ChenLei,LiNing,LiZhijian,et al.Effects of PFS and CaO Conditioning on Vertical High-pressure Filter Press Dewatering of Sludge[J].China Water & Wastewater,2026,42(15):104-110.
PFS与CaO调理对污泥立式高压压滤脱水的影响
- Title:
- Effects of PFS and CaO Conditioning on Vertical High-pressure Filter Press Dewatering of Sludge
- Keywords:
- deep dewatering; sludge conditioning; high-pressure filtration; moisture distribution; sludge structure
- 摘要:
- 选取了两种常用且机理不同（酸化-混凝和骨架作用）的无机调理剂——聚合硫酸铁（PFS）和生石灰（CaO），比较采用两种药剂分别调理后对市政脱水污泥立式高压压滤性能的影响。同时，分析了调理前后污泥pH、Zeta电位和粒径的变化，并借助低场核磁共振波谱（LF-NMR）、扫描电子显微镜（SEM）等研究了污泥调理前后水分形态和结构的演变规律。结果表明，采用PFS和CaO调理均能显著提升污泥立式高压压滤的脱水效果，两种调理剂的最佳投加量分别为5和20 mg/g。经过调理和高压压滤后，污泥含水率从80.13%分别降至51.34%和49.33%。PFS和CaO分别通过Fe3+和Ca2+中和污泥表面负电荷，提升污泥Zeta电位，减少污泥颗粒间的静电排斥力。PFS提供的酸性环境使胞外聚合物（EPS）发生了水解，CaO通过形成氢氧化钙及与生物絮体结合等作用，破坏了污泥絮体结构，以促进污泥中强结合水的释放。此外，经过PFS和CaO调理后的污泥表面变得粗糙、孔隙增多、粒径减小，使得水分更容易从污泥中排出。
- Abstract:
- Two representative inorganic conditioners—polyferric sulfate (PFS) and quicklime (CaO)—which operate via distinct mechanisms (acidification-coagulation and skeleton-building effects, respectively), were selected to compare their effects on the dewatering performance of municipal sludge during vertical high-pressure filtration. Meanwhile, the changes in pH, Zeta potential, and particle size distribution of sludge before and after conditioning were analyzed. Advanced analytical techniques including low-field nuclear magnetic resonance (LF-NMR) spectroscopy and scanning electron microscopy (SEM) were employed to investigate the evolution patterns of water states and microstructural characteristics in sludge during the conditioning process. The results demonstrated that both PFS and CaO conditioning significantly improved the dewatering performance of sludge under vertical high-pressure filtration, with the optimal dosages determined to be 5 mg/g and 20 mg/g, respectively. Following conditioning and high-pressure treatment, the sludge moisture content decreased from 80.13% to 51.34% for PFS-conditioned samples and to 49.33% for CaO-conditioned samples. PFS and CaO neutralized the negative surface charges of sludge through Fe3+ and Ca2+, respectively, thereby increasing the Zeta potential and reducing electrostatic repulsion between sludge particles. The acidic environment generated by PFS induced hydrolysis of extracellular polymeric substances (EPS), while CaO disrupted the sludge floc structure via calcium hydroxide formation and binding interactions with bioflocs; both conditioners promoted the release of strongly bound water in sludge. Furthermore, sludge conditioned with PFS and CaO exhibited a rougher surface, increased porosity, and reduced particle size, facilitating the release of water from the sludge.
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