Abstract: An activated carbon coated with an intumescent material which will expand at an elevated temperature and render the activated carbon resistant to oxidation. The activation carbon can be in granulated form, including pelletized, and impregnated. The intumescent material is preferably attached to about 10% of the exterior surface of the activated carbon and when exposed to a certain elevated temperature the intumescent material will expand and cover all or almost all of the exterior surface of the activated carbon thereby preventing its burning. The amount of intumescent material is not operable for causing a detrimental reduction in the adsorption capacity of the activated carbon when the coated activated carbon is at temperatures below the certain designed elevated temperature.

Abstract: Many industrial operations generate and release volatile organic compounds. The fumes, frequently mixed with large quantities of air, are collected and sorbed on activated carbon. The spent sorbent is frequently sent to an off-site facility for reactivation since on-site reactivation of the spent sorbent has heretofore been very costly. Shipping of hazardous waste products such as spent sorbents containing sorbed volatile organic compounds on public roads is a growing concern of governmental bodies and regulations requiring on-site handling are anticipated.This invention provides a closed loop system for on-site reactivation of the spent sorbent and incineration of the contaminants. The combustion gases are cleaned simultaneously with the main gas stream containing the volatile organic compuonds so that only cleaned gases are vented to the atmosphere.

Abstract: A gas filtration apparatus for filtering large volumes of air. The apparatus has a plenum chamber which features a V-shaped housing having a main portion located inside the plenum chamber, and an upper portion extending outside and above the top plenum chamber. The V-shaped housing has two vertical legs extending from a vertically oriented apex end which forms an acute angle between the vertical legs, and a vertically oriented prong end opposite the apex end. The apex end is near the outlet of the plenum chamber and the prong end is near the inlet of the plenum chamber. Each vertical leg has an inward vertical wall and an outward vertical wall. The distance between the walls defining a first length. A second length is defined by the distance that the upper portion of the V-shaped housing extends above the top surface of the plenum chamber. The second length is at least as great as the first length.