scholarly journals Differential evolution-based optimization of corn stalks black liquor decolorization using active carbon and TiO2/UV

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mircea Teodor Nechita ◽  
Gabriel Dan Suditu ◽  
Adrian Cătălin Puițel ◽  
Elena Niculina Drăgoi
Keyword(s):  
Differential Evolution ◽  
Process Parameters ◽  
Active Carbon ◽  
Contact Time ◽  
Path Length ◽  
Irradiation Time ◽  
Black Liquor ◽  
Process Efficiency ◽  
Carbon Adsorption ◽  
Rsm Optimization

AbstractIn this work, the active carbon adsorption and TiO2/UV decolorization of black liquor were studied through experimental analysis (planned using Design of Experiments), modelling and optimization (with Response Surface Method and Differential Evolution). The aim is to highlight the importance of optimization methods for increasing process efficiency. For active carbon adsorption, the considered process parameters were: quantity of active carbon, dilution, and contact time. For TiO2 promoted photochemical decolorization the process parameters were: TiO2 concentration, UV path length and irradiation time. The determined models had an R squared of 93.82% for active carbon adsorption and of 92.82% for TiO2/UV decolorization. The optimization of active carbon resulted in an improvement from 83.08% (corresponding to 50 g/L quantity of active carbon, 30 min contact time and 200 dilution) to 100% (corresponding to multiple combinations). The optimization of TiO2/UV decolorization indicated an increase of efficiency from 36.63% (corresponding to 1 g/L TiO2 concentration, 60 min irradiation time and 5 cm UV path length) to 46.83% (corresponding to 0.4 g/L TiO2 concentration, 59.99 min irradiation time and 2.85 cm UV path length). These results show that the experiments and the subsequent standard RSM optimization can be further improved, leading to better performance.

scholarly journals Differential Evolution-based Optimization of Corn Stalks Black Liquor Decolorization with Active Carbon Adsorption and TiO2 Promoted Photochemical Degradation

2021 ◽  
Author(s):  
Nechita Teodor ◽  
Suditu Dan ◽  
Puițel Cătălin ◽  
Elena Niculina Dragoi
Keyword(s):  
Differential Evolution ◽  
Process Parameters ◽  
Active Carbon ◽  
Irradiation Time ◽  
Black Liquor ◽  
Optimization Methods ◽  
Process Efficiency ◽  
Photochemical Degradation ◽  
Carbon Adsorption ◽  
Rsm Optimization

Abstract In this work, the active carbon adsorption and TiO2 promoted photochemical degradation of black liquor decolorization were studied through experimental analysis (planned using Design of Experiments), modelling and optimization (with Response Surface Method and Differential Evolution). The aim is to highlight the importance of optimization methods for increasing process efficiency. For active carbon adsorption the considered process parameters were: quantity of active carbon, dilution, and contact time; for TiO2 promoted photochemical degradation the process parameters were: TiO2 concentration, UV path length and irradiation time. The determined models had an R squared of 93.82% for active carbon adsorption and of 92.82% for TiO2 based degradation. In the optimization phase, for active carbon, an improvement from 81.27–100% and for TiO2-based degradation from 36.63–46.83% was obtained. These results show that the experiments and the subsequent standard RSM optimization data can be further improved, leading to better performance.

scholarly journals Evolution of The Extruder Screw-Disk Plasticizing System Construction

2018 ◽  
Vol 1 (1) ◽  
pp. 539-544
Author(s):  
Tomasz Rydzkowski ◽  
Iwona Michalska-Pożoga ◽  
Marcin Szczepanek ◽  
Vijay Kumar Thakur
Keyword(s):  
Process Parameters ◽  
Polymer Processing ◽  
Process Efficiency ◽  
System Construction ◽  
Existing Structures ◽  
Extruder Screw ◽  
Properties Of Materials ◽  
Market Needs ◽  
High Degree ◽  
The Impact

Abstract The search for new polymer processing ways has become necessary due to the rapidly growing technology and market needs. The time of manufacturing products, as well as the impact of process parameters and the design itself on the properties of materials have become very important. Therefore, the creation of assumptions allowing the construction of a compact device whose construction will allow, for example, high process efficiency at low screw rotational speeds or a high degree of material homogenisation, is expected by the market. However, this requires the design of new or continuous modifications and improvements to existing structures.

scholarly journals Biosorption of Lead Ions from Aqueous Solution UsingFicus benghalensisL.

