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Q.E.D. Environmental Systems


QED Environmental Systems design, manufacture and support environmental technology solutions for groundwater, soil and gas management applications into industrial, environmental and energy markets worldwide. Its corporate headquarters are in the USA which support the North, Central and South American markets. QED’s International office covers Europe, the Middle East, Africa and Asia-Pacific. The company’s focussed vertical markets include remediation, landfill, biogas, medical and food and beverage. QED has an extensive network of established international distributors, enabling it to provide its products, services and support in a local language to over 60 countries throughout the world. QED also has a strong portfolio of acquired product brands including Geotech, Landtec and Viasensor gas analysers, En Novative Technologies soil sampling products and Snap Sampler groundwater sampling solutions.


Cyan Park Unit 3
Jimmy Hill Way

Laser gas detection success for Anglian Water Services

The Geotech TDL-500 gas detector
Biogas gas analysis

Anglian Water Services (AWS) wanted to quantify methane emissions from their wastewater treatment processes. As these are less well understood and less well defined than indirect carbon emissions associated with electricity use, they set up a project to locate and quantify emissions from the processes at a wastewater treatment works.

This was led by the in-house Innovation Team which undertakes research and development to deliver environmental benefit, cost saving and operational efficiency. A laser-based TDL-500 portable methane leak detector supplied by Geotech was used for the project. In the three-month study they pin-pointed and quantified methane emissions around the plant, including those around secondary digesters, activated sludge plants, anaerobic digesters and gas holding tanks.

"We were able to successfully confirm patterns of methane emissions from activated sludge lanes, backing up results found worldwide by others studying similar trends in the literature. We were also able to use the TDL-500 probe to quantify methane emissions from the surface of secondary digesters. The TDL-500 was selected due to its accuracy in measuring methane with a sensitivity of 1 ppm. Its portability and ATEX certification were also vital in this project as it was used in potentially explosive zoned areas around anaerobic digesters. A critical benefit of the TDL-500 in this project was its ability to measure methane concentrations in two ranges (0-10,000 ppm and 0-100% volume gas). This was of great importance as gas emissions from various processes were analysed, all of which contained different concentrations of methane," said Astrid Bosmith, Innovation Technologist with AWS.

AWS serves around 5.8M waste-water customers and operates 1,114 waste water treatment works.

The Geotech TDL-500 gas detector
Using laser spectroscopy technology, the Geotech TDL-500 can detect methane leaks in applications ranging from natural gas pipelines to landfill or coal mining sites. The tunable diode laser detects methane at 1ppm. ATEX certified to Zone 1, it can be used in most hazardous areas, detecting methane leak locations with speed and precision.

The laser technology, unlike FID devices, does not need a flame or a hydrogen gas supply, avoiding transportation of hazardous gases. Fast response times mean less time spent monitoring and GPS helps record leak position, set up routes and record readings. The portable TDL-500 laser leak detector is easy to carry for one person to use on foot. It lasts 8-10 hours between charges. Users are likely to be involved with natural gas networks, landfill gas surface emission checking, biogas feeds to CHP engines, water treatment plants, momentary methane leak detection and sewerage system methane detection.

Biogas gas analysis
Wastewater processing gas leak detection with Geotech equipment is a very helpful addition for waste-water treatment site operators. Many of these already use Geotech portable and static gas analysers to check biogas production volumes and quality ahead of using it in CHP engines to produce electricity and heat.


For further information please email Geotech

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