共查询到20条相似文献,搜索用时 64 毫秒
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厌氧氨氧化工艺是治理水体氮污染的一种绿色、高效新型生物技术。然而,厌氧氨氧化菌世代时间长,对环境敏感性高,致使厌氧氨氧化系统启动缓慢、运行稳定性较低,进而导致厌氧氨氧化工艺在实际应用中受限。铁不仅是环境中普遍存在的金属元素,也是微生物生长所需的必要营养元素之一。本文综述了铁元素价态及投加量对基于厌氧氨氧化反应的废水脱氮工艺启动及运行过程中含氮污染物去除效果,分析铁元素存在时,铁/氮元素的反应途径、厌氧氨氧化菌生长速率、颗粒形成以及微生物群落组成演变等方面的作用关系,旨在深入探究和阐释元素铁对于厌氧氨氧化菌脱氮性能的内在作用机制,为实现工程化利用铁强化厌氧氨氧化系统脱氮过程、提高微生物活性提供科学指导。 相似文献
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通过对基于IC反应器为主体的同步脱氮除磷废水处理新工艺实验条件下一个多月运行情况分析,从数学角度建立了该工艺动力学模型。 相似文献
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低碳氮比废水脱氮研究进展 总被引:2,自引:0,他引:2
结合低碳氮比污水特点,评述了以内源提供有机碳源实现反硝化,以及利用自养菌脱氮的厌氧氨氧化和氢自养型反硝化等新型生物脱氮技术,介绍了它们在低碳氮比废水处理中的反应机理、应用进展、优势以及需要解决的问题。该项研究为经济高效地处理低碳氮比污水提供了理论依据。 相似文献
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采用固定床吸附和液相脱氮两种方法对直馏200号溶剂油进行了脱氮实验,并对脱氮后溶剂油外观,色度进行对比,精制后溶剂油外观为无色透明,赛氏色度不溃于 25,液相脱氮精制的溶剂油的外观性能更加稳定。储存安定性好。 相似文献
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单级生物脱氮技术研究 总被引:3,自引:0,他引:3
研究了将硝化菌和反硝化菌混合包埋,利用载体在对氧产生的扩散阻力在颗粒内部形成好氧区,缺氧区和厌氧区,使硝化和反硝化两个过程有机地结合在一起,在好氧条件下同时进行硝化和反硝化。 相似文献
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The effects of surface site distribution are examined and compared using thermal desorption techniques (in particular, Monte Carlo simulation schemes to simulate temperature-programmed desorption). Specifically, the effects of lateral interactions among adatoms, surface heterogeneity, initial surface coverage, and desorption energy have been studied. Surface heterogeneity effects have been examined for desorption of a single species only. The effects of lateral interactions on the desorption spectra for different types of site distributions (in this case, a 10-site patch distribution, an alternating site distribution, random site distributions, and for a cluster of molecules on the center of the surface surrounded by molecules of a different type) are studied. Lateral interactions among adatoms provided a broad range of results depending on sign and magnitude of the interaction. It is also found that as the site energy increased, a molecule was held to the surface much more strongly, and observed desorption did not occur until temperature increased. Results are shown for a single layer distribution. 相似文献
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The effects of surface site distribution are examined and compared using thermal desorption techniques (in particular, Monte Carlo simulation schemes to simulate temperature-programmed desorption). Specifically, the effects of lateral interactions among adatoms, surface heterogeneity, initial surface coverage, and desorption energy have been studied. Surface heterogeneity effects have been examined for desorption of a single species only. The effects of lateral interactions on the desorption spectra for different types of site distributions (in this case, a 10-site patch distribution, an alternating site distribution, random site distributions, and for a cluster of molecules on the center of the surface surrounded by molecules of a different type) are studied. Lateral interactions among adatoms provided a broad range of results depending on sign and magnitude of the interaction. It is also found that as the site energy increased, a molecule was held to the surface much more strongly, and observed desorption did not occur until temperature increased. Results are shown for a single layer distribution. 相似文献
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本文采用真空-质谱技术研究了紫外线照射下分子氧在锐钛矿型TiO_2表面的吸附和脱附机理。氧光助吸附后,锐钛矿表面成为活化表面。活化表面的O_2~-(分子氧在锐钛矿表面的吸附态)在1.33×10~(-3)Pa的真空中,在能量大于锐钛矿禁带宽度2.9eV的紫外线照射下成为分子氧脱附,氧脱附后的表面在无紫外线照射的氧气氛中对分子氧有吸附作用,该O_2~-饱和吸附量大于相同氧压下紫外线照射下O_2的饱和吸附量。在氧压和光强度相同的条件下,O_2~-吸附量与表面羟基化程度呈线性关系。 相似文献
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甲烷在高比表面积活性炭上吸附性能的研究 总被引:5,自引:0,他引:5
以中温沥青作为粘结剂,研究了石油焦基高比表面积活性炭的成型工艺对其甲烷吸附性能的影响。结果发现:随着粘结剂添加量的增大,成型活性炭对甲烷的质量吸附量逐渐减小,而体积吸附量差别不大;成型压力对成型活性炭的甲烷吸附性能没有明显影响;随着活化温度的提高和活化时间的延长,成型活性炭对甲烷的质量吸附量逐渐增多,而体积吸附量的变化不大;添加粘结剂沥青38%、88℃下炭化1.0hr后于88℃下活化1.5hr所得的高比表面积成型活性炭在299K、3.5MPa下对于甲烷的体积吸附量为170V/V,5.5MPa下的体积吸附量为237V/V。 相似文献
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