scholarly journals FINE PARTICLE REMOVAL USING HYDROPHOBIC MICROPOROUS POLYMERIC MEMBRANES

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
Anita Kusuma Wardani ◽  
Ivan Ivan ◽  
Ivan Ruben Darmawan ◽  
Khoiruddin Khoiruddin ◽  
I Gede Wenten
Keyword(s):  
Removal Efficiency ◽  
Fine Particle ◽  
Fine Particles ◽  
Low Cost ◽  
Polymeric Membrane ◽  
Particle Removal ◽  
Air Filtration ◽  
Air Filter ◽  
Aerodynamic Properties ◽  
The World

The air quality in the world has been worsening in the last decades due to industrial, vehicle, cigarettes smoke, forest fire, and fuel usage. In this case, fine particles are the world’s greatest concern due to its aerodynamic properties which enable it to travel throughout the world. The current conventional technologies seem to have lost their reliability due to complexity, low removal efficiency, and high equipment cost. Membrane air filter brings new hope to answer this challenge. It gives high removal efficiency with an acceptable pressure drop to fulfill the need for clean air at a lower price. Recently, the introduction of nanofibre membrane as a low-cost membrane may broaden membrane application in air filtration. Compared to conventional membrane, nanofibre membrane offers some interesting features such as higher porosity, interconnected pore structure, and narrow pore size distribution that provide remarkable permeability. In this paper, the microporous polymeric membrane for air filtration especially for fine particles removal is reviewed including mechanism of fine particle removal, membrane preparation, and factor affecting filtration performance.

The Research of Splitting Craft for Air Filter with Sea-Island Superfine Fiber Needled Fabrics

2013 ◽  
Vol 303-306 ◽  
pp. 2567-2571 ◽  
Author(s):  
Ling Xiao Jing ◽  
Sheng Sun ◽  
Xin Wang ◽  
Cai Qian Zhang
Keyword(s):  
Loss Rate ◽  
High Efficiency ◽  
Fine Particles ◽  
Orthogonal Design ◽  
Low Cost ◽  
Dust Collector ◽  
Air Filter ◽  
Ultra Fine Particles ◽  
Superfine Fiber ◽  
Splitting Time

Although the bag-type dust collector is dust capture equipment which is low cost and high efficiency, it has less filter efficiency to ultra fine particles for its of thicker fiber. So ultrafine fiber were used by bicomponent fiber with splitting craft to improve the filtration efficiency of ultra fine particles greatly. A piece of polyester/nylon sea-island superfine fiber needled nonwovens were splitted processing for nine times by the orthogonal design. And fibre microscopic photographs, weight loss rate and strength were analyzed. The best choice of splitting craft as followed: lye concentration is 16%, splitting time 15 min and splitting temperature is 95 °C.

A Dynamics-Agnostic State Estimator for Unmanned Aerial Vehicles Using Ultra-Wideband Radios

2018 ◽  
Author(s):  
Mark W. Mueller
Keyword(s):  
Dynamic Properties ◽  
Low Cost ◽  
Ultra Wideband ◽  
State Estimator ◽  
System Parameters ◽  
Aerodynamic Properties ◽  
Mass Moment ◽  
The World ◽  
Mass Moment Of Inertia ◽  
Wideband Radio

We present a state estimator for a UAV operating in an environment equipped with ultra-wideband radio beacons. The beacons allow the UAV to measure distances to known positions in the world. The estimator additionally uses the vehicle’s rate gyroscope and accelerometer, and crucially does not rely on any knowledge of the vehicle’s dynamic properties (e.g. mass, mass moment of inertia, aerodynamic properties). This makes the estimator especially useful in situations where the exact system parameters are unknown (e.g. due to unknown payloads), or where the environment is unpredictable (e.g. wind gusts). Experimental results demonstrate the approach’s efficacy, and demonstrate that the estimator can run on low-cost microcontrollers with typical sensors.

scholarly journals PVP-Assisted Shellac Nanofiber Membrane as Highly Efficient, Eco-Friendly, Translucent Air Filter

