scholarly journals Factors affecting the NO removal efficiency in the NO removal method by silent discharge

2002 ◽  
Vol 122 (9) ◽  
pp. 832-839 ◽  
Author(s):  
Tomoaki Shinkawa ◽  
Junpei Shimazaki ◽  
Kazuyoshi Sano ◽  
Yoshio Yoshioka
Keyword(s):  
Removal Efficiency ◽  
Silent Discharge ◽  
No Removal ◽  
Factors Affecting ◽  
Removal Method

scholarly journals Simultaneous removal of NOx and SO2 from simulated marine ship flue gas in a novel wet scrubbing system based on divided diaphragm seawater electrolysis technology: efficiency optimization and economic assessment

2021 ◽  
Vol 83 (5) ◽  
pp. 1230-1241
Author(s):  
Pijian Gong ◽  
Xinxue Li
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Economic Assessment ◽  
Active Chlorine ◽  
No Removal ◽  
Factors Affecting ◽  
Wet Scrubbing ◽  
Oxidation Tower ◽  
The Relationship ◽  
Seawater Electrolysis

Abstract This work constructed a divided diaphragm seawater electrolysis system with two tandem packed towers for the synergistic removal of NOx and SO2. The first tower was mainly used to oxidize NO and SO2 by AC (active chlorine), and the second tower was used to further absorb NOx. The factors affecting on NO removal, including ACC (active chlorine concentration), pH value, initial NO concentration and temperature in the oxidation tower were investigated. Moreover, the effect of different inlet gas concentrations and current values were explored. The results showed that with the increase of ACC, the NO and NOx removal efficiency increased rapidly, but when the ACC was higher than 500 mg/L [Cl2], the removal efficiency did not increase further in the oxidation tower. Low pH values in the oxidation tower were favorable for NO removal. NO removal efficiency reached a maximum at 40 °C. Higher NO and SO2 concentrations were favorable for NO removal. The decline of pH in the anode cell was not conducive to the storage of AC in the continuous electrolysis removal process. NOx and SO2 were almost completely removed after being scrubbed in the oxidation and absorption towers. The relationship between current and removal efficiency of NO and SO2 in the oxidation tower was also analyzed. Finally, the removal mechanism and the application prospects were discussed.

scholarly journals Study on the NO removal efficiency of the lignite pyrolysis coke catalyst by selective catalytic oxidation method

PLoS ONE ◽  
2017 ◽  
Vol 12 (8) ◽  
pp. e0182424 ◽  
Author(s):  
Lei Zhang ◽  
Xin Wen ◽  
Zhenhua Ma ◽  
Lei Zhang ◽  
Xiangling Sha ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Removal Efficiency ◽  
No Removal ◽  
Oxidation Method ◽  
Selective Catalytic Oxidation ◽  
Pyrolysis Coke

scholarly journals Factors affecting removal of bacterial pathogens from healthcare surfaces during dynamic wiping

2018 ◽  
Vol 89 (4) ◽  
pp. 580-589 ◽  
Author(s):  
NWM Edwards ◽  
EL Best ◽  
P Goswami ◽  
MH Wilcox ◽  
SJ Russell
Keyword(s):  
Removal Efficiency ◽  
Surface Density ◽  
Pathogenic Bacteria ◽  
Best Practice ◽  
Regenerated Cellulose ◽  
Extrinsic Factors ◽  
Factors Affecting ◽  
E Coli ◽  
Liquid Removal ◽  
Fabric Surface

Wiping of surfaces contaminated with pathogenic bacteria is a key strategy for combating the transmission of healthcare associated infections. It is essential to understand the extent to which removal of bacteria is modulated by fiber properties, biocidal liquid impregnation and applied hand pressure. The influence of intrinsic and extrinsic factors on the removal efficiencies of pathogenic bacteria was studied. Nonwoven wipes made of either hydrophobic (polypropylene) or hygroscopic (lyocell) fibers were manufactured and dynamic removal efficiency of bacteria studied. The single most important parameter affecting bacterial removal efficiency was impregnation with biocidal liquid ( p < 0.05). For inherently hygroscopic 100% regenerated cellulose (lyocell) wipes impregnated with biocidal liquid, removal of E. coli, S. aureus and E. faecalis improved by increasing the fabric surface density and wiping pressure to their maximal values – 150 g.m–2 and 13.80 kN.m–2, respectively. For inherently hydrophobic 100% polypropylene nonwoven wipes, the same conditions maximized the removal efficiency of S. aureus, but for E. coli and E. faecalis a reduction in the wiping pressure to 4.68 kN.m–2 was required. Best practice involves the use of higher surface density wipes (150 g.m–2) containing regenerated cellulose fibers loaded with liquid biocide, and applied with the greatest possible wiping pressure.

scholarly journals Performance Evaluation of Hybrid Air Purification System with Vegetation Soil and Electrostatic Precipitator Filters

