Improvement of Sludge Dewatering Performance by Persulfate Advanced Oxidation Combined with Ldh: Synergistic Effect of Free Radical and Non-Free Radical and Reuse of Deep-Dewatered Sludge Cake

BIOCHEMICAL ENGINEERING JOURNAL（2025）

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Abstract

The high-water content of sludge in wastewater plant will influence the transportation and utilization. In this study, a new method for improving sludge dewatering by pyrite (FeS2) activated persulfate (PMS) combined with layered double hydroxide (LDH) was proposed. After conditioning, the water content (Wc) and specific resistance (SRF) of sludge decreased from 97.12 % and 1.83 x 1013 m/kg to 71.39 % and 1.84 x 1012 m/kg, severally. SEM and particle size analysis showed the system could destroy sludge cells effectively.The mechanism analysis of protein and polysaccharide content, 3D-EEM, FTIR, XPS results showed that FeS2/PMS-LDH combined system was beneficial to break down the sludge extracellular polymer (EPS), transform and accumulate the organic matter into the EPS outer layer, release the bound water. Both free radical and non-free radical play a role in oxidation, and they cooperate to break EPS. The effective phosphate adsorption performance of the biochar adsorbent prepared from dehydrated sludge cake was also investigated. The adsorption behavior of phosphate on biochar from dewatered sludge cake belongs to uniform chemical monolayer adsorption. When T = 298k, PH = 5, the maximum adsorption capacity is 20.255 mg/g. The introduction of LDH is helpful to enhance the sludge dewatering and the adsorption of phosphate. To sum up, the combined conditioning method considers the effectiveness of sludge dewatering and the feasibility of sludge cake disposal and utilization.

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Key words

Waste activated sludge,Sludge dewatering,Persulfate oxidation,Sludge cake biochar,Mg/Al LDH

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【要点】：本研究提出了一种利用黄铁矿激活过硫酸盐结合层状双氢氧化物（LDH）改善污泥脱水性能的新方法，实现了污泥胞内结构的有效破坏及EPS的分解，同时提高了脱水后污泥的生物炭对磷酸盐的吸附能力。

【方法】：通过黄铁矿（FeS2）激活过硫酸盐（PMS）并结合层状双氢氧化物（LDH）处理污泥，分析其氧化机制及对EPS的破坏效果。

【实验】：实验中，经过处理后，污泥的水分含量从97.12%降低到71.39%，特定电阻从1.83 × 10^13 m/kg降低到1.84 × 10^12 m/kg；使用扫描电镜（SEM）、粒度分析、三维荧光光谱（3D-EEM）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）等技术对污泥的EPS进行机制分析，并研究了脱水后污泥生物炭对磷酸盐的吸附性能，结果显示在298K和pH 5的条件下，最大吸附容量为20.255 mg/g。