{"title":"Scaling in reverse osmosis seawater desalination: Mechanism and prevention—A literature review","authors":"Jiaxuan Shen, Xiaodong Wang, Xiaoyi Zhu, Bojin Tang, Cong Liu, Wan Li, Xueqiang Gao","doi":"10.1002/cjce.25427","DOIUrl":"10.1002/cjce.25427","url":null,"abstract":"<p>There is currently a huge imbalance between the demand and supply of freshwater resources. The shortage of fresh water can be mitigated by seawater desalination. Reverse osmosis (RO) is currently the most popular desalination technology around the world. Despite its various advantages, fouling has been one of its major limitations of RO. Membrane fouling can be divided into four categories: colloidal fouling, inorganic fouling, organic fouling, and biofouling. Precipitation of inorganic salts of small solubility, among which CaCO<sub>3</sub>, CaSO<sub>4</sub>, BaSO<sub>4</sub>, and SiO<sub>2</sub> are the most common ones, are the cause of inorganic fouling, which is commonly referred to as scaling. Pretreatment technologies for prevention or mitigation of scaling in the RO process can be classified as conventional pretreatment technologies, which include water softening and scale inhibitors, and membrane-based pretreatment technologies which include nanofiltration, forward osmosis, and membrane surface modification.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 2","pages":"503-523"},"PeriodicalIF":1.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A new design of double predictive proportional integral control strategy for first order plus dead time industrial processes","authors":"Chonggao Hu, Yuqiao Hou, Jianjun Bai, Hongbo Zou","doi":"10.1002/cjce.25442","DOIUrl":"10.1002/cjce.25442","url":null,"abstract":"<p>When the Smith predictive controller controls the first-order plus dead time process, it is too sensitive to the parameter changes of the system, leading to poor system stability and no practical application value. First, this paper derives and proves the equivalent form of the Smith-proportional-integral-derivative (PID) control strategy as a predictive PI (PPI) control strategy. Second, this paper proposes a new double predictive PI control strategy (DPPI), where the DPPI controller mainly consists of a predictive PI controller and a predictor with an integral link. Again, for the integral predictor in the DPPI control strategy, two new regulation parameters are introduced, which can effectively regulate the control performance and robustness of the control system, improve the degree of freedom of the controller design, and give the principles for the adjustment of the DPPI controller parameters. Finally, it has been verified through simulation experiments that the proposed method can significantly improve response speed and effectively resist external perturbations with good control effect and robust stability.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 3","pages":"1349-1362"},"PeriodicalIF":1.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141887315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rapid determination of the antimicrobial properties of surfaces using an enzymatic activity surrogate","authors":"Shazia Tanvir, Amandeep Kaur, William A. Anderson","doi":"10.1002/cjce.25436","DOIUrl":"10.1002/cjce.25436","url":null,"abstract":"<p>Typical approaches for assessing the antimicrobial activity of metals-based surfaces involve the contact of a bacterial culture with the surface for a period of time, followed by culturing on agar plates to assess the decrease in microbial viability versus controls. This is a time-consuming methodology requiring at least 24 h to produce a set of results, which can be a bottleneck for productivity in novel materials development. An enzyme-based method was shown to be a satisfactory and much more rapid surrogate test for this application. A β-galactosidase solution was applied to copper, silver, and zinc-based antimicrobial surfaces for up to 1 h, and then the rate of colour development at 578 nm was monitored for a few minutes after addition of the chromogenic enzyme substrate chlorophenol red-β-d-galactopyranoside (CPRG). Highly active antimicrobial surfaces were detected by a lack of colour development, due to enzyme inhibition by the metals. The enzymatic reaction rates were quantified and compared, demonstrating that the copper sample showed the greatest inhibition effect followed by the silver and zinc samples. The antimicrobial activity was quantified using bacteria and the plate count method, and the results correlated well with this enzyme assay, demonstrating that the metals-based antimicrobial activities of both hard and soft (textile) surfaces could be quickly assessed with this enzyme-based methodology.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 3","pages":"1276-1284"},"PeriodicalIF":1.