2021 ◽  
Vol 11 (23) ◽  
pp. 11094
Author(s):  
Shanshuai Lu ◽  
Congling Li ◽  
Rui Liu ◽  
Aifeng Lv
Keyword(s):  
Mechanical Properties ◽  
Low Cost ◽  
Light Transmittance ◽  
Liquid Droplets ◽  
Air Filtration ◽  
Nanofiber Membrane ◽  
Air Filters ◽  
Air Filter ◽  
Highly Efficient ◽  
Pm2.5 And Pm10

Particulate matter (PM), composed of tiny solids and liquid droplets in polluted air, poses a serious threat to human health. Traditional air filters usually cause secondary pollution due to their poor degradability. Here, shellac, as an environmentally friendly natural organic material, was successfully applied to fabricate biodegradable air filters. Since pure shellac fiber shows poor mechanical properties and bad light transmittance, we then introduced a small amount of polyvinylpyrrolidone (PVP) in the shellac solution to prepare highly efficient air filter membranes by the electrospinning method. The prepared PVP-assisted shellac nanofiber membrane (P-Shellac FME) demonstrated improved filtration efficiencies as high as 95% and 98% for PM2.5 and PM10, respectively. The P-Shellac FME also showed good stability, with filtration efficiencies still above 90% and 95% for PM2.5 and PM10 even after six hours of air filtering under high PM concentrations. The pressure drop going through the filter was only 101 Pa, which is also comparable to the value of 76 Pa obtained using commercial polypropylene nanofibers (PP nanofibers, peeled off from the surgical mask), indicating good air permeability of P-Shellac FME. Additionally, P-Shellac FME also showed the advantages of translucence, biodegradability, improved mechanical properties, and low cost. We believe that the P-Shellac FME will make a significant contribution in the application of air filtration.

Application in Up-Flow Filtration of Filter Material for Urban Stormwater Control

2007 ◽  
Vol 544-545 ◽  
pp. 517-520
Author(s):  
B.G. Kim ◽  
H.J. Park ◽  
Byung Cheol Lee
Keyword(s):  
Removal Efficiency ◽  
Fine Particles ◽  
Filter Material ◽  
Particle Removal ◽  
Urban Stormwater ◽  
Bottom Part ◽  
Initial Stage ◽  
Flow Filtration ◽  
Filter Bed ◽  
Filtration Device

In this research, a up-flow filtration device was developed for the on-site treatment of urban stormwater runoff during storm events, and particle removal characteristic of porous polypropylene as a filter material was experimentally examined. The up-flow filtration device showed high removal efficiency, more than 90% (mainly 95-98%) of the SS concentration of influent particles. After the sedimentation in the bottom part of up-flow filtration device, the up-flow filtration filled with porous polypropylene material was able to remove more over 70% of the SS concentration in the up-flow. The increase rate of captured particle amount retained in 10, 20 cm from the bottom of filter bed was lower while flow rate increased. This is attributed to the fact that fine particles detached or not removed by the bottom of filter bed were mainly retained in that section. The particles (mainly finer particles) captures were increased by those particles (mainly large particles) retained in the initial stage for influent particles. However, the improvement of particle removal efficiency (as SS concentration) was not observed along with this phenomenon. The reason may relate to the fact that the particles retained by the captured particles in the initial stage were fine particles.

scholarly journals Adsorption of Iron with Biosorbents derived from Longan Peel, Pomelo Peel and Jackfruit Peel

2021 ◽  
Vol 945 (1) ◽  
pp. 012057
Author(s):  
Yi Jun Chai ◽  
Yee Sern Ng ◽  
Katrina Pui Yee Shak ◽  
Law Yong Ng
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Adsorption Process ◽  
Low Cost ◽  
Batch Adsorption ◽  
Pomelo Peel ◽  
Positive Ions ◽  
Carboxylate Groups ◽  
The World ◽  
Initial Ph

Abstract High iron (Fe2+) concentration in groundwater is a severe issue in many regions of the world. This study attempts to investigate the effectiveness of biosorbents derived from longan peel (LP), pomelo peel (PP) and jackfruit peel (JP) for the adsorption of Fe2+ from aqueous solution in various forms. A batch adsorption study was carried out with an initial Fe2+ concentration of 10 mg/L for 2 h. The results showed that the highest removal efficiency was achieved for PP and its biochar at 97.38% and 99.45%, respectively. High removal efficiency implied that PP contained favourable characteristics for the adsorption of Fe2+. Under the scanning electron microscope (SEM), the surface structure of PP displayed visible dimensions with a relatively large pore size compared with LP and JP. Characterisation study using Fourier-transform infrared spectroscopy (FTIR) reveals that the carboxylate groups and ester carbonyl band participated in the adsorption process. At higher initial pH of 5.83, adsorption of Fe2+ using PP gives higher removal efficiency due to lower competition on electrostatic interaction between positive ions in the solution and the surface of biosorbents. Furthermore, adsorption uptake of 83.0 mg/g was attainable with an initial concentration of 100 mg/L. This study has proven the feasibility of PP as a low cost biosorbents for removing Fe2+ in an aqueous solution.

