Role of biochar in biodegradation of nonylphenol in sediment: Increasing microbial activity versus decreasing bioavailability.
Role of biochar in biodegradation of nonylphenol in sediment: Increasing microbial activity versus decreasing bioavailability.
复制标题
生物炭在沉积物中壬基酚生物降解中的作用：增加微生物活性与降低生物利用度
DOI：
10.1038/s41598-017-04787-2
复制
发表时间：
2017-07-05
影响因子：
4.6
通讯作者：
Lin Q
中科院分区：
文献类型：
--
作者：
Cheng G;Sun M;Lu J;Ge X;Zhang H;Xu X;Lou L;Lin Q
生物炭对疏水性有机污染物（HOCs）的强烈吸附对沉积物中HOCs的生物利用度和生物可及性具有潜在影响，而生物炭可能会影响沉积物微生物生态。然而，关于生物炭对HOC生物降解的影响以及生物有效性和微生物生态学的综合研究很少。以添加不同比例稻草生物炭（RC）的沉积物为研究对象，研究了生物炭对壬基酚（NP）生物降解的影响。结果表明，RC对NP生物降解的影响因NP浓度不同而异。在低NP浓度下，RC通过降低NP的生物利用度来抑制NP的生物降解，而在高NP浓度下，适度的RC通过降低NP对微生物的毒性来促进NP的生物降解。NP对微生物群落结构的影响显著（P< 0.01），RC对微生物群落结构的影响不显著（P> 0.05）。RC通过改变NP毒性、微生物数量和活性而不是微生物群落结构来影响微生物。研究表明，在不同HOC浓度下，生物炭-沉积物体系中存在一个最佳生物炭含量，该最佳生物炭含量强化了HOC的生物降解过程，加快了生物降解速率，形成吸附-生物降解耦合的生物修复。
The observed strong sorption of hydrophobic organic contaminants (HOCs) to biochar presents potential implications for HOCs bioavailability and bioaccessibility in sediments, while biochar could impact sediment microbial ecology. However, the comprehensive study on the effects of biochar on HOC biodegradation coupled with bioavailability and microbial ecology are rarely documented. In this paper, the effects of biochar on the biodegradation of nonylphenol (NP) were investigated using 3 different NP concentrations (20, 50 and 500 mg/Kg) in sediments amended with different percentage of rice straw biochar (RC). Results showed that the influence of RC on NP biodegradation varied with different NP concentrations. At low NP concentrations, RC suppressed NP biodegradation by reducing NP bioavailability, while at high NP concentrations, moderate RC addition promoted biodegradation by reducing toxicity of NP to microbes. The effects of NP on microbial community structures were significant (P< 0.01), but those of RC were not significant (P> 0.05). The RC affected microorganisms through altering NP toxicity, microbial quantity and activity, but not microbial community structures. This study indicated that there could be an optimal biochar percentage in biochar-sediment systems at different HOC concentrations, which strengthened HOC biodegradation process and accelerated biodegradation rate, forming adsorption-biodegradation coupled bioremediation.