scholarly journals Modeling of Spiral Wound Membranes for Gas Separations—Part II: Data Reconciliation for Online Monitoring

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1035
Author(s):  
Diego Queiroz Faria de Menezes ◽  
Marília Caroline Cavalcante de Sá ◽  
Tahyná Barbalho Fontoura ◽  
Thiago Koichi Anzai ◽  
Fabio Cesar Diehl ◽  
...  
Keyword(s):  
Real Time ◽  
Error Detection ◽  
Web Application ◽  
Membrane Separation ◽  
Critical Evaluation ◽  
Soft Sensor ◽  
Data Reconciliation ◽  
Separation Processes ◽  
Pre Treatment

The present work presents a methodology based on data reconciliation to monitor membrane separation processes reliably, online and in real time for the first time. The proposed methodology was implemented in accordance with the following steps: data acquisition; data pre-treatment; data characterization; data reconciliation; gross error detection; and critical evaluation of measured data with a soft sensor. The acquisition of data constituted the slowest stage of the monitoring process, as expected in real-time applications. The pre-treatment stage was fundamental to assure the robustness of the code and the initial characterization of collected data was carried out offline. The characterization of the data showed that steady-state modeling of the process would be appropriate, also allowing the implementation of faster numerical procedures for the data reconciliation step. The data reconciliation step performed well, quickly and consistently. Thus, data reconciliation allowed the estimation of unmeasured variables, playing the role of a soft sensor and allowing the future installation of a digital twin. Additionally, monitoring of measurement bias constituted a tool for measurement diagnosis. As shown in the manuscript, the proposed methodology can be successfully implemented online and in real time for monitoring of membrane separation processes, as shown through a real dashboard web application developed for monitoring of an actual industrial site.

A review on membrane applications and transport mechanisms in vacuum membrane distillation

2017 ◽  
Vol 34 (1) ◽  
Author(s):  
Rakesh Baghel ◽  
Sushant Upadhyaya ◽  
Kailash Singh ◽  
Satyendra P. Chaurasia ◽  
Akhilendra B. Gupta ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Membrane Separation ◽  
Critical Evaluation ◽  
Experimental Studies ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Separation Processes ◽  
Vacuum Membrane Distillation ◽  
Polarization Coefficient ◽  
The Impact

AbstractThe main aim of this article is to provide a state-of-the-art review of the experimental studies on vacuum membrane distillation (VMD) process. An introduction to the history of VMD is carried out along with the other membrane distillation configurations. Recent developments in process, characterization of membrane, module design, transport phenomena, and effect of operating parameters on permeate flux are discussed for VMD in detail. Several heat and mass transfer correlations obtained by various researchers for different VMD modules have been discussed. The impact of membrane fouling with its control in VMD is discussed in detail. In this paper, temperature polarization coefficient and concentration polarization coefficient are elaborated in detail. Integration of VMD with other membrane separation processes/industrial processes have been explained to improve the performance of the system and make it more energy efficient. A critical evaluation of the VMD literature is incorporated throughout this review.

scholarly journals Review of Different Purification Techniques for Crude Glycerol from Biodiesel Production

2018 ◽  
pp. 1-6
Author(s):  
Oluwasegun Soliu Muniru ◽  
Chika Scholastica Ezeanyanaso ◽  
Emmanuel Uzoma Akubueze ◽  
Chima Cartney Igwe ◽  
Gloria Nwakaego Elemo
Keyword(s):  
Crude Glycerol ◽  
Membrane Separation ◽  
Critical Evaluation ◽  
Cost Effective ◽  
Biodiesel Production ◽  
Process Technology ◽  
Federal Institute ◽  
Exchange Adsorption ◽  
Pre Treatment ◽  
Methanol Removal

The global glycerol market has experienced a surplus in recent decades due to an increase in biodiesel production and thus created a new form of challenge in terms of purification of the crude glycerol. Various techniques have been developed worldwide on purification of crude glycerol. These processes include chemical pre-treatment, methanol removal, vacuum distillation, ion exchange, adsorption, solvent extraction and membrane separation technology to mention a few. In Nigeria, domesticating these technologies or techniques to suit our peculiar situation and also be cost effective needs a critical evaluation of all the available options. This review, therefore, summarises the progress of crude glycerol purification technologies using various techniques as compared with the process technology developed by researchers at the Federal Institute of Industrial Research, Oshodi, Lagos Nigeria.

scholarly journals Understanding Patient-Based Real-Time Quality Control Using Simulation Modeling

