Abstract In view of the deep dewatering of landfill sludge (LS) that had been buried for more than ten years in Shanghai, Fenton's reagent combined with a vacuum preloading method was proposed. First, a vacuum filtration test was carried out to study the optimal amount of Fenton's reagent for LS. Then, four filter membranes with different pore sizes were used for a vacuum preloading model box test to study the influence of pore size on the consolidation behaviour of LS. Through particle analysis, SEM and MIP testing, the consolidation behaviour of sludge under different pore sizes was studied from the microscopic perspective. The results show the following: the optimal amount of Fenton's reagent for conditioning LS is Fe2+ 4%, H2O2 12%; the water content of LS with different pore sizes is reduced from 73% to 56%–63%; the unconfined compressive strength is increased from 10 kPa to above 80 kPa; and the volume reduction ratio is approximately 50%, among which the filter pore size of 180-μm has the best performance. The micro-test results show that the pore size of the filter membrane has an important influence on LS's consolidation. The research results can provide significant references for the in-situ treatment of LS.

中文翻译：

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不同过滤孔径下Fenton试剂调理垃圾填埋污泥真空预压固结实验研究

摘要 针对上海埋藏十余年的垃圾填埋污泥（LS）深度脱水问题，提出了芬顿试剂结合真空预装法。首先，进行了真空过滤试验以研究用于 LS 的 Fenton 试剂的最佳用量。然后，采用四种不同孔径的滤膜进行真空预压模箱试验，研究孔径对LS固结行为的影响。通过颗粒分析、SEM和MIP测试，从微观角度研究了不同孔径下污泥的固结行为。结果表明：调节LS的Fenton试剂的最佳用量为Fe2+ 4%，H2O2 12%；不同孔径的LS含水量从73%降低到56%~63%；无侧限抗压强度由10kPa提高到80kPa以上；体积减少率约为50%，其中过滤孔径为180-μm的性能最好。微量试验结果表明，滤膜孔径对LS的固结有重要影响。研究结果可为LS的原位处理提供重要参考。