【目的】结合中温与高温消化两者优势的两相厌氧消化工艺可能是推进污泥厌氧消化发展的重要方向,因此,探究和比较中温和高温污泥厌氧消化系统中微生物群落组成的异同具有重要意义。【方法】利用高通量测序技术检测中温和高温厌氧消化系统中细菌与古菌的16S r RNA基因序列信息和真菌的内转录间隔(ITS)序列信息,利用基因芯片(Geo Chip 5.0)检测病毒和病原菌致病基因的信息,以对比中温和高温条件下微生物群落在物种组成和功能基因层面上的异同。【结果】中温和高温条件下细菌和古菌在群落物种组成上存在显著差异,病毒和病原菌毒性基因也显著不同,而两种系统中真菌群落的物种组成相似且丰度相对较低。中温条件下产甲烷古菌和未分类微生物相对丰度较高,而高温条件下产酸及嗜热菌相对丰度较高,且高温消化后病毒和病原菌毒性基因相对丰度下降。微生物群落结构与COD、TS和VS有着显著相关性。【结论】微生物群落组成和功能基因在中高温的污泥厌氧消化系统中显著不同,从而解释了两个系统功能的差异。微生物群落的形成与进水参数相关,说明微生物对进水条件敏感。
Formaldehyde（HCHO）is carcinogenic and teratogenic,and is therefore a serious danger to human *** also adversely affects air *** oxidation is an efficient technique for removing *** development of highly efficient an...
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Formaldehyde（HCHO）is carcinogenic and teratogenic,and is therefore a serious danger to human *** also adversely affects air *** oxidation is an efficient technique for removing *** development of highly efficient and stable catalysts that can completely convert HCHO at low temperatures,even room temperature,is *** Pt and Pd catalysts can completely convert HCHO at room temperature,but their industrial applications are limited because they are *** catalytic activities in HCHO oxidation of transition-metal oxide catalysts such as manganese and cobalt oxides with unusual morphologies are better than those of traditional MnO2,Co3O4,or other metal *** is attributed to their specific structures,high specific surface areas,and other factors such as active phase,reducibility,and amount of surface active *** catalysts with various morphologies have great potential and can also be used as catalyst *** loading of relatively cheap Ag or Au on transition-metal oxides with special morphologies potentially improves the catalytic activity in HCHO removal at room *** preparation and development of new nanocatalysts with various morphologies and structures is important for HCHO *** this paper,research progress on precious-metal and transition-metal oxide catalyst systems for HCHO oxidation is reviewed; topics such as oxidation properties,structure–activity relationships,and factors influencing the catalytic activity and reaction mechanism are *** prospects and directions for the development of such catalysts are also covered.
Three-dimensional（3D）ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard *** material was used for catalytic oxidation of *** material has high surface areas and the mesoporous cha...
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Three-dimensional（3D）ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard *** material was used for catalytic oxidation of *** material has high surface areas and the mesoporous characteristics of the template,with cubic symmetry（ia3d）.It consists of a β-MnO2 crystalline phase corresponding to pyrolusite,with a rutile *** electron microscopy and X-ray photoelectron spectroscopy showed that the 3D-MnO2 catalyst has a large number of exposed Mn4＋ ions on the（110）crystal plane surfaces,with a lattice spacing of 0.311 nm; this enhances oxidation of *** conversion of HCHO to CO2 and H2O was achieved at 130 °C on 3D-MnO2; the same conversions on α-MnO2 and β-MnO2 nanorods were obtained at 140 and 180 °C,respectively,under the same *** specific mesoporous structure,high specific surface area,and large number of surface Mn4＋ ions are responsible for the catalytic activity of 3D-MnO2 in HCHO oxidation.
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