Gas and liquid purifying units; particulate removal apparatus and units; gas recycling units; devices comprised of one or more of nozzles, spargers and impellers for injecting and mixing gases and liquids; integrated oxygen injection units; industrial gas storage and distribution units; bulk gas delivery units; water treatment and purification units and water oxygenation units; carbon dioxide injection units; ozone delivery units; apparatus for the production, application and maintenance of cryogenic temperatures; cryogenic freezing devices; heat recovery and emission control units for use in industrial processes, and replacement parts therefor, namely pyrolyzers, ionizers, filter bed modules and superheaters; air separation plants for extracting gases from the air for the production of gases or liquefied gas products; membrane plants for the production of gases; vacuum pressure swing adsorption units; in-situ hydrogen, nitrogen and zero air generators for producing gases; on-site ozone generators for use in water treatment operations; bulk liquid storage and vaporizer units for generation of oxygen, nitrogen, argon, hydrogen and helium; oxy-fuel burners and oxy fuel combustion units; oxygen enrichment units for increasing the oxygen content of combustion air and lancing systems; the foregoing goods being for use in diverse industries, including the steel, chemical, petrochemical, electronics, metal, food and beverage, biotechnology, pharmaceutical, printing and textiles, glass, and water and waste treatment industries