Effect of aeration intensity on simultaneous biological nitrogen removal and N<sub>2</sub>O release from SBBR

Youkui GONG; Yongzhen PENG

doi:10.11949/0438-1157.20190522

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Effect of aeration intensity on simultaneous biological nitrogen removal and N₂O release from SBBR

Energy and environmental engineering | 更新时间：2020-06-24

- Effect of aeration intensity on simultaneous biological nitrogen removal and N₂O release from SBBR
- CIESC Journal Vol. 70, Issue 11, Pages: 4410-4419(2019)
- 作者机构：
  
  1.烟台职业学院建筑工程系，山东烟台 264670
  2.北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室，北京 100124
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190522
  CLC： X 703.1
- Received：19 May 2019，
  
  Revised：2019-06-15，
  
  Published：05 November 2019
- 稿件说明：
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巩有奎, 彭永臻. 曝气强度对SBBR同步生物脱氮及N₂O释放影响[J]. 化工学报, 2019, 70(11): 4410-4419 DOI: 10.11949/0438-1157.20190522.

GONG Youkui, PENG Yongzhen. Effect of aeration intensity on simultaneous biological nitrogen removal and N₂O release from SBBR[J]. CIESC Journal, 2019, 70(11): 4410-4419 DOI: 10.11949/0438-1157.20190522.
巩有奎, 彭永臻. 曝气强度对SBBR同步生物脱氮及N₂O释放影响[J]. 化工学报, 2019, 70(11): 4410-4419 DOI: 10.11949/0438-1157.20190522. DOI：

GONG Youkui, PENG Yongzhen. Effect of aeration intensity on simultaneous biological nitrogen removal and N₂O release from SBBR[J]. CIESC Journal, 2019, 70(11): 4410-4419 DOI: 10.11949/0438-1157.20190522. DOI：

摘要

以生活污水为处理对象，采用碳纤维填料制成序批式生物膜反应器（sequencing batch biofilm reactor，SBBR），采用N

联合曝气的方式，通过改变N

和O

的比例，稳定系统内DO浓度为1.5 mg/L，考察不同曝气强度（30、20和10 L/h）下系统脱氮性能及N

O释放特性。异养菌和硝化菌共生于生物膜内，异养菌位于外层，硝化菌位于内层，曝气强度降低有利于外部异养菌大量增殖，生物膜厚度增加。曝气强度为30 L/h和10 L/h条件下，SBBR系统

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http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=809825&type=

11.76866722

3.47133350

去除率分别为95%以上和79.2%±1.6%，同步脱氮效率分别为46.2%±2.6%和62.1%±2.3%，N

O产率分别为6.25%±0.6%和2.93%±0.43%。缺氧阶段，反硝化过程和PHA（聚

–羟基烷酸酯）积累同时发生；好氧阶段，PHA呈先增加后减少的趋势。初始阶段增加的PHA为后续同步发生的反硝化过程提供了电子供体。AOB的好氧反硝化过程和异养菌反硝化过程均可导致N

O的产生。曝气强度降低导致水力剪切力下降，生物膜内缺氧范围扩大，缺氧区N

O停留时间延长，利于其反硝化减量。曝气强度由30 L/h降至10 L/h，微生物胞外聚合物（EPS）分泌减少，PS/PN（多糖/蛋白质）由8.59 mg/mg降至6.58 mg/mg

生物膜致密性降低，碳源和N

O以扩散形式进入缺氧区域能力增强，N

O释放量降低。

Abstract

Using domestic wastewater as influent and carbon fibre as biological carriers

the characteristics of SND(simultaneous nitrification and denitrification) process and N

O emission were studied under different aeration intensity (30

10 L/h)

with the DO(dissolved oxygen) concentration controlled at 1.5 mg/L by adjusting the ratio of N

and O

. Hetertrophic and nitrifying bacteria conexisted in the biofilm

which are located in the outer and inner layers of the biofilm

respectively. The decrease of aeration intensity was beneficial to the proliferation of the external heterotrophic bacteria. With the aeration intensity was controlled at 30 L/h and 10 L/h

the removal efficiency of

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13.63133430

4.06400013

in the SBBR system were more than 95% and 79.2%±1.6%

the SND efficiency was 46.2%±2.6% and 62.1%±2.3%

the N

O yield was 6.25%±0.6% and 2.93%±0.43%

respectively. During the anoxic phase

the denitrification process and the accumulation of PHA (poly-

-hydroxyalkanoate) occurred simultaneously. In the following aerobic process

the PHA increased first and then decreased

which indicated that PHA could be used as internal carbon sources in the following denitrification process. Both the aerobic denitrification process of AOB and the denitrification process of denitrifying bacteria at the presence of lower oxygen led to the emissions of N

O. The decrease of aeration intensity leads to a decrease in hydraulic shearing force

an increase in the anoxic range in the biofilm

and an increase in the N

O residence time in the anoxic zone

which is beneficial to the denitrification reduction. As the aeration intensity decreased from 30 L/h to 10 L/h

the extracellular polymer (EPS) secretion decreased

and the PS/PN (polysaccharide/protein) decreased from 8.59 mg/mg to 6.58 mg/mg

resulting the reduction of the biofilm density

which created the favorable conditions for N

O transferring into the biofilm to complete the reduction process.

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Keywords

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⁰

Effect of aeration intensity on simultaneous biological nitrogen removal and N2O release from SBBR

DOI：10.11949/0438-1157.20190522

摘要

Abstract

关键词

Keywords

references

Effect of aeration intensity on simultaneous biological nitrogen removal and N₂O release from SBBR