Abstract
To further reduce the in-situ sludge from landfill, Fe2+-activated sodium persulfate combined with vacuum preloading was first proposed. Firstly, the effects of optimal Na2S2O8 dosage on the landfill sludge (LS) were investigated by the vacuum filtration experiments. Then, vacuum preloading experiments were conducted on the sludge with different Na2S2O8 dosages to study the water content, water discharge, and settlement. Besides, sludge particle size diversification was carried out by particle size distribution and scanning electron microscopy (SEM) tests. The results were summarized as follows: the specific resistance of filtration (SRF) of LS could be reduced by 98.5% mostly when the Na2S2O8 dosage was 30%; the particle size became significantly smaller, and large particles were converted to small particles; the water content dropped from 86.9 to 58.3%; and the SEM test manifested the oxidation of sodium persulfate caused the destruction of the glial structure of the sludge and the recombination of partial particles.
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Abbreviations
- SRF:
-
Specific resistance of filtration
- EPS:
-
Extracellular polymeric substances
- SEM:
-
Scanning electron microscope
- UCS:
-
Unconfined compressive strength
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Funding
The authors received financial support from the National Natural Science Foundation of China (Grant No. 41772303), the Shanghai Sailing Program (Grant No. 19YF1415500), the National Natural Science Foundation of China (Grant No. 52108327) and the Shanghai Municipal Science and Technology Commission (Grant No. 20DZ2250800).
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Yajun Wu: project administration, resources, writing — review and editing, supervision.
Xingtao Zhang: investigation, data curation, formal analysis, writing — original draft.
Xudong Zhang: conceptualization, data curation, formal analysis, writing — original draft, supervision.
Haiqiang Zhang: conceptualization, data curation, writing — review and editing.
Yaoyi Wang: conceptualization, investigation, writing — review and editing.
Peng Ye: conceptualization, data curation, writing — review and editing.
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Wu, Y., Zhang, X., Zhang, X. et al. Insights into vacuum preloading consolidation of landfill sludge based on Fe2+-activated sodium persulfate. Environ Sci Pollut Res 29, 35964–35976 (2022). https://doi.org/10.1007/s11356-022-18657-6
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DOI: https://doi.org/10.1007/s11356-022-18657-6