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生物反硝化处理化肥废水的试验研究
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作者 王小英 王向英 《山西化工》 2005年第4期15-16,53,共3页
用SBR反应器处理人工合成的化肥废水,以醋酸钾作为碳源,在37℃下将氯化钙浓度升至96.7 g/L,pH值控制在6.8~7.2.实验结果表明:生物反硝化作用在极端的环境条件下是可行的,可用于处理未经稀释的化肥废水.当氯化钙浓度从4.8 g/L升至96.7 ... 用SBR反应器处理人工合成的化肥废水,以醋酸钾作为碳源,在37℃下将氯化钙浓度升至96.7 g/L,pH值控制在6.8~7.2.实验结果表明:生物反硝化作用在极端的环境条件下是可行的,可用于处理未经稀释的化肥废水.当氯化钙浓度从4.8 g/L升至96.7 g/L时,反硝化体积速率从76.8(mg·N)/(L·h)减少到1.7(mg·N)/(L·h). 展开更多
关键词 生物反硝化作用 化肥废水 抑制 高浓度氯化钙 高盐度
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农业土壤N_2O产生途径及其影响因素研究进展 被引量:13
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作者 谭立山 《亚热带农业研究》 2017年第3期196-204,共9页
基于目前国内外对农业土壤N_2O产生与排放过程的研究成果,分析了N_2O的产生途径及其研究方法、影响农业N_2O产生的主要因素。农业土壤N_2O产生的主要过程有硝化作用(自养硝化作用和异养硝化作用)、反硝化作用和硝化微生物反硝化作用。... 基于目前国内外对农业土壤N_2O产生与排放过程的研究成果,分析了N_2O的产生途径及其研究方法、影响农业N_2O产生的主要因素。农业土壤N_2O产生的主要过程有硝化作用(自养硝化作用和异养硝化作用)、反硝化作用和硝化微生物反硝化作用。目前研究硝化和反硝化作用的研究方法主要包括15N示踪法和气体抑制剂抑制法;影响土壤硝化—反硝化作用及N_2O产生的因素主要包括土壤基质、土壤物理性质、土壤化学性质、生物因素以及人类活动等。在此基础上探讨了目前研究中存在的主要问题,并对今后研究提出展望与建议。 展开更多
关键词 N2O产生途径 硝化作用 硝化作用 硝化生物反硝化作用
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Performance of simultaneous nitrification and denitrification in lateral flow biological aerated filter 被引量:1
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作者 龙腾锐 《Journal of Chongqing University》 CAS 2006年第4期223-228,共6页
A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has ... A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has the function of nitrification and removing organic substrate. In this study, we focused on the denitrification performance of LBAF and its possible mechanism under thorough aeration. We identified the existence of simultaneous nitrification and denitrification (SND) by analyzing nitrogenous compounds along the flow path of LBAF and supportive microbial microscopy, and studied the effects of air/water ratio and hydraulic loading on the performance of nitrogen removal and on SND in LBAF to find out the optimal operation condition. It is found that for saving operation cost, aeration can be reduced to some degree that allows desirable removal efficiency of pollutants, and the optimal air/water ratio is 10:1. Hydraulic loading less than 0.43 m h?1 hardly affects the nitrification and denitrification performance; whereas higher hydraulic loading is unfavorable to both nitrification and denitrification, far more unfavorable to denitrification than to nitrification. 展开更多
关键词 lateral flow biological aerated filter simultaneous nitrification and denitrification air/water ratio hydraulic loading
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Enhanced Performance of Denitrifying Sulfide Removal Process by 1,2-Naphthoquinone-4-Sulphonate 被引量:1
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作者 Liu Chunshuang Han Kang +4 位作者 Zhao Dongfeng Guo Yadonag Liu Lihong Liu Fang Zhao Chaocheng 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2016年第1期22-28,共7页
