Pub Date : 2023-10-04DOI: 10.15255/cabeq.2023.2186
L. Liverić, Tamara Holjevac Grgurić, E. Govorčin Bajsić, Marko Kršulja
Shape memory alloys (SMAs) are smart materials with unique properties of super-elasticity and shape memory effect. These properties are the consequence of thermoelastic martensitic transformation, which can occur under thermal or mechanical deformation. Cu-Al-Ag alloys have high temperatures of martensite transformation, unlike other SMAs, which makes them suitable for use in specific applications. In this paper, Cu-10Al-1Ag alloy was prepared by melting pure metals in an electric arc furnace and casting the melt in a cylindrical mold. The microstructure of the as-cast and quenched material was determined by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy dispersive analysis (EDS). X-ray diffraction (XRD) analysis was performed to identify crystal phases in the microstructure, while transformation temperatures were determined by differential scanning calorimetry (DSC). The hardness of Cu-Al-Ag SMA was also determined with a microhardness tester. The results showed partially formed martensite in the as-cast state, and fully formed martensite structure, 18R-type, in the quenched Cu-10Al-1Ag alloy.
{"title":"Effect of Silver Addition on Cu-based Shape Memory Alloys","authors":"L. Liverić, Tamara Holjevac Grgurić, E. Govorčin Bajsić, Marko Kršulja","doi":"10.15255/cabeq.2023.2186","DOIUrl":"https://doi.org/10.15255/cabeq.2023.2186","url":null,"abstract":"Shape memory alloys (SMAs) are smart materials with unique properties of super-elasticity and shape memory effect. These properties are the consequence of thermoelastic martensitic transformation, which can occur under thermal or mechanical deformation. Cu-Al-Ag alloys have high temperatures of martensite transformation, unlike other SMAs, which makes them suitable for use in specific applications. In this paper, Cu-10Al-1Ag alloy was prepared by melting pure metals in an electric arc furnace and casting the melt in a cylindrical mold. The microstructure of the as-cast and quenched material was determined by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy dispersive analysis (EDS). X-ray diffraction (XRD) analysis was performed to identify crystal phases in the microstructure, while transformation temperatures were determined by differential scanning calorimetry (DSC). The hardness of Cu-Al-Ag SMA was also determined with a microhardness tester. The results showed partially formed martensite in the as-cast state, and fully formed martensite structure, 18R-type, in the quenched Cu-10Al-1Ag alloy.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135592214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-04DOI: 10.15255/cabeq.2023.2189
Filip Brleković, Katarina Mužina, Sanislav Kurajica
Cobalt blue is one of the world’s most famous blue pigments, but it presents a threat to human health since it is toxic when inhaled or ingested. A safer and environmentally preferable way of obtaining cobalt blue-like pigments is doping of various nontoxic compounds with small amounts of cobalt. In this work, doping of zinc silicate (willemite, Zn 2 SiO 4 ) was carried out with 5, 10, and 15 mol% of Co with the aim of obtaining Zn 2– x Co x SiO 4 solid solution. Thermal properties of sol-gel derived samples were examined with simultaneous differential thermal and thermogravimetric analysis (DTA/TGA), which showed dehydration, decomposition, and burning effects, accompanied with mass loss and willemite crystallization effect at 800 °C. X-ray powder diffraction analysis (XRD) indicated the formation of willemite phase at 800 °C, accompanied with ZnO phase and increase in willemite crystallinity with annealing temperature rise from 800 to 1100 °C. Fourier transform infrared spectroscopy (FTIR) showed characteristic bands for present oxides and their bonds along with adsorbed water and carbon dioxide. Coloura-tion of prepared samples changed with annealing temperature, whereas higher Co concentrations and temperatures accentuated the intense blue colour. Diffuse reflectance spectroscopy (DRS) revealed an increase in absorbance with annealing temperature and specific bands as a result of different Co coordination present in the samples. The 2D correlation analysis of FTIR and UV-Vis spectra of the samples thermally treated at various temperatures was utilized to investigate and correlate the changes in the structure with the rise of the annealing temperature. The obtained correlation facilitated the finding of optimal process parameters for the desired pigment quality