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cjce.25436","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Parameter sensitivity of a wood chips flow model","authors":"Sofia Evysdotter, Tomas Vikström, Anders Rasmuson","doi":"10.1002/cjce.25435","DOIUrl":"10.1002/cjce.25435","url":null,"abstract":"<p>A computational fluid dynamics (CFD) study of the parameter sensitivity of a wood chips model was performed on an industrial impregnation vessel, which is the first step in a continuous cooking system. The solid and liquid phases were both treated as continua and it was found that the continuum model for the solid wood chips phase could capture the previously observed oscillating formation of arches in the contracting part of the vessel, which will occur at different levels of volume fraction depending on the material constants. The parameters that were examined are the solid pressure, permeability, viscosity, and wall friction. It was found that all the parameters strongly affect the distribution of the wood chips in the vessel as well as the oscillation effects, hence also the flow field which is important to accurately predict in order to ensure optimal performance of the impregnation vessel. Thus, correct material data for these types of simulations are crucial to the outcome and should be chosen for the appropriate situation and bio-material.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 2","pages":"868-879"},"PeriodicalIF":1.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cjce.25435","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Forced convection heat transfer from confined circular/semi-circular heaters and coolers with various orientations","authors":"Rajvinder Kaur, Sapna Sharma, Avinash Chandra","doi":"10.1002/cjce.25439","DOIUrl":"10.1002/cjce.25439","url":null,"abstract":"<p>The combined implementation of porous medium and hybrid nanofluid with heaters and coolers can be an effective technique to improve the efficiency of several types of electric equipment. In this regard, the present study has been conducted to analyze the forced convection heat transfer of <span></span><math>\u0000 <mrow>\u0000 <msub>\u0000 <mi>Al</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 <msub>\u0000 <mi>O</mi>\u0000 <mn>3</mn>\u0000 </msub>\u0000 <mo>-</mo>\u0000 <mi>CuO</mi>\u0000 </mrow></math> water-based hybrid nanofluid in porous channel with pairs of heaters and coolers of various shapes. The circular and semi-circular heaters and coolers with distinct orientations are considered. The Peclet number <span></span><math>\u0000 <mrow>\u0000 <mfenced>\u0000 <mrow>\u0000 <mn>25</mn>\u0000 <mo>≤</mo>\u0000 <mi>Pe</mi>\u0000 <mo>≤</mo>\u0000 <mn>200</mn>\u0000 </mrow>\u0000 </mfenced>\u0000 </mrow></math>, Darcy number <span></span><math>\u0000 <mrow>\u0000 <mfenced>\u0000 <mrow>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>6</mn>\u0000 </mrow>\u0000 </msup>\u0000 <mo>≤</mo>\u0000 <mi>Da</mi>\u0000 <mo>≤</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 </mfenced>\u0000 </mrow></math>, porosity <span></span><math>\u0000 <mrow>\u0000 <mfenced>\u0000 <mrow>\u0000 <mn>0.1</mn>\u0000 <mo>≤</mo>\u0000 <mi>ε</mi>\u0000 <mo>≤</mo>\u0000 <mn>0.9</mn>\u0000 </mrow>\u0000 </mfenced>\u0000 </mrow></math>, and volume fraction of hybrid nanoparticles <span></span><math>\u0000 <mrow>\u0000 <mfenced>\u0000 <mrow>\u0000 <mn>0.02</mn>\u0000 <mo>≤</mo>\u0000 <mi>ϕ</mi>\u0000 <mo>≤</mo>\u0000 <mn>0.08</mn>\u0000 </mrow>\u0000 </mfenced>\u0000 </mrow></math> are chosen as the governing parameters. The governing equations are solved by using the finite element method based commercial software COMSOL Multiphysics. The acquired results exhibit that the heat transfer from heaters and coolers is enhanced by decreasing <span></span><math>\u0000 <mrow>\u0000 <mi>ε</mi>\u0000 </mrow></math> and <span></span><ma","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"102 11","pages":"3756-3775"},"PeriodicalIF":1.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimizing delignification and saccharification process for sawdust processing using a central composite design","authors":"Priya Yadav, Julie Kring, Parag R. Gogate","doi":"10.1002/cjce.25434","DOIUrl":"10.1002/cjce.25434","url":null,"abstract":"<p>Lignocellulosic mass consists of cellulose, hemicelluloses, and lignin. Although biomass promises to be efficiently used for biofuel production and many other value-added products, lignin present in lignocellulosic biomass affects the hydrolysis of cellulose and hemicelluloses, making it necessary to develop techniques that provide better lignin removal efficiency and high cellulose hydrolysability. The current work aims to maximize lignin removal in sawdust and develop an understanding of the