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After the ozone treatment, the raw water to be purified goes through a rapid filtration process. This takes place in four filter chambers switched in parallel. In contrast to ozonisation, an extra startup bleeding is not required in this case. This task is performed by the separate exhaust air dampers that are also used to flush the vessels with air. Residual ozone may arise during all the processes of the rapid filtration step. It must continuously be supplied to the residual ozone destruction plant and it is mandatory that all valves be designed for this purpose.
With 2,800 Nm³/h required for draining and 10 Nm³/h for separate air release during operation, the volume range within the rapid filtration step is really large. To cover the requirements in this area, a combination of valves with specific characteristics is the best way to a convincing overall concept.
During draining of the fast filtration line the vacuum breaker VV 34 DN 200 is recommended for rapid ventilation. In this system solution it does not assume any function for the startup and / or continuous bleeding and venting operation because this task is being fulfilled by the valve EB 1.74 DN 100. For operational air release in the pipelines the EB 1.12 G ¾ is installed. All Mankenberg components of this concept are ozone-resistant.
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