{"title":"Characterization of Sol-gel Derived Cobalt-doped Willemite via 2D Correlation Spectroscopy","authors":"Filip Brleković, Katarina Mužina, Sanislav Kurajica","doi":"10.15255/cabeq.2023.2189","DOIUrl":"https://doi.org/10.15255/cabeq.2023.2189","url":null,"abstract":"Cobalt blue is one of the world’s most famous blue pigments, but it presents a threat to human health since it is toxic when inhaled or ingested. A safer and environmentally preferable way of obtaining cobalt blue-like pigments is doping of various nontoxic compounds with small amounts of cobalt. In this work, doping of zinc silicate (willemite, Zn 2 SiO 4 ) was carried out with 5, 10, and 15 mol% of Co with the aim of obtaining Zn 2– x Co x SiO 4 solid solution. Thermal properties of sol-gel derived samples were examined with simultaneous differential thermal and thermogravimetric analysis (DTA/TGA), which showed dehydration, decomposition, and burning effects, accompanied with mass loss and willemite crystallization effect at 800 °C. X-ray powder diffraction analysis (XRD) indicated the formation of willemite phase at 800 °C, accompanied with ZnO phase and increase in willemite crystallinity with annealing temperature rise from 800 to 1100 °C. Fourier transform infrared spectroscopy (FTIR) showed characteristic bands for present oxides and their bonds along with adsorbed water and carbon dioxide. Coloura-tion of prepared samples changed with annealing temperature, whereas higher Co concentrations and temperatures accentuated the intense blue colour. Diffuse reflectance spectroscopy (DRS) revealed an increase in absorbance with annealing temperature and specific bands as a result of different Co coordination present in the samples. The 2D correlation analysis of FTIR and UV-Vis spectra of the samples thermally treated at various temperatures was utilized to investigate and correlate the changes in the structure with the rise of the annealing temperature. The obtained correlation facilitated the finding of optimal process parameters for the desired pigment quality","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135592714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2022.2152
S. Akiş, B. Inan, D. Özçimen
Today, microalgae have received considerable interest as an alternative feedstock for biofuel, animal feed, human food, and pharmaceuticals because they possess valuable oils and biomolecules. The main problem of the cost of microalgae production is generally associated with the harvesting process. Flocculation is an effective method to harvest microalgal biomass and minimize the operating cost. In this study, the effect of the chitosan solution, different pH conditions, and flocculation time on flocculation process of Chlorella minutissima and Nannochloropsis oculata were investigated, and the obtained data were evaluated statistically. Flocculation efficiency of C. minutissima and N. ocula ta were the highest under the conditions of 10 pH, 100 mg L –1 chitosan concentration, and flocculation time of 60 min, and found as 97 % and 85 %. It was also found that chitosan flocculation could be improved with pH increase. This study showed that chitosan is a favorable flocculant because of its high efficiency, being non-toxic, and en-abling the reusability of the growth medium after flocculation.
{"title":"Effect of Process Parameters on Chitosan-mediated Microalgae Flocculation","authors":"S. Akiş, B. Inan, D. Özçimen","doi":"10.15255/cabeq.2022.2152","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2152","url":null,"abstract":"Today, microalgae have received considerable interest as an alternative feedstock for biofuel, animal feed, human food, and pharmaceuticals because they possess valuable oils and biomolecules. The main problem of the cost of microalgae production is generally associated with the harvesting process. Flocculation is an effective method to harvest microalgal biomass and minimize the operating cost. In this study, the effect of the chitosan solution, different pH conditions, and flocculation time on flocculation process of Chlorella minutissima and Nannochloropsis oculata were investigated, and the obtained data were evaluated statistically. Flocculation efficiency of C. minutissima and N. ocula ta were the highest under the conditions of 10 pH, 100 mg L –1 chitosan concentration, and flocculation time of 60 min, and found as 97 % and 85 %. It was also found that chitosan flocculation could be improved with pH increase. This study showed that chitosan is a favorable flocculant because of its high efficiency, being non-toxic, and en-abling the reusability of the growth medium after flocculation.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45166028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2022.2157
A. Kovač Kralj
Conversion of waste into products and energy has the potential to reduce CO 2 emis - sion through implementation of a complete circular economy and utilisation of the hy - drogen effect technique. This study considers the novelties of the hydrogen effect tech - nique, which incorporates an upgraded input unit mathematical model. It includes real-simulated results obtained using an Aspen Plus ® simulator, and enlarged production. This technique is developed for optimal municipal solid waste (MSW) combustion, gas - ification, and reforming, presented as an upgraded input unit for syngas production, which can reduce CO 2 emissions by 3·10 6 kmol a –1 . This approach is exemplified by utilizing existing methanol and dimethyl ether production processes from natural gas, as they can be achieved and exceeded using MSW with varying hydrogen amounts. The optimal upgraded methanol and dimethyl ether production processes can increase pro - duction by 47 % and 16 %, including only the upgraded input unit, as well as decrease the temperature in the product reactors by 30 °C.
