Effective removal of particulate matter from air by using zeolite-coated filters

2020 ◽  
Vol 8 (35) ◽  
pp. 17960-17968 ◽  
Author(s):  
Dong Kyu Yoo ◽  
Ho Chul Woo ◽  
Sung Hwa Jhung
Keyword(s):  
Particulate Matter ◽  
Pressure Drop ◽  
Removal Efficiency ◽  
Effective Removal ◽  
Pm Removal ◽  
Better Than

Zeolites are very effective (much better than MOFs) in removal of particulate matter (PM) from air; NaX/cotton showed 3.6-times the PM removal efficiency of bare cotton with a small increase in the pressure drop of 9 Pa.

A lottery draw machine-inspired movable air filter with high removal efficiency and low pressure drop at a high flow rate

2019 ◽  
Vol 7 (11) ◽  
pp. 6001-6011 ◽  
Author(s):  
Nara Han ◽  
Yo Seph Lee ◽  
Byung Kwon Kaang ◽  
Wooree Jang ◽  
Hye Young Koo ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Pressure Drop ◽  
Electric Field ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Low Pressure ◽  
High Flow ◽  
High Electric Field ◽  
High Flow Rate ◽  
Air Filter

A lottery draw machine-inspired novel movable air filter (MAF) system is presented in which MAFs are vigorously moved or rotated to form a high electric field and capture particulate matter (PM) particles.

scholarly journals Experimental Study on the Removal of Real Exhaust Pollutants from a Diesel Engine by Activated Carbon

2019 ◽  
Vol 9 (15) ◽  
pp. 3175 ◽  
Author(s):  
Zongyu Wang ◽  
Hailang Kuang ◽  
Jifeng Zhang ◽  
Lilin Chu ◽  
Yulong Ji
Keyword(s):  
Activated Carbon ◽  
Pressure Drop ◽  
Removal Efficiency ◽  
Industrial Applications ◽  
Pollutant Removal ◽  
Exhaust Gas ◽  
Excessive Pressure ◽  
Secondary Pollution ◽  
Pm Removal ◽  
Thermal Stability Of

So far, most of the experimental researchers studying the removal of diesel exhaust pollutants have done so with simulated exhaust gas, which cannot demonstrate the ability of catalysts accurately. Because activated carbon (AC) has low price, no secondary pollution, good adsorption performance, and certain catalytic activity, it has good application prospects in the field of marine exhaust pollutant removal. In this paper, the removal of particulate matter (PM), carbon monoxide (CO), and NOx from real exhaust gas by AC was studied. The results show that PM removal efficiency reached up to 77%, while the pressure drop increased with running time. AC may degenerate to some extent with the increase of temperature, resulting in a negative removal efficiency of CO. The denitration efficiency of AC was up to 34.5% without urea, and further increased to 44.8% after spraying urea, still a distance from industrial applications. In the future, it may be necessary to install a fan to compensate the reactor or to backwash the reactor to avoid excessive pressure drop. The thermal stability of the AC also needs to be improved. To increase the denitration performance, it may be helpful to modify the AC or impregnate other metal oxides.

scholarly journals Field Evaluation of an Electrostatic Air Filtration System for Reducing Incoming Particulate Matter of a Hen House

2018 ◽  
Vol 61 (1) ◽  
pp. 295-304 ◽  
Author(s):  
Yang Zhao ◽  
Lilong Chai ◽  
Brad Richardson ◽  
Hongwei Xin
Keyword(s):  
Particulate Matter ◽  
Field Study ◽  
Removal Efficiency ◽  
Sampling Period ◽  
Low Grade ◽  
Air Filtration ◽  
Late Fall ◽  
Filtration System ◽  
Pm Removal ◽  
The U.S

Abstract. As a result of the unprecedented highly pathogenic avian influenza (HPAI) outbreak in the U.S. in 2014-2015, some egg producers in the U.S. started using inlet air filtration to reduce the risk of disease transmission by air into hen houses. The removal efficiency of particulate matter (PM), the carrier of airborne pathogens, by such filtration systems has not been investigated. Therefore, this field study was conducted to evaluate the PM removal efficacy of an electrostatic air filtration system (consisting of a low-grade air filter and an electrostatic particle ionization, or EPI, system) installed at the inlet of a commercial high-rise hen house. The evaluation was performed in two test rounds over a one-year period. Results showed that average PM removal efficiencies in round 1 (spring to summer) and round 2 (late fall to spring) were respectively 66% and 29% for PM1, 66% and 30% for PM2.5, 66% and 31% for PM4, 68% and 36% for PM10, and 68% and 45% for total PM. Removal efficiency became unstable when the EPI system was inactive (i.e., when solely relying on the filter for PM removal). House static pressure and ventilation rate indicated considerable clogging of the filter media by dust accumulation and the need for replacement after ~16 weeks of use in the spring-to-summer sampling period (round 1); however, clogging was not an issue during the entire late fall-to-spring sampling period (24 weeks, round 2). The appearance of the filter changed gradually as dust accumulated with time, which can be captured by image analysis and used to judge filter dirtiness and lifespan. The findings of this field study provide insight into the efficacy of PM removal by such a low-cost air filtration system, which will help egg producers in their decision-making for disease prevention strategies. Keywords: Electrostatic particle ionization, Filtration, Hen house, Particulate matter, Reduction.

