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    Tytuł:
    A preliminary investigation of dry gravity separation with low specific gravity ores using a laboratory Knelson Concentrator
    Autorzy:
    Zhou, Meng
    Kökkılıç, Ozan
    Langlois, Raymond
    Waters, Kristian E.
    Powiązania:
    https://bibliotekanauki.pl/articles/24085570.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Knelson concentrator
    dry gravity separation
    response surface method
    Box-Behnken design
    Opis:
    It has become an active research area for treating low specific gravity (SG) deposits by centrifugal separation due to its high efficiency, low cost and minor environmental impact. Laboratory Knelson Concentrator has shown its potential for processing high density ores on a dry basis. This study investigated the feasibility and the optimum operating conditions when processing a dry low SG feed with a modified Knelson Concentrator. A synthetic mixture of magnetite and quartz with a grade of 1% magnetite was used to mimic a low-density ratio ore. Bowl speed (G), air fluidizing pressure (psi) and solids feed rate (g/min) were chosen as the operating variables. Box-Behnken design was used to design the experiments and response surface method was used for optimization. The effects of each individual factors and their interactions on concentrate grade and magnetite recovery were evaluated. The dry process achieved up to 60 % magnetite recovery with an upgrade ratio of 5. The optimized values for the concentration with the highest recovery and grade of bowl speed, solids feed rate and air fluidizing pressure are 27 G, 200 g/min and 12 psi, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 165992
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of culture conditions for flexirubin production by Chryseobacterium artocarpi CECT 8497 using response surface methodology
    Autorzy:
    Venil, Chidambaram
    Zakaria, Zainul
    Ahmad, Wan
    Powiązania:
    https://bibliotekanauki.pl/articles/1039086.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Chryseobacterium artocarpi CECT 8497
    yellowish-orange pigment
    medium optimization
    Box-Behnken Design
    bioreactor
    Opis:
    Flexirubins are the unique type of bacterial pigments produced by the bacteria from the genus Chryseobacterium, which are used in the treatment of chronic skin disease, eczema etc. and may serve as a chemotaxonomic marker. Chryseobacterium artocarpi CECT 8497, an yellowish-orange pigment producing strain was investigated for maximum production of pigment by optimizing medium composition employing response surface methodology (RSM). Culture conditions affecting pigment production were optimized statistically in shake flask experiments. Lactose, l-tryptophan and KH2PO4 were the most significant variables affecting pigment production. Box Behnken design (BBD) and RSM analysis were adopted to investigate the interactions between variables and determine the optimal values for maximum pigment production. Evaluation of the experimental results signified that the optimum conditions for maximum production of pigment (521.64 mg/L) in 50 L bioreactor were lactose 11.25 g/L, l-tryptophan 6 g/L and KH2PO4 650 ppm. Production under optimized conditions increased to 7.23 fold comparing to its production prior to optimization. Results of this study showed that statistical optimization of medium composition and their interaction effects enable short listing of the significant factors influencing maximum pigment production from Chryseobacterium artocarpi CECT 8497. In addition, this is the first report optimizing the process parameters for flexirubin type pigment production from Chryseobacterium artocarpi CECT 8497.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 2; 185-190
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance evaluation of chemical coagulation process to treat bagasse wastewater : modeling and optimization
    Autorzy:
    Thirugnanasambandham, K.
    Sivakumar, V.
