When doing vacuum impregnation, there will be some effluent(waste water).
So, how to do with the waste?
It depends on the local regulations/laws.
In some countries, the regulation is not so strict, then you can dilute the effluent with more water. After that the diluted waste can be lay out to sewer;
Second and advised solution is to add some catalyst in the effluent and mix evenly. And then heat and boil the mixing liquids until it changes to lumps(not hazardous polymer). After that the lumps can be handled like normal solid trash.