Odour control

Definitions Odour is the property of a substance that activates the sense of smell and can cause nuisance and health damage. Companies can emit odour (emissions) to the environment that can bother people and lead to complaints and bad publicity. Fugitive emissions contribute to air pollution and climate change as well as an economic cost…

Air treatment with activated carbon in soil remediation projects

In certain soil remediation projects, there can be a need for purification of exhaust from air strippers, tent ventilation and even the interstitial air in the ground present naturally or under purge from treatment systems. Air Strippers The pump and treat method is a technology often used in soil remediation projects where contaminated groundwater is extracted by…

Ammonia (NH₃) removal from air

Introduction Ammonia (NH₃) is a colourless, low molecular weight gas with the chemical formula NH₃ (See figure 1). It has a pungent smell, often associated with strong household cleaners. Ammonia (NH₃) is lighter than air but can be easily condensed to a liquid due to strong hydrogen bonding between the ammonia molecules (hydrogen bonding is…

Arsine (AsH₃) removal from air

Introduction Arsine (AsH₃) is an extremely toxic gas that is generated upon exposure of arsenic-containing ores to acids. It is also a by-product of refining of non-ferrous metals. Arsine is used extensively in the manufacture of microchips, solid-state lasers and for the synthesis of organoarsenic compounds. Arsine (AsH₃) is a colourless, flammable, non-irritating toxic gas…

Phosphine (PH₃) removal from air

Introduction Phosphine is the compound with the chemical formula PH₃. Phosphine (PH₃) is used as an intermediate in organophosphorus chemistry and as a dopant in the semiconductor industry. Phosphine (PH₃) is alsowidely used as a fumigant (for example, in the tobacco industry) that does not leave residues on the stored product, and for pest control.…

Styrene Emissions Control – Reduction of styrene emissions during filling of storage tank

Introduction Styrene is a monomer that is used to produce a wide variety of plastics. During storage of styrene and manufacture of these plastics, emissions of styrene can occur causing concerns of exposure for workers and release to the environment. Case study: Reduction of styrene emissions during filling of storage tank Styrene can be transported…