Electricity and Control August 2023

PLANT MAINTENANCE, TEST + MEASUREMENT

Smart asset management in tackling water scarcity With hundreds of measurement devices of different types and ages typically fitted in a water treatment plant, it can be challenging for operators to manage every single one to ensure they are working at their optimum. Sabyasachi Bhattacharyya of ABB Measurement & Analytics, explains how smart asset management systems can address this challenge and help deliver the accurate measurement performance needed to manage water supplies more sustainably. T he prospective problem of water scarcity is increas ingly leading to a search for new ways of managing the world’s water more sustainably. A combination of

extreme weather, outdated or inadequate infrastructures, and insufficient investment has meant that growing atten tion is being paid to the way water is being used, even in countries that traditionally have been accustomed to hav ing abundant supplies available. Of particular concern is the United Nations’ estimate of a potential global water deficit of 40% by 2030 [1] , as demand substantially outstrips the earth’s finite available supplies of freshwater. Already, some 2.2 billion people do not have access to safely treat ed water supplies, and 4.4 billion live in areas with little or no sanitation [2] . With the global population estimated to increase by a further two billion by 2050 [3] , new means and methods need to be found to improve the way in which water is managed, from the production of potable water to the discharge and reusability of wastewater. Much of the potential solution lies in the hands of the world’s water utilities, which are coming under mounting pressure to optimise their supply and treatment infrastructures to help maximise the amount of water available. Improvement starts with measurement Whether it’s producing safe, high-quality water for drinking or returning industrial effluent to a state suitable for dis charge into the environment, treating water is a complex business comprising multiple processes. The interdepend ent nature of these processes, coupled with targets and regulations relating to potable and wastewater quality, makes it essential to ensure that each process is working at an optimum level. This requires large numbers of instruments and analys ers measuring a wide variety of parameters, many of them on a continuous basis. Parameters measured can encom pass pressure, temperature, flow and level as well as pH, conductivity, dissolved oxygen and turbidity, plus chemi cal and mineral concentrations such as chlorine, fluoride, aluminium and iron. Other instruments might also include positioners, which are used to control valves in pumping and dosing applications. As well as measuring the quality of the water being treat ed, the instruments and analysers help operators to assess

Water treatment, typically entails multiple processes and requires multiple measurement instruments, monitoring a variety of parameters.

Smart asset management systems, with the ability to collect and monitor data in a unified environment and in real time, have the potential to transform plant and process performance. other crucial areas of performance such as efficiency, en ergy consumption and potential maintenance requirements of the equipment. Using measurement as a way of determining plant per formance and the long-term accuracy of instruments and analysers is especially valuable. Typically, many water treat ment plants will have a lifespan of 40 to 50 years, with much of the treatment equipment, including some measurement devices, lasting for around 20 years. Consequently, much of a site’s installed base of instruments and analysers will tend to be of mixed ages, with different levels of technol ogies, different communications standards, and possibly, different operating principles.

AUGUST 2023 Electricity + Control

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