2020 ◽  
Vol 12 (13) ◽  
pp. 5428
Author(s):  
Aya Elkamhawy ◽  
Choon-Man Jang
Keyword(s):  
Removal Efficiency ◽  
Electrostatic Precipitator ◽  
Fine Particulate Matter ◽  
Air Purification ◽  
High Concentration ◽  
Air Velocity ◽  
Removal Method ◽  
Purification System ◽  
Reduction Efficiency ◽  
Individual Module

This paper describes designing, manufacturing, and evaluating an eco-friendly modular-type air purification system to enhance the removal efficiency of fine particulate matter (PM) in urban public spaces, especially in hotspots. This system consists of artificial soil based-vegetation and electrostatic precipitator (ESP) filters. Unlike the so-called passive removal method, which adsorbs fine PM only by the leaves of plants, the vegetation soil filter based on multi-layered different artificial soils adopts an active removal method in which air purification is performed in the soil itself, bypassing external air by using the air circulation fan in the soil. The ESP filter is designed and evaluated to have a high fine PM removal efficiency, even at high suction velocity, to remove large amounts of outdoor fine PM. Throughout the experimental measurements on the hybrid air purification system with vegetation soil and ESP filters, it is observed that the vegetation soil filter has a 78.5% reduction efficiency for PM2.5 and a 47% for PM10 at the inlet air velocity of 0.15 m/s. The ESP filter also has a 73.1% reduction efficiency for PM2.5 and 87.3% for PM10 at an inlet air velocity of 3 m/s. Based on the performance evaluations of the vegetation soil filter and the ESP filter, it is noted that each individual module will be applied to an air purification tower with vertical expansion and installed in a high concentration area of fine PM in a downtown area to contribute to the fine PM reduction in the community.

Study on the Experiments of Flue Gas Denitrification and Desulfurization Using Nitric Acid Solution

2008 ◽  
Author(s):  
Bao-Ming Sun ◽  
Shui-E Yin ◽  
Zhong-Li Wang
Keyword(s):  
Nitric Acid ◽  
Oxygen Concentration ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Nitric Acid Concentration ◽  
Nox Removal ◽  
No Removal ◽  
Nox Removal Efficiency ◽  
The Individual ◽  
So2 Concentration

The present study attempts to take nitric acid as absorbent to clean up SO2 and NO gases simultaneously from the simulated flue gas in the lab-scale bubbling reactor, this study was divide into the individual DeNOx experiments and the combined DeSOx/DeNOx experiments: the individual DeNOx experiments were carried out to examine the effect of various operating parameters such as input NO concentration, nitric acid concentration, oxygen concentration input SO2 concentration, adding KMnO4 as additive and taking NaOH as the secondary absorption processes on the SO2 and NOx removal efficiencies at room temperature, the results of the individual DeNOx show that NO removal efficiency of 70%–95% were achieved under optimized conditions. NO removal efficiency increased with the increasing nitric acid concentration and increased by adding KMnO4 into the absorbent as additive as well. The removal efficiency of NO can reach 95% when using the two-step integrated processes of (HNO3+KMnO4)-NaOH, the absorption solution of 50% nitric acid, 400ppm of input NO concentration. 0.5% oxygen concentration and without SO2 in the simulated flue gas. No improvement on the NOx removal efficiency was observed with the increasing of KMnO4 and NaOH concentration in the scrubbing solution. The results of the combined DeSOx/DeNOx experiments show that the maximum DeNOx and DeSOx efficiencies ranged from 36.6% to 81% and from 99.4% to 100.0%, respectively. The prime parameters affecting the NOx removal efficiency are the oxygen concentration and the input SO2 concentration.

Microwave-Induced Catalytic Removal of Hazardous Gases

2015 ◽  
Vol 1092-1093 ◽  
pp. 882-885
Author(s):  
Huan Zhou ◽  
Zhen Xing Cheng ◽  
Nan Wang ◽  
Hong Peng Zhang ◽  
Hua Min Tang
Keyword(s):  
Removal Efficiency ◽  
Flow Rate ◽  
Microwave Field ◽  
Factors Affecting ◽  
Catalyst Type ◽  
Hazardous Gases ◽  
Main Factors ◽  
Set Up ◽  
Catalytic Removal ◽  
Hazardous Gas

A microwave-induced catalytic removal device was designed and set up for studying removal of hazardous or toxic gas from contaminated air. Catalytic oxidative Removal ratios of several hazardous gases of VOCs, CO and H2under microwave field were tested. Results suggested that structure of hazardous gas and catalyst type were main factors affecting the removal efficiency of hazardous gas. Oxidative catalyst contributed to removal of reductive gas. In addition, the flow rate also affected the removal efficiency.

