Attached a file about “TREATMENT OF PETROLEUM REFINERY WASTEWATER WITH CONSTRUCTED WETLANDS”. I thought this is interesting. I am forwarding you the same document. Its a bit long but I think, you should just read Summary, Chapter 1 and Chapter 2 which will give you a fair idea about it.

I need 3 slides about 2 new technologies in Wastewater treatment technology. you can use additional resources but make sure to cite them.

let me know if you have any more information,