Simultaneous heavy metal removal and sludge deep dewatering with Fe(II) assisted electrooxidation technology

Shaogang Hu, Jingping Hu, Yingfei Sun, Qian Zhu, Longsheng Wu, Bingchuan Liu, Keke Xiao, Sha Liang, Jiakuan Yang, Huijie Hou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A hybrid sludge conditioning strategy with electrooxidation and Fe(II) addition was used for heavy metal removal from sewage sludge and industrial sludge, with simultaneous sludge dewatering and stabilization. With the addition of 82 mg/g DS Fe(II) and treatment time of 4.5 h, heavy metal removals of 72.95% and 78.49% for Cu, 66.29% and 84.26% for Zn, and 36.52% and 36.99% for Pb were achieved from sewage sludge and industrial sludge samples respectively. The system pH decreased to 2.33 and 2.98 and the oxidation–reduction potential (ORP) values increased to 435.90 mV and 480.60 mV in sewage sludge and industrial sludge samples, respectively, which was conducive to the desorption and dissolution of heavy metals from sludge structures and the degradation of the organic compounds that complexed with heavy metals. In addition, the hybrid conditioning process demonstrated excellent dewatering performance due to the efficient electrochemical disintegration of sludge flocs together with the coagulation of sludge particles by Fe(III) generated via electrooxidation. The strong acidic and oxidative environment produced by the enhanced electrooxidation process was also responsible for pathogen inactivation.

Original languageEnglish
Article number124072
JournalJournal of Hazardous Materials
StatePublished - 5 Mar 2021
Externally publishedYes


  • Electrochemical oxidation
  • Heavy metal distributions
  • Heavy metal removal
  • Sludge dewatering
  • Sludge stabilization


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