For COD, COD was higher than the control group ( p < 0.01), and showed a trend of increasing first and then decreasing.
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Construction of Magnetic Composite Bacterial Carrier and Application in 17<i>β</i>-Estradiol Degradation.
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The sentences
For total phosphorus (P), it was higher than the control group; but showed a decreasing trend, which may be due to P as a nutrient for bacteria.