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- W3209789096 abstract "This study compared the three wastewater pretreatments of ozonation, Fe2+-S2O82- and freeze-thawing (F/T) in the disintegration, anaerobic digestion (AD) and final disposal of the sludge. The F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8% and 47.1%, respectively. The ozonation pretreatment formed more volatile fatty acids (VFAs), with a peak value of 320.82 mg SCOD/L and controlled the release of sulfides. The Fe2+-S2O82- pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed in-situ. During the anaerobic digestion of the sludge, the ozonation pretreatment accelerated the hydrolysis rate (k) rather than the biochemical methane potential (B0) of the sludge due to the high VFA content in the supernatant. Comparatively, the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the sludge. Although Fe2+-S2O82- pretreatment decreased the methane production, the ferric particle was a unique advantage in the disintegration and harmless disposal of the sludge. The digested sludge had more VFAs after ozonation pretreatment, which contributed to the recycling of carbon. In addition, the lower sludge volume could save the expense of transportation and disposal by ozonation pretreatment. Different pretreatments had different characteristics. The comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge." @default.
- W3209789096 created "2021-11-08" @default.
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- W3209789096 date "2021-10-01" @default.
- W3209789096 modified "2023-10-14" @default.
- W3209789096 title "Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness" @default.
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- W3209789096 doi "https://doi.org/10.1016/j.ese.2021.100132" @default.
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