Interpretation of terms related to filters

Interpretation of terms related to filters

[Adsorption adsorption]

It refers to the phenomenon that particles of a gaseous substance, ions of a liquid substance, or particles of a dissolved substance physically cover or adsorb on the surface of another phase. For example, the decolorization of sugar, the bleaching of oil, the descaling of soap, and the adsorption of poison gas by activated carbon are all the same.

[Affinity Affinity]

Refers to a substance that has a tendency to bind to other substances, molecules, ions, electrons, or protons.

[Air Flow Rate]

A method for measuring the passage of air through a filter. That is, the flow rate of air flowing under different pressures, different porosity and different filter areas. In the filter industry, it is usually expressed in cubic feet per minute per square foot or liters per minute per square meter at a specified pressure.

【Buffer Buffer】

For a particular aqueous solution, the pH value is not called by the addition of a small amount of acid or base to change its pH.

[Bubble Point bubble point]

In the microporous membrane industry, the use of a specific liquid soaking filter and the minimum pressure of the liquid to be squeezed out of the pores of the filter at a particular temperature.

[Combination Filtration Mixed Filter]

The mixed filter contains several filter media of different pore sizes. For example, a self-made system filtration device that is assembled by a deep filtration medium and a microfiltration membrane filter. Separate pre-filtration and final filtration in such a device provide an economical choice for use in series

[Cross-flow Filtration cross-flow filtering]

In cross-flow filtration, the filtrate flows in a parallel direction to the filter. In doing so, the filtrate has different filtration pressures on the surface of the membrane, which causes some of the filtrate to pass through the membrane while the remaining filtrate continues to flow along the membrane. This parallel direction filtration method is cross-flow filtration. This method prevents thick particles from building up to form a "filter cake."

[Dead-end Filtration no flow filtration]

In Dead-end filtration, all of the filtered liquid flows vertically through the filter. All particles larger than the pore size of the membrane are trapped on the surface of the membrane. At the same time, during the filtration process, all trapped particles will accumulate on the surface of the membrane to form a "filter cake".

[Depth Filtration Deep Filtering]

Depth filtration is generally defined as: the filtered particles will remain on the surface and inside of the filter media. Generally common filter equipment is deep-filtered.

The deep filter material is composed of an overlapping composition of fiber materials. Such filters rely on the density and thickness of these tight clusters to adsorb particulates.

[Filter filter, filter]

A device for separating solids and liquids. Laboratory funnels and filter papers, industrial sand filters, filter presses, filters and continuous filters.

The filter defines its filtration efficiency at its specific pressure with its total amount of filtration and the size of the barrier particles. In general, the lower the degree of obstruction and the lower the pressure, the greater the effectiveness of the filter.

[Filter Medium filter]

To filter the material. Such as filter paper filter cloth, nylon, asbestos, charcoal, gravel, porous pottery, etc., there are fine pores, enough to make the liquid pass, blocking the solid. When selecting a filter, attention should be paid to the compatibility of the filtration efficiency with the filtrate.

[Filter Medium filtrate]

A new liquid obtained after the filtrate is treated through a filter.

[Filtration Filter, Filtration]

In order to separate a solid and a liquid, a filter, a centrifuge, a press or a decanter is used depending on the nature and capacity, respectively, to accomplish its purpose.

[Flow Rate Rate]

The flow rate is the total amount of filtrate passing through the filter per unit time at a specific temperature and pressure. The flow rate is closely related to the surface properties of the membrane.

[Flow Rate Flow]

Flow rate and flux are two important parameters for filter media and design performance. This performance depends on the following aspects:

1) Viscosity sticky

Viscosity determines the ease with which liquids flow. The higher the viscosity of the liquid (under certain temperature and pressure conditions) the lower the flow rate. The higher the pressure required to achieve the same flow rate.

2) Differential Pressure differential pressure

The pressure difference between the inlet and the outlet in the filtration, when the filter is fully loaded, the filtration pressure difference increases.

The resistance when the object flows, that is, the resistance to movement when the two sides are in contact, generally, the temperature rises and the viscosity decreases, and the pressure rises slightly.

3) Porosity porosity

Porosity refers to the ratio of the volume of all pores on the membrane to the volume of the entire membrane. Usually: the filter has a 50-90% pore area, and the flow rate is directly related to the film's Porosity. (The more holes, the higher the flow rate)

4) Filtration Area filter area

The effective filtration area (EFA) is directly related to the amount of filtration (the larger the effective area, the higher the yield). The effective filter area may float over a wide range depending on the material and design of the filter. EFA is the area that is actually used in filtration. The larger the effective filtration area, the greater the flux under certain pressure conditions and the greater the yield of the filtrate.

[Hydrophilic Hydrophilicity]

Hydrophilicity is defined as a hydrophilic, hydrophilic membrane usually with a special chemical layer that allows the membrane to be wetted by water.

[Hydrophobic Hydrophobicity]

Hydrophobiity is a reference to the repulsion of water. Hydrophobic filters rarely hydrate completely. In observation, it can be visually observed that the small water droplets stay on the surface of the filter membrane without being adsorbed by the surface and diffused into the water surface. The size of the hydrophobicity depends on the pore size of the filter material and the characteristics of the filter material.

【Membrane Filter Filter Filter】

Filter filtration is generally defined as surface filtration, and the filtered solid particles are almost entirely on the smooth surface of the membrane.

[Membrane filtration membrane filtration]

The filtration process of the particles larger than the pore diameter of the small pores is filtered by using the pores on the surface of the membrane. Briefly, membrane filtration is a process that utilizes membrane pore size filtration.

【Microfiltration Microfiltration】

Microfiltration (also known as microfiltration) is a method of removing contaminants from liquids or gases through a microporous membrane. The pore size of the microporous membrane is generally between 0.1 μm and 10 μm. Two filtration techniques are often used in microfiltration, namely, Dead-end Filtration, Cross-flow Filtration. Microfiltration has been widely used in production and analysis, for example: preparation of pure water, clarification, wastewater treatment, etc...

[Prefiltration pre-filter]

The life of the membrane can be extended by adding a pre-filtration procedure to the front section. The typical pre-filtration is to use a large-capacity deep-filter media, so that the particles in the latter stage of the filter must be greatly reduced, increasing the working efficiency of the filter.

[Throughtput flux]

Throughtput is used to estimate the actual life of the filter, that is, the total amount of liquid that passes through the filter filter life. This period varies with the quality or amount of the filtrate and the filtration operating conditions.

[Water Breakthrough]

Water Breakthrough is the minimum pressure required to pass water through the largest pores in a dry hydrophobic membrane. The larger the pore size, the smaller the Water Breakthrough required.

[Water Flow Rate/Flux Water Flow / Flux]

Measure the flow of water through the filter. It varies with different filtrates, total pore size distribution, different filtration pressures, and filter media. At a particular pressure, the general description is: per square foot per minute / how many gallons or per square centimeter per minute per minute.

The above data are provided by: Filter Source R&D Division of Guangzhou Filter Source Water Purification Equipment Co., Ltd. Guangzhou Filter Source Filter Production Base Address: Mingbotang Industrial Zone, Dukou Road, Xinjian Town, Panyu District, Guangzhou City. Contact person of the domestic large customer business department: Mr. Tao Anjian, welcome to visit the factory!