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Action effects of tetracycline and copper ion on the microorganisms during biological phosphorus removal |
ZHANG Hua, JIANG Wei, LIU Ya-li, WANG Jin-hua, HUANG Jian, TAO Hai-tao, CAO Xue-feng, FANG Nan |
School of Environment and Energy Engineering, Anhui Jianzhu University, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Hefei 230601, China |
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Abstract This paper focused on the specific phosphorus absorption rate to characterize the combined effect of tetracycline and copper ion binary mixtures on the biological phosphorus removal by microorganisms. Three mixtures with different concentration ratios (ratio 1, ratio 2, ratio 3) were designed by the linear average ray method. The relationship curves between the concentration and the action effect were obtained by fitting the experimental data with logistic equations. The combined effects of mixtures on the phosphorus removal microorganisms were analyzed by the concentration addition model. The results showed that the inhibition effect of mixtures on phosphorus removal microorganisms increased gradually with time. The concentration addition model revealed that the combined effect of mixtures with different ratios on the microorganisms gradually changed from antagonistic effect to additive effect and synergistic effect as the treatment time increased. However, there were obvious differences in the composition of these effects. In ratio1and ratio3, there were significant differences in the proportions of each effect, and the antagonistic effect was obvious. However, the antagonistic effect was relatively weak in ratio2 where each effect had similar proportions.
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Received: 19 September 2020
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