通过实施完整的循环经济和利用氢效应技术，将废物转化为产品和能源有可能减少二氧化碳的排放。本研究考虑了氢效应技术的新颖性，它包含了一个升级的输入单元数学模型。它包括使用Aspen Plus®模拟器获得的真实模拟结果，以及扩大的生产。该技术是针对城市生活垃圾(MSW)的最佳燃烧、气化和转化而开发的，作为合成气生产的升级投入单元，可以减少3·10.6 kmol a - 1的CO 2排放。该方法通过利用现有的天然气甲醇和二甲醚生产工艺来实现，因为它们可以通过使用含不同氢量的城市生活垃圾来实现和超越。优化后的甲醇和二甲醚生产工艺，仅包括升级后的输入装置，可使产量分别提高47%和16%，并使产物反应器温度降低30℃。
{"title":"Converting Waste into Products and Energy Using Complete Circular Economy and the Hydrogen Effect Technique to Reduce Dependence on Natural Gas","authors":"A. Kovač Kralj","doi":"10.15255/cabeq.2022.2157","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2157","url":null,"abstract":"Conversion of waste into products and energy has the potential to reduce CO 2 emis - sion through implementation of a complete circular economy and utilisation of the hy - drogen effect technique. This study considers the novelties of the hydrogen effect tech - nique, which incorporates an upgraded input unit mathematical model. It includes real-simulated results obtained using an Aspen Plus ® simulator, and enlarged production. This technique is developed for optimal municipal solid waste (MSW) combustion, gas - ification, and reforming, presented as an upgraded input unit for syngas production, which can reduce CO 2 emissions by 3·10 6 kmol a –1 . This approach is exemplified by utilizing existing methanol and dimethyl ether production processes from natural gas, as they can be achieved and exceeded using MSW with varying hydrogen amounts. The optimal upgraded methanol and dimethyl ether production processes can increase pro - duction by 47 % and 16 %, including only the upgraded input unit, as well as decrease the temperature in the product reactors by 30 °C.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46952828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2022.2174
N. Bashyal, S. Aryal, R. Rai, P. Lohani, S. K. Gautam, M. R. Pokhrel, B. R. Poudel
Removal of phosphate from wastewater is necessary for the safety of public health and environmental protection. The present study used an easily available and affordable biosorbent obtained from the pomegranate peel for the excision of phosphate from water. The biosorption behavior of raw pomegranate peel powder (RPGPP) was found negligible. The RPGPP was further saponified with Ca(OH) 2 followed by Fe(III) loading to obtain Fe(III)-loaded pomegranate peels (Fe(III)-PGPP), which was then employed for the phosphate uptake. Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to characterize the biosorbent. The batch adsorption test was used to evaluate the adsorption viability of biosorbents for removing phosphate from aqueous solution. Fe(III)-PGPP was determined to have a pH PZC of 5.40. The experimental data were best explained by the Langmuir isotherm and pseudo-second-order kinetic model. Fe(III)-PGPP had the largest phosphate biosorption capacity of 99.30 mg g –1 at the opti-mum pH of 3.0 and 2.5 hours of contact time. From the results obtained, Fe(III)-PGPP adsorbent can be regarded as an effective and cost-efficient material for the treatment of phosphate-anion-contaminated water.
