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Pulse cleaning flow models and numerical computation of candle ceramic filters

Journal of Environmental Sciences 2002年第2期14卷 210-215页

作者： Tian, Gui-shan Ma, Zhen-ji Zhang, Xin-yi Xu, Ting-xiang dept. of Resource and envrn. Eng. Zibo University Zibo 255091 China

Analytical and numerical computed models are developed for reverse pulse cleaning system of candle ceramic filters. A standard turbulent model is demonstrated suitably to the designing computation of reverse pulse cleaning system from the experimental and one dimensional computational result. The computed results can be used to guide the designing of reverse pulse cleaning system, which is optimum Venturi geometry. From the computed results, the general conclusions and the designing methods are obtained.

关键词： candle ceramic filters reverse pulse cleaning face velocity numerical computed models pressure difference

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Phosphorus export by runoff from agricultural field plots with different crop cover in Lake Taihu watershed

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Journal of Environmental Sciences 2001年第4期13卷 502-507页

作者： Yan, W.-j. Huang, M.-x. Zhang, S. Tang, Y.-j. dept. of envrn. biogeochemistry Inst.Geographic Sci./Nat. Rsrc. Res. Chinese Academy of Sciences Beijing 100101 China

Runoff and soil losses from agricultural fields are investigated as major nonpoint sources of phosphorus (P) entering lakes of Eastern China. There is relatively little information on P transport from ricefield and cropland of Lake Taihu watershed in Eastern China. Soil and P in surface runoff from a series of plots in the watershed were evaluated under simulated rainfall conditions. The objectives of this study were to evaluate the effects of crop cover, slope, and fertilizer application on P concentrations in surface runoff and eroded soil. Accumulated sediment yields varied from 7.1 to 300 g/m2 for croplands, depending on management practices. For all experiment plots, weighted average concentrations of total-P (TP), dissolved P (DP) and particulate P (PP) are much higher than 0.02 mg/L, the limiting concentration for lake water. This result showed the potential contamination of lake water from agricultural surface runoff. Accumulated TP losses were 3.8 and 18.8 mg/m2 for ricefield and cropland, respectively. The estimated annual loss of TP was 0.74 kg/(hm2 · a) for cropland. Most of P loss is in the PP form, which accounts for more than 90% of TP loss for cropland.

关键词： Concentration (process) Crops Lakes Phosphorus Sediments Soils Watersheds

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Cultivation of Strictly Anaerobic Syntrophic Aromatic Compounds Degrading Microbe

Cultivation of Strictly Anaerobic Syntrophic Aromatic Compou...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

作者： S.Hanada A.Ohashi H.Harada Y.Kamagata Y.Sekiguchi dept.of Social and Environmental Engineefing Hiroshima UniversityHigashi-hiroshimaJapan dept.of Civil Engineering Tohoku UniversitySendaiJapan Research Institute of Genome-based Bio-faaory AISTSapporoJapan Institute for Biological Resources and Functions National Institute of Advanced Industrial Science and Technology(AIST)TsukubaJapan

Phenol has long been known to be degraded anaerobically in methanogenic environment. Methanogenic degradation of phenol is significant considering the wastewater treatment processes of industrial waste chemicals and biogeochemistry of namraUy occurring phenolic compounds in deep subsurface environment such as oil ***,despite the tremendous effort to

关键词： anaerobic bacterium syntrophic metabolism aromatic compound

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