PVC biodeterioration and DEHP leaching by DEHP-degrading bacteria.
PVC biodeterioration and DEHP leaching by DEHP-degrading bacteria.
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DOI：
10.1016/j.ibiod.2011.12.011
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发表时间：
2012-04-01
影响因子：
4.8
通讯作者：
Montalvo-Rodriguez, Rafael
中科院分区：
文献类型：
--
作者：
Latorre, Isomar;Hwang, Sangchul;Sevillano, Maria;Montalvo-Rodriguez, Rafael
增加了新分离的、先前未报告的邻苯二甲酸二（2-乙基己基）酯（DEHP）降解剂，以评估其在聚氯乙烯（PVC）浴帘劣化和DEHP沥滤中的作用。在具有革兰氏阳性菌株LHM 1和LHM 2的生物增强的浴帘的表面上形成的生物膜比生物刺激的和革兰氏阴性菌株LHM 3增强的浴帘的生物膜厚。在~287°C下观察到含有革兰氏阳性细菌的生物增强浴帘的一阶导数热重（DTG）峰，而在~283°C下检测到对照和革兰氏阴性菌株LHM 3增强浴帘。第一DTG峰值温度的这种轻微延迟表明用革兰氏阳性细菌生物增强的浴帘中的增塑剂浓度较低。尽管使用DEHP降解剂进行了生物强化，但生物强化反应器的水溶液并非不含DEHP，这可能是由于存在必须支持微生物生长的共溶质。一般来说，在生物降解实验的前半部分（<3周），使用革兰氏阳性菌株LHM 1和LHM 2的生物强化反应器的DEHP水溶液浓度高于生物刺激和菌株LHM 3强化反应器。因此，菌株LHM 1和LHM 2可能在DEHP向环境的淋溶和PVC的生物降解中起重要作用。
Newly isolated, not previously reported, di-(2-ethylhexyl) phthalate (DEHP)-degraders were augmented to assess their role in polyvinyl chloride (PVC) shower curtain deterioration and DEHP leaching. The biofilms that developed on the surfaces of the bioaugmented shower curtains with Gram-positive strains LHM1 and LHM2 were thicker than those of the biostimulated and Gram-negative strain LHM3-augmented shower curtains. The first derivative thermogravimetric (DTG) peaks of the bioaugmented shower curtains with the Gram-positive bacteria were observed at ~287°C, whereas the control and Gram-negative strain LHM3-augmented shower curtains were detected at ~283°C. This slight delay in the first DTG peak temperature is indicative of lower plasticizer concentrations in the shower curtains that were bioaugmented with Gram positive bacteria. Despite bioaugmentation with DEHP-degraders, aqueous solutions of the bioaugmentation reactors were not DEHP-free due probably to the presence of co-solutes that must have supported microbial growth. Generally, the bioaugmented reactors with the Gram-positive strains LHM1 and LHM2 had greater aqueous DEHP concentrations in the first-half (<3 wk) of the biodeterioration experiment than the biostimulated and strain LHM3-augmented reactors. Therefore, strains LHM1 and LHM2 may play an important role in DEHP leaching to the environment and PVC biodeterioration.
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