Air Monitoring - UK Focus iii Commercial Trials of Airborne Air Quality Mapper Announced
Aerial mapping company Bluesky is launching a service to map air quality across towns and cities. Having successfully completed a project to map air pollution in the city of Leicester Bluesky is seeking new sites in the UK to trial its ground breaking survey technology. Using a world first spectrometer, developed by scientists at the University of Leicester, mounted on an aerial survey plane the system can accurately record levels of nitrogen dioxide across entire cities. The colour coded air pollution maps can be overlaid on digital maps or online mapping systems such as Google Earth.
“Air pollution is a real and present environmental threat to public health in the UK,” commented Bluesky’s Technical Director James Eddy and Industrial Associate at the University of Leicester. “Having successfully deployed the Airborne Air Quality Mapper for the first time over the skies of Leicester we are keen to trial the system in other UK cities and locations to obtain comparative datasets.”
In the World Health Organisation European Region exposure to air pollution is said to decrease the life expectancy of every person by an average of one year. While lower than other parts of the world a recent study saw this figure rise to 22 months in at least 25 European Cities. Defra (Department for Environment, Farming and Rural Affairs) estimates that air pollution reduces average life expectancy in the UK by 7-8 months, costing the UK £20bn per annum.
“The significance and potential impact of air pollution is well understood,” continued Eddy. “It is also accepted that exposure to air pollutants is largely beyond the control of individuals and therefore requires action by public authorities at the local, national, regional and even international levels. By capturing accurate, reliable and up to date information that can be easily understood and communicated we are trying to arm those responsible for managing our cities and protecting our health with the data they need to make informed decisions.”
The Airborne Air Quality Mapper (AQM) trials will utilise the University of Leicester’s world leading Compact Air Quality Spectrometer, mounted on a dedicated aerial survey aircraft. The device monitors visible light and measures how much light is lost at specific wavelengths absorbed by NO2
. The technology has previously been used as part the CityScan project with devices mounted on tall buildings in Leicester,
Bologna and London during the Olympics to build 3D maps of pollution across the cities. Nitrogen dioxide (NO2
boiler or power station. There is clear evidence that high levels of NO2 Biogas Desulphurisation System Reduces Costs at Waste Management Site
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The commissioning of a new cost-saving microbiological desulphurisation system at the Cory Waste Management site in Weston-super-Mare is the result of a successful collaboration between Uniflare, the Warwickshire based environmental technology specialists and Allison Engineering – both ADBA members.
Uniflare’s expertise in designing, manufacturing and installing landfill and waste gas control treatment and use equipment, combined with Allison Engineering’s range of innovative gas analysers, has enabled Cory Waste Management to protect its combined, heat and power (CHP) plant at minimal installation and operational cost.
As part of the overall Uniflare gas train package the desulphurisation system at the Cory site features the Allison Engineering AWITE Biogas analyser which is supplied with its own air compressor and uses a combination of PID and Fuzzy Logic control to automate the injection of small quantities of air (0.5 to 1%) into the gas stream within the digester. The oxygen converts the hydrogen sulphide (HS) to elemental sulphur and water, a process which is completely automatic and does not require any operator input and so eliminates additional operational and maintenance costs.
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The HS concentration in biogas from anaerobic digestion (AD) can be up to 2,000 to 3,000 ppm. When the biogas is burnt in a CHP plant to generate electricity the H S breaks down, producing a weak sulphuric acid that can cause corrosion within the engine, leading to increased maintenance costs and downtime. For this reason many engine manufacturers stipulate a maximum H2
S concentration in their warranties.
One of the most common ways of reducing the H2 into the digester slurry or feed substrate, converting the H2
S concentration is to inject iron chloride S into iron sulphide particles. Whilst
this is very effective it requires additional process control functions with dedicated pumps and storage vessels and therefore has associated on-going operational costs. James Hladkij, the AD Technician at the Cory Waste Management site in Weston-super-Mare said: “We need to protect our CHP plant operations and maintaining H2
S concentration levels to less than 300 ppm is
essential part of this process. The Uniflare system has enabled us to achieve levels of less than 100 ppm and at minimal operational cost.”
From small agricultural sites to larger industrial AD plants, accurate and dependable online as composition analysis is an essential part of this process and the Awite range provides a wide choice of options. The range comprises the Awi-Eco, a low cost, compact discontinuous analyser which provides 50 CH and CO measurements per day, with 4-20 mA output and USB connection. For more sophisticated monitoring and analysis requirements the Awi-Flex provides continuous measurement for CH2
, CO2 , H2 S, O2 and H2 . This system provides up to
five measuring points; ethernet, profibus, modbus and USB connection. Most importantly, it can also be used to take flow, temperature and pressure inputs and undertake automated desulphurisation control. All Awite analysers use a rugged, touch screen industrial interface which allows easy access to recorded data, sensor parameters and system diagnostics. This ensures that all information is instantly available, remotely.
Ultrasonic Wind Sensor Certified for Hazardous Environments
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With IECEx, WindObserverIS can provide high quality data and reliability to similar applications and new markets including the USA.
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The WindObserverIS provides highly accurate measurements of wind speed and direction and can be installed in hazardous and explosive atmospheres found in marine, offshore and other environments where significant quantities of flammable liquids, vapour and combustible dusts could cause fire or explosion.
WindObserverIS measures wind speeds of 0-75m/s and 0-359° wind direction in extreme environments, remains operational in temperatures from -30°C to +70°C and offers low start- up speeds of 0.01m/s. It has no moving parts, is lightweight and constructed from stainless steel to provide extreme durability with little need for maintenance, ideal for long term installations in areas where access is difficult. Sophisticated error checking and fault reporting, gives users full confidence in the quality of WindObservers reported data.
Tony Stickland, Director at Gill Instruments comments, “Electrical safety is of primary importance in hazardous atmospheres and gaining IECEx certification is important for our continued expansion into new markets including the USA.”
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The Gill Instruments WindObserver Intrinsically Safe ultrasonic anemometer is now certified by the International Electrotechnical Commission (IEC) for use in explosive atmospheres (Ex). Gill has added IECEx to existing safety ATEX certification already held for its market leading anemometer, which is widely used across the world.
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www.envirotech-online.com IET March / April 2014 A member of AL0831 STA A4 Advert 2014_Layout 1 15/11/2013 16:42 Page 1 ) is part of a group of highly reactive gasses known as nitrogen oxides. NO2 forms quickly when fossil fuels are burned for example petrol or diesel in a car or natural gas in a domestic are linked to adverse effects on health including increased risk of respiratory illnesses such as bronchitis and even heart attacks and
World Health Organisation statistics show 1.3 million deaths worldwide result from outdoor air pollution.
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