    Shine, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779435.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    bagasse wastewater
    chemical coagulation, ferric chloride
    Box-Behnken design
    sludge
    operation
    cost
    optimization
    Opis:
    In this present study, chemical coagulation process (CC) treatment process was investigated under different conditions such as pH, ferric chloride dose, agitation time and settling time to treat bagasse wastewater using response surface methodology (RSM). The outcomes were evaluated using Pareto analysis of variance (ANOVA) and second order polynomial models were created with the aim of being able to predict the responses. Ideal conditions were observed to be as per the following: agitation time of 25 min, pH of 7, ferric chloride dose of 6 g/L and settling time of 60 min. Under these conditions, turbidity removal of 62%, COD removal of 67%, TDS removal 53% and sludge production of 32 mL/L were obtained with operating cost of 3.50 Rupee/L. The mechanism of CC was analyzed using XRD spectrum and founds to be adsorption.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 1; 99-104
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Copper Removal by Photovoltaic Electrocoagulation from Aqueous Solution Using Response Surface Methodology Towards Sustainable Development
    Autorzy:
    Thanh, Hoa Nguyen
    Nguyen, Lien
    Lan, Phuong Dinh Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/123109.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    photovoltaics
    electrocoagulation
    copper
    Box-Behnken design
    energy consumption
    lithium battery
    sustainable development
    Opis:
    This research aims at illustrating the optimal functions of removing copper ions in aqueous solution by means of the electrocoagulation process in which portable solar power generators are used as renewable energy. A solar photovoltaic cell (PV), producing approximately 48A current intensity for 4-7 h per day, was sufficient to charge the lithium batteries completely during the day. This system was connected directly to the electrocoagulation tank. The Box-Behnken design (BBD) was applied to evaluate three effects of process factors: current density, the dose of electrolyte (NaCl), and application time. The results showed that an optimal efficiency of 99.01% Cu removal plus an energy savings of 1.039 kWh/m3 were obtained at a current density of 4 A/m2, the dosage of NaCl (electrolyte) of 1.87 g/L, and electrolysis time of 10 min. The chemical components of the sludge produced under these optimized conditions were determined by means of EDX. It was illustrated that the copper ions were the main elements of sludge, and nonhazardous compounds were contained. The PV-lithium battery system is considered to be an efficient alternative energy source toward sustainable development.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 7; 103-111
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction and optimization of Mucuna pruriens for dyeing of leather
    Autorzy:
    Sundari, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/779092.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    leaching
    Mucuna pruriens
    extraction
    Box-Behnken design
    dyeing of leather
    Opis:
    The present study reports on the leaching of natural pigment from Mucuna pruriens for dyeing of chrome tanned leather samples. The experiments were performed at temperature (30-70°C), time (30-90 min), feed to solvent ratio (1:3-1:7) and particle size (0.25-0.75 mm) using ethanol as solvent. The influence of process variables on percentage yield has been studied and the conditions were optimized using Box-Behnken design. The optimized conditions for intensified extraction was found to occur at a temperature of 60°C, extraction time of 1 hr, for a feed to solvent ratio of 1:5 and 0.75 mm particle size. The % yield under optimized conditions was found to be 47%. The extraction results were found to agree well with the statistical model (R2 = 0.9740). The colouring ability of extracted dye has been tested on wet blue goat leathers. The dyed leather exhibited a better colour value, strength and fastness properties as inferred from reflectance and visual assessment tests.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 57-63
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie składu polepszacza glebowego na bazie bazaltu, biowęgla i otrąb owsianych na plon pszenicy jarej
    Establishing the composition of the soil improver on the basis of basalt, biocarbon and oat breast for spring wheat crop
    Autorzy:
    Sobolczyk-Bednarek, Justyna
    Choińska-Pulit, Anna
    Łaba, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2175622.pdf
    Data publikacji:
    2021
    Wydawca:
    Poltegor-Instytut Instytut Górnictwa Odkrywkowego
    Tematy:
    bazalt
    biowęgiel
    otręby pszenne
    plan Boxa-Behnkena
    basalt
    biochar
    wheat bran
    Box-Behnken design
    Opis:
    Praca obejmuje opracowanie różnych wariantów mieszanek polepszacza glebowego i testowania go w glebie, w celu poprawy plonu pszenicy jarej. W badaniach wykorzystano 3-czynnikowy układ doświadczalny według Boxa-Behnkena, w celu modelowania wpływu składników takich jak: biowęgiel, bazalt, otręby pszenne na parametry wzrostu roślin w glebie uniwersalnej. Możliwość zastosowania powyższych składników została potwierdzona poprzez wykonaną wcześniej analizę wieloelementową. Prace badawcze polegały na monitorowaniu tempa wzrostu roślin, badania składu gleby po zakończeniu eksperymentu oraz suchej i mokrej masy roślin po zakończeniu doświadczenia. Badania potwierdziły zasadność stosowania dodatków do gleb, szczególnie jeśli chodzi o otręby pszenne i biowęgiel. Dodatek polepszacza nie wpłynął na zwiększenie zawartości metali ciężkich, co wskazuje na możliwości jego wykorzystania.
