iv UK Focus


Technology Supports Air Quality News Stories The latest air quality monitoring equipment


from the company Air Monitors has been used extensively by a variety of news channels to support the ever-growing media attention being given to urban air quality. “In contrast with the air pollution of the 1950’s, the problem is no longer visible,” says Managing Director Jim Mills. “It used to be possible for city dwellers to see the smog, but monitoring technology is necessary to highlight today’s invisible threats; which are mainly fine particulates and nitrogen dioxide (NO2


).


“We have been happy to support the media in its efforts to highlight the problems that exist in our towns and cities, because the


public needs to be made aware of this very serious threat, and because the development of lightweight, accurate air quality monitors has meant that it is now possible to identify the precise location of pollution hot-spots.


“The use of our instruments on TV news channels reinforces the public health dilemma that we face; by showing the problem on the streets, where people live and breathe. This helps those that live in towns and cities to understand that air pollution affects them, their lives and the lives of their children.”


TRT World is a 24 hrs/day news channel focusing on global issues. Their Sara Firth recently used the Fidas Frog from Air Monitors to highlight the fine particulate problem on London’s streets. She also interviewed Steve Hoskin from Air Monitors who showed the film crew how to operate both the Fidas Frog and a new portable, wireless NO2


Fowlmere Gets the Nitreat Treatment Nitrate Removal Plant Success for ACWA Services Tops 30 Sites


Water and wastewater solutions provider ACWA Services starts 2017 with three new design and build contracts for nitrate removal plants worth in excess of £3 million, including a new solution for Cambridge Water at Fowlmere WTW.


All plants will utilise ACWA’s highly successful ion exchange Nitreat technology, already deployed at 27 water treatment works (WTW) in the North and East of the country to ensure drinking water quality in line with DWI quality targets, within Nitrate Vulnerable Zones (NVZ).


monitor. Sara said: “We were obviously aware of the ambient air


quality problem, but talking to Steve we were alarmed to learn that indoor air quality can be significantly impacted by outdoor pollution.”


Employing the same technology as the Fidas 200, which is increasingly used in reference monitoring stations, the Fidas Frog provides simultaneous measurement of PM1, PM2.5, PM4, and PM10 particle size distribution in a portable, wireless, battery-powered instrument.


Following Sara’s report, TRT World interviewed Simon Alcock from ClientEarth who explained that in urban areas diesel vehicles are the source of the air quality problem which imposes an enormous burden on health and the economy.


For a week in March 2017, the BBC broadcast a special series of stories titled ‘SoICanBreathe’ which looked at the air pollution problem. For example, in the BBC’s Inside Out West programme, Seb Choudhury revealed the shocking results of air quality tests in Bath using an AQMesh from Air Monitors. Data from an AQMesh monitor on a bicycle was compared to another inside a taxi. Interestingly, the data showed much higher levels (exceeding World Health Organisation limits) inside the taxi compared with the bicycle data.


Looking forward, Jim Mills says: “Air pollution will remain in the headlines until the measured levels of air pollutants remain below the limits set by the WHO and the European Union. Clearly, the UK’s exit from the EU presents a threat to the environmental regulations that have highlighted the problem and enabled ClientEarth to take the government to court. However, I believe that the number of premature deaths, coupled with the enormous costs to the NHS will be too great to ignore.


“It is also clear that recent advances in technology are making it possible to measure local air quality in an enormous number of locations, and this will have a major impact on people’s lives. The availability of local air quality data will mean that air quality will start to affect house prices and even the choices that people make when selecting a school for their children.


“Inevitably, there will be more low emission zones and further initiatives to reduce the number of diesel engines in urban areas. However, indoor air quality is becoming an increasing concern and again monitoring technology will perform a vital role in helping to identify problems and as part of effective building management systems.”


Visitors to AQE 2017 will have an opportunity to see the latest air quality monitoring technology from Air Monitors on stands 3 & 4. Registration for the Telford event (24-25 May) is now open at www.aqeshow.com.


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For lead contractor Integrated Water Services (IWS) work is due to commence at Cambridge Water’s Fowlmere WTW to the south of Cambridge in September. The new plant, which follows the completion of projects for Cambridge Water at Babraham, Euston and Fleam Dyke, is designed with sufficient capacity to treat a raw water flow of 5,400m3 per day from onsite boreholes, reducing nitrate levels of 79.6mg/l to produce a final blended water flow with nitrate levels at 43mg/l.


For all three projects ACWA is responsible for process, mechanical, electrical and instrumentation works, through to commissioning. The solution at Fowlmere WTW will incorporate a single Nitreat skid complete with transfer pumps, self-backwashing micro strainer, a duplex water softener system, brine system for regeneration (with a single salt saturator located outside within a bunded area), waste tanks plus interconnecting pipework and valving along with a dedicated MCC control panel and associated cabling. IWS will also be responsible for civil works including the treatment building and work is expected to be completed in June 2018.


ACWA’s Nitreat system is a counter current continuous Ion Exchange process for nitrate removal utilising a patented multi-port distribution valve. This distributes the feed and regeneration flows to multiple resin pressure vessels within the system.


The benefit of this approach, aside from its small footprint, is that it replaces traditional ‘batch’ treatments requiring ‘Standby’ resin vessels. Instead all aspects of the process - adsorption, displacement, brine regeneration and regeneration rinse - operate continuously within a single process stream.


Waste production is also a fraction of that of conventional plants, typically less than 0.5% of the works flow compared with up to 10% for some systems and the system is also able to cope with large variations in flow and nitrate levels.


Commenting on the new contracts Peter Brewer, ACWA Services’ UK General Manager said: “Our 30th contract for Nitreat marks a great start for 2017. The system is already bringing significant operational benefits for our UK water industry customers and full compliance with water quality standards. Rising nitrate levels are a continuing issue and through a programme of continuous improvement we are working hard to ensure highly reliable, low cost solutions to meet demanding cost efficiency objectives and rigorous discharge limits.”


Water Quality Testing Probe, to Aid Ongoing Research into


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the Environmental Sector A world renowned public research university, located in central London, recently approached Bell Flow Systems with a requirement for a multi-parameter water quality testing probe, to aid ongoing research into the environmental sector. It was important for the research that the probe was able to measure dissolved oxygen, pH, turbidity, and ammonium, at multiple measuring points. Ideally being able to record the data internally throughout a whole day’s worth of field testing.


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For this application, Bell Flow Systems provided the IP68 rated AP-2000 Advanced Multi-parameter water quality probe, with an optical ammonium sensor. The AP-2000 is the smaller of the Aquaread range of advanced portable multi-parameter water monitoring probes. A range of standard sensors included as a standard, however it also allows you to add even more sensors to the probe for full customisation.


Additionally the probe was supplied with a GPS Aquameter which enables live readings, automatic data recording and probe calibration. The sensor probes in the Aquaread range are constructed from tough marine grade aluminium, making it suitable for use in both fresh and salt waters.


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