Fiber Filter Media Research Articles

섬유사 여재를 이용한 강우유출수내 미세입자 제거

섬유사 여재를 이용한 강우유출수내 미세입자 제거

Simulation of flow in diesel particulate filter system using metal fiber filter media

Metal fiber is introduced as a new filter media in wall-flow Diesel Particulate Filter (DPF) system. This technology has high temperature durability which is required for filter regeneration, and can maintain the mechanical strength even in the extreme exhaust-related vibrations of vehicles. However, the regeneration near the wall (outer layer) is more difficult because of the heat loss and reduced gas flow near the wall. In this study, a flow is simulated to determine the flow control method for the more uniform flow in all filter layer. By using Star CCM+ commercial software, we obtain local velocity, streamline, and pressure distributions in the filter, which are typically difficult to obtain from measurements. The major control factors are the filter porosity, size and location of the distribution plate, and the number of blades of the swirler. By placing the distribution plate in front of the filter, the flow velocity near the wall was increased. The optimum location and size of the flat plate were chosen. By attaching the blade on the plate the flow velocity near the wall was increased more. Therefore, the regeneration efficiency is increased by using the swirler-type metal fiber DPF system.

Analysis of Fiber Filter Media after 6 Years of Use as a First Flush Filter

Pollutants in rainwater often cause problems such as non-point source pollutant and deterioration of collected water quality in rainwater harvesting systems. Fiber filter media have been developed to resolve these problems by removing pollutants in rainwater by filtration and ion-exchange mechanisms. They have been also successfully applied for the treatment of first-flush rainwater. However, little information is available on the long-term efficiency and the lifetime of the fiber filter media. In this study, new and used fiber filter media were compared in terms of their filterability and ion-exchange capability. The used filter media samples were taken from a first flush filter in a rainwater harvesting system located in an elementary school in Kyonggi-Do. They were used from 2005 to 2010 without any replacement or cleaning. Water quality parameters of an inflow and outflow in the first flush filter were analyzed to quantify the on-site treatment efficiency of the used media. It was shown that the turbidity was removed by approximately 60% and COD was partly removed. The removal efficiency of particles by the used media was similar to that by the new media. Nevertheless, the removal efficiencies of nitrogen and phosphorous by the used media were substantially reduced when compared with the new media. This suggests that the fiber filter media should be periodically replaced to maintain high removals of nutrients. On the other hand, they can be used for more than 6 years if their primary purpose is to removal particles.

Parametric Study of Glass Fiber Drawing Process

Drawing of glass fibers is an important industrial process used for the manufacture of a variety of materials ranging from optical communications cables to fiber filter media. A variety of machines exist for performing the drawing function, but all share similar problems with control of the fiber diameter and breakage of the fibers during the extrusion process. In many cases, control systems are not configured to monitor the most critical process variables, but instead use only furnace crown temperature. Upsets in disturbance variables such as ambient temperature are compensated manually by operators, usually only after significant problem with fiber breakage occur. This work seeks to provide a better understanding of the effects of important process variables on the key quality and production parameters such as fiber diameter and production rates.

Reuse of greywater and rainwater using fiber filter media and metal membrane

As water resources become more limited and waste discharge becomes increasingly problematic, the concept of water reuse is becoming important. Recently, use of greywater and rainwater as alternative water resources has drawn attention. However, lack of useful information on the combined use of greywater and rainwater hinders wide application of these systems. In this study, novel treatment options including lignocellulose filter media and metal membranes were examined to reuse greywater and rainwater in office buildings. Laboratory scale experiments were performed to evaluate the potential of these technologies. The fiber filter media was useful to control first flush rainwater but was not enough to produce water for non-potable use in buildings. Thus, the metal membrane filtration was attempted to reject particulate pollutants. The removal efficiency of various pollutants and the membrane permeability were examined using metal membranes with different pore sizes.

Separation of Liquid Drops from Air by Glass Fiber Filters Augmented with Polystyrene Nanofibers

Expanded polystyrene (EPS) was recycled into a useful nanofiber for which large lengths are produced per mass of polymer. These nanofibers are mixed with micro glass fibers to modify the glass fiber filter media. The filter media are tested in the separation of oil droplets from air. The filtration experiments show that the addition of small amounts of polystyrene nanofibers significantly improves the removal of particles and the quality factor of the filter, but also increases the pressure drop of the filters. An optimum in the performance occurs with the addition of 7% or less by mass of 500 nanometer average diameter polystyrene nanofibers to glass microfibers (average fiber diameter of about 5 microns). This optimum balances the desired improvement in coalescence efficiency and the undesired increase in pressure drop.

Development of Fiber Filter Media to Control Heavy Metals and Nutrients in Urban Stormwater Runoff

The pollutants in urban stormwater runoff, which lead to non-point source contamination of water environment around cities, are of great concern. Lignocellulose fiber filters have potential to treat urban stormwater runoff because they are cheap and environmentally friendly, and can effectively remove particulate pollutants. However, the fiber filters alone cannot sufficiently remove soluble pollutants including heavy metals, nitrogen compounds, and phosphate. In this study, techniques for chemical modification of lignocellulose fiber filter were implemented to enhance the treatment efficiency of soluble pollutants in urban stormwater runoff. Using these chemically modified fiber filters together with polymer filter media, a new treatment device was examined to control the pollutants in first flush of stormwater. The results indicated that the filters incorporated into the treatment unit allow the control of urban stormwater runoff with minimal cost and high efficiency.

Preparation and Characterization of Catalyst-Containing SiC Fiber Filter Media

Preparation and Characterization of Catalyst-Containing SiC Fiber Filter Media