What is the filter of the important issues

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The filter should be chosen according to the suspension concentration, the solid particle size, the viscosity of the liquid and the quality requirements on the filter. Several filter media may be selected first, by filtration the funnel experiments, different filter media and under different pressure filtration speed was measured, and a solids content of the filtrate, the residue thickness of the layer and the moisture content, to identify the appropriate filter criteria, initially selected Y type filter type, according to the handling capacity of the selected filter area, and the actual test validation. The vacuum filter is a negative pressure as the driving force of the filter is formed at the filtrate outlet. This filter is divided into two kinds of intermittent operation and continuous operation. Intermittent operation of the vacuum filter can be various concentrations of the suspension was filtered, and the continuous operation of the filter is adapted to filter solid particles containing more thick suspension.

Pressurized filter applied in the suspension at the inlet pressure, or a mechanical pressing force is applied to the wet material as a filter driver, suitable for applications requiring the filtration pressure larger suspension, also divided into an intermittent operation and the continuous operation of two . For the suspension of the solid particles settle quickly, application filter feeding in the upper portion of the filter medium, so that the filtration direction and gravity in the same direction, the first settlement, coarse particles can reduce clogging of the filter media and the filter residue layer; in difficult filtration a suspension ( colloid) is mixed, such as diatomaceous earth, expanded perlite, etc. The coarser solid particles, the residue layer can become loose; filtrate viscosity is large, the suspension is heated to reduce viscosity. These measures can accelerate the filtration rate.water filter cartridge replacement

In filtration theory research, the filter cake layer filtration resistance and estimates of porosity, filtration rate, filtration equipment, analog and enlarge, the thin liquid clarify filter and dynamic filter processing, as well as the study of the filter media, are important topics. The use of computer-controlled filter operation is the development direction of the filtration equipment. In the actual filtering process, three ways are often occur simultaneously or sequentially. The processing capability of the filter depend on the filtration speed. The suspension of solid particles in a large, uniform particle size, the filtered residue layer porosity is more smooth, and the filtrate through the speed of the residue layer is larger. Application coagulant diversity synthesis of the fine particles of the larger clumps, help to improve the filtration rate.

Filter press filter impetus divided into gravity filters, vacuum filters and pressurized filter three categories. Gravity filter is by means of gravity and the difference of the suspension, the pressure formed in the filter medi a as the driving force for filtration is generally intermittent operation. Is the development of new filtration equipment: mechanical force the squeezing filtration equipment; able to achieve without dynamic filter of the filter cake layer filter; washing coal wastewater treatment, chemical and petroleum industry with large filtration equipment.