期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 402, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124173
关键词
Dewatering; Floated oily sludge; Hydrothermal treatment; Mechanical compression in-situ
资金
- Key Program for China EU International Cooperation in Science and Technology Innovation [2018YFE0117300]
- Shaanxi Provincial Natural Science Foundation Research Program-Shaanxi Coal Joint Funding [2019JLZ-12]
In this study, a method combining hydrothermal treatment and in-situ mechanical compression was proposed for the dewatering of floated oily sludge, with experiments confirming its effectiveness.
Due to the high moisture content of the oily sludge, the conventional use of oily sludge treatment presents poor feasibility in industrial applications. Hence, finding an efficient and energy-saving technology is still an urgent need for the dewatering of oily sludge. In this paper, an innovative method combining hydrothermal treatment (HT) and in-situ mechanical compression (MC) for dewatering of floated oily sludge (FOS) was proposed. Series of experiments on HT&MC were conducted to verify the method. 77-96 wt% of water can directly be separated from FOS by the HT&MC treatment under the temperature of 120-240 degrees C and residence times of 10-60 min. The bound water content in raw and HT&MT treated FOS were measured by employing the differential scanning calorimetry (DSC) to evaluate the dewatering ability. The result of DSC illustrates the freezing peaks shifted from-11.1 degrees C to-21.2 degrees C as the diameter of water droplets reduced. Meanwhile, the comprehensive characterization analysis of products, including chemical oxygen demand (COD), NH4(+)-N, and gas chromatograph (GC) were conducted. All results indicated that HT&MC is advisable for dewatering of oily sludge.
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