The invention concerns a method for drying at least one cell of the electrostatic precipitator of a smoke treating unit in a system of a coffee beans roasting apparatus and a smoke treating unit, said method comprising the step of passing hot air through said cell, while said cell is positioned inside the electrostatic precipitator and while said cell is switched off.

A composite filtration material is provided as well as a method for preparing the same. A filter is also provided that is fabricated with the presently disclosed composite filtration material. In various aspects, the provided composite filtration material may include activated carbon doped with silver and/or iron oxide. A one-step thermal decomposition process is provided that may be employed to prepare the provided composite filtration materials. The one-step thermal decomposition process may include dissolving one or more precursors in water, spraying the dissolved one or more precursors onto activated carbon, and heating the activated carbon saturated with the one or more precursors for a predetermined amount of time. The inventors have found that the provided composite filtration materials are more effective (e.g., higher removal of pollutants) and have a longer service life as compared to typical activated carbon filtration materials.

A vacuum cleaner for air pollution prevention includes a main body, a blower, a filtering and cleaning assembly, and a gas detection module. The main body is configured to form a flow-guiding path. The blower is disposed in the flow-guiding path to guide air convection. The filtering and cleaning assembly is disposed in the flow-guiding path to filter and clean the air pollution source in the air guided by the blower. The gas detection module is disposed in the flow-guiding path to detect the air pollution source and transmits a gas detection data.

A smoke and dust treatment apparatus for welding, said apparatus comprising a polishing and dust extraction module and a smoke and dust purification module. The polishing and dust extraction module comprises a double-layer dust extraction cover (3), a protective cover (2), an industrial brush (4), a first air guide portion, a second air guide portion (24) and a drive motor (22), the drive motor (22) driving the industrial brush (4) to rotate at high speed to perform polishing. During welding and polishing, a mechanical arm (6) drives the double-layer dust extraction cover (3), and a suction hole (20) of the double-layer dust extraction cover (3) and a suction guide hole (19) on the industrial brush (4) simultaneously take in toxic gas and debris such as iron filings.

A method for producing carbon or graphite foam parts with high purity level for high-temperature insulation under vacuum or protective gas, as insulating material or as filter material, includes the following steps: introducing dry, foamable starch (1) into an open-top container (2) having a round or angular cross section, until the base (3) of the container (2) is covered amply and uniformly with starch (1); introducing the container (2) partly filled with starch (1) into an oven (4), and heating the container (2) to a foaming temperature of >180° C. over a prolonged period of several hours to foam the starch (1), until the container (2) has filled completely with carbon foam (6); withdrawing the container (2) from the oven (4) and extracting the carbon foam (6) after sufficient cooling, and optionally portioning the carbon foam (6) into carbon foam parts (6.1).

Compositions made of laminate comprised of porous carbon nanotube (CNT) are disclosed. Uses of the Compositions, particularly for reducing a formation of a load of a microorganism or of a biofilm, are also disclosed.

A method for the removal of mycotoxins from a space associated with a built environment is disclosed. The method may include one or more of the steps of: filtering air within the space using a first filter including a High-Efficiency Particulate Air (HEPA) filter and a second filter including a carbon filter; and, applying a cleaning product including a high alkaline product to one or more surfaces proximate the space.

A method of water treatment includes providing water that includes at least one contaminant. An effective amount of at least one filter media is added to the to the water that includes at least one contaminant. The water and the at least one filter media are agitated to form a homogeneous mixture. A cationic biopolymer is added to the homogeneous mixture of water and the at least one filter media. The water is separated from the at least one contaminant and the at least one filter media.

An air filtration system is disclosed. The system comprises an air conduit having an inlet and an outlet, a self-contained electric power source, an electrically powered fan, an air filter located transversely across said air conduit, and an air boundary containment nozzle at the outlet of the air conduit. The nozzle has an outlet diameter of between about 0.5 centimeters and about 4 centimeters. The nozzle minimizes the mixing of the unfiltered ambient air with the filtered air directed to the wearer.