西安建筑科技大学学报(自然科学版)

为揭示优化后的缺氧反硝化系统在处理高NO-2和NO-3废水时的脱氮效果和N2O产生情况,采用序批式活性污泥反应器(SBR),研究优化后的污泥系统在初始NO-2-N浓度为300 mg/L和400 mg/L时,不同进水C/N条件下反硝化过程脱氮和N2O产生情况,同时对比初始浓度为500 mg/L、C/N为2时,不同电子受体情况下N2O的产生情况.研究结果表明:反硝化污泥系统优化后,反硝化速率提升了1.29倍,脱氮性能逐渐增强,N2O累计逸出量降低了100倍,污泥系统中的脱氮优势菌群为陶厄氏菌属(Thauera),所占比例从23.5%增加到76.4%; 初始NO-2-N浓度为300 mg/L和400 mg/L时,不同进水条件下,系统均可表现出较强的反硝化能力,反硝化过程中N2O最大转化率仅为0.104%; 初始浓度提高到500 mg/L,C/N为2,以NO-3-N为电子受体时,反应过程NO-2-N最大积累量仅为22.46 mg/L,溶解态N2O始终维持在0.304 mg/L左右,而以NO-2-N为电子受体时,溶解态N2O峰值达到0.765 mg/L,但N2O最大转化率仅为0.066%; 反硝化污泥系统优化后,对高硝氮废水可表现出较强的反硝化能力,同时反硝化过程N2O的产量较低.

To reveal the denitrification effect and N2O production of the optimized anoxic denitrification system in the treatment of high NO-2and NO-3 wastewater,a sequencing batch activated sludge reactor was used to study the production of N2O in the optimized denitrification process under different C/N ratio when the initial NO-2-N concentrations were 300 mg/L and 400 mg/L.Simultaneously, when the initial concentration was 500mg/L and C/N was 2, the production of N2O under different electron acceptors was compared.Results show that after the denitrification sludge system was optimized, the denitrification rate increased by 1.29 times and the denitrification performance was gradually enhanced.Meanwhile,the accumulated N2O emission was reduced 100 times.The proportion of Thauera increased from 23.5% to 76.4%, becoming the major microbial community in the denitrifying system.When the initial concentration of NO-2-N was 300 mg/L and 400 mg/L, the system can show strong denitrification ability under different influent conditions.The maximum conversion rate of N2O was only 0.104%.The C/N was 2 and initial concentration increased to 500 mg/L, the maximum accumulation of NO-2-N was only 22.4 mg/L and the dissolved N2O was maintained at about 0.304mg/L when the NO-3-N was an electron acceptor.When the NO-2-N was an electron acceptor, the dissolved N2O peak value reaches 0.765 mg/L but the conversion rate of N2O is only 0.066%.After the denitrification sludge system was optimized, it can show stronger denitrification ability for high nitrate nitrogen wastewater, and it can reduce the amount of N2O produced in denitrification process.

引言
1 材料与方法
2 结果与分析
3 结论

图1 试验装置图<br/>Fig.1 Schematic diagrams of experimental systems

图1 试验装置图
Fig.1 Schematic diagrams of experimental systems

表1 人工配制废水组分及浓度<br/>Tab.1 Manual preparation of wastewater components and concentrations

表1 人工配制废水组分及浓度
Tab.1 Manual preparation of wastewater components and concentrations

表2 反硝化系统优化过程脱氮效率变化<br/>Tab.2 Nitrogen removal efficiency change during denitrification system optimization

表2 反硝化系统优化过程脱氮效率变化
Tab.2 Nitrogen removal efficiency change during denitrification system optimization

图2 反硝化污泥系统优化过程中微生物群落结构:分布图的里、外圈分别表示门和属组成结构<br/>Fig.2 Community structure of sludge microorganisms during denitrification system optimization:The inner and outer circles of the distribution map representing the structure of the gate and the genus

图2 反硝化污泥系统优化过程中微生物群落结构:分布图的里、外圈分别表示门和属组成结构
Fig.2 Community structure of sludge microorganisms during denitrification system optimization:The inner and outer circles of the distribution map representing the structure of the gate and the genus

表3 不同NO-2-N初始浓度对比试验数据<br/>Tab.3 Comparison of experimental data of different NO-2-N initial concentrations

表3 不同NO-2-N初始浓度对比试验数据
Tab.3 Comparison of experimental data of different NO-2-N initial concentrations

图3 NO-2-N为300 mg/L时COD、NO-2-N和N2O的变化<br/>Fig.3 Variations of COD、NO-2-N and N2O when NO-2-N is 300 mg/L

图3 NO-2-N为300 mg/L时COD、NO-2-N和N2O的变化
Fig.3 Variations of COD、NO-2-N and N2O when NO-2-N is 300 mg/L

表4 不同电子受体情况下反硝化系统中各参数变化<br/>Tab.4 Changes of various parameters in denitrification system under different electron acceptor conditions

表4 不同电子受体情况下反硝化系统中各参数变化
Tab.4 Changes of various parameters in denitrification system under different electron acceptor conditions

图4 不同电子受体时COD、NO-3-N、NO-2-N和N2O的变化情况<br/>Fig.4 Changes of COD, NO-3-N, NO-2-N and N2O in different electron acceptors

图4 不同电子受体时COD、NO-3-N、NO-2-N和N2O的变化情况
Fig.4 Changes of COD, NO-3-N, NO-2-N and N2O in different electron acceptors

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备注

引言

1 材料与方法

2 结果与分析

3 结论

期刊信息