Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge

XIA Jihua; RAO Ting; JI Juan; LIU Ankang; LIANG Yankai; SUN Yongjun

doi:10.11835/j.issn.2096-6717.2022.099

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Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge

Environmental Engineering | 更新时间：2023-05-25

- Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge
- Journal of Civil and Environmental Engineering Vol. 45, Issue 3, Pages: 173-182(2023)
- 作者机构：
  
  1.南京江北新区公用控股集团有限公司，南京 210044
  2.南京沃谱瑞环境研究院有限公司，南京 211100
  3.南京工业大学城市建设学院，南京 211816
- 作者简介：
  
  [ "XIA Jiahua (1981- ), senior engineer, main research interest: water construction operation management, E-mail: xiayu_610@sina.com. " ]
  SUN Yongjun （corresponding author）， PhD， associate professor， E-mail： sunyongjun@njtech.edu.cn.
- 基金信息：
  
  Natural Science Foundation of Jiangsu Province in China(BK20201362);2018 Six Talent Peaks Project of Jiangsu Province(JNHB-038)
- DOI：10.11835/j.issn.2096-6717.2022.099
  CLC： X703.1
- Received：01 August 2022，
  
  Published：25 June 2023
- 稿件说明：
移动端阅览
XIA Jihua, RAO Ting, JI Juan, et al. Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 173-182.
DOI：

XIA Jihua, RAO Ting, JI Juan, et al. Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 173-182. DOI： 10.11835/j.issn.2096-6717.2022.099.

摘要

针对污水处理厂污泥脱水难度大、运行成本高等问题，深入研究NaClO投加量、污泥混合液pH值以及在NaClO最佳投加量和污泥混合液最佳pH值下耦合聚合硫酸铁（PFS）和三氯化铁（FeCl

）对污泥脱水性能的影响，以期获得氧化—絮凝调理对活性污泥脱水性能的影响机制。结果表明，在NaClO投加量为40 mg/g DS（绝干污泥）和污泥混合液pH值为3时，PFS耦合NaClO调理后的泥饼含水率和污泥比阻（Specific Cake Resistance，SRF）分别降至85.86%和4.74×10

m/kg；FeCl

耦合NaClO调理后的泥饼含水率和污泥比阻分别降至86.36%和3.93×10

m/kg。调理后的污泥絮体粒径

的大小关系为：NaClO+PFS

NaClO+FeCl

pH值

原泥

NaClO。显然，经过氧化—絮凝调理后的污泥絮体粒径明显增大，滤液中的有机质含量降低。氧化—絮凝调理可使活性污泥比阻显著降低，脱水性能显著改善。NaClO耦合PFS和NaClO耦合FeCl

有望成为高效环保、价格低廉的新型污泥脱水调理剂。

Abstract

In view of the difficulty of sludge dewatering and high operating cost in wastewater treatment plants

the effect of NaClO dosage

pH value of the sludge mixture

and the coupling of polymerized ferric sulfate (PFS)/ ferric chloride (FeCl

) under the optimal dosage of NaClO and the optimum pH value of the sludge mixture on the dewatering performance of sludge were studied in depth

in order to obtain the influence mechanism of oxidation-flocculation conditioning on the dewatering performance of activated sludge. The results showed that when the dosage of NaClO was 40 mg/g DS and pH value of the sludge mixture was 3

the moisture content of mud cake and sludge specific resistance (SRF) after PFS coupled NaClO conditioning were reduced to 85.86% and 4.74×10

m/kg

respectively. The moisture content and sludge specific resistance of the mud cake after FeCl

coupling NaClO conditioning were reduced to 86.36% and 3.93×10

m/kg

respectively. The relationship of the conditioned sludge floc size

is: NaClO+PFS

NaClO+FeCl

pH value

raw sludge

NaClO. Obviously

after oxidation-flocculation conditioning

the particle size of the sludge flocs increased significantly

and the organic matter content in the filtrate decreased. Oxidation-flocculation conditioning can significantly reduce SRF and improve the dewatering performance. NaClO coupled PFS and NaClO coupled FeCl

are expected to be novel sludge dewatering conditioners with high efficiency

environmental protection and low price.

关键词

Keywords

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