Effect of different oxidation pre-treatment on the drying characteristics of dredged sediment
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Abstract:
This work investigated the influence of oxidation pretreatment on drying characteristics of dredged sediment, and the oxidants included ozone and Fenton’s reagent. The drying experiment was carried out using an infrared constant temperature drying oven. The results showed that pretreatment with ozone could obviously promote the infrared drying behavior of dredged sediment and its facilitation on water evaporation was gradually strengthened with the rise of temperature, and the maximum drying rate was improved significantly by over 9%~36%. Moreover, the constant drying phase was held for a relatively long time, which was 1.2~1.7 times that of without pretreatment. The rising and falling variation of the drying rate was obvious with the rise of temperature. Fenton’s reagent was applied to treat the sediment resulting in the increase of the drying rate, but it was not obviously useful to water evaporation. The maximum drying rate increased with the increase of dry basis moisture content. Electron microscope scanning results indicated that the sediment particles were distributed evenly after oxidation pretreatment, which was beneficial to evaporation.
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