A fuel tank cap includes a casing; a main chamber disposed in the casing; a vapor vent channel disposed in the casing and communicating with the main chamber; annular partition walls disposed in the main chamber and configured to divide the main chamber into troughs surrounding a central tunnel, each partition wall including a cut so that the troughs and the tunnel are capable of communicating with each other via the cut; activated carbon filled in the troughs; and a permeable plug disposed in the tunnel, which is made by wrapping rust-resistant flexible wires so that a plurality of intercommunicated air gaps are formed among the flexible wires. The vapor vent channel includes the cuts, the troughs and the air gaps. The activated carbon captures fuel vapors and absorbs VOCs in the fuel vapors when the fuel vapors pass through the vapor vent channel.

A filtering device is provided for filtering pollutants from a gas stream. The device includes a cartridge comprising an inner perforated passage, an outer perforated jacket, one or more non-perforated ends and a sorbent bed contained between the inner passage and the outer jacket; and a outer shell containing the cartridge and having a first port in fluid communication with the inner perforated passage and a second port in fluid communication with the outer perforated jacket. A flowpath of the gas stream into any one of the first port or the second port, through the sorbent bed and out of the other of the first port or the second port is a bidirectional flowpath. A method is further provided for filtering pollutants from a gas stream. The method includes the steps of allowing the gas stream to flow into a filtering device in a first direction, the device comprising a cartridge having a sorbent bed contained therein; directing the gas stream to bend in a second direction differing from the first direction as it enters the sorbent bed; and allowing the gas stream to pass through the sorbent bed and to exit the device.

A purification device for exercise environment is provided and includes a main body, a purification unit, a gas guider and a gas detection module. The purification unit, the gas guider and the gas detection module are disposed in the main body to guide the gas outside the main body through the purification unit for filtering and purifying the gas, and discharge a purified gas. The gas detection module detects particle concentration of suspended particles contained in the purified gas. The gas guider is controlled to operate and export the gas at an airflow rate within 3 minutes. The particle concentration of the suspended particles contained in the purified gas, which is filtered by the purification unit, is reduced to and less than 0.75 μg/m.sup.3. Consequently, the purified gas is filtered, and an exerciser in an exercise environment can breathe with safety.

A gas purifying and processing method for exercise environment is provided and includes steps: (a) providing a purification device for exercise environment in an exercise environment, wherein the purification device for exercise environment includes a main body, a purification unit, a gas guider and a gas detection module; (b) detecting a particle concentration of the suspended particles contained in the purified gas in real time by the gas detection module; and (c) detecting, issuing an alarm and/or notification, and notifying an exerciser to stop exercising, and feeding back to the purification device to adjust an airflow rate of the gas guider by the gas detection module, wherein the gas guider discharge a gas at the airflow rate within 3 minutes to reduce the particle concentration of the suspended particles to less than 0.75 μg/m.sup.3, wherein the airflow rate is at least 800 ft.sup.3/min, and the main body maintains a breathing distance ranged from 60 cm to 200 cm.

A filtration device for an air purification appliance includes a first filtering cartridge structure containing a classic absorbent or adsorbent material selected from activated carbon or zeolite and a second, different filtering cartridge structure holding a filtering medium consisting of a specific adsorbent material which is porous and functionalized with at least one probe molecule in such a way as to trap aldehyde-type chemical contaminants.

The present invention relates to a method and a system for the treatment of exhaust gas from industrial processes comprising at least the following consecutive steps: a) passing an exhaust gas comprising volatile organic compounds (VOCs) and/or amines through a catalytic zone at elevated temperatures, said catalytic zone comprises a deNO.sub.x-catalyst and an oxidation catalyst thereby providing a first treated gas stream, and b) subjecting the first treated gas stream to ultraviolet radiation in order cause photooxidation.

A remedial pollution control system for treating volatile organic compounds that may include a vapor concentrator connected to a line that is laden with volatile organic compounds, the concentrator has an organic condensate output line and a vapor output line; a mixing chamber adapted to receive air provided from an air supply line, combustible fuel from an alternate fuel supply line, and a vapor stream from the vapor output line to produce a mixed fuel supplied to an internal combustion engine, a control mixing system with a controller for producing a proper air to fuel ratio in the mixed fuel supply, and power generated to operate other devices used to more efficiently abate volatile organic compounds and reduce greenhouse gas emissions.

A pollution reduction system includes a catalytic converter, fabric filtration and a plurality of cyclonic separators to effectively reduce CO, VOCs and particulate matter emissions from biomass fuel-fired furnaces, while efficiently extracting heat from exhaust gas.

A system for decomposing contaminants, including volatile compounds (VOCs), with a visible-spectrum photocatalytic composition.

An object of the present invention is to provide a new frameless catalytic thermal oxidation device capable of treating concentrations of harmful materials including NOx at a low temperature. Further, another object of the present invention is to provide a frameless catalytic thermal oxidation device capable of minimizing the occurrence of THC and minimizing a risk of accidents and environmental pollution which may occur in maintenance operations. According to the objects, the present invention provides a cartridge-type thermal oxidation device capable of being separated for maintenance, wherein a cartridge internal structure is configured so that the time while the material to be treated stays in a zone with the catalyst is increased, and a member capable of dropping and collecting powder generated by thermal oxidation reaction is configured.