ChenRen,LiNing,HuangTing,et al.Performance of Sludge-based Biochar Heat-storage Conditioner[J].China Water & Wastewater,2026,42(17):117-122.
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Performance of Sludge-based Biochar Heat-storage Conditioner

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第42卷 Number: 第17期 Page: 117-122 Column: Date of publication: 2026-09-01
Author(s):
Chen　Ren1;  Li　Ning1; 2; 3;  Huang　Ting2; 3;  Sun　Min1; 3;  Zhu　Bing2; 3
（1. School of Chemistry and Chemical Engineering， Hefei University of Technology， Hefei 230009， China； 2. Hefei Cement Research & Design Institute Co. Ltd.， Hefei 230022， China； 3. Anhui Key Laboratory of Green and Low?carbon Technology in Cement Manufacturing， Hefei 230022， China）
Keywords:
sludge;  biochar;  polyethylene glycol;  phase change material;  conditioner
Abstract:
Municipal sludge was used as the raw material to successfully synthesize sludge-based biochar through granulation and pyrolysis. The obtained biochar served as a carrier, into which polyethylene glycol (PEG) was impregnated and loaded as the phase-change core material, yielding a PEG/sludge-based biochar composite phase-change heat-storage conditioner. The structural characteristics and thermal performance of the prepared material were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and microcalorimetry. The results indicated that the prepared sludge-based biochar heat-storage conditioner exhibited stable phase-change thermal storage capability. The mass fraction of loaded PEG reached 77.9%, with a melting latent heat of 45.65 J/g, demonstrating favorable shape-stabilized phase-change behavior and cyclic stability. Furthermore, it could promote microbial heat release and thus enhance the efficiency of bio-drying systems.
Last Update: 2026-09-01