A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

In one aspect, a material is disclosed, including: a periodic structure including a plurality of unit cells, the plurality of unit cells having a respective plurality of shared nodes, wherein each of the plurality of unit cells has a plurality of members forming an open cell volume; and a matrix material associated with the periodic structure. In another aspect, a method of forming a material is disclosed, including: forming a periodic structure including a plurality of unit cells, the plurality of unit cells having a respective plurality of shared nodes, wherein each of the plurality of unit cells has a plurality of members forming an open cell volume; and associating a matrix material with the periodic structure. Matrix material selection, composition, manufacturing, interfacial bonding modification, and post-treatments of the periodic structure-matrix material composites are disclosed.

The invention relates to a filter unit (1, 19), having: at least one warp-knitted spacer (3) which comprises a first and a second cover layer (4; 5) having in each case a multiplicity of openings (6) which are delimited by peripheral regions (7), wherein threads (8) extend from the peripheral regions (7) of the first cover layer (4) to peripheral regions (7) of the second cover layer (5), and wherein the at least one warp-knitted spacer is rolled, twisted, and/or at least in one portion is compressed.

A cylindrical or tubular filter insert (10) of a filter material (2) for liquid media (7) is disclosed. A filtration arrangement (30) serves to receive the cylindrical or tubular filter insert (10). The filtration arrangement (30) comprises a filter housing (31) with an inlet (32) for the medium (7) to be filtered and an outlet (34) for the filtered medium (7).

Water filters which comprise a multitude of discrete filter media elements in a chamber require periodic cleaning. However, the elements tend to become adhered to one another and to the interior surface of the chamber. The invention provides a water filter for use with ponds, comprising a filter chamber for containing filter media, and a first movable cutting member provided substantially immediately adjacent the interior wall of the chamber for movement across the surface of the interior surface of the wall to break the adherence of filter media to the interior wall.

A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

A method of collection of a mycotoxin sample from an air space of an indoor environment, the method may include conditioning air, such as with an air agitator, within an air space to provide conditioned air representative of air exposed to a person within the indoor environment and sampling the air such as by filtering the conditioned air at a height within the airspace further representative of air exposed to a person within the indoor environment so as to obtain the mycotoxin sample from the conditioned air at the height. The sampling may be undertaken at a rate representative of a human respiratory rate. The mycotoxin sample may be collected by the filter and then extracted, or otherwise obtained, from the filter for identification mycotoxins that may be present in the air space. An apparatus and a system for the method are also disclosed.

The present invention discloses a sewage recycling system, and aims to provide a sewage recycling system which facilitates the use of water, reduces burdens, improves labor efficiency, saves water resources and improves the equipment practicability and functionality. The sewage recycling system comprises a machine body, a clean water tank and a recovery tank, wherein the clean water tank is provided with a water outlet and a water filling port, the recovery tank is provided with a sewage inlet, the machine body is connected with a water conveying assembly, the clean water tank is connected with a water outlet valve assembly, the recovery tank is connected with a quick plug-in connecting valve assembly, the water outlet valve assembly is detachably connected with one end of the water conveying assembly, the quick plug-in connecting valve assembly is detachably connected with the other end of the water conveying assembly.