{"title":"Effective Biosorption of Phosphate from Water Using Fe(III)-Loaded Pomegranate Peel","authors":"N. Bashyal, S. Aryal, R. Rai, P. Lohani, S. K. Gautam, M. R. Pokhrel, B. R. Poudel","doi":"10.15255/cabeq.2022.2174","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2174","url":null,"abstract":"Removal of phosphate from wastewater is necessary for the safety of public health and environmental protection. The present study used an easily available and affordable biosorbent obtained from the pomegranate peel for the excision of phosphate from water. The biosorption behavior of raw pomegranate peel powder (RPGPP) was found negligible. The RPGPP was further saponified with Ca(OH) 2 followed by Fe(III) loading to obtain Fe(III)-loaded pomegranate peels (Fe(III)-PGPP), which was then employed for the phosphate uptake. Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to characterize the biosorbent. The batch adsorption test was used to evaluate the adsorption viability of biosorbents for removing phosphate from aqueous solution. Fe(III)-PGPP was determined to have a pH PZC of 5.40. The experimental data were best explained by the Langmuir isotherm and pseudo-second-order kinetic model. Fe(III)-PGPP had the largest phosphate biosorption capacity of 99.30 mg g –1 at the opti-mum pH of 3.0 and 2.5 hours of contact time. From the results obtained, Fe(III)-PGPP adsorbent can be regarded as an effective and cost-efficient material for the treatment of phosphate-anion-contaminated water.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42462364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2023.2180
Ivana Martinović, G. Zlatić, Z. Pilić, M. Šušak, F. Falak
The cyclic voltammogram recorded in the potential range between 0 V and 800 mV with scan rate of 100 mV s −1 was used to determine the measure of antioxidants content (antioxidant capacity) present in Sambucus nigra L. extract. The antioxidant capacity of the extract was 4.06 mg GAE g −1 fw (mg of gallic acid equivalents per gram of fresh weight of the extract). The corrosion inhibition efficiency of Sambucus nigra L. extract on aluminium, copper, and bronze in 3 % NaCl solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. Polarization data showed that extract acted as a mixed-type inhibitor, that the corrosion inhibition process was spontaneous physical adsorption (Δ G ≈ –16 kJ mol –1 ) of the extract molecules on metals surfaces and followed Freundlich isotherm. Impedance spectroscopy studies revealed that increasing the concentration of extract reduced the double-layer capacitance and increased the charge transfer resistance. The highest inhibition efficiencies (Cu: ~ 57 %, CuSn14: ~74 % and Al: ~58 %) were achieved for an extract concentration of 1.0 g L –1 .
采用扫描速率为100 mV s−1，在0 V ~ 800 mV电位范围内记录的循环伏安图测定了黑参提取物中抗氧化剂含量(抗氧化能力)。提取物的抗氧化能力为4.06 mg GAE g−1 fw(每克鲜重提取物的没食子酸当量mg)。采用动电位极化法和电化学阻抗谱法研究了黑参提取物在3% NaCl溶液中对铝、铜和青铜的缓蚀效果。极化数据表明，萃取物为混合型缓蚀剂，其缓蚀过程为萃取物分子在金属表面的自然物理吸附(Δ G≈-16 kJ mol -1)，遵循Freundlich等温线。阻抗谱研究表明，提取物浓度的增加降低了双层电容，增加了电荷转移电阻。当萃取物浓度为1.0 g L -1时，Cu: ~ 57%， CuSn14: ~ 74%， Al: ~ 58%，抑制率最高。
{"title":"Antioxidant Capacity and Corrosion Inhibition Efficiency of Sambucus nigra L. Extract","authors":"Ivana Martinović, G. Zlatić, Z. Pilić, M. Šušak, F. Falak","doi":"10.15255/cabeq.2023.2180","DOIUrl":"https://doi.org/10.15255/cabeq.2023.2180","url":null,"abstract":"The cyclic voltammogram recorded in the potential range between 0 V and 800 mV with scan rate of 100 mV s −1 was used to determine the measure of antioxidants content (antioxidant capacity) present in Sambucus nigra L. extract. The antioxidant capacity of the extract was 4.06 mg GAE g −1 fw (mg of gallic acid equivalents per gram of fresh weight of the extract). The corrosion inhibition efficiency of Sambucus nigra L. extract on aluminium, copper, and bronze in 3 % NaCl solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. Polarization data showed that extract acted as a mixed-type inhibitor, that the corrosion inhibition process was spontaneous physical adsorption (Δ G ≈ –16 kJ mol –1 ) of the extract molecules on metals surfaces and followed Freundlich isotherm. Impedance spectroscopy studies revealed that increasing the concentration of extract reduced the double-layer capacitance and increased the charge transfer resistance. The highest inhibition efficiencies (Cu: ~ 57 %, CuSn14: ~74 % and Al: ~58 %) were achieved for an extract concentration of 1.0 g L –1 .","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43584087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2023.2201
M. Nouri, Shahla Shahriari, Pegah Nabi, G. Pazuki
