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":"1 1","pages":""},"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 : 2023-07-03DOI: 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":" ","pages":""},"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 : 2023-04-09DOI: 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":" ","pages":""},"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":" ","pages":""},"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}
Pub Date : 2023-04-09DOI: 10.15255/cabeq.2022.2108
Rakesh Swain, Souvik Nandi, Pallavi Bardhan, S. S. Swain, S. Mohapatra, S. Mallick
To overcome low oral bioavailability and short biological half-life, improved and sustained buccal delivery of valsartan has been proposed. Valsartan film with colloidal silicon dioxide has been prepared using HPMC as mucoadhesive polymer matrix by casting and solvent evaporation method. Valsartan and Aerosil might have been interacted by hydrogen bond formation between adsorbed water and silanol of SiO 2 . In vitro drug release and ex vivo buccal permeation increased with the increase of Aerosil in the film. The formulation of valsartan to Aerosil at 1:0.02 ratio exhibited a sustained type of release and permeation of 80 and 70 %, respectively, in 8 h of study in simulated physiological fluid (pH 6.8). Molecular docking study revealed a stable configuration with favourable score of –2.15 kcal mol –1 of the Aerosil incorporated valsartan buccal film. In conclusion, Aerosil incorporated hydrogel forming buccal film could be used for improved and sustained delivery of valsartan.
{"title":"Aerosil in Solid-state Buccal Film for Improved and Sustained Delivery of Valsartan: Molecular Docking Studies","authors":"Rakesh Swain, Souvik Nandi, Pallavi Bardhan, S. S. Swain, S. Mohapatra, S. Mallick","doi":"10.15255/cabeq.2022.2108","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2108","url":null,"abstract":"To overcome low oral bioavailability and short biological half-life, improved and sustained buccal delivery of valsartan has been proposed. Valsartan film with colloidal silicon dioxide has been prepared using HPMC as mucoadhesive polymer matrix by casting and solvent evaporation method. Valsartan and Aerosil might have been interacted by hydrogen bond formation between adsorbed water and silanol of SiO 2 . In vitro drug release and ex vivo buccal permeation increased with the increase of Aerosil in the film. The formulation of valsartan to Aerosil at 1:0.02 ratio exhibited a sustained type of release and permeation of 80 and 70 %, respectively, in 8 h of study in simulated physiological fluid (pH 6.8). Molecular docking study revealed a stable configuration with favourable score of –2.15 kcal mol –1 of the Aerosil incorporated valsartan buccal film. In conclusion, Aerosil incorporated hydrogel forming buccal film could be used for improved and sustained delivery of valsartan.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42502934","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.2022.2071
Ouassam Hartal, Chaymae Haddaji, A. Anouzla, A. Madinzi, S. Souabi
The spectacular evolution of the urban and industrial sector today poses real environmental challenges of water pollution that requires immediate attention. Surfactants are emerging contaminants that pose a significant problem in wastewater treatment, and their presence causes difficulty in traditional treatment processes. In this context, the present work critically reviews the impacts of surfactants and their toxicity on the environment and human health while presenting the various techniques used in wastewater treatment plants to reduce their effects. Surfactants are removed from wastewater using different techniques, including physical, chemical, biological, and membrane treatment. The choice of the most appropriate technique for wastewater treatment is based on many criteria, such as effluent quality, standards to be respected, investment and operating costs, and environmental footprint. Adsorption and coagulation-flocculation are the most suitable techniques for removing detergents from wastewater due to their effectiveness, ease of use, environmental friendliness, and cost-effectiveness.
