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Effects of tetracycline on simultaneous biological wastewater nitrogen and phosphorus removal

机译：四环素对同时去除生物废水中氮和磷的影响

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摘要

The impact of tetracycline on simultaneous biological wastewater nitrogen and phosphorus removal and its fundamental mechanisms were investigated in this study. Compared with the control, a lower concentration of tetracycline (0.2 mg L-1) did not exert adverse effects on biological nutrient removal; however, the presence of 2 and 5 mg L-1 of tetracycline decreased the total nitrogen removal efficiency from 80.2% to 69.2% and 65.1% respectively, but they showed marginal influence on phosphorus removal. The mechanism studies showed that most of the influent tetracycline was adsorbed by sludge, which induced the release of extracellular polymeric substances (EPS) from a sludge matrix, decreased the protective role of EPS on bacterial cells, declined the viability of sludge, increased the sludge volume index, and caused the detachment of denitrifying bacteria from sludge. Thus, the denitrifiers were more easily contacted with tetracycline. Further investigation revealed that it was the denitrifiers instead of nitrifiers being negatively affected by tetracycline, and the generation of electron donor for denitrification via intracellular polyhydroxyalkanoates (PHA) decomposition was depressed. In addition, tetracycline inhibited the activities of nitrate reductase and nitrite reductase as it was a strong chelating agent which reduced the free copper ions.
机译：研究了四环素对同时去除生物废水中氮和磷的影响及其基本机理。与对照组相比，较低浓度的四环素（0.2 mg L-1）不会对生物营养去除产生不利影响。然而，2和5 mg L-1的四环素的存在将总氮去除效率分别从80.2％降低到69.2％和65.1％，但它们对磷去除率的影响很小。机理研究表明，大多数进水四环素被污泥吸附，从而导致污泥基质中释放出胞外聚合物（EPS），降低了EPS对细菌细胞的保护作用，降低了污泥的活力，增加了污泥的量。体积指数，并导致反硝化细菌从污泥中脱离。因此，反硝化剂更容易与四环素接触。进一步的研究表明，四环素对硝化器的作用是反硝化作用，而不是硝化作用，并且抑制了通过细胞内多羟基链烷酸酯（PHA）分解反硝化作用的电子供体的产生。此外，四环素是一种强大的螯合剂，可还原游离铜离子，因此可抑制硝酸还原酶和亚硝酸还原酶的活性。

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