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ATi has embarked on a large scale project with South West Water to help further improve wet gas odour, to ensure they remain above and beyond regulation standards.


SWW logo


The forward-thinking project involves South West Water investing in ATi’s proven odour control system, which gives them early warnings on H2S.


SWW selected ATi’s H2S Wet Stack monitors following a long term good working relationship, enjoying ATi’s excellent customer support. In addition to this, ATi’s Q45S monitors are a proven system and competitively priced and following a successful installation, SWW is now looking to roll out its programme across all their tourist sensitive sites.


The Q45S is designed to work in wet stack environments and is directly inserted. This eliminates complicated and maintenance intensive sample conditioning systems.  Direct measurement also eliminates any dilution of the gas prior to measurement.


SWW wet stack 2With a low capital cost and very low running costs the Q45S offers H2S measurement with a significantly lower whole life cost than other types of technology.  For example, replacement sensors for the Q45s are around £200, with a lifetime of 12-24 months.  The system usually takes less than 3 hours to install and calibrate and maintenance is no more than a monthly inspection.


Continuous monitoring of hydrogen sulphide in both inlet and discharge air has presented problems for standard sulphide gas sensors. Analytical Technology has developed this ground-breaking sensor technology that allows continuous monitoring in this type of application, where condensing humidity conditions are normal. The Q45S system utilises a sensor designed to operate in condensing gas streams without the water vapour blinding, which can be typical of standard sulphide sensors.


The use of scrubber systems is often required for odour control in wastewater treatment plants and sewage collection systems. A wet process using hypochlorite solution to remove H2S from air streams prior to discharge is often employed. Analytical Technology’s Q45S odour monitoring system employs a wet H2S sensor and measurements can be made either at the inlet to scrubber systems or at the outlet. For duct insertion and flowcell use, special sensor configurations are available.


SWW wet stack 1The Q45S system from Analytical Technology is capable of monitoring H2S in gas streams with condensing levels of water vapour, as water droplets that could present a barrier to the diffusion of H2S are eliminated from the sensor. An automatic system for purging accumulated droplet water from the face of the sensor ensures long-term operation without loss of sulphides in condensed water. Additionally, an optional air-purge system controlled by the transmitter periodically delivers a blast of air across critical sensor surfaces to remove water droplets. The Q45S system ensures a clear gas diffusion path to the sensor and reliable measurements on a continuous basis.


A special battery-powered version of the Q45S is available for use in temporary installations and data is easily downloaded to a standard PC using software supplied with the unit. This system runs on an internal nine volt battery which will operate the unit for four days, while a nine volt lithium battery will provide about 10 days of operation.

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