نتایج جستجو برای: dual media filter
تعداد نتایج: 550868 فیلتر نتایج به سال:
This study, sponsored by the Water Environment Research Foundation, focused on innovative methods for the capture of metals from stormwater. The two areas of focus were media filters and swales. This paper will focus on the filter studies. Twelve media were chosen for initial evaluation. Equilibrium and kinetic studies were formed on these media to assess their performance in capturing metals f...
HEPA filters serve as important safety device to protect personnel as well as the public and environment from the radiation effects exist in the air, so they are vital devices in the event accidents. DOE provides directions through the use of two technical standards, 3020 and 3025, including QA requirements for the procurement, packaging, shipping and storage of HEPA filters and also provides d...
Four microporous virus-absorbent filter media for recovering low levels of virus from 380 liters of drinking water were compared. In addition two of the filter media were compared with 1,900 liters of drinking water. The filter media evaluated were MF nitrocellulose membranes (293 mm), AA Cox M-780 epoxy-fiberglass-asbestos disks (267 mm), K-27 yarn-wound fiberglass cartridges + AA Cox M-780 di...
A study was carried out on the effectiveness of bioretention systems to abate stormwater using computer simulation. The hydrologic performance was simulated for two bioretention cells using HYDRUS-1D, and the simulation results were verified by field data of nearly four years. Using the validated model, the optimization of design parameters of rainfall return period, filter media depth and type...
This work is a study of the movement of particles, one at a time, through a fixed filter. Various assumptions are made about particle and pore sizes, pore selection rules and filter configurations. This report is divided into three main sections: The first studies the filter by analyzing its layers both in a qualitative sense and by computational simulations. The next studies the filter through...
In the present study, a theoretical model was used to examine factors affecting the filtration characteristics of filters used for respiratory protection. This work was designed to support the particulate filter test requirements established in 1996. The major operating parameters examined in this work include face velocity, fiber diameter, packing density, filter thickness, and fiber charge de...
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