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1)  simultaneous nitrification and denitrification
同步硝化和反硝化
1.
Character of simultaneous nitrification and denitrification in a sequencing batch biofilm reactor.;
序批式膜反应器同步硝化和反硝化的特性
2.
The aim was to achieve simultaneous nitrification and denitrification.
该反应器能很好地创造缺氧微环境,载体生物膜具有吸附储碳能力,出现了良好的同步硝化和反硝化现象。
2)  simultaneous nitrification and denitrification
同步硝化反硝化
1.
Application of starch based degradable carrier in simultaneous nitrification and denitrification;
淀粉基可生物降解载体在同步硝化反硝化中的应用
2.
Heterotrophic nitrifiers and aerobic denitrifiers in process of simultaneous nitrification and denitrification disposing NH_4~+-N wastewater.;
异养型同步硝化反硝化处理氨氮废水及群落结构分析
3.
Study on simultaneous nitrification and denitrification and heterotrophic nitrification in membrane bioreactor;
MBR中同步硝化反硝化及异养硝化现象试验研究
3)  simultaneous nitrification-denitrification
同步硝化-反硝化
4)  simultaneous nitrification-denitrification
同步硝化反硝化
1.
The results showed that the approach of the nitrogen removal is the short-cut nitrification and the simultaneous nitrification-denitrification.
在反应器中存在着复杂的脱氮途径,实现了亚硝酸型同步硝化反硝化(SND)工艺,并且存在明显的好氧反硝化菌的脱氮作用。
2.
Short-cut nitrification-denitrification, simultaneous nitrification-denitrification and denitrifying phosphorus removal are novel biological nutrient removal technologies.
人们积极展开新型除磷脱氮理论及工艺的研究,其中短程硝化—反硝化脱氮、反硝化聚磷以及同步硝化反硝化工艺具有节约能源、减少污泥量和占地面积等优点,受到广泛地关注。
5)  simultaneous nitrification and denitrification(SND)
同步硝化反硝化
1.
Effect of sludge age and pH value on simultaneous nitrification and denitrification(SND);
污泥龄及pH值对同步硝化反硝化过程的影响
2.
An aerobic granular sludge membrane bioreactor(GMBR) had been stably operated for 71 days, and it showed good organics removal and simultaneous nitrification and denitrification(SND) performances.
好氧颗粒污泥膜生物反应器(GMBR)连续运行71d,对模拟生活污水表现出良好的有机物去除及同步硝化反硝化(SND)能力。
3.
The effects of dissolved oxygen(DO) concentration on simultaneous nitrification and denitrification(SND) were investigated using domestic wastewater with low C/N ratio in a modified pilot-scale Orbal oxidation ditch.
采用改良的Orbal氧化沟中试系统处理低C/N值生活污水,考察了溶解氧浓度对同步硝化反硝化(SND)的影响。
6)  SND
同步硝化反硝化
1.
The Effect of DO Concentration and Inlet COD Concentration on the SND in Porous Biological Particle Fluidized Bed;
多孔生物粒子流化床中DO和COD对同步硝化反硝化的影响
2.
Development and Expectation in Simultaneous Nitrification and Denitrification(SND);
生物脱氮新技术——同步硝化反硝化研究
3.
Taking actual domestic wastewater as influent substrate,the effect of DO,COD/TN and MLSS on simultaneous nitrification and denitrification(SND) was investigated in intermittent hybrid biological reactor(HBR) with available capacity of 12 L,filling rate of 30% and operation mode of instantaneous water inflow,aeration(660 min),sedimentation(40 min) and drainage(20 min).
以实际生活污水为处理对象,利用有效容积为12 L的间歇式复合生物反应器(填料填充率:30%,运行方式:瞬间进水—曝气660 min—沉淀40 min—排水20 min),研究了DO、COD/TN值、MLSS对同步硝化反硝化的影响。
补充资料:反硝化作用
      硝酸盐在某些微生物的作用下还原为气态氮的过程。多发生于沼泽、湖泊和渍水土壤等缺氧环境中。其反应过程可简示为:2HNO3─→2HNO2─→2HNO─→N2。参与作用过程的微生物主要是反硝化细菌。作用的强度主要取决于土壤中的氧浓度和土壤pH。所有的反硝化细菌都是兼气性细菌,反硝化作用只有在土壤中的氧浓度较低时才能进行。当氧浓度减至5%以下时,反硝化作用明显增强。在过湿的环境中或在通气土壤的局部嫌气区(如根际),都能测得较明显的反硝化作用。反硝化作用的最适pH为7.0~8.2。当pH低至5.2~5.8或高达8.2~9.0时,反硝化作用的强度都会显著减弱。
  
  在自然界,除上述通常由反硝化细菌引起的反硝化作用外,还常由以下途径使介质中的硝酸盐还原为气态氮:①某些微生物通过对硫的氧化或某些含硫化合物,而使硝酸盐还原:2S+6KNO3+2CaCO3─→2K2SO4+2CaSO4+2CO2+3N2。 ②通过纯化学过程使硝酸盐还原为气态氮。但这一过程与真正的反硝化作用不同。
  
  由于反硝化作用导致土壤氮或施入土壤中的氮肥中氮的损失,因而对植物生长不利。农业生产上常需采取措施改善土壤通气状况和调节土壤酸度,防止和减缓反硝化作用的发生。
  

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