scholarly journals Enhancement of CO2 Removal Efficacy of Fluidized Bed Using Particle Mixing

2018 ◽  
Vol 8 (9) ◽  
pp. 1467 ◽  
Author(s):  
Ebrahim Al-Ghurabi ◽  
Abdelhamid Ajbar ◽  
Mohammad Asif
Keyword(s):  
Fluidized Bed ◽  
Carbon Capture ◽  
Cost Effective ◽  
Co2 Concentration ◽  
Co2 Removal ◽  
External Particle ◽  
Pure Nitrogen ◽  
Particle Mixing ◽  
Step Procedure ◽  
Group B

The present study proposes a cost-effective assisted fluidization technique of particle mixing to improve the carbon capture effectiveness of a fluidized bed containing fine adsorbent powder. Using activated carbon as the adsorbent, we mixed external particle of Geldart group B classification in different fractions to examine the effectiveness of the proposed strategy of particle mixing. Four different particle-mixing cases were considered by varying the amount of added particle—0, 5, 10, and 30 wt %—on external particle-free basis. The inlet flow of the nitrogen was fixed, while two different flows of carbon dioxide were used. The adsorption experiment consisted of a three step procedure comprising purging using pure nitrogen, followed by adsorption with fixed inlet CO2 concentration, and finally the desorption step. Inlet flows of both nitrogen and CO2 were separately controlled using electronic mass flow controllers with the help of data acquisition system (DAQ). The CO2 breakthrough was carefully monitored using the CO2/O2 analyzer, whose analog output was recorded using the DAQ. Best results were obtained with 10% external particles. This is in conformity with the results of our previous study of bed hydrodynamics, which pointed to clear improvement in the fluidization behavior with particle mixing.

scholarly journals Investigation on the Removal of Carbon Dioxide Exhausted from Industrial Units in a Lab-Scale Fluidized Bed Reactor

2020 ◽  
Vol 15 (2) ◽  
pp. 579-590
Author(s):  
Puriya Mohamad Gholy Nejad ◽  
Mohammad Sadegh Hatamipour
Keyword(s):  
Calcium Hydroxide ◽  
Fluidized Bed ◽  
Surface Area ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Co2 Concentration ◽  
Fluidized Bed Reactor ◽  
Solution Flow Rate ◽  
Co2 Removal ◽  
Co2 Removal Efficiency

In this study, CO2 removal efficiency from flue gas was investigated in a fluidized bed reactor under semi-dry conditions. A lab-scale fluidized bed reactor, filled with inert glass beads, was used to investigate the effect of operating parameters on the CO2 removal efficiency using calcium hydroxide slurry as the absorbent. The Taguchi design method was used to design the experiments. The maximum inlet concentration of CO2 was 3 vol%. The most important factors were the reaction surface area, inlet gas velocity, inlet CO2 concentration, absorbent solution flow rate, inlet gas temperature and calcium hydroxide slurry concentration. The experimental results indicated that the CO2 removal efficiency increased when increasing the effective surface area of the reaction. Moreover, the removal efficiency increased by decreasing the input gas flow rate and inlet CO2 concentration. By performing experiments under optimum conditions, the maximum obtained CO2 removal efficiency was 79%. Copyright © 2020 BCREC Group. All rights reserved 

Overview of Axial Compression Technology for Direct Capture of CO2

2013 ◽  
Vol 744 ◽  
pp. 392-395 ◽  
Author(s):  
Hao Xian Malcolm Chan ◽  
Eng Hwa Yap ◽  
Jee Hou Ho
Keyword(s):  
Axial Compression ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Co2 Concentration ◽  
Point Sources ◽  
Direct Capture ◽  
Rate Of Increase ◽  
Air Capture ◽  
Key Issues ◽  
And Storage

Carbon Capture and Storage (CCS) is one of the global leading methods that could potentially retard the speed of climate change. However, CCS on point sources can only slowdown the rate of increase of atmospheric CO2 concentration. In order to mitigate CO2 released by previous emissions, a more proactive alternative is proposed where CO2 is directly extracted and captured from air Direct Air Capture (DAC). This paper presents a technical overview from our current research of a novel DAC concept which features a phase of axial compression to adapt pre-capture atmospheric air to a level suitable for carbon capture. Also detailed in the paper is the feasibility study addressing several key issues: the energy consumption and overall capturing efficiency of the proposed DAC system.