Vanillin, widely utilized in the food, medicinal, and pharmaceutical industries, re-quires an improved extraction process that is cost-effective and environmentally friendly to meet the growing industrial demand. To tackle this challenge, we conducted an inves-tigation on a nanoparticle-based aqueous two-phase system (ATPS), incorporating polyethylene glycol (PEG) and dextran (DEX). The primary objective was to develop an ATPS that is non-alkaline, operates under mild environmental conditions, and is both non-toxic and cost-effective. The study focused on identifying a suitable nanoparticle that could improve the partitioning of vanillin in ATPS and facilitate economically favorable separation processes. Various nanoparticles were evaluated as additives to enhance vanillin partitioning. The study explores the influence of parameters, such as polymer weight percentages and DEX molecular weight on vanillin partitioning and recovery percentage. Additionally, the impact of incorporating different nanoparticles was assessed in the optimized system composed of 6.5 wt% PEG6000 and 7.8 wt% DEX15000. Results indicate that the addition of only 0.001 g of silver nanoparticles to the optimal system improved the partition coefficient by 42 % and the vanillin recovery percentage by ap-proximately 8 %
{"title":"Enhancement of Vanillin Partitioning and Recovery in Nanoparticle-based Aqueous Two-phase System Containing PEG and Dextran Polymers","authors":"M. Nouri, Shahla Shahriari, Pegah Nabi, G. Pazuki","doi":"10.15255/cabeq.2023.2201","DOIUrl":"https://doi.org/10.15255/cabeq.2023.2201","url":null,"abstract":"Vanillin, widely utilized in the food, medicinal, and pharmaceutical industries, re-quires an improved extraction process that is cost-effective and environmentally friendly to meet the growing industrial demand. To tackle this challenge, we conducted an inves-tigation on a nanoparticle-based aqueous two-phase system (ATPS), incorporating polyethylene glycol (PEG) and dextran (DEX). The primary objective was to develop an ATPS that is non-alkaline, operates under mild environmental conditions, and is both non-toxic and cost-effective. The study focused on identifying a suitable nanoparticle that could improve the partitioning of vanillin in ATPS and facilitate economically favorable separation processes. Various nanoparticles were evaluated as additives to enhance vanillin partitioning. The study explores the influence of parameters, such as polymer weight percentages and DEX molecular weight on vanillin partitioning and recovery percentage. Additionally, the impact of incorporating different nanoparticles was assessed in the optimized system composed of 6.5 wt% PEG6000 and 7.8 wt% DEX15000. Results indicate that the addition of only 0.001 g of silver nanoparticles to the optimal system improved the partition coefficient by 42 % and the vanillin recovery percentage by ap-proximately 8 %","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49396060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.15255/cabeq.2023.2177
Wen Zhang, Y. Lu, M. Wang
Lignin-containing wastewater treatment by different microbial consortia were studied in this research. The special microbial consortia (J-6 and J-1) obtained from decayed wooden relics were selected. The bacteria of original microbial consortium J-6 mainly included Shinella , Cupriavidus and Bosea . The bacteria of original microbial consortium J-1 mainly included Serratia and Yersinia . The fungi of J-6 and J-1 were dominated by Saccharomycetales. The performances of two microbial consortia in wastewater treatment were compared, and the changes in community structure were analyzed to study the relationship between microbial consortium structure and degradation efficiency. For the treatment of model Chinese medicine wastewater, the optimal degradation conditions were treatment temperature of 30 °C, initial pH of 7, dissolved oxygen of 2 mg L –1 , and treatment time of 96 h. The COD (Chemical Oxygen Demand) removal efficiency reached 95.25 % by J-1. For the treatment of model papermaking wastewater, the optimal degradation conditions were treatment temperature of 30 °C, pH of 5, dissolved oxygen of 3 mg L –1 , nitrogen source concentration of 0.1 g L –1 , and treatment time of 120 h. The COD removal efficiency reached 86.8 % by J-6. Bacteria played a significant role in the degradation of lignin-containing wastewater, and the bacterial consortium abundance may promote the degradation of organic substances in the wastewater. The dominant strains were different in Chinese medicine wastewater and paper-making wastewater systems. The correlation between microorganisms and the difference in the abundance of bacteria groups may be the reason for the different performances of the two microbial consortia in treating different lignin-containing wastewaters.
