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1. Metagenomic analysis and comparison of microbial community structure of aerobic activated sludge and anaerobic digestion sludge | |||
GUO Jianhua,PENG Yongzhen | |||
Environmental Science and Techology 21 May 2016 | |||
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Abstract:Aerobic activated sludge and anaerobic digestion sludge contain highly complex microbial communities, which play a crucial role in both wastewater treatment and sludge management. Although the responsible microbes have been intensively studied, in communities of high complexity, conventional approaches based on 16S rRNA cannot completely reveal the whole microbial community structure. The metagenomic sequencing was applied to characterize and compare microbial community structure of aerobic activated sludge and anaerobic digestion sludge from a full-scale municipal wastewater treatment plant. Over 3.0 gigabases of metagenomic sequence data were generated with the Illumina HiSeq 2000 platform for each sample. Taxonomic analysis by MG-RAST sever indicated bacteria were dominant in both samples, while archaea with a higher abundance were detected in the anaerobic digestion sludge. The aerobic activated sludge was dominated by Proteobacteria, Bacteroidetes, Nitrospirae, and Actinobacteria, while the most abundant bacterial populations were Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria in anaerobic digestion sludge. Key microorganisms and nitrogen metabolism in aerobic activated sludge and key microorganisms and pathways involved in methanogenesis were further revealed. Ammonia-oxidizing bacteria (AOB) distinctly dominate over ammonia-oxidizing archaea (AOA) in activated sludge. Denitrification, rather than anammox, is the major pathway to complete nitrogen removal. Meanwhile, the dominant proliferation of Methanosaeta and Methanosarcina, together with the functional affiliation of enzymes-encoding genes (Ack, PTA and ACSS) suggested an acetoclastic methanogenesis is the dominant methanogenesis pathway in anaerobic digester. | |||
TO cite this article:GUO Jianhua,PENG Yongzhen. Metagenomic analysis and comparison of microbial community structure of aerobic activated sludge and anaerobic digestion sludge[OL].[21 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4693657 |
2. Effect of sample size of PTFE needle felt on its strength measurement | |||
MAO Ning,SUN Xi | |||
Environmental Science and Techology 18 December 2012 | |||
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Abstract:Strength and elongation are two important parameters for evaluating the durability property of needle felt which is now widely used for the air pollution control. It is necessary to measure them as reasonable as possible. The paper researches on the effect of sample size on the strength measurement of needle felt. The sample size is set as 2cm, 3cm, 4cm and 5cm for width and 10cm, 20m and 30cm for length respectively and the strength measurements are completed. It can be concluded that the width of 5cm and length of 20cm are suitable values for the strength measurement of needle felt for which gives the smallest deviation for both machine direction and transverse direction of needle felt. And the sample length has a bigger effect on strength measurement of needle felt than sample width. | |||
TO cite this article:MAO Ning,SUN Xi. Effect of sample size of PTFE needle felt on its strength measurement[OL].[18 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4503723 |
3. Experimental investigation on styrene emission with a 1000m3/h plasma system | |||
Zhang xuming,Yan Keping | |||
Environmental Science and Techology 20 January 2011 | |||
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Abstract:IThis paper reports experimental investigations on plasma-induced styrene emission abatement in air at room temperature (24±2 ℃) and pressure. Tests were performed with a 1000 m3/h plasma system under DC corona discharge. It is observed that styrene destruction in DC glow discharge is negligible in contrast to streamer corona. When relative humidity (RH) is in the range of 30 %-80 %, the energy consumption for styrene decomposition rises with RH value. The energy coefficient β value becomes larger with increasing either RH or the initial styrene concentration for RH in 30 %-80 % and the concentrations within 90-1000 ppm, respectively. With regards to those dependence sensitivity, the lower the concentration, the more sensitive to the RH value. Under optimal condition (100 ppm initial concentration, 35 %RH), the β value is 18.73 J/L. | |||
TO cite this article:Zhang xuming,Yan Keping. Experimental investigation on styrene emission with a 1000m3/h plasma system[OL].[20 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4407647 |
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