A1- Cbiss Stand No. L2150

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31 May 2016 | Updated 01 January 1970

Hydrogen Sulphide (H2S) is a gas that is present in waste water applications. It is notorious for its corrosive effects which is damaging to infrastructure and the strong egg-like odour that it produces which causes nuisance smells.

 

Corrosive Damage

With H2S in waste water, the pressing concern is the corrosion that it causes, which then has a knock on effect. Initially bacteria oxidises H2S into sulphuric acid on pipes and concrete surfaces. This causes corrosion which then exposes reinforcing metal and corrodes it. Through the corrosion, pipes will become damaged and create leaks causing the wastewater to become diluted.

Repairing pipes due to this kind of damage can become a hassle, as it is costly and unsafe to enter into the sewers. Additionally, if the pipes are located in a residential area then it causes residential grievances.

 

Nuisance Odours

During the warm months of the year, the smell that is produced from H2S becomes even stronger. Waste water plants that are situated near to neighbouring residential areas often receive complaints about the nuisance odours.

If you are continuously exposed to H2S, damage can be done to the olfactory nerve. In layman’s terms, the senses in the nose are dulled and without realising, it can be having a harmful effect on your health. This is why H2S must be dealt with as a preventative approach – being preventative requires continuous monitoring and data logging.

 

Odour Abatement

Drainage authorities and water companies carry out odour abatement at waste water and sewage treatment works where they process sludge and waste water to control the levels of H2S. This is an extremely sceptic process and odours must be controlled by a combination of liquid dosing and dry scrubbing technologies.

Liquid dosing is intended to reduce the sulphide levels to an acceptable level prior to the dry scrubbing system, so that the final scrubbing leaves a gas stream in a non-noxious state.

Gas detection equipment is integrated into a dosing system to log levels of Hydrogen Sulphide (H2S) allowing the dosing chemical to increase or decrease in reaction to the H2S levels. This provides a fully automated odour abatement chemical dosing system.

 

The Problem with Traditional Gas Detectors in Sewers

Traditional gas detectors can fail to monitor gas within the sewer network due to the sensitive conditions that the gas sensor is exposed to. High humidity and increased toxicity may damage the sensor much more quickly than ‘normal’ operating conditions. The lifetime of electrochemical sensors can significantly reduce if continuously exposed to target gas in high concentrations. This causes sensor poisoning.

 

The OdaLog Solution

To treat the source of H2S within the sewer, the OdaLog a portable gas logger, is designed to be robust, small, and able to log data for extended periods of time making it a unique datalogging product of its kind. The OdaLog’s design provides enhanced sensor protection allowing it to be left in-situ for up to 4 weeks. The OdaLog incorporates a bull ring on the top of it, which allows a chain or a similar object to be attached so it can be safely lowered close to the source of H2S emissions, such as within sewerage pumping stations and manholes.

The OdaLog is perfect for data monitoring as its results can easily be captured and displayed using the accompanying OdaStat-G software when hooked up to a laptop or a PC. The OdaLog logs levels of H2S at Parts Per Million (ppm) with a resolution down to 0.1ppm.

 

Boundary Monitoring

Nuisance odours that emulate from industrial plants are a problem for neighbouring communities. Wastewater treatment plants must appropriately manage their toxic emissions to reduce exposure of harmful toxic levels.

When complaints are raised by neighbours, sites require gas monitoring data to be able to argue their case for whether their process is the cause of the bad smells. To be able to produce these reports, boundary monitoring is deployed along the fenceline surrounding the facility to continuously detect toxic airbourne gases at low ppb levels.

Data is transmitted back to a central computer via a real-time communication network to collate the data and produce these reports.

 

Cairpol Monitors

Cairpol allows new real-time measurement of gas pollutants (H2S, O3, NO2, NH3, SO2, CO) with some measuring down to very low ppb concentrations – the types of monitoring which previously was too costly with conventional monitoring systems.

Cairpol requires ultra low power consumption and can be powered using solar energy in some countries. However a1-cbiss would recommend that the system is mains powered to ensure 24/7 operation.

The Cairpol is compact, autonomous, easy to set up, and the sensitive sensors can be used reliably even in extreme conditions.

Cairpol systems can be networked to provide optimal coverage and measurement of airbourne gases over a vast area from a single computer.

With CairMap, it is possible to show real-time fugitive emissions of a multi-source installation for the management of events and processes. All sensor readings are available on a 24 hour / 30 day scale and is displayed and represented by a colour scale level of concentration.

To register to see this company at the Protection Series, Click Here The Facilities Show gives you access to the complete Protection Series of events 

Article written by Show Editor | Published 31 May 2016

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