{"title":"Recent Advances in Physicochemical and Biological Techniques for the Management of Discharges Loaded with Surfactants","authors":"Ouassam Hartal, Chaymae Haddaji, A. Anouzla, A. Madinzi, S. Souabi","doi":"10.15255/cabeq.2022.2071","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2071","url":null,"abstract":"The spectacular evolution of the urban and industrial sector today poses real environmental challenges of water pollution that requires immediate attention. Surfactants are emerging contaminants that pose a significant problem in wastewater treatment, and their presence causes difficulty in traditional treatment processes. In this context, the present work critically reviews the impacts of surfactants and their toxicity on the environment and human health while presenting the various techniques used in wastewater treatment plants to reduce their effects. Surfactants are removed from wastewater using different techniques, including physical, chemical, biological, and membrane treatment. The choice of the most appropriate technique for wastewater treatment is based on many criteria, such as effluent quality, standards to be respected, investment and operating costs, and environmental footprint. Adsorption and coagulation-flocculation are the most suitable techniques for removing detergents from wastewater due to their effectiveness, ease of use, environmental friendliness, and cost-effectiveness.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49093269","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 : 2023-02-14DOI: 10.15255/cabeq.2022.2119
Giulia Staltari, Alice Biasin, L. Grassi, F. Gerin, M. Maschio, M. Confalonieri, G. Grassi, M. Grassi, M. Abrami
The shear modulus G of the sputum obtained by expectoration from cystic fibrosis patients is fundamental to determine the mesh size of the polymeric network pervading the sputum, a parameter related to lung functionality. The Akaike criterion revealed that in 55.2 % of the examined samples, the best approach (among those considered) to determine G relied on the mechanical spectrum fitting by the generalised Maxwell model with relaxation times scaled by a factor 10. Thus, this approach was adopted to evaluate the mesh size distribution combining G knowledge with the determination of the average magnetic relaxation time ( T 2m ) of sputum. As G and T 2m determination can be negatively affected by sputum contamination by saliva, whose presence increases T 2m and depresses G , we developed a proper “decontamination” procedure to obtain more reliable T 2m and G estimations (necessary in 21 % of the samples). This procedure allowed to strengthen the T 2m correlation with lung functionality evaluated by FEV 1 (normalised air volume emitted in the first second during a spirometry test)
{"title":"Rheological and Low Field NMR Characterisation of Cystic Fibrosis Patient’s Sputum","authors":"Giulia Staltari, Alice Biasin, L. Grassi, F. Gerin, M. Maschio, M. Confalonieri, G. Grassi, M. Grassi, M. Abrami","doi":"10.15255/cabeq.2022.2119","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2119","url":null,"abstract":"The shear modulus G of the sputum obtained by expectoration from cystic fibrosis patients is fundamental to determine the mesh size of the polymeric network pervading the sputum, a parameter related to lung functionality. The Akaike criterion revealed that in 55.2 % of the examined samples, the best approach (among those considered) to determine G relied on the mechanical spectrum fitting by the generalised Maxwell model with relaxation times scaled by a factor 10. Thus, this approach was adopted to evaluate the mesh size distribution combining G knowledge with the determination of the average magnetic relaxation time ( T 2m ) of sputum. As G and T 2m determination can be negatively affected by sputum contamination by saliva, whose presence increases T 2m and depresses G , we developed a proper “decontamination” procedure to obtain more reliable T 2m and G estimations (necessary in 21 % of the samples). This procedure allowed to strengthen the T 2m correlation with lung functionality evaluated by FEV 1 (normalised air volume emitted in the first second during a spirometry test)","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44890585","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 : 2023-02-14DOI: 10.15255/cabeq.2022.2124
M. Koller, A. Mukherjee
Achieving circularity in materials requires fundamental changes in the polymers we use today and the way they are produced. Functional polymeric materials from renewable feedstocks that do not conflict with food and animal feed, and their renewal through biodegradation under diverse environmental conditions as the desired end-of-life option indeed constitute a paradigm shift for today’s plastics industry. Considering the ever-in-creasing environmental problems associated with the disposal or incineration of fossil plastics, the increasing microplastic formation, food contamination, and rising atmospheric CO 2 concentrations, have made it clear that the time is ripe for alternative, inno-vative, and sustainable polymers with plastic-like properties. In this nexus, the present review shines new light on the benefits of biobased and, at the same time, biodegradable microbial polyhydroxyalkanoate (PHA) biopolyesters. Special emphasis is dedicated to carbon recyclability through biodegradability and compostability of these fascinating natural materials, which are slowly but surely being commercialized as replacement for fossil plastics that are produced and disposed of in multi-million-ton scale annually, resulting in a growing environmental threat. This review highlights that end-of-life options of PHA are analogous or even superior to another well-known polymer from nature, cellulose, while PHA offer the additional attributes of plastics in use with tailor-made properties. Finally, the review demonstrates how PHA biopolyesters can contribute to reaching many of the heavily discussed and desired UN Sustainable Development Goals.
