Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Maamoun, I.; Rushdi, M.*; Falyouna, O.*; Eljamal, R.*; Eljamal, O.*
Separation and Purification Technology, 308, p.122863_1 - 122863_16, 2023/03
被引用回数：3 パーセンタイル：32.55(Engineering, Chemical)The aim of this study is to employ machine learning (ML) in providing high-accuracy prediction of Cr(VI) removal efficiency by nickel hydroxide (
-Ni(OH)
) unconventional sorbent, towards the new era of artificial intelligence (AI) applications in (waste) water treatment. Hence, a reliable ML modeling was conducted based on the experimental investigation, considering different reaction parameters, including -Ni(OH) dosage, initial pH, reaction temperature, and initial Cr(VI) concentration. Linear regression model was selected as the suitable regression model with respect to the obtained reasonable correlation and the less training time and evaluation time, comparing to other considered regression techniques. The adopted linear regression model, for the time corresponding Cr(VI) removal efficiencies, exhibited satisfactory prediction accuracy. Furthermore, the importance of models coefficients was determined and implied the high importance of the dosage feature. The contributive effect of the investigated features was mainly concentrated at the early stage of the reaction (5 to 10 min), with an average range of 50 to 80 %, which was in agreement with the experimental findings of the rapid and full removal of Cr(VI) by -Ni(OH). The elucidated insights into the effects of different factors that influence Cr(VI) removal process by -Ni(OH) revealed the underlying interactions and removal pathways, which shall benefit other researchers in the preliminary design of pilot-scale applications and anticipating the predicted performance.
removal from aqueous solutions; Cost-effectiveness & parametric effectsMaamoun, I.; Eljamal, R.*; Eljamal, O.*
Chemosphere, 312, Part 1, p.137176_1 - 137176_11, 2023/01
被引用回数：3 パーセンタイル：40.21(Environmental Sciences)This study aims to conduct statistical optimization of nZVI synthesis parameters towards the removal efficiency of phosphorus and nitrate, considering for the first time the cost-effectiveness index. The detailed statistical analysis was implemented to evaluate the main effects and interactions of eight synthesis parameters, including reductant concentration (R
), reductant delivery rate (R
), reductant liquid volume (R
), pH, aging time (AG
), mixing speed (M
), temperature (T), and precursor concentration (P). Results revealed that the experimental optimization of the synthesis factors improved the removal efficiency of nitrate and phosphorus by 27 and 9%, respectively, with respect to that before the optimization. ANOVA statistical results indicated the significance of phosphorus and nitrate models with p-values of all the eight main linear effects were less than 0.05. However, most of the interaction parameters were not statistically significant (higher than 0.05) in the case of nitrate model, which is unlike phosphorus model where all interaction parameters were statistically significant (less than 0.05). The normal probability plots of factors effects provided significant evidence of the significance of the investigated parameters R had the highest positive statistically significant effect on phosphorus model followed by R, R, M and T. In case of nitrate model, R, had the highest positive significant effect, followed by A
pH T MS. The cost-effective optimal constraints in this study resulted in the best economically optimized values of the nZVI synthesis parameters in terms of higher reactivity and reduced synthesis cost.
and nano zero-valent ironIslam, M. S.*; Maamoun, I.; Falyouna, O.*; Eljamal, O.*; Saha, B. B.*
Journal of Molecular Liquids, 370, p.121005_1 - 121005_11, 2023/01
被引用回数：14 パーセンタイル：90.69(Chemistry, Physical)Arsenic waste must be carefully managed because of the adverse effects of arsenic in wastewater on the ecosystem. In the present study, an environmentally friendly novel composite of microalgae and nano-zero valent iron (NZVI) was employed as an adsorbent to eliminate arsenic from the aqueous environment. Fourier Transform Infrared spectroscopy, X-ray diffraction, and scanning electron microscope images were used to characterize and analyze the CV/NZVI composites. Batch tests using initial arsenic concentrations ranging from 5 to 100 mg/L were conducted to evaluate removal efficiencies. According to kinetic analysis, the best model for fitting the experimental data was the pseudo first-order model, which had the lowest Akaike information criterion (AIC), and Bayesian information criterion (BIC) values of -23.878 and -7.902, respectively. Results alluded that physisorption is the primary mechanism influenced by As-removal by CV/NZVI composite. Due to the negative sign of the enthalpy and Gibbs free energy, the thermodynamic investigation revealed that the adsorption reaction was exothermic and spontaneous. The thermodynamic analysis also affirmed that the arsenic removal process involved primarily physisorption and slight chemisorption phenomena. Meanwhile, 1.5 g/L CV/NZVI dosage achieved 99% As(V) removal efficiency in synthetic groundwater systems, confirming the high potential of the composite in complex aqueous systems.
