Abstract
The waste slurry produced by the dredging of urban rivers needs to be dewatered before being reused sustainably. As a large amount of plant debris accumulates in sediment, humus-like substances become one of main components in waste slurry. In light of the lack of research on the effect of fulvic acid (FA) in waste slurry on flocculation and separation, this paper carried out experimental research, including the effect of FA content on flocculation and filtration, as well as flocculation and filtration experiments of eight different sources of waste slurry. The results show that if only the FA content in the slurry is changed, the effect of FA on flocculation and separation is significant when the FA content is 0~3%, but it is not obvious when the FA content exceeds 3%. The flocculation and filtration results of eight different sources of river-dredged waste slurry are obviously different; the D10 increment can differ by nearly 10 times, and the specific resistance to filtration (SRF) differs by 2 orders of magnitude. However, FA is not a sensitive factor affecting the flocculation results. FA mainly affects the results by affecting the zeta potential of the slurry. Therefore, in the dewatering design of waste slurry, only the zeta potential needs to be considered.
Highlights
In relation to the above problems, this paper uses eight types of natural waste-dredged slurry to carry out flocculation and filtration experiments, and the fulvic acid (FA) content is determined to explore the effect of FA on flocculation and separation
In order to study the effect of FA in the waste slurry of urban rivers on flocculation and separation, eight types of dredged slurry from five rivers were selected as test samples
FA was very sensitive the effect of basically did not affect the specific resistance to filtration (SRF) when the FA content was greater than 3.00%
Summary
There is an urgent need to rapidly dewater the waste slurry to facilitate subsequent product resource utilization, such as brick [1,2], ceramsite [3,4], embankment material [5,6] and foamed concrete [7] In this way, the sustainable recycling process of waste slurry production, treatment and reuse is realized. In relation to the above problems, this paper uses eight types of natural waste-dredged slurry to carry out flocculation and filtration experiments, and the FA content is determined to explore the effect of FA on flocculation and separation. FA is added to the waste slurry to study the effect of the FA content on flocculation and filtration Based on these results, the influence mechanism of FA in the waste-dredged slurry on the results of slurry reduction is analyzed and discussed
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