The stability of aerobic granular sludge under 4-chloroaniline shock in a sequential air-lift bioreactor (SABR).
The stability of aerobic granular sludge under 4-chloroaniline shock in a sequential air-lift bioreactor (SABR).
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DOI：
10.1016/j.biortech.2013.04.017
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发表时间：
2013-07
影响因子：
11.4
通讯作者：
Liang Zhu;M. Lv;X. Dai;Jia-heng Zhou;Xiang-yang Xu
中科院分区：
文献类型：
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作者：
Liang Zhu;M. Lv;X. Dai;Jia-heng Zhou;Xiang-yang Xu
好氧颗粒污泥技术在处理含有毒难降解污染物的城市污水和工业废水方面具有巨大的潜力。然而，好氧颗粒污泥的形成和结构稳定性容易受到毒性休克的影响。研究了常见有毒污染物4-氯苯胺（4-ClA）对颗粒污泥结构和性能的影响，并揭示了其作用机理，为4-ClA的好氧颗粒污泥工艺降解提供了依据。结果表明，当进水浓度为200 mg L− 1时，4-ClA冲击会导致好氧颗粒污泥解体，污染物去除性能下降。对成熟和解体颗粒污泥胞外聚合物（EPS）的分析表明，EPS中蛋白质含量的降低，尤其是Amide I、β-折叠结构和天冬氨酸等组分的减少，不利于好氧颗粒污泥的稳定性。微生物群落分析结果表明，优势菌如球形芽孢杆菌的消失或优势菌如不动杆菌的出现，可能有助于EPS的减少和好氧颗粒污泥的解体。
The aerobic granular sludge technology has a great potential in treatment of municipal wastewater and industrial wastewater containing toxic non-degradable pollutants. However, the formation and structural stability of aerobic granular sludge is susceptible to toxic shock. In the study, the effect of 4-chloroaniline (4-ClA) as a common toxic pollutant on the granular structure and performance was investigated, and the mechanism was revealed to provide more information on 4-ClA degradation with aerobic granular sludge process. The results showed that a 4-ClA shock at influent 200 mg L−1could cause the disintegration of aerobic granular sludge and decrease of the pollutant removal performance. The analysis of extracellular polymeric substances (EPS) within the mature and disintegrated granular sludge showed that the decrease of protein content in EPS, especially the components like Amide I 3-turn helix and β-sheet structures and aspartate, was not good for the stability of aerobic granular sludge. The microbial community results demonstrated that the disappearance of dominant bacteria likeKineosphaeralimosaor appearance like Acinetobacter, might contribute to the reduction of EPS and disintegration of aerobic granular sludge.