Idham, M. F.*; Falyouna, O.*; Eljamal, R.*; Maamoun, I.; Eljamal, O.*
Journal of Water Process Engineering (Internet), 50, p.103289_1 - 103289_16, 2022/12
被引用回数：13 パーセンタイル：91.35(Engineering, Environmental)Due to synthesis variation affecting various graphene oxide (GO) physicochemical parameters and cost efficiency aspects, the present study investigated the influence of GO precursor components for GO precipitated nZVI nanocomposite (nZVI/GO) and optimized removal conditions to remove chloramphenicol (CAP) from water. In order to synthesize nZVI/GO nanocomposites, four methods of GO precursor synthesis were used, denoted GO1, GO2, GO3, and GO4. A novel synthesis process is introduced based on economic and time-less-consuming protocols to produce GO precursor. A series of desorption experiments were also implemented in various eluents to clarify the CAP removal mechanism. Interestingly, this study demonstrated the substantial impact of GO precursor on the nanocomposite performance in eliminating CAP. The introduced novel GO successfully served as an excellent nZVI precipitation medium and enhanced CAP removal efficiency. Empirical optimization demonstrated that nZVI/GO4-1:1 could eliminate up to 91% of 100 mg/L CAP by dosage as low as 0.25 g/L at pH 5. nZVI/GO4 displayed CAP removal stability throughout a more comprehensive pH range, and remarkable recyclability, making it more promising and practical than bare nZVI and other analyzed nanocomposites. Kinetics data demonstrated a high degree of compatibility with the pseudo-first-order (PFO) and pseudo-second-order (PSO). Through kinetics and statistical analyses, desorption experiments, FTIR spectroscopy, and EDX analysis, nZVI/GO4 removed some of the CAP through the adsorption mechanism controlled by physisorption and chemisorption. In contrast, the oxidation mechanism eliminated the remaining CAP.
線による腐食影響加藤 千明; 山岸 功; 佐藤 智徳; 山本 正弘*
材料と環境, 70(12), p.441 - 447, 2021/12
ゼオライト粒子は福島第一原子力発電所(1F)の汚染水の浄化のためのセシウム吸着塔内で用いられている。使用後のセシウム吸着塔は敷地内で保管されているが、ステンレス鋼製胴部の局部腐食が懸念された。この腐食リスクに対し、線による影響データを照射下電気化学試験装置で取得した。また、内溶液の変化状態を実規模サイズのモックアップ試験装置で検討した。それらの結果から、過酸化水素による電位の上昇がゼオライト粒子の存在で防ぐことができ、塩化物イオンの濃化もそれほど生じないことを明らかにし、局部腐食が相当に小さく抑えられることを示した。
柴田 淳広; 駒 義和; 大井 貴夫
Journal of Nuclear Science and Technology, 53(12), p.1933 - 1942, 2016/12
被引用回数：19 パーセンタイル：86.61(Nuclear Science & Technology)For planning and investigating on treatment and disposal of the wastes on Fukushima Daiichi NPS, it is necessary to quantify the radioactivity inventory of them. The secondary wastes from the water treatment system are one of the major wastes and the analysis of the water of the treatment system holds the promise of giving the useful information on the inventory of damaged fuel. Therefore, the inventories of the secondary wastes and damaged fuel were estimated with a radionuclide transport model in the contaminated water. The model was developed based on unknown factors that are initial concentration in the hypothetical volume assuming the instantaneous homogeneous mixing and continuous release rate from damaged fuels. In the numerical analysis using this model, the key parameters, initial concentration C
, continuous release rate F and inventory of source of continuous release I
were given by fitting the model with analysis data of the contaminated water. By using these parameter values, the nuclides inventories in the damaged fuel and secondary waste were calculated.
