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Correlation between oxidation-reduction potential values and sludge dewaterability during pre-oxidation.

Yang Lv1, Keke Xiao1, Jiakuan Yang2

  • 1School of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei, 430074, China.

Water Research
|March 6, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces oxidation-reduction potential (ORP) as a rapid method to assess sludge dewaterability after pre-oxidation. The ΔORP index effectively correlates with key dewatering indicators, enabling faster optimization of treatment processes.

Keywords:
CorrelationOxidation-reduction potentialPre-oxidationSludge dewaterabilityWaste activated sludge

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Chemical Oxidation

Background:

  • Pre-oxidation enhances sludge dewaterability, but rapid evaluation of treatment effectiveness is challenging.
  • Traditional methods for assessing sludge dewaterability are time-consuming.
  • Optimizing oxidant type and dosage requires efficient monitoring tools.

Purpose of the Study:

  • To present oxidation-reduction potential (ORP) as a rapid parameter for evaluating sludge dewaterability after pre-oxidation.
  • To correlate the ΔORP index with established sludge dewaterability indicators.
  • To establish a rapid assessment tool for optimizing sludge pre-oxidation.

Main Methods:

  • Pre-oxidation of sludge samples with varying oxidant doses.
  • Measurement of oxidation-reduction potential (ORP) at different time points to calculate ΔORP.
  • Correlation analysis between ΔORP and indicators like specific resistance to filtration (SRF), bound water content, and Extracellular Polymeric Substances (EPS) composition.
  • Development of a multiple linear regression model.
  • Verification using laboratory-scale diaphragm filter press experiments.

Main Results:

  • The ΔORP index showed significant positive correlations with SRF, soluble and loosely-bound EPS organic carbon, zeta potential, and sludge cake Fe(III) content.
  • Negative correlations were observed between ΔORP and tightly-bound EPS components (tryptophan-like, tyrosine-like, microbial byproduct-like materials) and sludge particle sizes.
  • A multiple linear regression model effectively linked ΔORP to key dewatering factors.
  • An optimal oxone dose (0.4 mmol/g VS) was identified, associated with a ΔORP value of 387 mV.

Conclusions:

  • ΔORP serves as a feasible and rapid indicator for evaluating sludge dewaterability post-pre-oxidation.
  • This method can significantly expedite the optimization of oxidant type and dosage in sludge treatment.
  • The findings support the integration of ORP monitoring into sludge management strategies for improved efficiency.