Hi Lizette,
I have heard of treatment with ozone or electrolytic oxidation, but I have not heard much about bioremediation using specific plants or microbes.
You could try searching google.com for "treatment of antibiotic wastewater" and follow links from there. There is also a forum devoted entirely to waste water treatment:
http://www.waterandwastewater.com/
You could post your question there. If you do, make sure to tell them your background and why you are interested in this topic.
Chris