Mahmoud, There are a lot of ...

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Mahmoud,

There are a lot of comments here but there your post is short on data.  Removing oil from water is generally easily done - many technologies will work...and work well.  

1. "Source water" - for potable use? Industrial plant make up water? Food industry?  Hydraluic Fracturing?  Depending on your answer, the appropriateness of one possible solution versus another can change significantly.

2. What s the TPH concentration?

3. If TPH concentration is in "mg/l range" (as opposed to %s)...Do you have any droplet size data?

4. Is the oil free, dissolved or emulsified?

5. Are there (total) suspended solids (TSS) associated with the oil?  (Particulate (suspended solids) are frequently involved in stabilizing emulsions even micro-emulsions.   If there is 50 mg/l or greater TSS, particle size distribution data would be important information for the process selection/design.  In addition, either an assay of the solids or some basic polymer testing would prove to be valuable.

I ask the above questions because they each represents major directional factors in developing a proper PFD.  The intended use of the water would tell me what levels of removal are required.  For example, in Produced Waters for reinjection, the treated water specs are often