Enhancement of partial nitrification performance of aerobic granular sludge by coordinating C/N loading rate

QIAN Feiyue; LIU Xiaopeng; ZHANG Nianqi; WANG Xiaoyi; WANG Jianfang; LIU Guoxun

doi:10.11949/j.issn.0438-1157.20160120

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Enhancement of partial nitrification performance of aerobic granular sludge by coordinating C/N loading rate

更新时间：2025-12-10

- Enhancement of partial nitrification performance of aerobic granular sludge by coordinating C/N loading rate
- CIESC Journal Issue 9, Pages: 3946-3953(2016)
- 作者机构：
  
  1. 苏州科技大学环境科学与工程学院,江苏,苏州,215009
  2. 江苏高校水处理技术与材料协同创新中心,江苏,苏州,215009
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160120
  CLC： 703.1
- Online First：05 September 2016，
  
  Published：05 September 2016
- 稿件说明：
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QIAN Feiyue, LIU Xiaopeng, ZHANG Nianqi, et al. Enhancement of partial nitrification performance of aerobic granular sludge by coordinating C/N loading rate[J]. CIESC Journal, 2016, (9): 3946-3953.
DOI：

QIAN Feiyue, LIU Xiaopeng, ZHANG Nianqi, et al. Enhancement of partial nitrification performance of aerobic granular sludge by coordinating C/N loading rate[J]. CIESC Journal, 2016, (9): 3946-3953. DOI： 10.11949/j.issn.0438-1157.20160120.

摘要

以异养颗粒污泥为接种污泥启动SBR反应器，通过协同调控进水碳、氮负荷比值，成功获得了具备短程亚硝化功能的自养型颗粒污泥。基于对粒径分布、胞外聚合物（EPS）和功能菌动力学活性的分析，系统阐述了影响污泥性状与功能演化的关键因素。结果表明，随着氨氧化菌（AOB）活性（μNO3-N）的持续增强和对亚硝酸盐氧化菌（NOB）活性（μNO3-N）的有效抑制，反应器对亚硝态氮（NO2--N）的累积速率可达1.34 kg·（m3·d）-1。污泥平均粒径由1.4 mm增至2.2 mm，颜色变为红棕色，沉降性能明显改善。得益于EPS的不断累积，颗粒污泥在高选择压条件下（沉淀时间3 min），仍能有效截留、固定AOB。曝气反应期间，游离氨（FA）和游离亚硝酸（FNA）对NOB的选择性抑制也是实现稳定亚硝化反应的重要原因。

Abstract

In order to start up an autotrophic partial nitrification process

the coordinated control of the influent C/N loading rate was carried out in the lab-scale sequencing batch reactor (SBR) inoculated with heterogeneous granular biomass. During the operation period

the evolution of granule size distribution

extracellular polymeric substances (EPS) composition and dynamics activities of functional microbes were also investigated to elaborate main factors for the conversion of sludge characteristics. The results showed that the nitrite nitrogen (NO2--N) accumulation rate of SBR would reach around 1.34 kg·(m3·d)-1

with the persistent enhancement of ammonia-oxidizing bacteria (AOB) activity and the effective inhibition of nitrite-oxidizing bacteria (NOB)

represented by specific removal (μNO3-N) and NO2--N accumulation (μNO3-N) rates

respectively. Moreover

the mean diameter of sludge granular increased from 1.4 mm to around 2.2 mm with the color of reddish brown

while its settling ability was improved significantly. Benefited from the accumulation of EPS contents

AOB could be immobilized by granular sludge effectively

even if the settling time of reaction cycle was set at 3 min. In addition

the selective inhibition of NOB caused by both free ammonia (FA) and free nitrous acid (FNA) during the aeration period was the other main factor for stable partial nitrification.

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