Assessment of Chemical Fiber Air Filter for General Ventilation

Air filters for general ventilation have mainly been used to control the concentration of indoor particulate matter. In this study, the pressure differential, test dust capacity, quality factor and operating life of class F8 pleat–plate and multi-bag type chemical fiber filters were evaluated using an air filter performance test system. The results showed that the resistance increase rate of multi-bag filter (0.49 Pa/g·(cm/s)) was lower than that of pleat–plate filter (1.94 Pa/g·(cm/s)), the quality factor of the multi-bag filter was lower than that of pleat–plate filter, and the dust capacity of the multi-bag filter was much higher than that of the pleat–plate filter. The operating life of the multi-bag filter was 8 times as that of the pleat–plate filter with the measured PM2.5 of outdoor. The energy consumption of the pleat–plate filter was 2.2 times that of the multi-bag filter. Analyzing the electron microscope photos after dust loading, the dust depth of pleat–plate filter into filter material was thinner than that of multi-bag filter. The research results could provide data support for the design optimization and selection of ventilation filters and the treatment of the particulate matter in indoor environments.

Effect of Pressure Differences on Sludge Filtration Process Efficiency by Using Plate Filter Press

Waste treatment in the industry produce sludge from the settling of solid material as a by product of the treatment process. The resulting sludge can’t be thrown away in large quantities because it can cause problems if there is still water content in it especially for industrial centers located around residential areas. So that filtration is carried out on the sludge from the Sedimentation Tub at the WWTP know in the area of Lamper, Semarang with the aim of reducing the volume of sludge by separating the water from the sludge before being discharged. The results of the analysis of the sludge filtration in the Settling Basin at WWTP obtained the value of cake resistance at a pressure of 75 kg / m2 of 4.42E + 11 m/kg, at a pressure of 90 kg/m2 of 5.62E + 11 m/kg and at a pressure of 104 kg/m2 of 6.74E + 11 m/kg. The results of the analysis on the resistance value of the filter medium obtained a value of 1.59E+12m-1 at a pressure of 75 kg/m2, 1.23E+12 m-1 at a pressure of 90 kg/m2 and 1.61E+12 m-1 at a pressure of 104 kg/m2. While in the analysis of water content, at a pressure of 75 kg/m2 obtained a value of 35.437%, at a pressure of 90 kg/m2 obtained a value of 35.024%, and at a pressure of 104 kg/m2 obtained a value of 34.024%. Efficiency The optimal pressure is 104 kg/m2.

Fabrication of Micro-Silicon Filter and Separating of Blood Cells

This research developed a micro-silicon cell filter using MEMS fabricating technology, which has constant filtering channel size, uniformed distribution, and good surface quality. Blood cell filtering experiment was carried out by applying pressure injection and the filtering quality was studied via cell counting. The experimental results demonstrates that flat plate filter can implement blood cells filtering separation, and erythrocyte recycling rate reaches 90% with the 4～5m in filtering size and 0.1L/min injection flow-rate fulfilling the requirement of blood cells separation. Increasing the flow-rate can improve filtering efficiency to a certain degree but has little effect on erythrocyte recycling rate, because micro array filter is insensitive to back pressure in contract to the filled filter.

Research on Microstructure and Mechanical Property of the Production of Al-Si Alloy by Electric Warming

Adopting quartz plate filter of 20 mesh to filter the ZL102 alloy compounded by Al-30Si coarse alloy produced by electric warming, the Fe content in the alloy is reduced to 0.43% from 1.14%, the big massive and petaloid Fe phase becomes fine block-like. The tensile strength and elongation of the alloy arrive at 182MPa and 4.3% respectively, which increased by 38% and 290% separately compared with the alloy without filtration. The mechanical property of this alloy has been close to the alloy compounded by pure Al and it can fully meet the demand of commercial production.