Eyup. Something Lumpy seems to have a hard time wrapping his head around.
Yes, he thinks he is so much smarter than everyone else, but he doesn't grasp so many things.
Tell your average municipal water treatment plant that they can sell some of the stuff they pull out of the sewage for $1,000 /ton, and see if that doesn't yield you a good amount of potassium.
There are too many products in the sewer systems that would make it impractical for them to use the waste. Too costly to separate the harmful chemicals and elements, unless we wish to increase the pollution standards of what we put in the soil.
Get the price high enough, and all sorts of alternatives and new sources become economical. Capital + Humans = cool stuff.
Welcome to Utopia, right?