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Venkateswara Rao Surisetty ◽  
Janusz Kozinski ◽  
L. Rao Nageswara
Keyword(s):  
Aqueous Solution ◽  
Process Parameters ◽  
Contact Time ◽  
Batch Process ◽  
Ion Concentration ◽  
Lead Ions ◽  
Lead Ion ◽  
Maximum Adsorption Capacity ◽  
Ficus Benghalensis ◽  
Leaf Powder

Ficus benghalensisL., a plant-based material leaf powder, is used as an adsorbent for the removal of lead ions from aqueous solution using the biosorption technique. The effects of process parameters such as contact time, adsorbent size and dosage, initial lead ion concentration, and pH of the aqueous solution on bio-sorption of lead byFicus benghalensisL. were studied using batch process. The Langmuir isotherm was more suitable for biosorption followed by Freundlich and Temkin isotherms with a maximum adsorption capacity of 28.63 mg/g of lead ion on the biomass ofFicus benghalensisL. leaves.

Production cost optimization of enzyme washing for indigo dyed cotton denim by combining Kriging surrogate with differential evolution algorithm

2020 ◽  
Vol 90 (15-16) ◽  
pp. 1860-1871
Author(s):  
Jie Xu ◽  
Zhenglei He ◽  
Sheng Li ◽  
Wenbo Ke
Keyword(s):  
Differential Evolution ◽  
Process Parameters ◽  
Production Cost ◽  
Cost Optimization ◽  
Differential Evolution Algorithm ◽  
Kriging Model ◽  
Production Costs ◽  
Color Strength ◽  
Washing Process ◽  
Input Parameters

The enzyme washing process is extensively applied in the industrial production of denim garments. The process parameters of enzyme washing have significant effects on washing performances and costs. Since the relationships between the process parameters and washing performances cannot be expressed explicitly, it is impractical to determine the process parameters to obtain the optimal production cost while satisfying requirements of customers intuitively. This paper proposes an optimization methodology by combining Kriging surrogate and differential evolution (DE) algorithm to address the production cost optimization of enzyme washing for indigo dyed cotton denim. First, an experiment using Taguchi L16 orthogonal array is conducted where temperature and concentration of cellulase enzyme are taken into consideration with processing time as the input parameters, while the washing performances (including color strength value, stiffness, and tensile strength in warp and weft directions of the washed denim fabrics) are the output responses. Second, the relationships between the inputs and outputs are established using the Kriging model. Third, the effects of the input parameters on the washing performances are analyzed, and the production cost optimization model is illustrated. Finally, a case study is given to depict the optimization process and a verification experiment is conducted to verify the effectiveness of the optimal values. On the whole, the proposed hybrid method, Kriging-DE, shows great capability of optimizing the production costs of the enzyme washing process for indigo dyed cotton denim.

Process Capability of Aerosol-Jet Additive Processes for Long-Runs Up to 10-Hours

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Pradeep Lall ◽  
Amrit Abrol ◽  
Nakul Kothari ◽  
Benjamin Leever ◽  
Scott Miller
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Process Capability ◽  
High Volume ◽  
Process Efficiency ◽  
Shear Load ◽  
Additive Processes ◽  
Sintering Time ◽  
Load To Failure ◽  
Aerosol Jet Printing

