Excess sludge reduction has been a research hotspot for a long time. Ultrasonic treatment of excess sludge was an efficient and green pretreatment method, and also can be combined with the addition of oxidants. To improve the effect of ultrasound treatment on sludge destruction, hydrogen peroxide (H₂O₂) was added to examine the combined results in the current study. The effects of the ultrasound/hydrogen peroxide system on the release of sludge organic matter during the destruction process were studied. Single-factor experiments were carried out to determine the optimal operating conditions. With the initial pH of 11.0, H₂O₂ concentration of 0.5 mmol/L, initial sludge concentration of 17 g/L, and 15 min ultrasonic treatment, the maximum soluble chemical oxygen demand (ΔSCOD) in the sludge supernatant after destruction was achieved at 3662.78 ± 239.21 mg/L, with a disintegration degree of 28.61 ± 2.14%, sludge reduction rate of 19.47 ± 0.82%, and the change of mixture sludge concentration (ΔMLSS) of 3.31 ± 0.06 g/L. Meanwhile, the release of nitrogen and phosphorus were greatly improved. Under the optimal conditions, the release of total nitrogen (TN), ammonia nitrogen (NH₃-N) and total phosphorus (TP) were 282.30 ± 24.06 mg/L, 25.68 ± 2.09 mg/L, and 105.69 ± 7.84 mg/L, respectively. The current work had provided solid evidence showing the addition of hydrogen peroxide can effectively strengthen the treatment effects of ultrasound on sludge destruction.

中文翻译：

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超声/过氧化氢联合利用对剩余污泥破坏的影响

减少污泥过多一直是研究的热点。超声处理剩余污泥是一种有效的绿色预处理方法，也可以与添加氧化剂结合使用。为了提高超声处理对污泥破坏的效果，在当前研究中添加了过氧化氢（H ₂ O ₂）来检查综合结果。研究了超声/过氧化氢系统对破坏过程中污泥有机物释放的影响。进行单因素实验以确定最佳操作条件。H ₂ O ₂的初始pH为11.0浓度为0.5 mmol / L，初始污泥浓度为17 g / L，并进行15分钟的超声处理，破坏后的污泥上清液中的最大可溶性化学需氧量（ΔSCOD）达到3662.78±239.21 mg / L，并发生崩解污泥浓度为28.61±2.14％，污泥减少率为19.47±0.82％，混合污泥浓度（ΔMLSS）的变化为3.31±0.06 g / L。同时，氮，磷的释放大大改善。在最佳条件下，总氮（TN），氨氮（NH ₃-N）和总磷（TP）分别为282.30±24.06 mg / L，25.68±2.09 mg / L和105.69±7.84 mg / L。当前的工作提供了坚实的证据，表明添加过氧化氢可以有效增强超声波对污泥破坏的处理效果。