日以降に発電性能が低下した．今後，発電性能を維持できるカソード層の構造や水質改善できる工夫を考える必要がある．</p>
-
太陽電池を用いた動電学的手法による作物生産性向上の検討 査読あり
TOUCH NARONG, 小川 航平, 中村 貴彦
第34回廃棄物資源循環学会研究発表会講演集 34 ( 0 ) 235 - 236 2023年09月
担当区分：筆頭著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：一般社団法人 廃棄物資源循環学会
<p>本研究では6 Vの太陽電池を用いた動電学的手法を飽和状態の牛糞堆肥混合した黒ボク土（堆肥混合体積率47%）に適用し，小松菜の栽培試験により作物の生育に対する本技術の効果を検討した．この結果，作物の生育に及ぼすアノードでの酸化反応の影響は極めて低い．これに対して，カソードでの還元反応は作物の生育に影響を顕著に及ぼすことがわかった． アノードから40 cm以内土壌では作物の生産性が向上される可能性が高いと明らかになった．なお，カソードの20 cm周辺土壌での生育は還元反応の影響を受けることが分かった．今後，圃場（排水灌漑）条件での本技術の効果を検証することが必要である．</p>
-
Improvements in Preservation Properties of Homemade-Style Pickled Cucumber in Cambodia
SORM SOKLY, MURAMATSU SHUKI, UCHINO MASATAKA, MURAMATSU YOSHIKI, OKA DAIKI, TOUCH NARONG, TANIOKA YURI, NAKAMURA TAKAHIKO, NAKAJIMA TORU, SEKIDO MOTOE, KAWAKAMI SHOTARO, CHAY CHIM, ARIMITSU MARI, MIHARA MACHITO
International Journal of Environmental and Rural Development 14 ( 1 ) 25 - 31 2023年06月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Pickled cucumbers selling at wet markets in Cambodia are popular among local people. It has been reported that pickles using homemade recipes are at a high risk of spoiling and causing food poisoning, as there are no heating steps in the production process. Therefore, it is necessary to improve the hygienic conditions of the food supply to make safe pickles in Cambodia. Heat treatments using hot pack filling and pasteurization lead to microbiologically safe products and extended shelf life. This study aimed to examine the effect of heat treatments (hot pack filling and pasteurization) on preservative properties and to evaluate the acceptability of the pickled cucumbers prepared with the heating process. Pickled cucumbers prepared with and without the heating process were made using a traditional Cambodian recipe and stored at 30 °C for 7 days. The presence of total viable bacteria, coliforms, <i>Escherichia coli</i>, yeasts, and molds in the pickled products was tested during the storage periods. The samples without the heating process resulted in contamination with coliforms,<i> E. coli</i>, yeasts, and molds and were in an initial putrefactive state because of the number of total viable bacteria. On the other hand, coliforms, <i>E. coli</i>, yeasts, and molds were not detected in the samples prepared with the heating process from Day 0 to Day 7. This result indicated that the pasteurization treatment killed many spoilage microbes, including foodborne pathogens. To investigate the acceptability of the pickled cucumbers prepared with the heating process, sensory evaluation tests were performed. From the results of the sensory evaluation and questionnaire survey, there was the possibility of acceptance of the pickled cucumbers prepared with the heating process made either in Japan or Cambodia by the Cambodian panelists; however, further improvement in the softness of the pickles was commented upon.</p>
-
Reuse of Unavailable Phosphate in Soils Using Solar Cell-Powered Electrokinetic Treatment 査読あり
TOUCH NARONG, NAKAMURA TAKAHIKO
International Journal of Environmental and Rural Development 14 ( 1 ) 32 - 37 2023年06月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Electrokinetic treatment (ET) is widely used for soil remediation, specifically for removing heavy metals from soil. Till date, we have focused on the nutrients released in soils using a solar cell-powered ET, which contributes to increasing the productivity of organic farming. Previously, when a 1.5 V solar cell was used in ET, the release of ammonium ions and the growth of microorganisms were observed. However, no release of phosphate ions was observed. Thus, it is presumed that a 1.5 V solar cell is insufficient to release phosphate in soils. Therefore, this study aims to examine the effects of solar cell voltage on the release of phosphate in soils. In laboratory experiments, an anode (oxidation reaction) and a cathode (reduction reaction) were installed in andosol mixed with cow manure compost, and a 3 or 6 V solar cell was used to produce an electric current between the two electrodes. Sixty-two days after the current generation, the chemical properties of the soil were measured. The results suggest that soil redox conditions can be controlled by changing the solar cell voltage. From the pH distributions, a higher voltage of solar cells was used and a large change in pH was obtained. Furthermore, a decrease in soil redox potential was obtained by increasing the solar cell voltage. From the phosphate distributions, a 6 V solar cell is required to release phosphate in soils. It is recommended that applying ET powered by a 6 V solar cell (potential gradient: 0.12 V/cm) facilitates nutrient release in soils, which is the most important factor in organic farming. </p>
-
Changes in Soil Physical Properties Owing to Soil Reduction Treated with Electrokinetic Treatment
