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首页> 外文期刊>Chinese science bulletin >Measurement of the free concentrations of alkyl phenols and bisphenol A to determine their biodegradation kinetics by activated sludge
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Measurement of the free concentrations of alkyl phenols and bisphenol A to determine their biodegradation kinetics by activated sludge

机译：测量烷基酚和双酚A的自由浓度，以确定活性污泥的生物降解动力学

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摘要

A negligible depletion-solid phase microextraction (nd-SPME) method is developed to measure free concentrations of two alkyl phenols (4-t-octylphenol, nonylphenol) and bisphenol A in activated sludge, with which aerobic biodegradation kinetics of three pollutants was determined. For the degradation of octylphenol, nonylphenol and bisphenol A, the apparent rate constant based on total concentration is 0.02, 0.01 and 0.03 h~(-1), respectively; with the half life being 34.9, 54.3 and 22.3 h correspondingly. Meanwhile, real rate constants based on free concentration are 0.74, 0.60 and 1.03 h~(-1), respectively; with the half life being 0.9,1.2 and 0.7 h accordingly. Differences between two constants revealed that desorption of targeted pollutants from activated sludge should be the rate-limiting step. Compared to the rapid biodegradation of alkyl phenols and bisphenol A in free state, the desorption of pollutants from the sludge is relatively slow, which made the apparent biodegradation rate constants much lower.
机译：建立了一种可忽略的消耗固相微萃取（nd-SPME）方法来测量活性污泥中两种烷基酚（4-叔辛基酚，壬基酚）和双酚A的自由浓度，从而测定了三种污染物的好氧生物降解动力学。对于辛基苯酚，壬基苯酚和双酚A的降解，基于总浓度的表观速率常数分别为0.02、0.01和0.03 h〜（-1）。半衰期分别为34.9、54.3和22.3小时。同时，基于自由浓度的实际速率常数分别为0.74、0.60和1.03 h〜（-1）；半衰期分别为0.9、1.2和0.7小时。两个常数之间的差异表明，从目标活性污泥中解吸目标污染物应该是限速步骤。与游离态的烷基酚和双酚A的快速生物降解相比，污泥中污染物的解吸相对较慢，这使得表观生物降解速率常数大大降低。

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