Enhanced sludge dewatering efficiency and mechanism of MnFe<sub>2</sub>O<sub>4</sub>/BC-activated PMS

YOU Kun; LIU Juntong; WANG Zinan; ZHAO Jingrui

doi:10.13205/j.hjgc.202604024

Volume 44 Issue 4

Apr. 2026

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2026 > 44(4): 229-239

YOU Kun, LIU Juntong, WANG Zinan, ZHAO Jingrui. Enhanced sludge dewatering efficiency and mechanism of MnFe2O4/BC-activated PMS[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(4): 229-239. doi: 10.13205/j.hjgc.202604024

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YOU Kun, LIU Juntong, WANG Zinan, ZHAO Jingrui. Enhanced sludge dewatering efficiency and mechanism of MnFe₂O₄/BC-activated PMS[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(4): 229-239. doi: 10.13205/j.hjgc.202604024

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Enhanced sludge dewatering efficiency and mechanism of MnFe₂O₄/BC-activated PMS

doi: 10.13205/j.hjgc.202604024

School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China

Received Date: 2025-06-25
Available Online: 2026-06-06
Publish Date: 2026-04-01

Abstract

Abstract

In order to enhance sludge dewatering efficiency， an MnFe₂O₄/BC/PMS system was constructed for sludge disintegration. Through single-factor and multi-factor experiments， the effects of MnFe₂O₄/BC dosage， PMS dosage， and reaction time on the sludge dewatering efficiency were investigated. The optimal process parameters for sludge dewatering and the primary-secondary relationship of environmental factors were clarified. By identifying the active substances in the MnFe₂O₄/BC/PMS system， the main free radicals released by MnFe₂O₄/BC-activated PMS to disintegrate sludge and the main pathways for EPS disintegration were determined. The results showed that the influence of environmental factors on the sludge moisture content （W_c） and total organic carbon （TOC） content followed the order of MnFe₂O₄/BC > PMS > reaction time. The order of influence of factor interactions on sludge dewatering performance was MnFe₂O₄/BC and PMS > PMS and reaction time > MnFe₂O₄/BC and reaction time. When the MnFe₂O₄/BC dosage was 132.99 mg/g DS， the PMS dosage was 421.80 mg/g DS， and the reaction time was 18 min， the sludge dewatering efficiency was the best， with the W_c and TOC content reaching 45.8% and 489.2 mg/L， respectively. The ·OH and SO₄^-· released from MnFe₂O₄/BC-activated PMS oxidized the protein main chain， leading to peptide chain breakage. This primarily reduced the protein content in the sludge from 174.6 mg/L to 75.7 mg/L， and especially in TB-EPS from 91.8 mg/L to 36.3 mg/L， thereby decreasing the hydrophilicity of EPS and improving sludge dewatering efficiency.
- spinel-type manganese ferrite/BC,
- peroxymonosulfate,
- advanced oxidation,
- sludge dewatering,
- free radicals,
- extracellular polymeric substances

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References(38)

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