Green Dome Odour Filters

Odours from pump stations

Odours from pump stations are a common problem. For a small pump station, this can be solved by fitting an ARMATEC Green Dome Odour Filter. The hydrogen sulphide and other odours are adsorbed by a bed of carbon in a low profile vessel sited adjacent to the pump station.

As a pump station fills with wastewater, air is displaced and along with it hydrogen sulphide and other odours. These can create a nuisance for neighbours. A common hydrogen sulphide concentration in air discharged from a pump station is only 1ppm to 2ppm, but this is a major problem as the odour threshold for hydrogen sulphide is just 0.005ppm.

For large pump stations, usual practice is to extract the odourous air from the pump station with a fan, and then treat the air with either a biological scrubber, a purpose designed carbon adsorption bed, or a soil bed filter. However for smaller pump stations requiring only small air extraction rates, a far simpler solution is an ARMATEC Green Dome Odour Filter.

Green Dome Odour Filter Design

Standard ARMATEC Green Dome Odour Filters are in two parts: (1) the base module is designed to be partially buried to minimise the visual impact, and (2) the top module that fits over the base module and is externally coloured in a shade of green. Alternative designs with the complete unit located above ground are also available.

The units are designed for a very low pressure drop to ensure the air can exit the pump station via the unit. It is essential that the pump station is well sealed to contain the odours and ensure they exit via the odour filter. ARMATEC guarantees that the pump station will be odour free if the pump station is fitted with a "sealing pump station lid" ... contact ARMATEC if you do not have a supplier for these. The low pressure drop ensures minimal back pressure on the pump station, and is achieved by selecting a large diameter in combination with a shallow carbon bed depth. Sizes range from 500mm diameter to 1200mm diameter. Please contact ARMATEC for sizing.

Green Dome Construction is Vandal Resistant

The Green Dome Odour FIlters are constructed in robust fibreglass. They will require very little maintenance throughout their life. The fibreglass will withstand the odd knock without cracking. Any graffitti can be easily removed with standard removal products without damaging the fibreglass.

Carbon Life

ARMATEC Green Dome Odour Filters are fitted with proven carbon media formulated for humid airstreams. The carbon is low cost, and easily replaced when necessary. The carbon is either loose or contained within a replaceable bag, and this avoids personnel having to handle the "dirty" carbon. ARMATEC supplies replacement bags of carbon that you can keep in stock ready to make the changeout.

The life of the carbon depends on the air flow, the concentration of hydrogen sulphide odours, and the quantity of carbon in the unit. The carbon in a typical ARMATEC Green Dome Odour Filter will have an estimated life of 2 to 5 years.

Minimum Visual Impact

The overall low profile minimises the visual impact of the Green Dome Odour Filter, especially when the adjacent area is planted out. The top module is readily removed when the carbon needs to be changed. Pipe connections are hidden underground. The unit can be located up to 10 metres away from the pump station if required to further reduce the visual impact.

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