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Fig. 5. Concentrations of nonylphenol (NP) in biosolids and composts from 13 wastewater treatment plants (WWTPs) in Georgia, South Carolina, and Kansas. The numbers indicate the WWTPs listed in the table below the graph. b, Biosolids; c, compost; c-3mo, biosolids composted for 3 months; c-12mo, biosolids composted for 12 months; nd, not detectable (Xia and Pillar, 2003).