KONGHaixia,WANGKaichong,LüYongtao.Performance of Polydimethyldiallylammonium Chloride-Ferric Sulfate in Conditioning Sludge for Dewatering[J].China Water & Wastewater,2026,42(3):109-114.
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Performance of Polydimethyldiallylammonium Chloride-Ferric Sulfate in Conditioning Sludge for Dewatering

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第42卷 Number: 第3期 Page: 109-114 Column: Date of publication: 2026-02-01
Author(s):
KONG　Haixia1;  WANG　Kaichong2;  Lü　Yongtao2
（1. Xi’an Branch， North China Municipal Engineering Design & Research Institute Co. Ltd.， Xi’an 710018， China； 2. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）
Keywords:
sludge dewatering;  conditioner;  polydimethyldiallylammonium chloride (PDMDAAC);  ferric sulfate (PFS);  extracellular polymeric substances (EPS);  protein
Abstract:
A composite conditioner of polydimethyldiallylammonium chloride and ferric sulfate (PDMDAAC-PFS) was prepared via a hydrothermal method. Under the optimal synthesis conditions of reaction temperature of 70 ℃ and reaction time of 3.50 h, the product exhibited viscosity of 49.3 mPa·s and Zeta potential of 19.42 mV. When dosed at 0.6 mL/gDS, the conditioner reduced the moisture content of the treated sludge to 63.3% and the capillary suction time to 36.3 s. Further analysis indicated that the conditioner significantly decreased the content of tightly bound extracellular polymeric substances (TB-EPS), particularly tryptophan-like proteins, thereby releasing a substantial amount of bound water. Meanwhile, Fe3+ promoted the re-flocculation of sludge particles into larger aggregates, synergistically improving sludge dewaterability.
Last Update: 2026-02-01