BSEE-OCT21-PG18 Pumps.qxp_Layout 1 15/09/2021 17:43 Page 18


BSEE A


Faye Brophy Head of Industrial Axair Fans UK Limited


The industrial fan, often the work horse of many industrial systems, is an important component in the water treatment process. By efficiently extracting gases, vapours and fumes, the fan keeps workers safe in a toxic and corrosive environment. Faye Brophy, head of Industrial at Axair Fans UK elaborates


WASTE MANAGEMENT & WATER TREATMENT Ventilation in the water treatment process


dhering to strict regulations and delivering water that is safe for human consumption, reliable and cost effective is crucial in the water treatment industry. According to the World Health


Organisation, contaminated drinking water causes 485,000 deaths every year. Contaminated water can transmit diseases such as diarrhoea, cholera, dysentery, typhoid, and polio.


However, the UK’s water is one of the safest and purest supplies of water in the world because of meticulous legislation and industry regulations. Water quality varies by region, but chlorine and dissolved minerals are almost certain to be found in your water supply.


UK water must be fit for human consumption by law and is tested daily to keep up with regulations. Delivering a safe and reliable source of the highest quality drinking water using the most advanced solutions is vital in this industry. As stated on the direct Gov website, 99.97% of water samples in England and Wales met the Drinking Water Inspectorate’s standards in 2013. Environmental wastewater treatment plants face a number of challenges in terms of ensuring safe and effective ventilation. Water treatment processes must control hazardous substances, chemicals and gases such as methane, ammonia, phosphorous, pesticides and carbon dioxide. Consequently, wastewater treatment plants are, by their nature, one of the harshest engineering environments.


Not many of us think about the components involved in the intensive process of water treatment and simply take clean water for granted. By efficiently extracting gases, vapours and fumes, the industrial fan is an important component in the water treatment process as it effectively ensures the safety of workers in an often toxic and corrosive environment. The corrosive nature of the air to be extracted means that standard metal fans would be adversely affected and not withstand the environments for long, therefore polypropylene fan components, sometimes ATEX certified, are generally used in this application over their metal counterparts. Where are industrial fans required in the water treatment process?


There are a number of processes that the water treatment industry use. Coagulation and flocculation are often the first steps in water treatment. Chemicals with a positive charge are added to the water. The positive charge of these chemicals neutralises the negative charge of dirt


and other dissolved particles in the water. When this occurs, the particles bind with the chemicals and form larger particles, called floc. To separate the floc from the water, it is allowed to settle and fall to the bottom of the water during the sedimentation process. The clear water is then passed through various filtration compositions and sizes to remove any remaining dissolved particles. Finally, the water is disinfected with further chemicals, such as chlorine, to kill any bacteria and protect the water as it is piped to homes and businesses.


The chemicals used during the water treatment process pass through metering equipment in a dosing system. In the system, the solution is at its strongest and the chemicals are often corrosive and can be flammable. The plant room or dosing cabinet needs to be ventilated to prevent a harmful build-up of chemicals in the air around the equipment. Plant room and cabinets can be exhausted directly to the outside air or, more commonly, through an air filtration system. A filtration system is the more environmentally friendly as it keeps the air surrounding the water treatment site clear of harmful chemicals.


Choosing the right equipment for a water treatment plant will depend on the properties of the water and the concentration of any contaminants present but an effective corrosive resistant ventilation ensures safe, clean air for employees, removes hazardous pollutants from work zones to protect systems and equipment, controls the air in and around the treatment plant, manages odour and temperature control, prevents condensation build up so reducing corrosion or fungus, and extracts smoke in the event of a fire.


To ventilate wastewater treatment plants, engineers now have a huge choice of materials for industrial fans and their ventilation systems. Typically, these materials are stainless steel, glass reinforced plastic (GRP), or polypropylene. The range of corrosive gases present in the plants is so vast that it is essential to select ventilation equipment that is resistant to the largest array of chemicals possible, and polypropylene leads the way in chemical applications such as water treatment.


LG launches new wall­mounted hydro kit for domestic hot water


The hydro kit is an indoor unit that can connect to LG Multi V VRF Systems – Multi V 5 and Multi V M, Multi VS and the R32 Multi VS Compact units. The unit utilises wasted heat from cooling and transfers this to the hydro kit for the production of hot water. It comes with a water flow temperature for heating of a maximum of 50°C and cooling temperature of a minimum of 5°C. The new wall-mounted hydro kit unit comes in a range of sizes to meet any requirement – from 5.5kW up to 9.0kW – and is compatible with low GWP R32 refrigerant, incorporating integrated water side components to reduce installation time and cost, and offers space saving benefits and easy maintenance.


R


enewables manufacturer LG has launched its new wall-mounted hydro kit for the production of hot water in domestic and small


commercial/retail/office type settings.


The new hydro kit can be used with the heating priority function that provides initial cost saving and user convenience. Also, domestic hot water is always available, even during the cooling season without manual mode changes.


The intuitive user interface (UI) is easy and quick to use and users can set schedules based on their lifestyles. Daily or monthly power consumption monitoring allows for efficient energy management.


Users of LG’s ThinQ™ app, can simply control the cooling or heating system at anytime, from anywhere – the remote access to the system allowing users to maximise comfort levels.


www.lg.com/uk/ business/inquire-to-buy


18 BUILDING SERVICES & ENVIRONMENTAL ENGINEER OCTOBER 2021 Read the latest at: www.bsee.co.uk


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50