The denitrifying sulfide removal(DSR) process with bio-granules comprising both heterotrophic and autotrophic denitrifiers can simultaneously convert nitrate, sulfide and acetate species into di-nitrogen gas, elementa... The denitrifying sulfide removal(DSR) process with bio-granules comprising both heterotrophic and autotrophic denitrifiers can simultaneously convert nitrate, sulfide and acetate species into di-nitrogen gas, elemental sulfur and carbon dioxide, respectively, at high loading rates. This study has determined that the reaction rate of sulfide oxidized into sulfur could be enhanced in the presence of 1,2-naphthoquinone-4-sulphonate(NQS). The presence of NQS mitigated the inhibition effects of sulfide species on denitrification. Furthermore, the reaction rates of nitrate and acetate to nitrogen gas and CO_2, respectively, were also promoted in the presence of NQS, thereby enhancing the performance of DSR granules. The advantages and disadvantages of applying the NQS-DSR process are discussed. 展开更多
关键词 denitrifying sulfide removal NQS inhibition bio-granules
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Isolation and phylogenetic analysis of heterotrophic nitrobacteria 被引量:1
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作者 苏俊峰 马放 +3 位作者 郭静波 侯宁 高珊珊 王弘宇 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第6期790-793,共4页
A method about the isolation of heterotrophic nitrosobactria and the characteristics of heterotrophic nitrosobactria were studied.It can be seen from the fluorescence in situ hybridization results of the bio-membrane ... A method about the isolation of heterotrophic nitrosobactria and the characteristics of heterotrophic nitrosobactria were studied.It can be seen from the fluorescence in situ hybridization results of the bio-membrane sample from the bio-ceramic reactor,the spots of green nitrosobacteria are obviously more than those of orange nitrobacteria.Two heterotrophic nitrobacteria were isolated from the bio-ceramic reactor.By sequencing 16SrDNA and establishing the phylogenic tree,they were identified physiologically and biochemically as Pseudomonas sp..After 12 d,the COD removal efficiency of wgy55 and wgy68 were 45.03% and 50.85%,the NH4-N removal efficiency of them were 80.12% and 85.93%,and the TN removal efficiency of them were 69.71% and 64.7%.The final concentration of NO2-N of wgy55 and wgy68 was 0.753 mg/L and 0.601 mg/L,and that of NO3-N was 3.21 mg/L and 3.38 mg/L.These results show that wgy55 and wgy68 have the capability of nitrification and they are heterotrophic nitrobacteria. 展开更多
关键词 bio-ceranfic reactor fluorescence in situ hybridization heterotrophic nitrification
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消落带生态系统氮素截留转化的主要机制及影响因素 被引量:17
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作者 杨丹 樊大勇 +4 位作者 谢宗强 张爱英 熊高明 赵常明 徐文婷 《应用生态学报》 CAS CSCD 北大核心 2016年第3期973-980,共8页
消落带是陆地与水体(河流、湖泊、水库、湿地以及其他特殊水体)之间的生态过渡带,具有独特的生态水文学和生物地球化学过程,是截留和转化NH4+、NO3-等非点源氮素进入水体的最后一道生态屏障.整合已有相关研究成果发现:1)植物固持作用改... 消落带是陆地与水体(河流、湖泊、水库、湿地以及其他特殊水体)之间的生态过渡带,具有独特的生态水文学和生物地球化学过程,是截留和转化NH4+、NO3-等非点源氮素进入水体的最后一道生态屏障.整合已有相关研究成果发现:1)植物固持作用改变氮素在土壤-植被-土壤-大气中相对存在位置;2)微生物反硝化作用将氮素从系统内永久性地去除,是消落带生态系统氮素截留转化的主要机制,但其相对贡献率仍有很大的不确定性.在不同流域背景条件下,影响消落带生态系统氮素生物地球化学循环的主要生态因子变化较大,很难确定地下水位高低、植被状况、微生物属性和土壤基质等哪一个生态因子是驱动消落带生态系统氮素循环的关键因子.研究方法的局限性、大的时空尺度数据的缺乏及对植被宽度认识的模糊性,是导致消落带生态系统氮素截留转化结果变异性大的主要原因.因此,应在消落带生态系统具体研究区位环境因子基础上,利用数学模型、GIS、RS等分析方法及同位素示踪和气体联用测定等定量分析技术,从不同时空尺度研究消落带生态系统氮素的循环与转化规律,以实现消落带生态系统氮素截留转化最优化,为消落带生态系统的科学管理提供理论基础. 展开更多
关键词 生物硝化-硝化作用 生物地球化学过程 富营养化 生态水文过程 植物吸收
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