零价铁与厌氧微生物协同还原地下水中的硝基苯  

Reduction of nitrobenzene in ground water by the combination of zero valent iron and anaerobic microorganism

作　　者：梁俊倩[1] 吴锦华[1] 李平[1] 王向德[1] 杨波[2] 

机构地区：[1]华南理工大学环境科学与工程学院,污染控制与生态修复广东省普通高等学校重点实验室,工业聚集区污染控制与生态修复教育部重点实验室,广州510006 [2]深圳大学化学与化工学院,深圳518060

出　　处：《环境工程学报》2012年第8期2512-2516,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50708039);国家高技术研究发展计划(863)项目(2009AA063902);中央高校基本科研业务费资助项目(2009zm0202);教育部新教师基金(20070561011);广东省自然科学基金资助项目(05300188)

摘　　要：通过间歇式实验,考察了零价铁与厌氧微生物协同还原地下水中硝基苯的效果。实验结果表明,由零价铁腐蚀为厌氧微生物提供H2电子供体还原硝基苯的效果明显优于零价铁和微生物单独作用,硝基苯去除率分别提高21.8%和57.0%。弱酸性条件有利于协同反应进行,当初始pH为5.0和6.0时,4 d后硝基苯去除率比初始pH为7.0时的提高74.4%和35.2%。增加零价铁投加量可提高协同还原的效果,零价铁最佳投加量为250 mg/L。零价铁腐蚀产生的Fe2+无法作为电子供体被微生物利用,但可作为无机营养元素促进协同过程。由于零价铁产H2速率受表面覆盖物影响不明显,在地下水修复过程中可保证协同效果并延长零价铁的使用寿命。Batch tests were conducted to investigate the reduction of nitrobenzene （NB） in groundwater by the combination of zero valent iron （ZVI） and anaerobic microorganism. The results showed that the ZVI/anae- robic microorganism system was better than ZVI or anaerobic microorganism alone, and the removal of NB in- creased by 21.8% and 57.0% , respectively. Acid condition was favorable for NB reduction in the synergy sys- tem. When solution pH decreased from 7.0 to 6.0 and 5.0, NB removal increased by 74.4% and 35.2% after 4 d, respectively. NB removal increased with iron dosage and the optimal iron dosage was 250 mg/L. The re- leased Fe2~ during ZVI corrosion could not be used as an electron donor, but it was beneficial to anaerobic mi- croorganism as an inorganic nutrient element. Since the production of H2 was not significantly affected by the pre- cipitates on iron surface, NB removal efficiency could be maintained and the life span of ZVI could also be pro- longed in contaminated groundwater remediation.

关 键 词：地下水 零价铁 硝基苯 协同还原 

分 类 号：X523[环境科学与工程—环境工程]