Has enyone heard of bio slug pellets or bio sludge and its effects on livestock

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Has enyone heard of bio slug pellets or bio sludge and its effects on livestock and wildlife? I have searched the internet for info but get vauge info on harmfulness to animals. Do people in the U.S. use these products?
I work in wastewater treatment , yes people use biosolids and this site tells you all you want to know.