Transformation of Fe<sup>3+</sup> and its effect on anoxic sludge flocculation in A<sup>2</sup>O process

Lanhe ZHANG; Mingshuang ZHANG; Jingbo GUO; Yanping JIA; Zheng LI; Zicheng CHEN

doi:10.11949/j.issn.0438-1157.20180793

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Transformation of Fe³⁺ and its effect on anoxic sludge flocculation in A²O process

Energy and environmental engineering | 更新时间：2026-07-24

- Transformation of Fe³⁺ and its effect on anoxic sludge flocculation in A²O process
- CIESC Journal Vol. 70, Issue 3, Pages: 1089-1098(2019)
- 作者机构：
  
  1.东北电力大学化学工程学院, 吉林省吉林市132012
  2.吉林建筑大学松辽流域水环境教育部重点实验室,吉林长春 130118
  3.东北电力大学建筑工程学院, 吉林省吉林市 132012
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180793
  CLC： X 703
- Received：13 July 2018，
  
  Revised：2018-11-03，
  
  Online First：24 July 2026，
  
  Published：05 March 2019
- 稿件说明：
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张兰河, 张明爽, 郭静波, 贾艳萍, 李正, 陈子成. Fe³⁺在A²O工艺缺氧区的转化规律及其对污泥絮凝性的影响[J]. 化工学报, 2019, 70(3): 1089-1098 DOI: 10.11949/j.issn.0438-1157.20180793.

ZHANG Lanhe, ZHANG Mingshuang, GUO Jingbo, JIA Yanping, LI Zheng, CHEN Zicheng. Transformation of Fe³⁺ and its effect on anoxic sludge flocculation in A²O process[J]. CIESC Journal, 2019, 70(3): 1089-1098 DOI: 10.11949/j.issn.0438-1157.20180793.
张兰河, 张明爽, 郭静波, 贾艳萍, 李正, 陈子成. Fe³⁺在A²O工艺缺氧区的转化规律及其对污泥絮凝性的影响[J]. 化工学报, 2019, 70(3): 1089-1098 DOI: 10.11949/j.issn.0438-1157.20180793. DOI：

ZHANG Lanhe, ZHANG Mingshuang, GUO Jingbo, JIA Yanping, LI Zheng, CHEN Zicheng. Transformation of Fe³⁺ and its effect on anoxic sludge flocculation in A²O process[J]. CIESC Journal, 2019, 70(3): 1089-1098 DOI: 10.11949/j.issn.0438-1157.20180793. DOI：

摘要

为了研究铁元素对A

O工艺污泥絮凝性的影响，考察Fe

在污泥上清液、胞外聚合物（extracellular polymeric substances，EPS）与底泥（Pellet）中的分布和迁移转化规律，结合三维荧光光谱（3D-EEM）、原子吸收和X射线衍射仪（XRD）分析Fe的存在形态和结构特征，揭示Fe

与微生物代谢产物的作用机制，探索Fe

对脱氮除磷效率的影响。结果表明：低浓度Fe

（

10 mg·L

-1

）能够提高COD和TN去除率，促进微生物活性，增强污泥生物絮凝性；高浓度Fe

（10~40 mg·L

-1

）则抑制微生物活性，使EPS总量升高，污泥絮体脱稳，LB、TB层PN/PS是影响污泥絮凝性的关键因素；Fe

的投加强化生物除磷效率，当Fe

浓度为40 mg·L

-1

时，TP去除率为93%。Fe

在污泥混合液中的分布规律为TB

上清液

SMP，Fe

在生物体内富集累积，能够改变EPS各层的组分。

Abstract

To study the effect of iron on the flocculation of A

O process sludge

the distribution and migration and tranformation of Fe

in sludge supernatant

extracellular polymeric substances (EPS) and sediment (Pellet) were investigated. A large amount of wastewater containing Fe

was generated in the rapidly developed industries such as metallurgy

electroplate and mineral separation. Fe

entered the sewage biological treatment system and could affect the sludge biological flocculation and the removal of COD

TN and TP. Information on the morphology

structure change

migration and conversion of iron ions in the anaerobic

anoxic and oxic sludge was scrace. The occurrence form and structural characteristics of iron ions were analyzed and the interaction mechanism between Fe

and microbial metabolites was revealed based on the analyses of three-dimensional excitation (3D-EEM)

atom absorption and X-ray diffraction (XRD). The effect of Fe

on the denitrification and phosphorus removal was explored. The results showed that low concentration of Fe

(

10 mg·L

-1

) could improve COD and TN removal

promote microbial activity and enhance the biological flocculation of sludge. When Fe

increased from 0 to 10 mg·L

-1

the removal efficiency of COD and TN increased from 42% and 37% to 60% and 45%

respectively

while the dehydrogenase activity increased from 20.09 mg·(L·h)

-1

to 31.91 mg·(L·h)

-1

. The flocculation ability (FA) increased from 30% to 53% and the maximum sludge particle size was 43.3 µm. High concentration of Fe

could inhibit microbial activity

increase EPS content and induce sludge deflocculation. When Fe

concentration increased from 10 mg·L

-1

to 40 mg·L

-1

the removal efficiency of COD and TN decreased

by 28% and 34%

respectively. Protein (PN)/polysaccharide (PS) in loosely bound EPS(LB) and tightly bound EPS(TB) was the key factor affecting the flocculation of sludge. Fe

addition could enhance TP removal efficiency and it was 93% when Fe

was 40 mg·L

-1

. Fe

concentration distribution in the sludge was TB

supernatant

soluble microbial products(SMP)

and the main form of Fe element in the sludge was Fe

. The iron content of different forms changed with the increase of Fe

concentration. In addition

could enrich and accumulate in the microorganism cells and could change the composition of EPS layers.

关键词

Keywords

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Transformation of Fe3+ and its effect on anoxic sludge flocculation in A2O process

DOI：10.11949/j.issn.0438-1157.20180793

摘要

Abstract

关键词

Keywords

references

Transformation of Fe³⁺ and its effect on anoxic sludge flocculation in A²O process