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Worms bear sludge load.

The findings illustrate the wide array of PPCPs that can be carried from treatment facility to field. Biosolids provide "great value as sources of organic carbon and nutrient compounds," says coauthor Edward Furlong of the U.S. Geological Survey (USGS), but "you still have to understand the trace constituents." The proof-of-concept study also demonstrates that worms are taking up some of the compounds into their tissues and bioconcentrating them there, with unknown effects, says study coauthor Dana Kolpin, also of USGS.