scholarly journals High-Performance Washable PM2.5 Filter Fabricated with Laser-Induced Graphene

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5551
Author(s):  
Anh-Phan Nguyen ◽  
Won-Kyu Kang ◽  
Jung-Bae Lee ◽  
Jung-Bin In
Keyword(s):  
Particulate Matter ◽  
Pressure Drop ◽  
Removal Efficiency ◽  
High Performance ◽  
Tap Water ◽  
Air Cleaning ◽  
Cleaning Agents ◽  
Single Side

This study demonstrates a novel application of laser-induced graphene (LIG) as a reusable conductive particulate matter (PM) filter. Four types of LIG-based filters were fabricated based on the laser-induced pyrolysis of thin polyimide (PI) sheets, each pyrolyzed on either a single side or both sides, with or without densification. The LIG filters exhibited a high removal efficiency while maintaining minimal pressure drop compared to a commercial fiberglass filter. The densified LIG (dLIG) filters displayed a higher PM2.5 removal efficiency (>99.86%) than regular LIG filters. The dLIG filters also exhibited excellent durability when tested for washability by ultrasonication in tap water. After being cleaned and left to dry, the structures of the dLIG filters were well-maintained; their filtration efficiencies were also well-maintained (less than a 7% change in PM2.5 removal efficiency), and their resistances only marginally increased (less than a 7% increase after five uses). These results demonstrate the robustness and reusability of the dLIG filters and the accessibility of their cleaning (not requiring aggressive cleaning agents). These promising features will enable the application of LIG in economical, scalable, and high-performance air cleaning.

The assessment of particulate matter (PM2.5) removal efficiency on air cleaner products through full scale test in Korea

2019 ◽  
Vol 18 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Kichul Kim ◽  
Pil-Ju Park ◽  
Soomi Eo ◽  
Seungmi Kwon ◽  
Kwangrae Kim ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Removal Efficiency ◽  
Full Scale ◽  
Full Scale Test ◽  
Air Cleaner ◽  
Scale Test

Evaluation of a tropical single-cell waste stabilization pond system for irrigation

1995 ◽  
Vol 31 (12) ◽  
pp. 267-273 ◽  
Author(s):  
B. S. O. Ceballos ◽  
A. Konig ◽  
B. Lomans ◽  
A. B. Athayde ◽  
H. W. Pearson
Keyword(s):  
Single Cell ◽  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Full Scale ◽  
Waste Stabilization Pond ◽  
North East ◽  
Helminth Eggs ◽  
Waste Stabilization ◽  
Better Than

A single full-scale primary facultative pond in Sapé, north-east Brazil was monitored for performance and efficiency. The pond had a hydraulic retention time of 61 days and achieved a 95% BOD5 removal efficiency and had no helminth eggs in the effluent. The effluent failed to meet the WHO faecal coliform guideline for unrestricted irrigation. The pond was dominated by the cyanobacterium Microcystis and gave better than predicted orthophosphate removal. Details of how the system could be simply upgraded utilizing the same land are discussed.

Thermohydraulics of Laminar Flow Through Rectangular and Square Ducts With Transverse Ribs and Twisted Tapes

2006 ◽  
Vol 128 (10) ◽  
pp. 1070-1080 ◽  
Author(s):  
Debashis Pramanik ◽  
Sujoy K. Saha
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Laminar Flow ◽  
Laminar Flows ◽  
Short Length ◽  
Full Length ◽  
Twisted Tape ◽  
Twisted Tapes ◽  
Square Ducts ◽  
Better Than

The heat transfer and the pressure drop characteristics of laminar flow of viscous oil through rectangular and square ducts with internal transverse rib turbulators on two opposite surfaces of the ducts and fitted with twisted tapes have been studied experimentally. The tapes have been full length, short length, and regularly spaced types. The transverse ribs in combination with full-length twisted tapes have been found to perform better than either ribs or twisted tapes acting alone. The heat transfer and the pressure drop measurements have been taken in separate test sections. Heat transfer tests were carried out in electrically heated stainless steel ducts incorporating uniform wall heat flux boundary conditions. Pressure drop tests were carried out in acrylic ducts. The flow was periodically fully developed in the regularly spaced twisted-tape elements case and decaying swirl flow in the short-length twisted tapes case. The flow characteristics are governed by twist ratio, space ratio, and length of twisted tape, Reynolds number, Prandtl number, rod-to-tube diameter ratio, duct aspect ratio, rib height, and rib spacing. Correlations developed for friction factor and Nusselt number have predicted the experimental data satisfactorily. The performance of the geometry under investigation has been evaluated. It has been found that on the basis of both constant pumping power and constant heat duty, the regularly spaced twisted-tape elements in specific cases perform marginally better than their full-length counterparts. However, the short-length twisted-tape performance is worse than the full-length twisted tapes. Therefore, full-length twisted tapes and regularly spaced twisted-tape elements in combination with transverse ribs are recommended for laminar flows. However, the short-length twisted tapes are not recommended.