NO removal efficiency of high-yield carbon nitride irradiated under various light sources

2018 ◽  
Vol 73 ◽  
pp. 83-91 ◽  
Author(s):  
Zhenzhen Lu ◽  
Dong Liu ◽  
Zhiyuan Yang ◽  
Jianting Zhou
Keyword(s):  
Removal Efficiency ◽  
Carbon Nitride ◽  
High Yield ◽  
Light Sources ◽  
No Removal

The Characteristics of NO Reduction in the Reactor With Dielectric Barrier Discharge

2009 ◽  
Author(s):  
Bao-Ming Sun ◽  
Shui-E Yin
Keyword(s):  
Dielectric Barrier Discharge ◽  
Oxygen Content ◽  
Removal Efficiency ◽  
Barrier Discharge ◽  
Nitrogen Atmosphere ◽  
Discharge Power ◽  
Gas Velocity ◽  
Dielectric Barrier ◽  
No Removal ◽  
Removal Efficiencies

The conventional techniques, which are being used to clean the flue gases such as catalytic reduction method for NO removal, wet and dry scrubbers for SO2 removal and ESP for particulate removal, are becoming more expensive and less suitable for small plants and mobile emission sources. Non-thermal plasma (NTP) techniques utilizing electrical discharges give an innovative approach for economical solution of gas cleaning. The studies present recent work on applying the electrical discharge plasma technology for treating gaseous pollutants, in general, and nitric oxide, in particular, as this is one of the major contributors to air pollution. The present works focuses attention on dielectric barrier discharge technique for nitric oxide removal from simulated gas compositions and investigate the effect of various operating parameters on the NO removal efficiencies at room temperature. The effects of various parameters, viz. discharge power, gas velocity, initial NO concentration (ppm), gas mixture composition, etc., on NO removal efficiency are discussed. Studies are divided into two parts: in the nitrogen atmosphere and argon atmosphere respectively, in order to investigate the effect of various operating parameters on the NO removal efficiencies at room temperature. The results in nitrogen atmosphere indicate that the influence of the discharge power, oxygen content and different initial concentration on NO removal efficiency are also studied. Conclusion that increasing discharge power is in favor of the NO removal. Adding oxygen reduce the NO removal efficiency significantly, and changing the NO initial concentration effected on NO removal efficiency but nor as good as the factors of discharge power, oxygen content. In the argon atmosphere, the dielectric barrier discharge require lower voltage level. The effect of the discharge power, gas velocity and oxygen content on NO removal efficiencies are studied and some conclusions be obtained, increasing discharge power and lowing flue gas velocity would conducive to removal, adding oxygen would hinder the removal of NO. Further result and comparative study of various cases be presented in this paper.

Efficient Removal of Lead and Cadmium ions by Titanate Nanotubes Prepared at Different Hydrothermal Conditions

2018 ◽  
Vol 15 (2) ◽  
pp. 197-208 ◽  
Author(s):  
Maha A. Alwaili ◽  
Heba Allah M. Elbaghdady ◽  
Ayman H. Zaki ◽  
Mohammed A. Sallam
Keyword(s):  
Electron Microscopy ◽  
Removal Efficiency ◽  
Contact Time ◽  
Titanate Nanotubes ◽  
Bet Surface Area ◽  
Efficient Removal ◽  
Hydrothermal Conditions ◽  
Factors Affecting ◽  
Lead And Cadmium ◽  
Ph Range

Background: Nanotubes serve an important role in heavy metal ions for the removal from wastewater. The efficiency of these nanotubes is dependent on the nature of surface, pH, temperature setting and the hydrothermal contact time. Method: The current research sought to find out the efficiency of titanate nanotubes in the removal of Pb2+ and Cd2+ ions from wastewater. The research concentrated on mesoporosity, pH and hydrothermal contact time, as factors affecting the efficiency of titanate nanotubes in the removal of Pb2+ and Cd2+ ions. Titanate nanotubes were prepared at different hydrothermal conditions, the prepared nanotubes were used for efficient removal of Pb2+ and Cd2+. The following technologies were utilized in the research: (1). electron microscopy (FESEM), (2). X-ray diffraction (XRD), (3). highresolution transmission electron microscopy (HRTEM), (4). FTIR and BET surface area were measured by N2 adsorption using Micrometrics TriStar II. Results: The results obtained reveal that increasing the hydrothermal time improved the adsorption efficiency of the prepared material, where the Titanate nanotubes prepared at the longest time (23hr) achieved the highest removal efficiency for both Pb2+ and Cd2+ at pH 2 and pH 3, respectively. The nanotubes prepared at different conditions also showed significant activities, where the removal % exceeded 90 % for all samples at a pH range of 2 to 3. It was conducted that the factors that affected the efficiency could be set at optimum and the removal efficiency attained be increased, to more than 90%.

Application of Ozone in the Treatment of Nitric Oxide from Simulated Flue Gas

2013 ◽  
Vol 838-841 ◽  
pp. 2663-2666
Author(s):  
Xu Jie Lu
Keyword(s):  
Nitric Oxide ◽  
Removal Efficiency ◽  
Reaction Temperature ◽  
Flue Gas ◽  
Experimental Results ◽  
Molar Ratio ◽  
No Removal ◽  
Operating Condition ◽  
Molar Ratios

The objective of this work was to study the effect of some operating condition on the removal of NO from simulated flue gas in the lab-scale agitated bubbling reactor. The experimental results showed that NO removal efficiency went up with the increase in the molar ratios of O3/NO and the NO removal efficiency reached 92% at 3 of molar ratio. It can also be found that the average removal efficiency was slightly affected by the reaction temperature and almost retained over 75%.

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