布洛芬对活性污泥中功能酶活性的影响
Effect of Ibuprofen on Functional Enzymes of Activated Sludge
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摘要: 布洛芬是常用非甾体抗炎药,使用量大、去除率低,且药品的存在会诱发水生生物发生不同应激变化。研究对比了在不同浓度梯度布洛芬暴露下活性污泥中脲酶、转化酶活性的动态变化率、总变化率的不同响应。结果表明,在布洛芬浓度为35~40 μg·L-1时,对脲酶活性的抑制程度超过了40%,布洛芬浓度达28 μg·L-1后,脲酶活性总变化率单调增加,在布洛芬浓度达到40 μg·L-1时,脲酶活性总变化率超过了70%。而转化酶活性动态变化率低于±20%,总变化率低于±30%。上述研究结果表明,脲酶活性在布洛芬较低浓度暴露下变化幅度大、响应快。因此推荐使用较为敏感的脲酶活性生物指标,评价布洛芬等新型有机污染物对复杂污泥机制中活性污泥微生物活性影响。相关实验数据可以对污水处理系统的潜在风险进行早期预警。Abstract: Ibuprofen used as a common non-steroidal anti-inflammatory pharmaceutical could induce different stress effect on aquatic organisms with a higher level of consumption and a lower degree of removal efficiency. The differences between the changes of urease activity and invertase activity under the exposure of ibuprofen were studied. The results showed that the inhibition of urease activity exceeded 40% under the exposure concentration range of ibuprofen (35-40 μg·L-1), and the overall change rate of urease activity monotonically increased beyond 28 μg·L-1. The overall change rate of urease activity exceeded 70% when the concentration of ibuprofen reached 40 μg·L-1. While the dynamic change rates of invertase activity were less than ±20%, its overall change rates were less than ±30%. Ccompared with activity of invertase, urease activity had a wide range of changes and a rapid response under the lower-concentration exposure of ibuprofen. Therefore urease activity could be recommended as a sensitive biological indicator to evaluate the impact of ibuprofen on the microbial activity of activated sludge. The related data may provide early warning of the potential risks in wastewater treatment systems.
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Key words:
- ibuprofen /
- activated sludge /
- urease activity /
- invertase activity /
- sensitive indicator
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