CLINICAL OUTCOME AND COST COMPARISON OF CARPAL TUNNEL WOUND CLOSURE WITH MONOCRYL® AND ETHILON®: A PROSPECTIVE STUDY

Hand Surgery ◽  
2013 ◽  
Vol 18 (02) ◽  
pp. 189-192 ◽  
Author(s):  
Anis Dosani ◽  
Sameer K. Khan ◽  
Sheila Gray ◽  
Steve Joseph ◽  
Ian A. Whittaker
Keyword(s):  
Carpal Tunnel ◽  
Wound Closure ◽  
Unit Cost ◽  
Cost Effective ◽  
Cost Comparison ◽  
Absorbable Suture ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
A Prospective Study

This prospective non-randomised two-cohort study compares the use of an absorbable suture (Poliglecrapone [Monocryl]: Group A) and a non-absorbable suture (Polyamide [Ethilon]: Group B) in wound closure after elective carpal tunnel decompression. The primary outcome was scar cosmesis as assessed by the Stonybrook Scar Evaluation Scale (SBSES); the financial cost of wound closure was compared as a secondary outocome. All fifty patients completed follow-up. At six weeks, there was no significant difference in the two groups regarding scar tenderness (p = 0.5), although residual swelling was more evident in the absorbable group (p = 0.2). The mean SBSES score at six weeks was 4.72 in Group A, and 4.8 in Group B (p = 0.3). The unit cost per closed wound of Monocryl was three times than Ethilon (p < 0.05). Ethilon is thus cost-effective without compromising the cosmetic outcome, and we recommend using this as the preferred suture for closure of carpal tunnel wounds.

scholarly journals Interdisciplinary approach for full mouth rehabilitation: A Case Report

2016 ◽  
Vol 9 (6) ◽  
pp. 9 ◽  
Author(s):  
Jeaidi Al Zaid
Keyword(s):  
Case Reports ◽  
Interdisciplinary Approach ◽  
Cost Effective ◽  
Minimal Invasive ◽  
Missing Teeth ◽  
Step Procedure ◽  
Cost Effective Approach ◽  
Full Mouth Rehabilitation ◽  
Esthetic Dentistry ◽  
Front Tooth

The demand for esthetic dentistry is ever increasing. A beautiful smile is considered as a symbol of health and vitality is now looked upon as a status symbol. Discoloration of the front tooth may severely affect the confidence of the patient. The use of dental implant presents a conservative and esthetic method of replacing missing teeth. Bleaching is recommended as a minimal invasive and cost effective approach to change the color of the teeth. This case reports the step by step procedure for full mouth rehabilitation of an esthetically demanding patient.Keywords: Bleaching, Composites, Esthetics, Implant, Root canal treatment.

scholarly journals Immobilized Microalgae-Based Photobioreactor for CO2 Capture (IMC-CO2PBR): Efficiency Estimation, Technological Parameters, and Prototype Concept

Atmosphere ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1031
Author(s):  
Marcin Dębowski ◽  
Mirosław Krzemieniewski ◽  
Marcin Zieliński ◽  
Joanna Kazimierowicz
Keyword(s):  
Carbon Dioxide Emissions ◽  
Functional Model ◽  
Biomass Concentration ◽  
Co2 Concentration ◽  
Ambient Air ◽  
Co2 Uptake ◽  
Co2 Removal ◽  
Exhaust Gas ◽  
Technological Parameters ◽  
Efficiency Estimation