Awual, M. R.; Eldesoky, G. E.*; 矢板 毅; Naushad, M.*; 塩飽 秀啓; Alothman, Z. A.*; 鈴木 伸一
Chemical Engineering Journal, 279, p.639 - 647, 2015/11
被引用回数：251 パーセンタイル：99.3(Engineering, Environmental)A novel Schiff base ligand based nano-composite adsorbent (NCA) was prepared for the detection and removal of copper (Cu(II)) ions in wastewater samples. Upon the addition of Cu(II) ions to NCA at optimum conditions, the clear color was visible to the naked-eye in the detection system. This NCA exhibited an obvious color change from yellowish to dark green in the presence of Cu(II) ions in aqueous solution. The NCA could detect the Cu(II) ions over other foreign ions with high sensitivity and selectivity. For adsorption behaviour, influences several factors such as solution pH, contact time, concentration for Cu(II) ion adsorption was investigated by batch experiment in detail. The results showed that neutral solution pH was suitable to get optimum Cu(II) ions adsorption.
Cs in radioactive wastes generated from contaminated water treatment system in Fukushima Daiichi Nuclear Power Station加藤 潤; 目黒 義弘
E-Journal of Advanced Maintenance (Internet), 7(2), p.138 - 144, 2015/08
福島第一原子力発電所の汚染水処理システムの一環として稼働しているセシウム吸着装置及び第二セシウム吸着装置から発生した使用済みセシウム吸着塔、もしくは現在停止している除染装置から発生したスラッジといった廃棄物中のCs濃度は、汚染水の分析データを用いて算出された。それに基づき、汚染水処理システムによる2011年6月6日から2014年8月12日までのCsの総除染量が見積もられた。
中西 友子*; 古川 純*; 松林 政仁
Nuclear Instruments and Methods in Physics Research A, 424(1), p.136 - 141, 1999/00
被引用回数：16 パーセンタイル：74.02(Instruments & Instrumentation)中性子コンピュータ断層撮影を用いてカーネーションの花内部の水のプロファイルを得た。花の部分を回転台上に固定し、熱中性子ビームを用いて1枚につき4秒間照射で冷却型CCDカメラを用いて撮影した。撮影枚数は1試料につき、半回転180枚(1枚/1度)とした。カーネーションは乾燥前と乾燥後の2つの試料を用意し、CTの再構成計算にはShepp-Loganフィルタを用いるフィルタ逆投影法を使用した。得られた断層画像は、これまでの投影画像では観察が困難であった花の内部における水分の分布を明らかとした。カーネーションの花のCT撮影は初めての試みであり、空間解像度において改善の必要性は認められるものの、花の内部における水の動態を解析できる有望な手法であることが示された。
作本 彰久; 宮田 定次郎
Radiation Physics and Chemistry, 24(1), p.99 - 115, 1984/00
放射線を用いて水を浄化する場合の放射線のエネルギーの利用効率を向上させるために、放射線の照射と微生物処理、凝集沈殿処理及びオゾン酸化との併用法を研究し、著しく必要線量を低減することができた。即ち、酸素が溶存している有機物水溶液を照射すると、微生物分解を有するアルコール類、アルデヒド類、酸類などを生成した。そこで、照射後微生物処理を行うことによって処理に要する線量を低減できた。酸素が溶存していない場合には、有機物は二量体化などによって高分子量化した。そのため、Fe(SO
)による凝集処理が可能になり見かけのGC-TOCIが著しく増加した。又、オゾンを併用した場合には酸化反応が連鎖的に進行するようになり、修酸の場合GC-TOCIは87に達するなど処理に要する線量を著しく低減することができた。
ペレット密度測定法の相関関係柳澤 和章
JAERI-M 7158, 23 Pages, 1977/07
UOペレットの密度測定法には形状密度、水液浸密度、メタキシレン液浸密度法等がある。報告書ではこの3通りの測定法を仕様の同じ6種のUOペレットについて適用しその結果を統計的に処理して測定法の相関関係を求めた。その結果95%理論密度以上のペレットでは用いた測定法の間に1:1対応する直線的な相関関係が見い出されたが、95%理論密度以下のものに対してはUOペレット中の開気孔および閉気孔との相互作用があって相関が見いだせなかった。
加藤 潤; 谷口 拓海; 大杉 武史; 中澤 修; 曽根 智之; 黒木 亮一郎
no journal, ,
東京電力福島第一原子力発電所事故により発生した汚染水処理二次廃棄物は多種多様かつこれまでに処理実績のない性状を持つ。2017年度までに、放射性廃棄物処理に適用実績のある固化技術について、汚染水処理二次廃棄物に対する適用性評価に向けた課題が抽出された。本報告では、抽出された課題解決のための研究開発について紹介する。
