Application of Rice-Straw Biochar and Microorganisms in Nonylphenol Remediation: Adsorption-Biodegradation Coupling Relationship and Mechanism.
Application of Rice-Straw Biochar and Microorganisms in Nonylphenol Remediation: Adsorption-Biodegradation Coupling Relationship and Mechanism.
复制标题
稻草生物炭和微生物在壬基酚修复中的应用：吸附-生物降解耦合关系和机制
DOI：
10.1371/journal.pone.0137467
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Hu B
中科院分区：
文献类型：
--
作者：
Lou L;Yao L;Cheng G;Wang L;He Y;Hu B
生物炭吸附为控制环境中疏水性有机物(HOCs)污染提供了一种潜在的修复方法。已经发现，与生物炭结合的HOCs的生物可利用性变得较低，因此有人推测，HOCs在生物炭修饰的土壤/沉积物中将持续更长的半衰期。为了研究生物炭的使用对吸附-生物降解耦合作用的影响，以壬基酚为目标污染物，以稻草生物炭为吸附剂。结果表明，对于一定浓度的壬基酚，在吸附和生物降解的同时，存在一个最佳的生物炭投加量，从而使壬基酚的转化得到优化。当在50 mg/L中加入0.005 g生物炭时，两天内降解率约为47.6%，比未加生物炭时的相对降解量提高了125%，但耐脱附组分仍达87.1%。在生物降解实验过程中，各种吸附形态(f-rap、f-slow、f-r)逐渐减少，生物炭对壬基酚(f-r)的耐解吸分数也能被生物降解。结果表明，适量的生物炭可以促进生物降解，这不仅说明了生物炭的投加量对HOCs的半衰期有很大的影响，而且缓解了人们对生物炭与HOCs结合增强可能导致生物炭修饰环境中二次污染的担忧。
Biochar adsorption presents a potential remediation method for the control of hydrophobic organic compounds (HOCs) pollution in the environment. It has been found that HOCs bound on biochar become less bioavailable, so speculations have been proposed that HOCs will persist for longer half-life periods in biochar-amended soil/sediment. To investigate how biochar application affects coupled adsorption-biodegradation, nonylphenol was selected as the target contaminant, and biochar derived from rice straw was applied as the adsorbent. The results showed that there was an optimal dosage of biochar in the presence of both adsorption and biodegradation for a given nonylphenol concentration, thus allowing the transformation of nonylphenol to be optimized. Approximately 47.6% of the nonylphenol was biodegraded in two days when 0.005 g biochar was added to 50 mg/L of nonylphenol, which was 125% higher than the relative quantity biodegraded without biochar, though the resistant desorption component of nonylphenol reached 87.1%. All adsorptive forms of nonylphenol (f rap, f slow, f r) decreased gradually during the biodegradation experiment, and the resistant desorption fraction of nonylphenol (f r) on biochar could also be biodegraded. It was concluded that an appropriate amount of biochar could stimulate biodegradation, not only illustrating that the dosage of biochar had an enormous influence on the half-life periods of HOCs but also alleviating concerns that enhanced HOCs binding by biochar may cause secondary pollution in biochar-modified environment.