In an industrial wastewater environment, gas monitoring is critical for three reasons: Life Safety (protecting workers from toxic gases), Asset Protection (preventing corrosion), and Process Optimization (managing the biological or chemical treatment stages).
The "Hazardous Trio" in these environments typically consists of H S, CH , and O deficiency.
| Gas | Source in Wastewater | Hazard Type | Sensor Technology |
| Hydrogen Sulfide ( H S) |
Anaerobic decomposition of organic matter in "wet wells" or sludge tanks. | Toxic & Corrosive. Causes olfactory fatigue and eats away at steel/concrete. | SPE (for high humidity). |
| Methane (CH ) | Byproduct of anaerobic digestion. Major component of "Biogas." | Explosive. Displaces oxygen in confined spaces. | Infrared (IR) for high concentrations or Catalytic Bead (LEL). |
| Oxygen (O ) | Displaced by other gases or consumed by biological activity. | Asphyxiation. Dangerously low levels in pits and manholes. | Solid Polymer Electrochemical (Capillary or Lead-free). |
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