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Substantially enhanced anaerobic reduction of nitrobenzene by biochar stabilized sulfide-modified nanoscale zero-valent iron: Process and mechanisms.
Environment International ( IF 10.3 ) Pub Date : 2019-07-18 , DOI: 10.1016/j.envint.2019.105020 Dejin Zhang 1 , Jinyou Shen 1 , Hefei Shi 1 , Guanyong Su 1 , Xinbai Jiang 1 , Jiansheng Li 1 , Xiaodong Liu 1 , Yang Mu 2 , Lianjun Wang 1
Environment International ( IF 10.3 ) Pub Date : 2019-07-18 , DOI: 10.1016/j.envint.2019.105020 Dejin Zhang 1 , Jinyou Shen 1 , Hefei Shi 1 , Guanyong Su 1 , Xinbai Jiang 1 , Jiansheng Li 1 , Xiaodong Liu 1 , Yang Mu 2 , Lianjun Wang 1
Affiliation
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Nanoscale zero-valent iron (nZVI), although being increasingly used in anaerobic systems for strengthening the removal of various refractory pollutants, is limited by various inherent drawbacks, such as easy precipitation, passivation, poor mass and electron transfer. To address the above issues, biochar stabilized sulfide-modified nZVI (S-nZVI@BC) was added into an up-flow anaerobic sludge blanket (UASB) to investigate the enhancement of anaerobic biodegradation of nitrobenzene (NB) and its impacts on microbial community structure. The results demonstrated that both NB reduction and aniline formation could be substantially facilitated in S-nZVI@BC coupled system compared to other anaerobic ones coupled with nZVI or S-nZVI. The dosage of S-nZVI@BC resulted in the formation of densely packed aggregates, evidently increased the extracellular polymeric substances content, promoted the volatile fatty acids transformation and stimulated the methane yield. Furthermore, species related to fermentation (Bacteroides and Longilinea), methanogenesis (Methanosarcina and Methanomethylovorans), electroactivity (Pelobacter, Thiobacillus and Phaselicystis) as well as reduction (Desulfovibrio) were considerably enriched in S-nZVI@BC coupled system. The activities of electron transport, total adenosine triphosphate, nitroreductase and NAD(P)H, which were closely related to microbial activity and NB transformation, were increased noticeably in S-nZVI@BC coupled anaerobic system. This study demonstrated the promising potential for long-term operation and full-scale application of S-nZVI@BC coupled system for the treatment of NB containing wastewater.
中文翻译：
生物炭稳定的硫化物改性的纳米级零价铁显着提高了硝基苯的厌氧还原：过程和机理。
纳米级零价铁（nZVI）虽然越来越多地用于厌氧系统中，以加强各种难处理污染物的去除，但受到各种固有缺陷的限制，例如易沉淀，钝化，质量差和电子转移。为了解决上述问题，将生物炭稳定的硫化物改性的nZVI（S-nZVI @ BC）添加到上流厌氧污泥层（UASB）中，以研究硝基苯（NB）厌氧生物降解的增强作用及其对微生物群落的影响结构体。结果表明，与其他与nZVI或S-nZVI偶联的厌氧菌相比，在S-nZVI @ BC偶联系统中可大大促进NB的还原和苯胺的形成。S-nZVI @ BC的剂量导致形成密集堆积的聚集体，明显增加了细胞外聚合物的含量，促进了挥发性脂肪酸的转化并提高了甲烷的产率。此外，在S-nZVI @ BC偶联体系中，与发酵相关的物种（拟杆菌和Longilinea），产甲烷作用（甲烷八叠球菌和甲基甲基甲硫醇），电活性（细菌杆菌，硫杆菌和噬菌体）以及还原酶（脱硫弧菌）的种类大大丰富。与微生物活性和NB转化密切相关的电子传递，总三磷酸腺苷，硝基还原酶和NAD（P）H的活性在S-nZVI @ BC耦合厌氧系统中显着增加。这项研究证明了S-nZVI @ BC耦合系统在处理含NB废水中的长期运行和大规模应用前景广阔。
更新日期：2019-07-18
中文翻译：
生物炭稳定的硫化物改性的纳米级零价铁显着提高了硝基苯的厌氧还原：过程和机理。
纳米级零价铁（nZVI）虽然越来越多地用于厌氧系统中，以加强各种难处理污染物的去除，但受到各种固有缺陷的限制，例如易沉淀，钝化，质量差和电子转移。为了解决上述问题，将生物炭稳定的硫化物改性的nZVI（S-nZVI @ BC）添加到上流厌氧污泥层（UASB）中，以研究硝基苯（NB）厌氧生物降解的增强作用及其对微生物群落的影响结构体。结果表明，与其他与nZVI或S-nZVI偶联的厌氧菌相比，在S-nZVI @ BC偶联系统中可大大促进NB的还原和苯胺的形成。S-nZVI @ BC的剂量导致形成密集堆积的聚集体，明显增加了细胞外聚合物的含量，促进了挥发性脂肪酸的转化并提高了甲烷的产率。此外，在S-nZVI @ BC偶联体系中，与发酵相关的物种（拟杆菌和Longilinea），产甲烷作用（甲烷八叠球菌和甲基甲基甲硫醇），电活性（细菌杆菌，硫杆菌和噬菌体）以及还原酶（脱硫弧菌）的种类大大丰富。与微生物活性和NB转化密切相关的电子传递，总三磷酸腺苷，硝基还原酶和NAD（P）H的活性在S-nZVI @ BC耦合厌氧系统中显着增加。这项研究证明了S-nZVI @ BC耦合系统在处理含NB废水中的长期运行和大规模应用前景广阔。
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