Water treatment, in the coking plant, generally do waste water treatment, mainly phenol water test.
In the coking experiment, the water treatment position should be the most relaxed, relatively harm to the human body is also the smallest, like the coking of benzene, tar experiments are very harmful to the human body position.
The reason why I say so sure, because I myself in the coking plant work, my girlfriend in the unit of the laboratory, is to do water treatment this piece.
However, if you are going to a coking plant, you don't necessarily have to be in the laboratory, if the unit is a state-owned enterprise, the safety and environmental protection department should also be very important, you can consider trying to get into this department.
Environmental health work.
I hope you can help.