hydrolysis of pretreated biomass for sugar production. Different parameters such as solvent to solid ratio, temperature, and reaction time have been considered based on the design of experiment to understand the effect on the delignification and saccharification processes. After treating sawdust for 1.5 h, it was observed that a maximum of 85% lignin was removed at a temperature of 131°C and solid loading of 16 g. Subsequent hydrolysis of delignified sawdust at 131°C temperature, solvent to solid ratio 15, and 0.5 h resulted in a maximum reducing sugar production of 26.82 mg/mL. The study elucidated the optimum conditions for the effective processing of sawdust in terms of delignification and saccharification, leading to maximum benefits in lignin removal and sugar production.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"102 11","pages":"3723-3733"},"PeriodicalIF":1.6,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robust optimization of cascaded MSMPR crystallization unit using unsupervised machine learning","authors":"Ravi Kiran Inapakurthi, Kishalay Mitra","doi":"10.1002/cjce.25431","DOIUrl":"10.1002/cjce.25431","url":null,"abstract":"<p>The use of mixed suspension mixed product removal (MSMPR) system in the pharmaceutical industry to produce active pharmaceutical ingredients is well known. In industrial settings, the MSMPR system is subject to lot of process uncertainty which, if ignored, might result in poor product quality. In this work, the process uncertainty involved in MSMPR is targeted during the process optimization stage to find robust optimal operating conditions. The temperature and the residence time inside each cascaded MSMPR unit, altogether six, are considered as uncertain parameters. A sampled set of uncertain data points for such six different uncertain parameters are clustered using a novel support vector clustering (SVC) based algorithm. The uniqueness of this algorithm lies in its ability to fine-tune the hyper-parameters of SVC while intelligently clustering the uncertain data points into optimal number of clusters. Such identified clusters are helpful to generate more samples from the intended regions rather than generating them randomly to avoid proposing conservative solutions. Both best-case and worst-case scenarios for robust oOptimization (RO) are considered with <span></span><math>\u0000 <mrow>\u0000 <mn>500</mn>\u0000 <mo>,</mo>\u0000 <mn>1000</mn>\u0000 </mrow></math>, and <span></span><math>\u0000 <mrow>\u0000 <mn>1500</mn>\u0000 </mrow></math> samples. As the model has to be evaluated for a large number of samples and the MSMPR models are time-consuming to evaluate, a surrogate model of the MSMPR process is developed to perform optimization under uncertainty. Performance metrics are used to quantitatively establish the superiority of the SVC based RO over the box-sampling based RO.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 3","pages":"1112-1121"},"PeriodicalIF":1.6,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abbas Bakhtom, Saeed Ghasemzade Bariki, Salman Movahedirad
{"title":"Exploring innovative strategies for precipitation extent enhancement in a downscaled Bayer process tank","authors":"Abbas Bakhtom, Saeed Ghasemzade Bariki, Salman Movahedirad","doi":"10.1002/cjce.25423","DOIUrl":"10.1002/cjce.25423","url":null,"abstract":"<p>The Bayer process is a cornerstone of alumina production, and its precipitation stage holds the key to both efficiency and product quality. In this study, we embarked on a comprehensive exploration of strategies to enhance the precipitation extent of aluminium hydroxide, a pivotal step in the Bayer process. Utilizing a newly constructed reactor, along with experiments using reactors in series, we rigorously experimented with various factors, including the addition of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) as an enhancer, seed activation methods, the integration of a hydrocyclone within the processing unit, the application of a magnetic field, and the injection of supersaturated liquor midway through the process. These diverse strategies were systematically assessed to decipher their individual and synergistic effects on precipitation extent. Our research aims to uncover the optimal conditions for maximizing alumina precipitation while maintaining product quality and seed particle stability. By offering new insights and practical solutions, this study contributes to the ongoing advancement of alumina production within the Bayer process.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 2","pages":"941-952"},"PeriodicalIF":1.6,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chengyu Zhou, Yating Chen, Ying Xiao, Yani Wu, Chunming Yang, Mengjie Yu, Lin Liu