研究了不同菌群对含木质素废水的处理效果。从腐烂的木质文物中获得特殊的微生物群落(J-6和J-1)。J-6原菌群细菌主要有Shinella、Cupriavidus和Bosea。病原菌J-1主要为沙雷氏菌和耶尔森氏菌。J-6和J-1真菌以saccharomycetale为主。比较了两种微生物群落在污水处理中的表现，分析了群落结构的变化，研究了微生物群落结构与降解效率的关系。对于模型中药废水，最佳降解条件为处理温度为30℃，初始pH为7，溶解氧为2 mg L -1，处理时间为96 h, J-1对COD(化学需氧量)的去除率达到95.25%。对于模型造纸废水，最佳降解条件为处理温度30℃、pH 5、溶解氧3 mg L -1、氮源浓度0.1 g L -1、处理时间120 h, J-6对COD的去除率达到86.8%。细菌在含木质素废水的降解中发挥了重要作用，菌群丰度可以促进废水中有机物的降解。在中药废水和造纸废水系统中，优势菌群存在差异。微生物之间的相关性和菌群丰度的差异可能是两种微生物群落在处理不同含木质素废水时表现不同的原因。
{"title":"Comparison of Degradation of Lignin-containing Wastewaters in the Presence of Different Microbial Consortia","authors":"Wen Zhang, Y. Lu, M. Wang","doi":"10.15255/cabeq.2023.2177","DOIUrl":"https://doi.org/10.15255/cabeq.2023.2177","url":null,"abstract":"Lignin-containing wastewater treatment by different microbial consortia were studied in this research. The special microbial consortia (J-6 and J-1) obtained from decayed wooden relics were selected. The bacteria of original microbial consortium J-6 mainly included Shinella , Cupriavidus and Bosea . The bacteria of original microbial consortium J-1 mainly included Serratia and Yersinia . The fungi of J-6 and J-1 were dominated by Saccharomycetales. The performances of two microbial consortia in wastewater treatment were compared, and the changes in community structure were analyzed to study the relationship between microbial consortium structure and degradation efficiency. For the treatment of model Chinese medicine wastewater, the optimal degradation conditions were treatment temperature of 30 °C, initial pH of 7, dissolved oxygen of 2 mg L –1 , and treatment time of 96 h. The COD (Chemical Oxygen Demand) removal efficiency reached 95.25 % by J-1. For the treatment of model papermaking wastewater, the optimal degradation conditions were treatment temperature of 30 °C, pH of 5, dissolved oxygen of 3 mg L –1 , nitrogen source concentration of 0.1 g L –1 , and treatment time of 120 h. The COD removal efficiency reached 86.8 % by J-6. Bacteria played a significant role in the degradation of lignin-containing wastewater, and the bacterial consortium abundance may promote the degradation of organic substances in the wastewater. The dominant strains were different in Chinese medicine wastewater and paper-making wastewater systems. The correlation between microorganisms and the difference in the abundance of bacteria groups may be the reason for the different performances of the two microbial consortia in treating different lignin-containing wastewaters.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67064166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-09DOI: 10.15255/cabeq.2022.2165
Amina Ben Bouabdallah, Fadia Mazari, Roumeissa Sifi
The aim of the present study was to assess the adsorption potential of a natural adsorbent Oxalis pes-caprae L. for the removal of azo-dye solophenyl red 3BL (SR 3BL) from textile effluents. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effect of various parameters on the efficiency of the adsorption was studied. The optimum was found with the contact time of 35 minutes, pH of 6, and temperature of 25 °C. The equilibrium experimental data were fitted with the Langmuir, Freundlich, and Temkin models. Experimental data were well described with the Langmuir isotherm indicating monolayer adsorption. Pseudo-first-order, pseudo-second-order, and Elovich kinetic models were used to evaluate the adsorption kinetics. The adsorption kinetics was found to follow closely the pseudo-first-order kinetic model. Thermodynamics studies revealed that the adsorption process was spontaneous and exothermic.
