Quench/scrubber system is suited for treatment of contaminants emitted from high temperature sources. Hi-TScrub utilizes horizontally or vertically configured, atomized spray and venturi gas quenchers to cool corrosive hot gas streams up to 2600°F (1427°C) before scrubbing. Cooled gas with acid vapors, halogens or particulate then can be removed. The system can handle gas capacities from 500 to 150,000 cfm. Typical applications include contaminants from thermal oxidizers, incinerators and calciners.