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 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.

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.

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.

Application of recycled sludge to stabilize coagulation process

2016 ◽  
Vol 16 (6) ◽  
pp. 1571-1579
Author(s):  
Jolanta Gumińska ◽  
Adam Gumiński
Keyword(s):  
Water Quality ◽  
Conventional Treatment ◽  
Fine Particles ◽  
Coagulation Process ◽  
Optimal Value ◽  
Filter Bed ◽  
Polyaluminium Chloride ◽  
Variable Quality

In conventional treatment of variable quality mountain water, an inability to immediately adjust the coagulant dose to variations in water quality causes overdose or underdose of coagulant in relation to its optimal value. The results of the research showed that the reuse of post-coagulation sludge was an effective method to maintain high and stable coagulation effectiveness under both polyaluminium chloride (PACl) overdose and underdose conditions. Recycled sludge contains a large portion of insoluble aluminium hydroxides that could be utilized in underdose PACl conditions. Post-coagulation sludge recycled to a flocculation tank enabled the reduction of a dose of low basicity PACl by 15% compared to a dose required in conventional coagulation. In periods of coagulant overdosing, sludge addition prevented an increase in the number of fine particles in an outflow from sedimentation tanks that could not be retained in a filter bed.

High Efficiency Single Wafer Cleaning for Wafer Bonding-Based 3D Integration Applications

2012 ◽  
Vol 187 ◽  
pp. 269-272 ◽  
Author(s):  
Don Dussault ◽  
F. Fournel ◽  
V. Dragoi
Keyword(s):  
Removal Efficiency ◽  
Wafer Bonding ◽  
High Efficiency ◽  
Current Work ◽  
Particle Removal ◽  
3D Integration ◽  
Production Scale ◽  
Megasonic Cleaning ◽  
Wafer Cleaning ◽  
Transducer Design

Current work describes development, testing and verification of a single wafer megasonic cleaning method utilizing a transducer design that meets the extreme particle neutrality, Particle Removal Efficiency (PRE), and repeatability requirements of production scale wafer bonding and other applications requiring extremely low particle levels.

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