Design Aspects : Page 3

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A treatment plant consists of different parallel treatment lanes or units to increase reliability. for example a unit is out of operation because of maintenance or cleaning, the other parallel units can take over the flow, avoiding an interruption in drinking water production. The parallel units and the treatment processes in series must be operated in such a way that always, so 24 hours per day, sufficient water can be produced to feed the clear water tank. Therefore sufficient valves and pumps must be available in the treatment plant.

However, the installation of too many control devices increases costs and complicates operation. In the process flow diagram the optimal division of control devices is indicated. Finally the treatment plant must be positioned in a building. The building must be compact to diminish investment costs, but the treatment processes pumps and valves must be accessible for maintenance and repair.

 
For operation the layout of the building should be clear and logical. In the cross-sections it becomes clear what the functional design of the treatment building is, where storage chemicals is situated and how maintenance and repair can be performed. The functional design of the treatment building should be made in good cooperation with the architect.
 
Normally, the treatment building is part of a protected natural area, where restrictions apply for buildings fitting in the environment. After the final design of the treatment plant the entire cycle of construction can begin, which is a separate specialization, where not only technical but also political and managerial skills are needed. Contractors will play an important role in this phase, where the water companies have the responsibility in supervision in order to secure that all anticipated functionalities are provided.



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