    The work includes the development of various variants of soil improver mixtures and testing them in soil to improve the yield of spring wheat. The study used a 3-factor experimental system according to Box-Behnken in order to model the influence of components such as: biochar, basalt, wheat bran on plant growth parameters in a substrate based on universal soil. The applicability of the above ingredients has been confirmed by a multi-element analysis performed earlier. The research work consisted in monitoring the plant growth rate, examining the soil composition after the end of the experiment, and the dry and wet mass of plants after the end of the experiment. The research confirmed the legitimacy of the use of soil additives, especially when it comes to wheat bran and biochar. The addition of an improver did not increase the content of heavy metals, which indicates the possibility of their use.
    Źródło:
    Górnictwo Odkrywkowe; 2021, 62, 4; 17--27
    0043-2075
    Pojawia się w:
    Górnictwo Odkrywkowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of vanadium and tungsten from spent selective catalytic reduction catalyst by alkaline pressure leaching
    Autorzy:
    Liu, Nana
    Xu, Xinyang
    Liu, Yuan
    Powiązania:
    https://bibliotekanauki.pl/articles/110694.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spent SCR catalyst
    alkaline pressure leaching
    response surface method
    Box-Behnken design
    Opis:
    Improving the efficiency of precious metal recovery from spent Selective Catalytic Reduction (SCR) catalyst provides economic benefits and promises sustainable use of resources. Here we demonstrate highly efficient alkaline pressure leaching method for the extraction of vanadium (V) and tungsten (W) from spent SCR catalyst. We analyzed the effects of experimental parameters such as the stirring speed, leaching agent concentration, leaching temperature, liquid-to-solid ratio, and leaching time. The Box-Behnken design of experiments and the response surface methodology have been employed to understand the impact of the leaching parameters and the impact of their interactions on the leaching rate of V and W. The results showed that the leaching agent concentration significantly promoted the recovery of V and W; the influence of the reaction temperature and leaching time moderately increased the leaching rate of the metals. Moreover, the efficiency of the alkaline pressure leaching technique was determined by the interactions between leaching time and reaction temperature, and the relationships between reaction temperature and leaching agent concentration. By using the response surface methodology, the optimal leaching conditions were found that the leaching agent concentration was 4.75 molL-1, the leaching temperature was 190 °C, and the reaction time was 44.5 min, and the predicted values of V and W leaching rates were 95.76% and 98.36%, respectively. Based on the excellent fitting between modeling and experimental results demonstrated in this work, we conclude that our study can shed light on the development of highly efficient and sustainable metal recovery strategies for practical applications.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 3; 407-420
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer by endophytic Bacillus cereus RCL 02 utilizing sugarcane molasses as sole source of carbon: a statistical optimization approach
    Autorzy:
    Das, Rituparna
    Pal, Arundhati
    Paul, Amal K.
