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Automation Technologies 3/2014

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Automation Technologies 3/2014

Sensors and Measurement

Sensors and Measurement Robust pressure and conductivity measuring technology helps with sea water desalination Supply of the people of the world with potable water is one of the biggest challenges of our time. In regions with a lack of fresh water or with contaminated ground and surface waters, desalination of sea water helps cover the needs. This article describes the procedure of reverse osmosis and the role played in this by Jumo measuring technology for pressure and control capacities. back to current issue AUTOMATION TECHNOLOGIES 3/2014

Sensors and Measurement next page Filtration - Fill level - Indicator Pre-treatment (chlorination-dechlorination, pH regulation) - pH value - Chlorine - Controller Storage - Fill level - Indicator - Flow rate - Indicator Registration unit Sea water Reverse osmosis Aftertreatment - Redox (Disinfection) - pH value - Conductivity - pH value - Pressure - Chlorine - Indicator - Controller 01 The figure shows the process of sea water desalination with the process parameters to be monitored More than 70 % of the world are covered in water. Only 2.5 % of this are fresh water, however. Two thirds of the fresh water are bound in ice at the poles and thus not accessible as drinking water. The drinking water demand is rising due to the growing population and industrial development. In areas with little or contaminated ground and surface water, sea water desalination for production of drinking water is important. For best water quality, parameters such as pressure and conductivity must be monitored and controlled continually. For this area of measuring technology, Jumo offers process sensors and the matching measuring converters or controllers. How does sea water desalination work, and what benefits do the products of the Fulda measuring technology specialist bring? High salt content may cause measuring errors Sea water desalination is a very elaborate procedure from chemical, energy and operational points of view. Thermal procedures are one option for desalination: sea water is evaporated and the steam condensates. Additionally, diaphragm procedures such as reverse osmosis, nano filtration or electro dialysis are used. Reverse osmosis is the most common method. The separation process in reverse osmosis (RO-system) is based on the diffusion effect. In this process, the sea water to be treated is pressed through a synthetic diaphragm with more than twice the osmotic pressure, i.e. 60 to 80 bar. Only water molecules pass the correspondingly fine pores then, AUTOMATION TECHNOLOGIES 3/2014

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