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Related Experiment Video

Updated: Mar 27, 2026

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis
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Microwave-acid pretreatment: A potential process for enhancing sludge dewaterability.

Jibao Liu1, Yuansong Wei2, Kun Li1

  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.

Water Research
|January 7, 2016
PubMed
Summary

Combining microwave irradiation and acidification significantly improves sludge dewaterability. This hybrid treatment reduces bound water and enhances sludge fluidity by targeting specific protein-like polymers.

Keywords:
AcidActivated sludgeDewaterabilityMicrowaveRegression model

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Wastewater Management

Background:

  • Activated sludge dewatering is challenging due to high bound water content within sludge flocs.
  • Effective sludge dewatering is crucial for reducing disposal volumes and treatment costs.

Purpose of the Study:

  • To investigate the efficacy of a hybrid microwave irradiation and acidification treatment on activated sludge dewaterability.
  • To elucidate the underlying mechanisms responsible for improved sludge dewatering.

Main Methods:

  • Sludge samples were treated using a combination of microwave irradiation and acidification (100°C, pH 2.5).
  • Sludge dewaterability was assessed by measuring capillary suction time (CST) and bound water content.
  • Mechanisms were analyzed through zeta potential measurements, flocs size analysis, molecular weight distribution, and 3D-EEM.

Main Results:

  • The hybrid microwave-acid treatment significantly improved sludge dewaterability, reducing CST from 37.7 s to 9.2 s and bound water from 1.96 g/g DS to 0.88 g/g DS.
  • Treated sludge exhibited enhanced fluidity and reduced thixotropy.
  • Microwave heating promoted sludge disintegration, while acidification counteracted negative zeta potential and increased flocs size, ultimately improving dewaterability.

Conclusions:

  • The combined microwave-acid treatment is an effective method for enhancing activated sludge dewaterability.
  • Protein-like substances within a specific molecular weight range (10^4-10^5 Da) are key organic components influencing sludge dewaterability, rather than humic or fulvic acid-like substances.