Why is Sewer Gas Removal Important?
Odour is often the most noticeable impact of sewer gas, but the long-term effects extend much further.
Hydrogen sulphide, in particular, can react with moisture to form corrosive compounds that damage concrete structures, pipelines and metal equipment. In enclosed spaces, elevated concentrations can also create significant health and safety concerns.
Effective sewer gas treatment helps facilities:
Eliminate unpleasant odours affecting nearby communities and employees
Protect concrete and metal infrastructure from H₂S-related corrosion
Improve air quality in confined spaces
Support environmental and occupational safety compliance
Reduce maintenance and equipment replacement costs
Improve the overall working environment
Activated Carbon for Sewer Gas Treatment
Activated carbon is widely used for sewer gas treatment because it continuously removes odorous gases without requiring chemical dosing.
As contaminated air passes through the carbon bed, compounds such as hydrogen sulphide and other sulphur-based gases are adsorbed, helping improve air quality before the air is discharged.
Key benefits include:
Prevents Odour Nuisance: Activated carbon captures odorous gases before they can escape into the surrounding environment, helping maintain better air quality around wastewater facilities.
Protects Infrastructure: Removal of corrosive sulphur compounds such as hydrogen sulphide helps reduce corrosion and extends the lifespan of equipment, ducting and concrete structures.
Improves Workplace Safety: Removing hazardous and foul-smelling gases creates a safer, more comfortable working environment for plant operators and maintenance personnel.
Low-Maintenance Operation: Activated carbon systems operate continuously without chemical dosing, requiring minimal maintenance while delivering consistent performance.
Flexible Installation: These systems are suitable for both indoor and outdoor installations, making them adaptable to different wastewater treatment plant layouts.
Available for Different Applications: Activated carbon is offered in standard, impregnated and application-specific grades, allowing selection based on the target contaminants and operating conditions.
It can help remove a wide range of odorous gases, including:
Hydrogen sulphide (H₂S)
Mercaptans
Dimethyl sulphide (DMS)
Dimethyl disulphide (DMDS)
Ammonia (NH₃)
Volatile Organic Compounds (VOCs)
Other sulphur-based compounds responsible for offensive odours
Where is Activated Carbon Used for Sewer Gas Treatment?
Activated carbon systems are commonly installed wherever wastewater is collected, transported or treated.
Typical applications include:
Municipal sewage treatment plants
Sewer pumping and lift stations
Wastewater treatment plants
Industrial effluent treatment plants
Food processing facilities
Pulp and paper mills
Chemical and petrochemical plants
Landfills
Composting facilities
Biogas plants
Commercial building sewer vents
These applications help control odours before they become a nuisance while protecting critical infrastructure.
Typical Process Flow
A typical sewer gas treatment system follows this sequence:
Sewer Vent / Process Air → Blower → Pre-filter (if required) → Activated Carbon Vessel → Clean, Odour-Free Air
The activated carbon vessel captures odorous compounds before the treated air is safely released.
Choosing the Right Activated Carbon for Sewer Gas Removal
For most sewer gas applications, pelletised (extruded) activated carbon is the preferred choice. Its uniform shape provides low pressure drop, good mechanical strength and reliable performance in continuous gas-phase treatment.
Where hydrogen sulphide concentrations are particularly high, such as in sewage treatment plants, lift stations or biogas facilities, chemically impregnated activated carbon offers higher adsorption capacity and a longer service life than standard carbon grades.
Selecting the appropriate carbon depends on factors such as gas composition, H₂S concentration, airflow and operating conditions.
