The design of an advanced water reuse facility for the city of Jeddah in Saudi Arabia is described. This plant will take effluent from an existing waste water treatment plant and treat it to conform to WHO chemical and physical guidelines.
In order to achieve these standards, particularly in terms of dissolved solids, a reverse osmosis stage is included.
It is believed that the facility will be the first major reuse scheme in the Middle East incorporating this process and that the plant is one of the largest of its type in the world.
Before finalising the process a series of laboratory analytical and treatability studies were undertaken. These proved to be critical and resulted in several significant changes being made in the conceptual design.
Results from these tests are presented showing the effect of the different coagulants, reaction pH, oxidant and process sequence. Particular emphasis is placed on the ability of the different processes to produce water suitable for using as feed for the reverse osmosis plant.
The final process design resulting from these tests, and other considerations, is presented, together with anticipated water analyses after each process step.
Finally, the whole plant is described.