Hydrogen Sulphide Scrubbers
The Anaerobic digestion of organic matter produces methane and carbon dioxide. It can also lead to the production of other trace gases, such as hydrogen sulphide. Hydrogen sulphide can be a health and safety hazard. The gas has an unpleasant odour and can cause the rapid corrosion of carbon steels.
Hydrogen sulphide can be removed from gas streams by means of chemical oxidative scrubbing. Such scrubbers employ water based reagents containing oxidants such as sodium hydroxide, sodium hypochlorite, potassium hydroxide and ethanolamines. Each chemical oxidant has its advantages and disadvantages for specific applications.
- Remove noxious odours
- Prevent corrosion in plant and equipment that can be brought about by hydrogen sulphide
- Prevent emissions of sulphur dioxide
- Remove health hazards that can result from high concentrations of hydrogen sulphide
- Organics gas scrubbers meet all environmental standards for removing hydrogen sulphide.
Some basic facts
- Atomic weight 34.08
- Melting point -85.5oC
- Boiling point -60.3oC
Toxicological Summary: Inhalation represents by far the most significant route of entry for hydrogen sulphide. Exposure to levels of hydrogen sulphide above 500 ppm even for short periods will generally result in rapid or immediate respiratory failure or collapse. Death will result unless the victim is rescued immediately and given pulmonary resuscitation. Exposure to levels below 500 ppm may result in serious consequences including unconsciousness and death. Reaction equation: H2S + 2XOH = X2S + 2H2O
- Flow rate in this standard range: 100 to 20,000 normal cubic metres per hour
- Pressure drop across scrubber: Typical = 25 mbar gauge
- Removal efficiency: Typical = 98%, subject to design specification
The removal of hydrogen sulphide is a basic requirement when working with the output from anaerobic digesters located at, for example, pigs farms. Where the objective is to destroy the transporting gas as well as the hydrogen sulphide, Organics is able to offer thermal oxidisers that can reduce 20,000 ppm of hydrogen sulphide to less than 0.5 ppm.