Ultrasonic application to boost hydroxyl radical formation during Fenton oxidation and release organic matter from sludge

Changxiu Gong, Jianguo Jiang*, De'an Li, Sicong Tian

*Corresponding author for this work

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17 Citations (Scopus)
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Abstract

We examined the effects of ultrasound and Fenton reagent on ultrasonic coupling Fenton oxidation (U+F) pre-treatment processes for the disintegration of wastewater treatment plant sludge. The results demonstrated that U+F treatment could significantly increase soluble chemical oxygen demand (SCOD), total organic carbon (TOC), and extracellular polymeric substances (EPS) concentrations in sludge supernatant. This method was more effective than ultrasonic (U) or Fenton oxidation (F) treatment alone. U+F treatment increased the release of SCOD by 2.1-and 1.4-fold compared with U and F alone, respectively. U+F treatment increased the release of EPS by 1.2-fold compared with U alone. After U+F treatment, sludge showed a considerably finer particle size and looser microstructure based on fluorescence microscopy, and the concentration of hydroxyl radicals (OH•) increased from 0.26 mM by F treatment to 0.43 mM by U+F treatment based on fluorescence spectrophotometer. This demonstrated that U+F treatment improves the release of organic matter from sludge.

Original languageEnglish
Article number11419
Pages (from-to)1-8
Number of pages8
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - 12 Jun 2015
Externally publishedYes

Bibliographical note

Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • POLYMERIC SUBSTANCES EPS
  • WASTE-ACTIVATED-SLUDGE
  • ANAEROBIC CO-DIGESTION
  • SEWAGE-SLUDGE
  • EXCESS SLUDGE
  • WATER SLUDGE
  • DISINTEGRATION
  • PRETREATMENT
  • DEGRADATION
  • PHOSPHORUS

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