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首页> 外文期刊>Environmental engineering and management journal >BIODEGRADATION AND SORPTION OF 17α-ETHINYLESTRADIOL IN SUBMERGED MEMBRANE BIOREACTOR: EFFECT OF INITIAL AMMONIUM CONCENTRATION
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BIODEGRADATION AND SORPTION OF 17α-ETHINYLESTRADIOL IN SUBMERGED MEMBRANE BIOREACTOR: EFFECT OF INITIAL AMMONIUM CONCENTRATION

机译：淹没膜生物反应器中17α-乙二烯雌二醇的生物降解和吸附：初始铵浓度的影响

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摘要

Batch experiments were done to assess the removal of 17α-Ethinylestradiol (EE2) using sludge acclimated from a lab-scale submerged membrane bioreactor (SMBR). Though activated sludge (AS) was found to effectively remove EE2 from wastewater, membrane bioreactor showed a faster rate of removal. Results obtained revealed that EE2 was removed completely within 18 h in SMBR while it took 96 h in AS. The removal of EE2 fits first-order rate reactions with a kinetic rate constant, k, of 0.96 d~(-1) and 6.96 d~(-1) for AS and SMBR, respectively. This showed that EE2 rate of removal using SMBR sludge is 7X faster than using AS. The role of nitrification in enhancing the removal of EE2 was investigated in terms of the effect of different initial ammonium concentration on both sorption and biodegradation. As the initial ammonium concentration is increased, biodegradation of EE2 is enhanced whereas sorption of EE2 onto the SMBR biomass is decreased. Sorption studies revealed that competition for sorption sites happened between ammonium ions and EE2. The partitioning coefficients, K_D were 0.31 L (g_(MLSS))~(-1) and 0.09 L (g_(MLSS)~(-1) for SMBR and AS, respectively. These results showed that EE2 adsorbed more to SMBR sludge than to AS. Results of this study suggest that MBR improves the biological removal of EE2.
机译：使用实验室规模的浸没膜生物反应器（SMBR）驯化的污泥进行了批处理实验，以评估17α-乙炔雌二醇（EE2）的去除。尽管发现活性污泥（AS）可有效去除废水中的EE2，但膜生物反应器的去除速度更快。获得的结果表明，EE2在SMBR中在18小时内被完全去除，而在AS中则花费了96小时。 EE2的去除适合一级速率反应，AS和SMBR的动力学速率常数k分别为0.96 d〜（-1）和6.96 d〜（-1）。这表明使用SMBR污泥的EE2去除速率比使用AS快7倍。根据不同的初始铵浓度对吸附和生物降解的影响，研究了硝化在增强EE2去除中的作用。随着初始铵浓度的增加，EE2的生物降解增强，而EE2在SMBR生物质上的吸附减少。吸附研究表明，铵离子和EE2之间发生了吸附位的竞争。对于SMBR和AS，分配系数K_D分别为0.31 L（g_（MLSS））〜（-1）和0.09 L（g_（MLSS）〜（-1）。这些结果表明，EE2对SMBR污泥的吸附比这项研究的结果表明，MBR改善了EE2的生物去除。

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