NAKAMURA TAKAHIKO, TOUCH NARONG
International Journal of Environmental and Rural Development 14 ( 2 ) 132 - 137 2023年
記述言語：英語 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Increasing soil water content due to soil reduction is generally confirmed in rice paddy soils after flood irrigation or in littoral sediments with high organic matter content. This could be caused by soil aggregates during the reduction process through biological and electrostatic phenomena. In the literature, changes in liquid and plastic limits owing to soil reduction treated with electrokinetic treatment (ET) have been reported; however, there was no report relating to changes in other soil physical properties, such as grain size distribution (GSD) and water-holding capacity (WHC). Thus, this study aimed to examine changes in soil physical properties caused by soil reduction treated with ET. Changes in GSD, hydraulic conductivity, and WHC were examined in laboratory experiments to understand soil aggregates due to soil reduction. During ET application, a decrease in electrical conductivity was observed, indicating the cohesion of ions (soil aggregate). This resulted in increases in the percentage of particles ranging from 0.075-0.212 mm, hydraulic conductivity, and WHC. However, particle dispersion occurred when the electrical current was high (10 mA), resulting in a significant decrease in hydraulic conductivity and WHC. Therefore, it can be said that soil aggregates can develop electrostatically. Thus, ET can be used for developing soil aggregate.</p>
-
Benefits of Applying Microbial Fuel Cell Technology in Organic Farming for Sustainable Agriculture 査読あり
TOUCH NARONG, NAKAMURA TAKAHIKO
International Journal of Environmental and Rural Development 13 ( 2 ) 49 - 54 2022年12月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Increasing the productivity of organic farming is a strategy to achieve sustainable agriculture. However, it is necessary to maintain soil redox potential (ORP) in continuously oxidized conditions and to promote bacterial metabolisms in soils to increase productivity. Previously, applying microbial fuel cell technology (MFCT) into sediment improved ORP and benthos survival in the sediment. It is thought that these positive effects of MFCT can also provide many benefits for soil cultivation in organic farming. This study aims to examine the changes in the biochemical properties of soil following MFCT application. In laboratory experiments, MFCT was applied to cow manure compost-mixed andosol. An anode (oxidation reaction) and a cathode (reduction reaction) were installed in the soil, and a 1.5-V solar cell was used to produce an electric current between the two electrodes. Three months after MFCT application, the chemical properties and adenosine triphosphate (ATP) of the soil were measured. Our results showed an electric potential distribution in the soil, and the soil located within 20 cm of the electrode was strongly affected by the electrode reaction. This suggests that applying MFCT to soil can change the soil's redox conditions. The ATP and ammonium concentrations increased, suggesting bacterial activation and enhanced organic matter decomposition in the soil. It is recommended that farmers should apply MFCT into soils for enhancing bacterial metabolism and increasing organic matter decomposition in soils.</p>
-
燃焼温度と燃焼時間が底泥の強熱減量値に与える影響の検討 査読あり
中下 慎也, KIM Kyeongmin, TOUCH Narong, 日比野 忠史
土木学会論文集B2(海岸工学) 78 ( 2 ) 871 - 876 2022年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
強熱減量試験の燃焼温度，燃焼時間は研究者によって異なっている．異なる測定条件で測定された強熱減量値を比較するためには，燃焼温度，燃焼時間による強熱減量値の変化を明らかにする必要がある．本研究では有機物量が異なる2つの底泥を対象として強熱減量試験と空気雰囲気で実行した熱重量示差熱分析で得られた結果を比較し，燃焼温度や燃焼時間を変化させた強熱減量値を比較した．850℃で4時間燃焼した強熱減量試験と熱重量示差熱分析の850℃における強熱減量値は一致した．また，熱重量示差熱分析では昇温速度を0.2℃/minまで遅くしても各温度の強熱減量値が異なっており，300℃での強熱減量試験では燃焼時間を長くすると強熱減量値が増加し続けたことから，電気炉の設定温度よりも高い温度で分解する物質まで燃えていることが示唆された．
-
太陽電池を用いた土壌内のリン酸生成システムの提案
TOUCH NARONG, 重冨 宏太, 中村貴彦
第33回廃棄物資源循環 学会研究発表会講演集 241 - 242 2022年09月
担当区分：筆頭著者 記述言語：日本語
本研究では電圧が異なる太陽電池と電極を利用して土壌内に還元反応を起こし，有機土壌におけるリン酸の生成特性を明らかにした．太陽電池の電圧を変化させることで，土壌の酸化還元状態をコントロールできた．負電極電位を－1 V以下に低下させることで，リン酸が生成されることがわかった．
-
食品廃棄物を燃料とした高炉スラグ－堆積物微生物燃料電池の発電性能
重冨 宏太, TOUCH NARONG, 中村貴彦
第33回廃棄物資源循環学会研究発表会講演集 223 - 224 2022年09月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
本研究はイオン交換膜が不要，かつ高性能の高炉スラグ－堆積物微生物燃料電池（SS-SMFC）の燃料として食品廃棄物を用い，SS-SMFCの発電性能および通電に伴う有機物の分解特性を検討した．SSを用いることで栄養塩類を効率的に除去で，食品廃棄物に含まれる有機物の分解が促進されることが明らかになった．
-
Enhancement of carbon fiber electrode performance using lactic acid bacteria and steelmaking slag 査読あり 国際誌
Narong Touch and Tadashi Hibino
International Journal of Environmental and Rural Development 13 ( 1 ) 130 - 135 2022年06月
担当区分：筆頭著者 記述言語：英語
本研究ではカーボン繊維に乳酸菌と高炉スラグから溶出した鉄イオンを付着させ，電極の発電性能を検討した．乳酸菌または鉄イオンの付着により電極性能が向上するが，両者が付着した条件では性能が宅なることが明らかになった．