Microalgae-mediated CO2 sequestration has been a subject of numerous research works and has become one of the most promising strategies to mitigate carbon dioxide emissions. However, feeding flue and exhaust gas into algae-based systems has been shown to destroy chloroplasts, as well as disrupt photosynthesis and other metabolic processes in microalgae, which directly limits CO2 uptake. CO2 biosequestration in existing photobioreactors (PBRs) is also limited by the low biomass concentration in the growth medium. Therefore, there is a real need to seek alternative solutions that would be competitive in terms of performance and cost-effectiveness. The present paper reports the results of experiments aimed to develop an innovative trickle bed reactor that uses immobilized algae to capture CO2 from flue and exhaust gas (IMC-CO2PBR). In the experiment, ambient air enriched with technical-grade CO2 to a CO2 concentration of 25% v/v was used. The microalgae immobilization technology employed in the experiment produced biomass yields approximating 100 g DM/dm3. A relationship was found between CO2 removal rates and gas volume flux: almost 40% of CO2 was removed at a feed of 25 dm3 of gas per hour, whereas in the 200 dm3/h group, the removal efficiency amounted to 5.9%. The work includes a determination of basic process parameters, presentation of a developed functional model and optimized lighting system, proposals for components to be used in the system, and recommendations for an automation and control system for a full-scale implementation.

scholarly journals EFFICACY OF LATERAL WEDGING IN FOOTWEAR IN MEDIAL COMPARTMENT OSTEOARTHRITIS KNEE

2019 ◽  
pp. 1-3
Author(s):  
Suman Badhal ◽  
U. Singh ◽  
S. L Yadav ◽  
Gita Handa
Keyword(s):  
Intervention Group ◽  
Cost Effective ◽  
Mean Difference ◽  
Medial Compartment ◽  
Treatment Modalities ◽  
Rank Test ◽  
P Value ◽  
Knee Oa ◽  
The Mean ◽  
Group B

INTRODUCTION: In Knee osteoarthritis (OA) Shoe modifications, such as lateral-wedge insoles or shock absorbing shoes with insoles, have been recommended for conservative therapy of mild knee OA but with little objective data on Indian patients. OBJECTIVE : this prospective study was done to study the effect of lateral heel sole wedging (insole) in the patients of OA of knee (medial compartment) and its relation to function,pain and stiffness parameters status on VAS and WOMAC scale and to see the requirement of the number of Aceclofenac tablets. METHODS: 60 patients fulfilling the inclusion criteria were enrolled and divided into intervention group A (30) and nonintervention Group B (30) with random allocation.Paired t-test,Wilcoxon sign rank test and Man Whitney U test were applied at significant p-value of <0.05%. RESULTS: the reduction of mean difference in pain on VAS and WOMAC scale, improvement in Mean difference in function parameters the mean reduction of pain in standing/ walking,bending and ascending/descending at WOMAC scale was significantly higher in intervention group. Also the mean reduction in the need for aceclofenac was significantly lower in intervention group evident from fourth week onward to fifth and sixth week.Conclusion:The lateral wedging in shoes in medial joint osteoarthritis is beneficial and it can be cost-effective conservative treatment modalities in early osteoarthritis patients, particularly in developing countries as it can reduces the requirement of NSAIDS and improve functional level of patients by reducing pain in various activities.

scholarly journals Comparative study of endoscopic tympanoplasty and conventional tympanoplasty

2020 ◽  
Vol 6 (10) ◽  
pp. 1804
Author(s):  
Priyanka Aggarwal ◽  
Barjinder Singh Sohal ◽  
J. P. Goyal
Keyword(s):  
Success Rate ◽  
Cost Effective ◽  
Patient Comfort ◽  
Hearing Improvement ◽  
Post Operation ◽  
Group A ◽  
Group B ◽  
The Cost ◽  
Results Of Surgery ◽  
Endoscopic Tympanoplasty

<p><strong>Background:</strong> To compare the results of endoscopic tympanoplasty with that of conventional tympanoplasty and to evaluate and compare the graft uptake in both of these methods. The study was done to evaluate the improvement in hearing after tympanoplasty and the problems faced while doing the endoscope assisted tympanoplasty.</p><p><strong>Methods: </strong>Between July 2010 to June 2013, 50 patients underwent tympanoplasty, 25 were endoscope assisted (group A) and 25 were microscope assisted (group B). Results of surgery were compared at the end of three and six months post operation.</p><p><strong>Results: </strong>The success rate in terms of graft uptake rate was 88% with endoscope assisted tympanoplasty and 84% with other microscope assisted tympanoplasty. Overall success rate was 86.0%. Mean hearing improvement was (16.24±10.21 dB) and (14.28±7.10 dB) in group A and group B respectively.</p><p><strong>Conclusions: </strong>Tympanoplasty with its visualization of hidden corners, justifies tympanoplasty by using endoscope in selected cases with comparable improved results in the literature. Furthermore, the cost of the endoscope is much less (about 10%) in comparision to operating microscope, making it more cost effective in developing countries. However, the endoscope cannot be employed in every case as one hand is blocked. In terms of Patient comfort, the endoscope assisted outnumbers the benefits of other conventional methods.<strong></strong></p>

scholarly journals A study to assess functional outcome of cemented and uncemented total hip replacement in a tertiary care center

