共查询到17条相似文献,搜索用时 78 毫秒
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异养硝化菌的脱氮研究 总被引:1,自引:0,他引:1
采用多种选择性培养基进行了异养硝化菌株的筛选,对其生长特性和培养条件进行了研究.随后,又对异养硝化菌强化活性污泥对城市生活污水的处理效果进行了中试研究.试验证明,异养硝化菌能够提高传统污水生物处理的脱氮效率,并有较好的生物絮凝效果,出水氨氮基本监测不出,总氮去除率达80%以上,大大提高了出水水质. 相似文献
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同步硝化反硝化(SND)生物脱氮技术与传统生物脱氮技术相比,具有节省碳源、减少曝气量、可实现单级生物脱氮等优点.故近年来受到水处理工作者的广泛关注。移动床生物膜反应器工艺是20世纪80年代初发展起来的一种新型水处理工艺,发展十分迅速。该文介绍了移动床生物膜反应器(MBBR)的工艺原理及工艺特点,主要总结了国内在同步硝化反硝化技术中的研究和应用进展,指出了该项技术的发展方向和趋势。 相似文献
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对垃圾渗滤液间歇曝气(曝气时DO为5.5~7 mg/L;停止时DO为1.1~5.5 mg/L),在仅有有机碳、无机氮的条件下进行好氧反硝化作用.通过正交试验确定了好氧反硝化的最佳条件为水力停留时间168 h,DO为5.5~7 mg/L,有机碳源为乙醇,当有机碳源为乙醇时C/N为10.并得出影响好氧反硝化作用因素的重要性排序依次为C/N>水力停留时间>有机碳源>DO.C/N是影响好氧反硝化的主要因素,对TN去除率有高度显著的影响;水力停留时间对TN去除率有显著影响;有机碳源对TN去除率有一定影响;DO对TN去除率没有显著影响. 相似文献
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同步硝化反硝化的影响因素研究 总被引:6,自引:1,他引:5
为了深入研究同步硝化反硝化(SND)的影响因素,试验研究了SBR工艺中C/N、DO和pH对SND率的影响.试验结果表明,在DO=0.45 mg/L、C/N在3.33~8.32的情况下,SND率随着C/N的升高而线性升高.当C/N超过8.32时,SND率增速减缓.在C/N=8.32、DO 0.2~0.4 mg/L的情况下,SND率随DO的升高而升高,当DO超过0.4 mg/L时,SND率开始下降.在C/N=8.32、pH处于7.6~8.4的情况下,SND率随着pH的增加先升高后下降,当pH处于8时,SND率达到最高. 相似文献
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为快速启动好氧颗粒污泥反应器,在SBR反应器中同时接种硝化污泥和厌氧颗粒污泥,控制反应条件,温度23~25℃,pH值7.5~8.5,DO质量浓度1.5 mg/L左右,15 d即完成反应器快速启动。形成的好氧颗粒污泥粒径1.5~2.5 mm,SVI值54 mL/g。颗粒污泥结构紧密,沉降性能良好。反应器连续运行40多天,改变进水COD及NH4+-N浓度,COD和NH4+-N去除率均能稳定在80%以上,反应器内发生了同步硝化反硝化过程。 相似文献
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In this study, simultaneous nitrification and autotrophic denitrification (SNAD) with either elemental sulfur or pyrite were investigated in fluidized bed reactors in mesophilic conditions. The reactor performance was evaluated at different ammonium (12-40 mg/L of NH4+-N), nitrate (35-45 mg/L of NO3--N), and dissolved oxygen (DO) (0.1-1.5 mg/L) concentrations, with a hydraulic retention time of 12 h. The pyrite reactor supported the SNAD process with a maximum nitrogen removal efficiency of 139.5 mg/(L·d) when the DO concentration was in the range of 0.8-1.5 mg/L. This range, however, limited the denitrification efficiency of the reactor, which decreased from 90.0% ± 5.3% in phases II-V to 67.9% ± 7.2% in phases VI and VII. Sulfate precipitated as iron sulfate (FeSO4/Fe2(SO4)3) and sodium sulfate (Na2SO4) minerals during the experiment. The sulfur reactor did not respond well to nitrification with a low and unstable ammonium removal efficiency, while denitrification occurred with a nitrate removal efficiency of 97.8%. In the pyrite system, the nitrifying bacterium Nitrosomonas sp. was present, and its relative abundance increased from 0.1% to 1.1%, while the autotrophic denitrifying genera Terrimonas, Ferruginibacter, and Denitratimonas dominated the community. Thiobacillus, Sulfurovum, and Trichlorobacter were the most abundant genera in the sulfur reactor during the entire experiment. 相似文献