本研究的目的是评估天然吸附剂草叶草(Oxalis pe -caprae L.)对纺织废水中偶氮染料索苯基红3BL (SR 3BL)的吸附潜力。采用傅里叶变换红外光谱(FTIR)和扫描电镜(SEM)对吸附剂进行了表征。研究了各参数对吸附效率的影响。在接触时间为35 min、pH为6、温度为25℃的条件下，获得了最佳效果。平衡实验数据用Langmuir、Freundlich和Temkin模型拟合。实验数据与Langmuir等温线一致，表明单层吸附。采用拟一级、拟二级和Elovich动力学模型对吸附动力学进行了评价。吸附动力学符合准一级动力学模型。热力学研究表明，吸附过程是自发的、放热的。
{"title":"Removal of Solophenyl Red 3BL Dye from Textile Effluents by Adsorption Using a Natural Adsorbent Oxalis pes-caprae L.","authors":"Amina Ben Bouabdallah, Fadia Mazari, Roumeissa Sifi","doi":"10.15255/cabeq.2022.2165","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2165","url":null,"abstract":"The aim of the present study was to assess the adsorption potential of a natural adsorbent Oxalis pes-caprae L. for the removal of azo-dye solophenyl red 3BL (SR 3BL) from textile effluents. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effect of various parameters on the efficiency of the adsorption was studied. The optimum was found with the contact time of 35 minutes, pH of 6, and temperature of 25 °C. The equilibrium experimental data were fitted with the Langmuir, Freundlich, and Temkin models. Experimental data were well described with the Langmuir isotherm indicating monolayer adsorption. Pseudo-first-order, pseudo-second-order, and Elovich kinetic models were used to evaluate the adsorption kinetics. The adsorption kinetics was found to follow closely the pseudo-first-order kinetic model. Thermodynamics studies revealed that the adsorption process was spontaneous and exothermic.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43799149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-09DOI: 10.15255/cabeq.2022.2048
E. Emori, M. Ravagnani, C. Costa
The sugarcane crushing stage is one of the most important technologies being developed at the moment. In this paper, the control of the multiple-stage evaporation system was addressed, as it is a crucial stage in the first- and second-generation ethanol production from sugarcane. A neural network model was proposed based on a dynamic phenomenological model developed in EMSO (Environment for Modeling, Simulation and Optimization). The phenomenological model was used to build a neural network prediction model for an MPC (Model Predictive Control) scheme using a DMC (Dynamic Matrix Control) algorithm. Simulations were carried out to evaluate the performance for tracking the set-point. Also, disturbance rejection tests were performed, considering different step disturbances. The analysis demonstrated that the MPC scheme performed well in the tests and showed superiority when compared to classical PID controllers.
甘蔗破碎阶段是目前正在开发的重要技术之一。多级蒸发系统是甘蔗第一代和第二代乙醇生产的关键环节，本文对多级蒸发系统的控制进行了研究。基于EMSO (Environment for Modeling, Simulation and Optimization)中建立的动态现象学模型，提出了一种神经网络模型。利用现象学模型建立了基于动态矩阵控制(DMC)算法的模型预测控制(MPC)方案的神经网络预测模型。通过仿真来评价该算法跟踪设定值的性能。此外，还进行了考虑不同阶跃扰动的抗干扰试验。分析表明，MPC方案在测试中表现良好，与传统PID控制器相比具有优越性。
{"title":"An Advanced Control Strategy for the Evaporation Section of An Integrated First- and Second-Generation Ethanol Sugarcane Biorefinery","authors":"E. Emori, M. Ravagnani, C. Costa","doi":"10.15255/cabeq.2022.2048","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2048","url":null,"abstract":"The sugarcane crushing stage is one of the most important technologies being developed at the moment. In this paper, the control of the multiple-stage evaporation system was addressed, as it is a crucial stage in the first- and second-generation ethanol production from sugarcane. A neural network model was proposed based on a dynamic phenomenological model developed in EMSO (Environment for Modeling, Simulation and Optimization). The phenomenological model was used to build a neural network prediction model for an MPC (Model Predictive Control) scheme using a DMC (Dynamic Matrix Control) algorithm. Simulations were carried out to evaluate the performance for tracking the set-point. Also, disturbance rejection tests were performed, considering different step disturbances. The analysis demonstrated that the MPC scheme performed well in the tests and showed superiority when compared to classical PID controllers.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46307321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：