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Limited information about the sludge quality is a major constraint for its usage and proper disposal. This study investigated the occurrence of 49 elements in sludge from 11 wastewater treatment plants (WWTPs) in Chongqing and Xiamen cities of China. The concentration of 46-detected elements ranged from 16.2 μg kg−1 (Pt) to 55.0 g kg−1 (Al) on dry solid basis in the sludge. The enrichment factor of...
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