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I work at a sewage treatment plant and I can tell you that no chemicals what so ever are used in our plant. And almost all the bad stuff is broken down in a series of digesters kept at different temps, denitrophication, and ultraviolet light for sterilization. We currently land apply all of our sludge. It is a great soil conditioner (not fertilizer). And we are working on getting a pelitizer and have had many offers from fertilizer companies that want to use it and add their stuff to it. Many fertilizer companies are buying pelitized sludge (must be grade A sludge, there are different ratings and only class A can be put directly on the ground anywhere) and it is completely safe and EPA approved.