期刊
ENVIRONMENTAL RESEARCH
卷 214, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2022.114161
关键词
Improved freeze -thaw vacuum preloading; Temperature spatial and temporal distribution; characteristics; Dewatering and reduction; In -situ vane shearing strength
资金
- National Natural Science Foundation of China [41772303]
- Shanghai Sailing Program [19YF1415500]
- Shanghai Municipal Science and Technology Com- mission [20DZ2250800]
This study improves the freeze-thaw vacuum method for sludge treatment by analyzing the spatio-temporal distribution relationship through numerical fitting of temperature change. The results show that the alternating freeze-thaw vacuum procedure substantially enhances dewatering and reduction of sludge, as well as improves its mechanical properties.
The freeze-thaw vacuum method for conditioning pretreated sludge has been proved that it not only has greater dewatering efficiency but also is more ecologically friendly. In this paper, the experiment is improved to address shortcomings in previous freeze-thaw vacuum approach for sludge treatment. The spatio-temporal distribution relationship of distance-time-temperature is developed and divided into two stages by numerically fitting the temperature change of freezing tubes in the sludge. It is expected to guide the time control of large-scale frozen sludge in practical engineering applications to achieve optimal dewatering treatment. Furthermore, the per-formance of dehydration after the model test is evaluated on multi-scale: settlement and mechanical properties (macroscopic perspective), mean particle size (mesoscopic perspective), and SEM microstructure (microscopic perspective). The results reveal that the improved sludge treatment method of alternating freeze-thaw vacuum procedures, using both prefabricated horizontal drains (PHDs) and prefabricated vertical drains (PVDs), sub-stantially benefits the sludge dewatering and reduction. This method results in an unparalleled volume reduction of 63.51% and a water content reduction to 58.54%. Moreover, in-situ vane shearing strength of the sludge obtained from the improved test meets the strength requirement for the landfill final cover soil, demonstrating that the method is superior in improving mechanical properties.
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