    Powiązania:
    https://bibliotekanauki.pl/articles/16648137.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    PHA copolymer
    sugarcane molasses
    Bacillus cereus
    process optimization
    response surface methodology
    Box-Behnken design
    Opis:
    Polymers of biological origin have become a topic of interest due to growing concerns about the environmental impact of the disposal of plastics. In recent years, the production of ecobenign microbial polymer polyhydroxyalkanoates (PHAs) using inexpensive and renewable resources has gained significant interest as these compounds are highly biodegradable, biocompatible, and sustainable. This study used leaf endophytic isolate Bacillus cereus RCL 02, obtained from the oil-yielding plant Ricinus communis L., to achieve statistical optimization of culture variables for the enhanced production of PHAs utilizing sugarcane molasses as the sole carbon source. A threelevel and four-factor Box–Behnken design of response surface methodology was implemented to optimize the process variables, namely molasses (carbon substrate), ammonium sulfate (nitrogen source), initial pH, and incubation period, for improved biomass formation and PHA production. The highest growth (14.8 g/l) and PHA production (85.2%, dry cell weight) by the isolate were observed with 47 g/l molasses, 3 g/l ammonium sulfate, an initial pH of 6.7, and 62 h of incubation. Statistical optimization of the process allowed achieving a 1.6-fold increase in the PHA yield (7.8–12.6 g/l) compared with the conventional single-factor system of analysis. The biopolymer thus produced was confirmed as a copolymer of 3 hydroxybutyrate and 3-hydroxyvalerate [P(3HB-co3HV)] using 1 H nuclear magnetic resonance spectroscopic analysis and was found to contain 7.8 mol% 3 hydroxyvalerate. These findings clearly indicate the efficacy of the B. cereus RCL 02 isolate in the biotransformation of raw sugarcane molasses to P(3HV-co-3HV), without the need for supplementation with high-cost precursors.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 3; 283-300
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enzymatic bioconversion of feather waste with keratinases of Bacillus cereus PCM 2849
    Autorzy:
    Ciurko, Dominika P.
    Łaba, Wojciech
    Piegza, Michał
    Juszczyk, Piotr
    Choińska-Pulit, Anna
    Sobolczyk-Bednarek, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/778229.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    feather waste
    Bacillus cereus
    Box-Behnken design
    hydrolysis
    thermo-chemical pretreatment
    Opis:
    Enzymatic preparation from culture of keratinolytic Bacillus cereus PCM 2849 was applied for hydrolysis of whole chicken feathers, after sulphitolytic pretreatment. This process was optimized using a three-factor Box-Behnken design, where the effect of substrate concentration, sulphite concentration during pretreatment and reaction temperature was evaluated on the release of amino acids. Obtained results revealed the highest impact of reaction temperature, followed by substrate content and sulphite during pretreatment. Optimal process conditions were established, i.e. temperature 44.4°C, feathers 4.7% and treatment with 25.3 mM sulphite. Amino acid composition of the obtained hydrolysate was analyzed. Glutamic acid (9.21 g·kg−1) and proline were dominant, however significant amount of branched-chain amino acids was also observed. The FTIR analysis of residual substrate revealed the cleavage of disulphide bonds in keratin through the presence of thioester residues. The absence of reduced cysteine residues was confirmed, along with minor changes in proportions of keratin substructures.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 3; 53-59
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Box-Behnken design optimization of microwave treatment of sulphidic gold flotation tailing
    Autorzy:
    Benli, Birgül
    Baştürkçü, Hüseyin
    Powiązania:
    https://bibliotekanauki.pl/articles/2146937.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microwave heating
    gold-bearing high sulfide concentrate
    bulk flotation
    optimization
    Box-Behnken experimental design
    Opis:
    As raw minerals become scarcer every passing day, the need for the recovery of mine tailings becomes essential. This research highlights the use of microwave energy as a green alternative to otherwise environmentally harmful methods of ore tailing recovery. The obtained results indicate that a 1.4 ppm Au and 3.5 % S sample floated with Aeroflot 208 and Aerophine 3418A increased the concentration of tailings over 18 % S and 4 ppm, Au, for recovery yield, resulting in 84 % and 80 % recovery, respectively. After microwave irradiation, 90 % of sulphur removal was reached under the optimum conditions of 50 minutes of irradiation using 1000 W for 4 g of the sample. Overall with 96. 74 % correlation of the quadratic model using the Box-Behnken design and expressed coefficient R2 regression the model was proven to be suitable for heating and roasting processes of gold-bearing tailings.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 149929
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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