Evaluation Analysis of Prediction Methods for Two-Phase Flow Pressure Drop in Mini-Channels

2008 ◽  
Author(s):  
Licheng Sun ◽  
Kaichiro Mishima
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Turbulent Region ◽  
Frictional Pressure Drop ◽  
New Correlation ◽  
Mini Channels ◽  
Flow Pressure ◽  
Better Than

2092 data of two-phase flow pressure drop were collected from 18 published papers of which the working fluids include R123, R134a, R22, R236ea, R245fa, R404a, R407C, R410a, R507, CO2, water and air. The hydraulic diameter ranges from 0.506 to 12mm; Relo from 10 to 37000, and Rego from 3 to 4×105. 11 correlations and models for calculating the two-phase frictional pressure drop were evaluated based upon these data. The results show that the accuracy of the Lockhart-Martinelli method, Mishima and Hibiki correlation, Zhang and Mishima correlation and Lee and Mudawar correalion in the laminar region is very close to each other, while the Muller-Steinhagen and Heck correlation is the best among the evaluated correlations in the turbulent region. A modified Chisholm correlation was proposed, which is better than all of the evaluated correlations in the turbulent region and its mean relative error is about 29%. For refrigerants only, the new correlation and Muller-Steinhagen and Heck correlation are very close to each other and give better agreement than the other evaluated correlations.

Optimization of chemical and enzymatic deinking of photocopier waste paper

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 447-463 ◽  
Author(s):  
Puneet Pathak ◽  
Nishi K. Bhardwaj ◽  
Ajay K. Singh
Keyword(s):  
Physical Properties ◽  
Removal Efficiency ◽  
Strength Properties ◽  
Waste Paper ◽  
Cellulase Enzyme ◽  
Tensile Index ◽  
Drainage Time ◽  
Tear Index ◽  
The World ◽  
Better Than

The utilization of post-consumer papers in the production of new paper products is increasing all over the world in recent years. Recycling of photocopier paper is a major problem due to difficulty in removal of non-impact ink. Enzymes offer potential advantages in ecofriendly deinking of recovered paper. In this study the deinking of photocopier paper was examined using chemicals and a commercial cellulase enzyme. Parameters of deinking experiments were optimized for hydrapulping. The ink was removed by flotation and washing processes. Then these parameters were compared in terms of ink removal ability of the process, as well as optical and strength properties of the deinked paper. The application of enzymatic deinking improved ink removal efficiency by 24.6% and freeness by 21.6% with a reduction in drainage time of 11.5% in comparison to those obtained with chemical deinking. The physical properties, namely burst index and tensile index, were observed to improve by 15.3% and 2.7%, respectively and brightness and tear index decreased by 2.1% and 21.9%, respectively. Results of deinking efficiency of photocopier paper showed that the enzyme used in the present work performed better than the conventional chemicals used for deinking.

scholarly journals Honeycomb wet scrubber for acidic gas control: modeling and long-term test results

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Thi-Cuc Le ◽  
Gung-Hwa Hong ◽  
Guan-Yu Lin ◽  
Ziyi Li ◽  
David Y. H. Pui ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Removal Efficiency ◽  
Treatment Method ◽  
Acidic Gases ◽  
Potential Applications ◽  
Wet Scrubber ◽  
Predicted Height ◽  
Long Term Performance ◽  
Term Performance

AbstractA laboratory scale, 1.0 CMM (m3 min− 1) wet scrubber packed with water-absorbing honeycomb material (HWS) with a very large geometric surface area of 480 m2 m− 3 and a low pressure drop developed in our previous study was shown to achieve a very high removal efficiency for acidic gases but there were no long-term test data. In this study, the HWS scaled up to operate at a 100 CMM flow rate was tested for removing mixed acidic gases at a semiconductor fab for a very long period of 3.5 yr. Results showed that the removal efficiency for the mixed gases emitted from the fab always maintained as high as > 95% for HF, CH3COOH, HCl, HNO3, HNO2, and H2SO4 with the inlet concentrations ranging from supper-ppmv to sub-ppmv, during a 3.5-yr period. With water jet cleaning of the honeycomb modules once per year, the pressure drop of the HWS remained to be low at 0.5–0.8 cm H2O, indicating minimal scaling in the HWS. Additionally, the predicted height and removal efficiencies of the HWS were very close to the experimental data. The excellent long-term performance of the HWS warrants its potential applications in many areas in which liquid absorption is the preferred treatment method and the theoretical equations can facilitate the design of the HWS.

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