Papers by Keyword: Filter Media

Abstract: The newly developed non-woven filter media are composed of randomly oriented fibrous fibers from lignocellulosic biomass. The aim of this study is to investigate the feasibility of incorporating chitosan solution in fibrous filter media made from lignocellulosic biomass. The wet lay-up method was adopted for filter media fabrication. Diluted acetic acid was used as medium to dissolve the chitosan powder. Chitosan solution was applied to the fiber using two different deposition techniques, namely, spray method and addition method. The tensile test demonstrated that the filter media using spray method outperformed a filter media made from by addition technique. From the FT-IR spectrum, when the chitosan was added to empty fruit bunches fibers, the absorption peaks at around 1642 cm^-1 are clearly identified that showing the presence of amine group in the fibers. The changes observed in the spectra indicated the possible interaction of functional groups between chitosan and cellulose in the fibers. The newly developed non-woven filter media integrates the functions for both the deep filtration and mechanical screen, thus it will be an alternative medium in oily wastewater treatment industry.

Abstract: The newly developed non-woven filter media are composed of randomly oriented fibrous fibers from empty fruit bunch fibers. The wet lay-up method was adopted for filter media fabrication. The aim of this study is to investigate the effect of pre-treatment of lignocellulosic fibers on the mechanical properties of fibrous filter media. The study also aims to examine the effect of chitosan application as binder on the tensile strength of fibrous filter media from treated and untreated fibers. The fibers were treated with sodium hydroxide solution, diethyl ether, ethanol and hot water. The pre-treatment enhance the fibrous filter media properties, while filter media from untreated empty fruit bunch fibers showed lower mechanical properties. The changes in mechanical properties followed the order: alkali-treated > diethyl ether > ethanol > hot water > untreated empty fruit bunch fibers.

Abstract: Filter media is designed for industrial dust removal, but in some industrial sites, it is mainly used for air purification. So in the paper, we study air purification performance of typical filter media, including filtration efficiency, resistance, and stage efficiency. The experimental results show that wind velocity has a little effect on filtration efficiency for particulate matter in air. Besides, this paper compares the air purification performance of different filter media.

Abstract: Bag filter is one of the most effective methods of dust catcher, and the filter medias is the core part of bag filters. In this paper, we studied the filtration performance of several common filter medias comparatively through experimental methods, and the results can provide certain basis for the dust removal performance improvement of filter medias.

Abstract: Particles come in a wide range of sizes. Fabric filter with different structure shows different filtration performances on fine particle. In the paper, two types of filter media structure, i.e. non-woven structure and membrane structure are compared and studied. It can be seen that the pressure drop of membrane filter is apparently much higher than that of non-woven structure for it owns a density membrane. Membrane structure gives apparently higher efficiency for fine particle than non-woven structure.

Abstract: This study focused on the basic performance and analysis of a newly developed composite filter media used in high temperature filtration for bag house. It consists of basalt and polysulfonamide fibers. Thermal dimensional stability, heat resistance, air permeability and chemical corrosion resistance were tested to reveal the properties. Based on the experimental results, possible analysis showed that the new filter material had excellent performance in heat resistance, air permeability and acid corrosion.

Abstract: Industrial dust emission is one of the main sources of fine particle especially for PM2.5 in atmosphere. Filter media is the key component for baghouse. In the paper, several normal needle felt filters and membrane filter are studied through experiments. The performances of filter such as resistance, capture efficiency for total particle and number counting efficiency for fine particle are tested.The experimental results show that the resistance of filter increase after aging, the resisitance increasing rate of membrane filter is the smallest; The efficiencies for total particles of normal filter are above 99.9% at clean state, and 99.99% at stable state after aging; Although the filters have high efficiency for total particle, but the number counting efficiency for 10μm particle is 94%-99%, and 52%-92% for 2μm particles. New filters for fine particles are needed.

Abstract: In order to improve utilization ratio of blast furnace slag (BFS), the study used BFS, cement and building glue to make blast-furnace-slag granular media (BGM) in a non-sintered process. The characterization of BGM was analyzed by physical method, scanning electron microscopy (SEM) and D/max-rA X-ray diffraction (XRD). And the influence of hydraulic retention time (HRT) and air-liquid ratio (A/L) on the removal of average chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) were also investigated. The results indicated that the BGM presented high total porosity, large total surface area and low bulk and apparent density. The BGM reactor showed the good removal efficiency on COD and NH4+-N with HRT of 6 h and A/L of 5:1, which were above 86% and 90%, respectively. Overall, BGM showed good performance as wastewater treatment filter media in biological aerated filters (BAF), whose application is a promising way to use waste blast furnace slag.

Abstract: this review summarizes an important factor of clogging in subsurface flow constructed wetlands ¬(SSF)—field distribution. The efficiency of filter media and the spatial distribution of biological growth are determined by the flow field distribution directly. If the flow field distribution is un-uniform, it would accelerate the clogging of substrate. The influencing factors for flow field distribution, including hydraulic loads, properties of filter media, filling structures and root distribution were investigated, and the clogging reasons were discussed additionally. At last, this study showed some corresponding research methods, and helping in the process of research and development of subsurface flow constructed wetlands in solving clogging problem.

Abstract: This study aimed to examine the behavior of different filter media used in gas filtration at high pressure. Trials were carried out having phosphate concentrate as the particulate matter and compressed air as fluid. Operating conditions were evaluated at the following absolute pressures of the system: 193, 393 and 693 kPa, and the gas velocity was kept constant at 0.05 m/s. The results indicated that, for a given pressure drop at the filter, the highest absolute pressure applied to the system (693 kPa) yielded the highest powder mass deposited on the filter medium. An analysis of the porosity of dust cakes revealed that the increase in pressure resulted in cakes which were more porous and less resistant to gas flow. It was also verified that the increase in the pressure of the system provided an increase in the fractional efficiency of the filters for particles smaller than 5 μm.