exhaust scrubber

Exhaust scrubbers neutralize toxic and hazardous gases from process tools before releasing air to the environment. **Purpose**: Remove toxic, corrosive, or otherwise harmful gases from exhaust streams to meet environmental and safety regulations. **Types**: **Wet scrubbers**: Pass exhaust through liquid spray or packed tower. Water or chemical solutions absorb/neutralize gases. **Dry scrubbers**: Use solid media (activated carbon, chemical adsorbents) to capture or react with gases. **Burn/oxidation**: Thermal oxidizers or burn boxes for combustible gases like silane. **Target gases**: Acids (HF, HCl), bases (NH3), toxics (AsH3, PH3), pyrophorics (SiH4), VOCs, fluorinated compounds. **Scrubber selection**: Match scrubber type to exhaust chemistry. May need multiple stages or different scrubbers for different streams. **Efficiency requirements**: Removal efficiencies of 99%+ for regulated emissions. Continuous monitoring required. **Waste streams**: Wet scrubbers produce liquid waste requiring treatment. Dry media requires disposal/regeneration. **Maintenance**: Media replacement, spray nozzle cleaning, pump service, monitoring system calibration. **Regulations**: Permits specify allowable emissions. Scrubbers sized to meet permit requirements.