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Wastewater treatment
and biogas plants
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At this type of plant gas detectors are needed typically for the detection of methane, hydrogen sulphide and petrol (gasoline).
In connection with ATEX risk assessment you determine where an explosive mixture might potentially occur.
This would typically apply to digesting tanks, gas treatment systems, sludge drying, etc.
Petrol (gasoline) detectors are often used at treatment plants in connection with inlet works in order to detect possible oil/petrol (gasoline) leaks in the sewage systems.
Hydrogen sulphide is formed in connection with decomposition of organic matter under anaerobic conditions – occurring e.g. in sewers and pump wells. Hydrogen sulphide is extremely flammable and very poisonous even at low concentrations. |
| Symptoms arising from breathing H2S |
| 0,0003-0,02 ppm |
Distinct smell |
| 3-10 ppm |
Very offensive smell |
| 20-30 ppm |
Strong odour of rotten eggs |
| 30-100 ppm |
Foul, sickening sweet stench |
| 50-100 ppm |
Makes your eyes smart |
| 100-200 ppm |
The sense of smell is deadened |
| 250-500 ppm |
Accumulation of fluid in the lungs (pulmonary oedema), coughing up bloody sputum |
| 500-1000 ppm |
Breathing failure, death |
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