2019 ◽  
Vol 5 (5) ◽  
pp. 828
Author(s):  
Kunal Ajitkumar Shah ◽  
Mohan Madhav Desai
Keyword(s):  
Functional Outcome ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Cost Effective ◽  
Harris Hip Score ◽  
Total Hip ◽  
Vas Score ◽  
Group A ◽  
The Difference ◽  
Group B

<p class="abstract"><strong>Background:</strong> Total hip replacement (THR) is the most successful and cost effective treatment with aim of pain relief and functional rehabilitation for hip disorders. As the implant designs of THR have evolved over time, the functional outcome and survivorship has improved. Even after so many advancements, it remains unclear that which implants are better, uncemented or cemented. Hence, we took up this study to analyze which of the uncemented or cemented THR have better functional outcome.</p><p class="abstract"><strong>Methods:</strong> This was a longitudinal study conducted during 2014 to 2018. Hundred cases were randomized into groups of 50 each. All patients with age between 55-80 years in whom THR was indicated were included in the study. Uncemented THR was done in Group A and cemented THR was done in Group B. Patients were followed up at 12 weeks, 6 months, 12 months, and 3 years. At follow-up, functional examination in terms of visual analogue scale (VAS) score and Harris hip score (HHS) was done.<strong></strong></p><p class="abstract"><strong>Results:</strong> The mean age of patients in Group A (uncemented) and Group B (cemented) was 62.5 years and 60 years respectively. We found that the difference of VAS score and HHS between Group A and B was statistically significant at 12 weeks and 6 months. The difference of VAS and HHS scores between Group A and B at 12 months and 3 years was not significant.</p><p class="abstract"><strong>Conclusions:</strong> We conclude that cemented THR has better functional outcome at short term. They are cost effective option at age ≥55-60 years.</p>

Particle mixing in a fluidized bed containing baffles

1975 ◽  
Vol 29 (4) ◽  
pp. 1264-1269 ◽  
Author(s):  
N. V. Kuzichkin ◽  
I. P. Mukhlenov ◽  
A. T. Bartov ◽  
A. N. Prokopenko
Keyword(s):  
Fluidized Bed ◽  
Particle Mixing

scholarly journals Cost-Effectiveness of Universal Prophylaxis in Pregnancy with Prior Group B Streptococci Colonization

2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
Mark A. Turrentine ◽  
Mildred M. Ramirez ◽  
Joan M. Mastrobattista
Keyword(s):  
Early Onset ◽  
Positive Culture ◽  
Cost Effective ◽  
Decision Analysis Model ◽  
Analysis Model ◽  
Group B Streptococci ◽  
Neonatal Deaths ◽  
History Of ◽  
Group B ◽  
Universal Treatment

Objective. To estimate the costs and outcomes of rescreening for group B streptococci (GBS) compared to universal treatment of term women with history of GBS colonization in a previous pregnancy.Study Design. A decision analysis model was used to compare costs and outcomes. Total cost included the costs of screening, intrapartum antibiotic prophylaxis (IAP), treatment for maternal anaphylaxis and death, evaluation of well infants whose mothers received IAP, and total costs for treatment of term neonatal early onset GBS sepsis.Results. When compared to screening and treating, universal treatment results in more women treated per GBS case prevented (155 versus 67) and prevents more cases of early onset GBS (1732 versus 1700) and neonatal deaths (52 versus 51) at a lower cost per case prevented ($8 805 versus $12 710).Conclusion. Universal treatment of term pregnancies with a history of previous GBS colonization is more cost-effective than the strategy of screening and treating based on positive culture results.

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