Study of a polyaniline/polypropylene collecting electrode and its particle removal efficiency

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75038-75044 ◽  
Author(s):  
Gengen Kang ◽  
Li Li ◽  
Wei Wang ◽  
Dan Yu
Keyword(s):  
Removal Efficiency ◽  
Fine Particles ◽  
Particle Removal ◽  
Conductive Polyaniline

In this study, we successfully prepared conductive polyaniline (PANI) on a polypropylene (PP) plate to produce novel collecting electrodes for the removal of fine particles.

The some results of study on outdoor and indoor ambient PM2.5

2018 ◽  
pp. 40-54 ◽  
Author(s):  
Byambatseren Ch ◽  
Michidmaa N ◽  
Sonomdagva Ch ◽  
Yutaka Matsumi
Keyword(s):  
Air Pollution ◽  
Fine Particle ◽  
Fine Particles ◽  
Quality Standard ◽  
Ambient Pollution ◽  
The World ◽  
Particle Pollution ◽  
Residential District ◽  
High Level ◽  
Indoor And Outdoor

In this study, PM2.5 pollution of indoor and outdoor ambience has been measured on a household which is located between the Ger area and the residential district at simultaneous duration and point. In order to analyze, we used n = 3,119,500 data which was measured at each 10 second during 24 hours period. The instrument that was used to study, created by Nagoya University and Panasonic Corporation. In recent years, the capital of Ulaanbaatar, Mongolia, is leading the air pollution during the winter in the world, and the majority of this pollution is comprised of PM2.5 . Fine particles are very harmful to human health, and people spend approximately 90% of their lives in the indoor ambient. Thus, it is important to measure continuously the amount of indoor and outdoor PM2.5, so we have selected two points and indicated some statistical analysis on indoor and outdoor ambient. The results of this study indicate the PM2.5 concentrations of air in Ulaanbaatar are higher than the air quality standard in October and peak in the December and January. Also, due to the feature of the sites being measured, pollution of indoor ambient was demonsrated strong or weak level, which is depended on outdoor ambient pollution. The measurements of the majority days were a high level of pollution from at 00:00 to 04:00 pm, however, it was decreased at 5:00 pm, but it started to increase around 07:00 to 09:00 in the morning, and it decreased from 10:00 am to low level of the pollution whole day. At 18 o’clock in the evening, the pollution was increasing and at the peak of the day, the fine particle pollution up to 02:00 on the next day.

scholarly journals Size Dependent Particle Removal Efficiency and Pressure Drop of a Dust Cleaning Material For Use as Facemask Filters for Protection during COVID-19

2020 ◽  
Author(s):  
David Dhanraj ◽  
Shruti Choudhary ◽  
Pat Raven ◽  
Pratim Biswas
Keyword(s):  
Pressure Drop ◽  
Removal Efficiency ◽  
Fine Particles ◽  
Electrostatic Charge ◽  
Filtration Efficiency ◽  
Particle Removal ◽  
Test Results ◽  
Filter Holder ◽  
Size Dependent ◽  
3D Printed

The COVID-19 pandemic has caused a severe demand for facemasks, and this has resulted in the use of those made from alternate media. As SARS-CoV-2 spreads primarily due to airborne droplets, it is critical to verify the filtration efficiency of these alternate media based facemasks. While several media are being tested and used, commercially available dust cleaners have shown reasonable filtration efficiency. This may also be due to the potential electrostatic charge on the surface which enhances capture of the fine particles. In this manuscript, we report the size dependent filtration efficiency studied systematically in a filter holder-based system as 47 mm punches; and test results on a mannequin that was 3D printed wearing a bandana mask that was placed in a chamber.

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