{"title":"Polyhydroxyalkanoate (PHA) Bio-polyesters – Circular Materials for Sustainable Development and Growth","authors":"M. Koller, A. Mukherjee","doi":"10.15255/cabeq.2022.2124","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2124","url":null,"abstract":"Achieving circularity in materials requires fundamental changes in the polymers we use today and the way they are produced. Functional polymeric materials from renewable feedstocks that do not conflict with food and animal feed, and their renewal through biodegradation under diverse environmental conditions as the desired end-of-life option indeed constitute a paradigm shift for today’s plastics industry. Considering the ever-in-creasing environmental problems associated with the disposal or incineration of fossil plastics, the increasing microplastic formation, food contamination, and rising atmospheric CO 2 concentrations, have made it clear that the time is ripe for alternative, inno-vative, and sustainable polymers with plastic-like properties. In this nexus, the present review shines new light on the benefits of biobased and, at the same time, biodegradable microbial polyhydroxyalkanoate (PHA) biopolyesters. Special emphasis is dedicated to carbon recyclability through biodegradability and compostability of these fascinating natural materials, which are slowly but surely being commercialized as replacement for fossil plastics that are produced and disposed of in multi-million-ton scale annually, resulting in a growing environmental threat. This review highlights that end-of-life options of PHA are analogous or even superior to another well-known polymer from nature, cellulose, while PHA offer the additional attributes of plastics in use with tailor-made properties. Finally, the review demonstrates how PHA biopolyesters can contribute to reaching many of the heavily discussed and desired UN Sustainable Development Goals.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42472554","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 : 2023-02-14DOI: 10.15255/cabeq.2022.2112
A. Cortesi, N. De Zordi, S. Dall'acqua, A. Calabretti, E. Neau
The supercritical carbon dioxide extraction of lyophilized berries of Aristotelia chilensis (Mol.) Stuntz was studied as possible pre-treatment for enhanced anthocyanin recovery. Effect of pressure, temperature, and process time on the extracted oil yields and on the anthocyanins recovery in the pre-treated fractions were considered. The operating parameters were optimized using the central composite design, and extractions were run in the pressure, temperature, and time ranges of 99.6 to 200.4 bar, 36.6 to 53.4 °C
{"title":"Supercritical Carbon Dioxide Extraction of Lyophilized Aristotelia chilensis (Mol.) Stuntz Berries as Pre-treatment for Enhanced Anthocyanin Recovery","authors":"A. Cortesi, N. De Zordi, S. Dall'acqua, A. Calabretti, E. Neau","doi":"10.15255/cabeq.2022.2112","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2112","url":null,"abstract":"The supercritical carbon dioxide extraction of lyophilized berries of Aristotelia chilensis (Mol.) Stuntz was studied as possible pre-treatment for enhanced anthocyanin recovery. Effect of pressure, temperature, and process time on the extracted oil yields and on the anthocyanins recovery in the pre-treated fractions were considered. The operating parameters were optimized using the central composite design, and extractions were run in the pressure, temperature, and time ranges of 99.6 to 200.4 bar, 36.6 to 53.4 °C","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45016734","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 : 2023-02-14DOI: 10.15255/cabeq.2022.2100
J. Pavlíček, G. Bogdanić, I. Wichterle
Vapor-liquid equilibria were measured isothermally in the two title systems at 333.15, 343.15, and 353.15 K. A dynamic equilibrium still, allowing for the recirculation of both liquid and vapor phases was used. The data were correlated by means of the standard NRTL equation while considering the real behavior of the vapor phase, and with the use of the maximum likelihood procedure. Both the systems exhibited azeotropic behavior.
{"title":"Isothermal Vapor-liquid Equilibria in the 2-Propanol + Water and 2-Methylpropan-2-ol + Water Systems","authors":"J. Pavlíček, G. Bogdanić, I. Wichterle","doi":"10.15255/cabeq.2022.2100","DOIUrl":"https://doi.org/10.15255/cabeq.2022.2100","url":null,"abstract":"Vapor-liquid equilibria were measured isothermally in the two title systems at 333.15, 343.15, and 353.15 K. A dynamic equilibrium still, allowing for the recirculation of both liquid and vapor phases was used. The data were correlated by means of the standard NRTL equation while considering the real behavior of the vapor phase, and with the use of the maximum likelihood procedure. Both the systems exhibited azeotropic behavior.","PeriodicalId":9765,"journal":{"name":"Chemical and Biochemical Engineering Quarterly","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43156525","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}
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