2020 ◽  
Vol 66 (8) ◽  
pp. 1072-1083 ◽  
Author(s):  
Andreas Bietenbeck ◽  
Mark A Cervinski ◽  
Alex Katayev ◽  
Tze Ping Loh ◽  
Huub H van Rossum ◽  
...  
Keyword(s):  
Quality Control ◽  
Real Time ◽  
Error Detection ◽  
Web Application ◽  
Block Size ◽  
Control Limit ◽  
False Alarms ◽  
Real Patient ◽  
The Individual ◽  
And Control

Abstract Background Patient-based real-time quality control (PBRTQC) avoids limitations of traditional quality control methods based on the measurement of stabilized control samples. However, PBRTQC needs to be adapted to the individual laboratories with parameters such as algorithm, truncation, block size, and control limit. Methods In a computer simulation, biases were added to real patient results of 10 analytes with diverse properties. Different PBRTQC methods were assessed on their ability to detect these biases early. Results The simulation based on 460 000 historical patient measurements for each analyte revealed several recommendations for PBRTQC. Control limit calculation with “percentiles of daily extremes” led to effective limits and allowed specification of the percentage of days with false alarms. However, changes in measurement distribution easily increased false alarms. Box–Cox but not logarithmic transformation improved error detection. Winsorization of outlying values often led to a better performance than simple outlier removal. For medians and Harrell–Davis 50 percentile estimators (HD50s), no truncation was necessary. Block size influenced medians substantially and HD50s to a lesser extent. Conversely, a change of truncation limits affected means and exponentially moving averages more than a change of block sizes. A large spread of patient measurements impeded error detection. PBRTQC methods were not always able to detect an allowable bias within the simulated 1000 erroneous measurements. A web application was developed to estimate PBRTQC performance. Conclusions Computer simulations can optimize PBRTQC but some parameters are generally superior and can be taken as default.

scholarly journals Purification of Dairy Wastewaters by Advanced Oxidation Processes and Membrane Filtration

2017 ◽  
Vol 11 (1) ◽  
pp. 32-38
Author(s):  
Mihály Zakar ◽  
Erika Lakatos ◽  
Gábor Keszthelyi-Szabó ◽  
Zsuzsanna László
Keyword(s):  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Separation ◽  
Separation Efficiency ◽  
Scale Up ◽  
Separation Processes ◽  
Physicochemical Changes ◽  
Current Trends ◽  
Pre Treatment ◽  
Cost Efficient

Membrane separation processes are space and cost-efficient, easy to scale-up operations, which have proved to treat food industrial wastewaters efficiently. Beside the advantages like high separation efficiency without any chemical changes and low energy-intensity, membrane filtration also has drawbacks, like decreased operational efficiency caused by flux decile resulting from fouling and concentration polarization. Combination of oxidation pre-treatment and membrane filtration is a promising method for decreasing fouling due to the physicochemical changes caused by pre-oxidation of the wastewater in structure of colloidal pollutants and in the interactions between the foulants and the membrane material. The aim of this work is to identify the parameters affecting the membrane fouling during treatment of dairy wastewaters, and present the current trends of research in this field.

scholarly journals Characterization of polymer membranes by contact angle goniometer

2014 ◽  
Vol 8 (2) ◽  
pp. 18-22 ◽  
Author(s):  
Szabolcs Kertész ◽  
T. B. De Freitas ◽  
Cecília Hodúr
Keyword(s):  
Contact Angle ◽  
Membrane Fouling ◽  
Water Droplet ◽  
Membrane Separation ◽  
Contact Angles ◽  
Permeate Flux ◽  
Separation Processes ◽  
Membrane Sample ◽  
Uf Membranes

The wider applications of all membrane separation processes have a main obstacle, namely the fouling phenomena, which have to be understood in more details. Surface properties, hydrophilic and hydrophobic characteristics of a polymer membrane can be determined by measuring the contact angle. The hydrophilicity of a membrane has an important influence on its performances, like permeate flux, membrane rejection or membrane fouling characteristics. In our work the contact angles of three kinds of typically commercial ultrafiltration (UF-PES-4), nanofiltration (NE-90) and reverse osmosis (LFC-30) membranes were firstly investigated and compared by contact angle goniometer measurements. The relationships between the contact angles were researched by well considering the effects of membrane sample pretreatments by distilled water prewetting and water droplet volume. Furthermore, the effects of prewetting, water droplet contact time on different molecular weight cut-off ultrafiltration membranes’ surface and droplet pH on the contact angle values were also investigated. Moreover, fresh, clean and dry, as well as pretreated, and fouled UF membranes were also measured and compared.

Real-time error detection techniques based on FPGA

2013 ◽  
Vol 33 (5) ◽  
pp. 1459-1462
Author(s):  
Xiaoming JU ◽  
Jiehao ZHANG ◽  
Yizhong ZHANG
Keyword(s):  
Real Time ◽  
Error Detection ◽  
Time Error ◽  
Detection Techniques
Sign in / Sign up

Export Citation Format

Share Document