{"title":"Preparation and performance analysis of nano-crosslinking agent for sulphonated guar gum fracturing fluid","authors":"Chengyu Zhou, Yating Chen, Ying Xiao, Yani Wu, Chunming Yang, Mengjie Yu, Lin Liu","doi":"10.1002/cjce.25425","DOIUrl":"10.1002/cjce.25425","url":null,"abstract":"<p>In order to solve the problems of poor temperature resistance and low crosslinking efficiency of crosslinking agent for sulphonated guar gum fracturing fluid, in this paper, nano-silica was reacted with 3-aminopropyltriethoxysilane to obtain surface-modified nano-silica, which was then reacted with boric acid and n-butyl titanate to obtain nano-silica-based boron-titanium composite crosslinking agent. Its physical properties and structure were characterized by infrared (IR), laser particle size analysis, X-ray diffraction (XRD), and atomic force microscopy (AFM). The sulphonated hydroxypropyl guar gum fracturing fluids formed by nano-crosslinking agent were analyzed: When the temperature was uniformly increased from 25 to 120°C and the shear rate was 170 s<sup>−1</sup>, the viscosity was finally constant at about 50 mPa · s, which indicated that the temperature and shear resistance were good; the system had a better filtration-loss reduction performance; the average sedimentation rate of ceramic grains in the fracturing fluid system was 0.00872 cm · min<sup>−1</sup>, indicating that the system had good sand carrying performance; the damage rate of fracturing fluid filtrate to the core was 23.33%; the gel breaking performance test showed that the fracturing fluid had good gel breaking performance. By analyzing the performance of the fracturing fluid, it can be seen that the nano-crosslinking agent has the advantages of good temperature resistance and high cross-linking efficiency compared with the traditional boron and titanium cross-linking agents.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"103 2","pages":"953-963"},"PeriodicalIF":1.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gage T. Mason, Daniella Skaf, Anindya L. Roy, Rahaf Nafez Hussein, Tiago Carneiro Gomes, Eric Landry, Peng Xiang, Konrad Walus, Tricia Breen Carmichael, Simon Rondeau-Gagné
{"title":"Printing organic-field effect transistors from semiconducting polymers and branched polyethylene","authors":"Gage T. Mason, Daniella Skaf, Anindya L. Roy, Rahaf Nafez Hussein, Tiago Carneiro Gomes, Eric Landry, Peng Xiang, Konrad Walus, Tricia Breen Carmichael, Simon Rondeau-Gagné","doi":"10.1002/cjce.25426","DOIUrl":"10.1002/cjce.25426","url":null,"abstract":"<p>Organic electroactive materials, particularly semiconducting polymers, are at the forefront of emerging organic electronics. Among the plethora of unique features, the possibility to formulate inks out of these materials is particularly promising for the large-scale manufacturing of electronics at lower cost on a variety of soft substrates. While solution deposition of semiconducting materials is promising for developing printed electronics, the environmental footprint of the materials and related devices needs to be considered to achieve sustainable manufacturing. Towards the development of greener printed electronics, this work investigates the utilization of a non-toxic, environmentally-friendly solvent, namely branched polyethylene (BPE), to formulate semiconducting inks. Focusing on a diketopyrrolopyrrole-based (DPP) semiconducting polymer, shellac as dielectric, and BPE as the solvent, solutions were prepared in different concentrations and their rheological properties were characterized. Then, printing on polyethylene terephthalate (PET) substrates using two different techniques was performed to fabricate organic field-effect transistors (OFETs). Both printing techniques yielded OFETs with good performance and device characteristics, averaging approximately 10<sup>−2</sup> and 10<sup>−4</sup> cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, respectively, for slot-die coating and direct-ink writing deposition. Notably, despite some difference in threshold voltages, OFETs produced via slot-die coating and direct-ink writing showed comparable charge mobilities to previously reported OFETs prepared from similar materials, particularly those prepared on silicon dioxide wafers. Overall, this work confirms the suitability of BPE to formulate semiconducting inks to develop printed electronics in a greener manner. The printing methodology developed in this work also open new avenues for the design of functional printed electronics and related technologies.</p>","PeriodicalId":9400,"journal":{"name":"Canadian Journal of Chemical Engineering","volume":"102 12","pages":"4166-4174"},"PeriodicalIF":1.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cjce.25426","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141777191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}