An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A contact angle of the first porous PTFE membrane with water is in the range of 154 to 165.

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium (10) has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A thickness of the first porous PTFE membrane is in the range of 4 to 40 m and a specific surface area of the first porous PTFE membrane is 0.5 m.sup.2/g or less.

Filter media comprising a pre-filter layer and related components, systems, and methods associated therewith are provided. In some embodiments, the pre-filter layer may be designed to impart desirable properties to the filter media, such as a high gamma and/or long service life, while having relatively minimal or no adverse effects on another property of the filter media that is important for a given application. For instance, a pre-filter layer may be used to improve the upstream removal of fine particulate matter, which may clog a downstream efficiency layer comprising submicron fibers and reduce filtration performance. The pre-filter layer may be configured to increase service life and/or increase the gamma of the filter media. Filter media, as described herein, may be particularly well-suited for applications that involve filtering air, though the media may also be used in other applications.

A dynamic filtration system and method for solid-fluid separation to eliminate or substantially reduce media blinding includes: a fluid inlet through which to receive an inlet flow of fluid to be filtered; a filter membrane; a rotatable mechanical barrier, disposed within an outer shell, to contain the filter membrane and through which to receive and filter the inlet flow of the fluid, the rotatable mechanical barrier configured to rotate dynamically along an axis, to create a high shear flow, thereby to prevent an accumulation of solids on the filter membrane, and whereby a resultant centrifugal force propels any solids and slurry onto the outer shell to be continuously removed from the dynamic filter system; a fluid outlet through which to disperse a filtered fluid; and a solids and slurry outlet through which to disperse solids and slurry collected in filtration when propelled to the outer shell of the mechanical barrier.

A membrane method processing system and process for a high-concentration salt-containing organic waste liquid incineration exhaust gas is described. The system consists essentially of a waste liquid incinerator (I), a gas-solid separator (II), a heat exchanger (III), an air blower (IV), an anti-caking agent storage tank (V), a membrane method dust cleaner (VI), an induced draft fan (VII), a check valve (VIII), and a desulfurization tower (IX). The present invention introduces the dust collecting membrane into the tail gas treatment system and utilizes the small pore size and high porosity of the dust collecting membrane to prevent inorganic salt particles from entering the internal of the filter material and agglomerating there. When the humidity of the gas entering the dust collector increases during the dust removing process, the anti-caking agent is also introduced into the tail gas treatment system to change the surface structure of the inorganic salt crystal to prevent the crystal from agglomeration.

A filter media is disclosed for removing particles from an air stream. The filter media, in an embodiment, includes a porous membrane layer and a pre-filter layer including a downstream surface and an upstream surface. The pre-filter layer is arranged with the downstream surface adjacent an upstream side of the porous membrane layer. The pre-filter layer includes a wet laid composite media having a mixture of glass fibers and synthetic fibers. A method for using the filter media in a gas turbine is also disclosed.

This disclosure provides a waste battery thermal desorption treatment system. The waste battery thermal desorption treatment system includes: a rotary kiln, having a feed port, thermal desorption cavity, heating cavity, discharge port, and first exhaust port; a dust removal apparatus, including a housing with a gas inlet port and a second exhaust port, and a dust removal structure disposed in the housing configured to collect impurities in a gas exhausted from the first exhaust port; a condenser, in communication with the second exhaust port, to condense an electrolyte constituent; and an adsorption column having a defluorination agent for dry defluorination on remaining constituents in the gaseous exhaust. This disclosure resolves the problem of low recycling efficiency of waste lithium batteries in the prior art.

Filter media comprising a pre-filter layer and related components, systems, and methods associated therewith are provided. In some embodiments, the pre-filter layer may be designed to impart desirable properties to the filter media, such as a high gamma and/or long service life, while having relatively minimal or no adverse effects on another property of the filter media that is important for a given application. For instance, a pre-filter layer may be used to improve the upstream removal of fine particulate matter, which may clog a downstream efficiency layer comprising submicron fibers and reduce filtration performance. The pre-filter layer may be configured to increase service life and/or increase the gamma of the filter media. Filter media, as described herein, may be particularly well-suited for applications that involve filtering air, though the media may also be used in other applications.

A mask according to an embodiment of the present disclosure may adjust permeability thereof by including and using an air filter unit which is capable of expanding or contracting, in at least one direction, a filter for filtering particles contained in air passing through the mask by pores.

The invention relates to a method for producing a membrane module, comprising a plurality of elongated filter elements disposed in parallel adjacent to one another, each element comprising a longitudinal channel, a housing enclosing the filter elements, and a collector chamber between the housing and the filter elements.