Adsorption and degradation in the removal of nonyiphenol from water by cells immobilized on biochar
Adsorption and degradation in the removal of nonyiphenol from water by cells immobilized on biochar
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生物炭固定化细胞吸附降解去除水中壬基酚
DOI：
10.1016/j.chemosphere.2019.04.151
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发表时间：
2019-08-01
期刊：
影响因子：
8.8
通讯作者：
Lin, Qi
中科院分区：
文献类型：
--
作者：
Lou, Liping;Huang, Qian;Lin, Qi
为探讨生物炭吸附和细菌降解在生物炭固定化微生物废水处理系统中的作用，研究了竹炭（BC）和木炭（WC）固定化细菌对水中壬基酚（NP）的短期和长期去除（吸附+降解）速率和降解速率。结果表明，不同生物炭固定化细胞对NP的去除效果不同，竹炭固定化细胞（I-BC）的去除效果较好。经过8轮长期重复使用，I-BC对NP的累积去除率和降解率分别为93.95%和41.86%，显著高于木炭固定化细胞（69.60%，22.78%）和游离细胞（64.79%，19.49%）（P < 0.01）。降解率与去除率之比的上升表明NP的长期去除效果更依赖于生物降解。I-BC中NP残留量仍占50%左右，表明载体处置过程中的二次污染不容忽视。此外，通过扫描电镜、定量PCR和16 S rRNA等方法观察了生物炭对微生物的促进作用。假单胞菌属、无色杆菌属、苍白杆菌属和寡养单胞菌属是NP降解的优势菌。添加生物质炭（尤其是竹炭）也有效地延缓了群落结构的转变。(C)2019爱思唯尔有限公司版权所有。
To investigate the role of adsorption by biochar and biodegradation by bacteria in the wastewater treatment system of microorganisms immobilized on biochar, Nonylphenol (NP) removal (adsorption + degradation) rates and degradation rates from water by NP degrading bacteria immobilized on bamboo charcoal (BC) and wood charcoal (WC) were examined in a short-term and long-term. Results showed that cells immobilized on different biochar had different NP removal effects, and cells immobilized on bamboo charcoal (I-BC) was better. After eight rounds of long-term reuse, the cumulative removal rate and the degradation rate of NP in water by I-BC were 93.95% and 41.86%, respectively, significantly higher than those of cells immobilized on wood charcoal (69.60%, 22.78%) and free cells (64.79%, 19.49%) (P < 0.01). The rise in the ratio of the degradation rate to the removal rate indicated that the long-term NP removal effect is more dependent on biodegradation. The amount of residual NP in I-BC still accounted for about 50%, indicating that the secondary pollution in the disposal of carrier could not be ignored. In addition, promotion effect of biochar on microorganisms were observed by SEM, quantitative PCR and 16S rRNA. Pseudomonas, Achromobacter, Ochrobactrum and Stenotrophomonas were predominant bacteria for NP degradation. The addition of biochar (especially bamboo charcoal) also effectively delayed the transformation of their community structure. (C) 2019 Elsevier Ltd. All rights reserved.