FeSO₄ was used to activate K₂S₂O₈ mixed with paper sludge to condition activated sludge, and its effect on sludge dewaterability was investigated. Interaction effects of various parameters on sludge dewaterability were investigated and analysed by considering the moisture content of cake, specific resistance to filtration (SRF) and capillary suction time (CST) as indicators and the Box–Behnken design of response surface methodology (RSM). Results indicated that the moisture content of cake, SRF and CST decreased from 74.52 to 69.57%, 25.39 × 10¹² to 11.80 × 10¹² m/kg and 199.8 to 146.4 s, respectively, under optimal conditions. RSM results presented that only 0.13% of the response values cannot be interpreted with this model, and the three‐factor interaction was observed to be significant. Additionally, sludge dewaterability mechanism observed that K₂S₂O₈ mixed with paper sludge used the strong oxidising properties of SO₄⁻• to crack sludge flocs. Fine fibres and calcium carbonate in the paper sludge played important roles as the skeleton support in the sludge filtration process, and the internal moisture was rapidly eliminated.

中文翻译：

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过硫酸盐与纸浆混合对活性污泥脱水性的影响

用FeSO ₄活化纸浆污泥中的K ₂ S ₂ O ₈来调节活性污泥，并研究其对污泥脱水性能的影响。通过考虑滤饼的水分含量，过滤比抗性（SRF）和毛细抽吸时间（CST）作为指标以及响应面方法的Box-Behnken设计（RSM），研究和分析了各种参数对污泥脱水性的相互作用。结果表明，蛋糕，SRF和CST的水分含量从74.52降至69.57％，从25.39×10 ¹²降至11.80×10 ¹² 在最佳条件下，分别为m / kg和199.8至146.4 s。RSM结果表明，该模型无法解释只有0.13％的响应值，并且三因素相互作用是显着的。此外，污泥脱水机制观察到ķ ₂小号₂ ö ₈与造纸污泥混合使用的SO的强氧化性能₄ ^- •破解污泥絮体。纸污泥中的细纤维和碳酸钙在污泥过滤过程中起着骨架支撑的作用，并且内部水分被迅速消除。