The defense for the mill which turns old growth into woodchips, and the Primary concern is supposed to be the jobs of a few hundred workers. Disperse Dioxin ? Share the misery. It never goes goes away, and known as a Persistent Organic Pollutant. It can not be broken down by any natural process. It is alien to the Environment. With dispersal, The first problem is they have absolutely no idea how the current is working, so they intend to throw it in and hope it goes away. Remember Homer in the Simpsons movie ? This is the same thing but it isn't a movie, but it is still for the sake of free donuts. There is a lot of chemical production, and use of organic pesticides like DDT, which release dioxin and thousands of other toxic substances which are just flushed down the river to 'disperse' India is an example, but it is a consequence of global industrialization, and solutions that are short term but create long term effects. Any Ocean is tests for toxins have been surprising and ominous.

About 40 years ago I flew into Burnie (nth coast of Tasmania and asked about an area of brown water on the coast. (It was at least a square mile.) I was told it was waste from the mill.
Not surprisingly my relatives warned me not to fish there.

I don't know why your all so worried about it, that's
only twenty three million three hundred and sixty tons
a year of really nasty stuff, might take as long as a
couple of years to pretty much destroy the place.

In that time, lot's of proffits will be made!