Abstract Traditionally, printed circuit assemblies have been fabricated through a combination of imaging and plating-based subtractive processes involving the use of photo-exposure followed by baths for plating and etching in order to form the necessary circuitry on rigid and flexible laminates. The emergence of a number of additive technologies presents an opportunity for the development of processes for manufacturing of flexible substrates by utilizing mainstream additive processes. Aerosol-jet printing is capable of printing lines and spaces below 10 μm in width. The aerosol-jet system also supports a wide variety of materials, including nanoparticle inks, screen-printing pastes, conductive polymers, insulators, adhesives, and biological matter. The adoption of additive manufacturing for high-volume commercial fabrication requires an understanding of the print consistency and electrical mechanical properties. Little literature that addresses the effect of varying sintering time and temperature on the shear strength and resistivity of the printed lines exists. In this study, the effect of process parameters on the resultant line consistency and mechanical and electrical properties has been studied. Print process parameters studied include sheath rate, mass flow rate, nozzle size, substrate temperature, and chiller temperature. Properties include resistance and shear load to failure of the printed electrical line as a function of varying sintering time and temperature. The aerosol-jet machine has been used to print interconnects. Printed samples have been exposed to different sintering times and temperatures. The resistance and shear load to failure of the printed lines have been measured. The underlying physics of the resultant trend was then investigated using elemental analysis and scanning electron microscopy. The effect of line consistency drift over prolonged runtimes has been measured for up to 10 h of runtime. The printing process efficiency has been gaged as a function of the process capability index (Cpk) and process capability ratio (Cp). Printed samples were studied offline utilizing optical profilometry in order to analyze the consistency within the line width, height, and resistance, and shear load to study the variance in electrical and mechanical properties over time.

Research on Tool Wear and Compensation Method of Ultrasonic Milling

2012 ◽  
Vol 217-219 ◽  
pp. 2088-2092
Author(s):  
Dong Ju Feng ◽  
Zhan Guo Xu
Keyword(s):  
Tool Wear ◽  
Process Parameters ◽  
Path Length ◽  
Compensation Method ◽  
Experimental Results ◽  
Ultrasonic Milling

The phenomenon of tool wear and its generating reason and mechanism in ultrasonic milling are analyzed. Then, the effect of various process parameters on tool wear is researched. It is educed through analysis that compensation method of tool wear according to the path length of tool is more suitable for ultrasonic milling. The experimental results show that the mode of ultrasonic milling is completely feasible, and the compensation of tool longitudinal wear can be realized.

Phenol Removal from Aqueous Solution by Microwave Combined with Granular Active Carbon

2013 ◽  
Vol 807-809 ◽  
pp. 1543-1546
Author(s):  
Dong Yuan ◽  
Da You Fu ◽  
Ming Sheng Gui ◽  
Wen Yuan Tan
Keyword(s):  
Aqueous Solution ◽  
Active Carbon ◽  
Microwave Power ◽  
Irradiation Time ◽  
Removal Rate ◽  
Order Reaction ◽  
Phenol Removal ◽  
Effective Factors ◽  
First Order ◽  
Granular Active Carbon

The removal of phenol from aqueous solution was evaluated by using microwave technique assisted with active carbon. The effective factors such as the concentration of phenol , active carbon dosage, microwave power and irradiation time on the removal rate were investigated. When the concentration of phenol was 150 mg/l, active carbon dosage was 6 g/l, microwave power was 500 W, and irradiation time was 8 min, the removal ratio of phenol reached 95. 03%. The research on kinetics suggested that the process of treatment accords to the first-order reaction.

scholarly journals Study of the performance of disinfection with sodium hypochlorite on a full-scale sewage treatment plant

2020 ◽  
Vol 15 (6) ◽  
pp. 1
Author(s):  
Maria Rosaria Boni ◽  
Sabrina Copelli ◽  
Massimo Raboni
Keyword(s):  
Sodium Hypochlorite ◽  
Retention Time ◽  
Contact Time ◽  
Regression Line ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Process Efficiency ◽  
Residual Chlorine

A full-scale sewage treatment plant was investigated to assess the performance of the disinfection stage. Sodium hypochlorite was used as a disinfectant agent and the process efficiency was evaluated by E.coli removal. The research took place over a period of two years in order to evaluate the effect of retention time (t) and residual chlorine (Cr) under different seasonal conditions. The effectiveness of E.coli removal with sodium hypochlorite proved to be strictly dependent on the factor CR  t (product of residual chlorine with the contact time). The regression line of the experimental points was, on the whole, well comparable with the model proposed by Collins, especially in the field of CRt lower than 30 mg L-1 min.

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