However, it is unknown whether the same coagulation–flocculation scheme has a universal effect on dredged slurries from different sources. Lots of existing research focused on the selection of flocculants to improve the separation of local dredged slurries. Among these additives, FeCl 3 or anionic polyacrylamide (PAM) was more effective in the separation of the slurry. (2019) studied the sedimentation of six types of coagulants or flocculants on the dredged slurry from WenRuitang river. It was found that cationic polymers have better performance for the Golden Horn dredged slurry than anionic polymers. For example, Berilgen & Bulut (2016) studied the dewatering effects of four types of polymers on the Golden Horn dredged slurry.

2018), which is originally used in water treatment and sludge treatment. Recently, the coagulation–flocculation method has been successfully used in engineering to accelerate the soil-water separation efficiency of the dredged slurry ( Berilgen & Bulut 2016 Bhatia 2017 Wang et al. Rapid dewatering of the dredged slurry is a hot issue. When these constituents are incorporated, the zeta potential exhibited in the slurry determines the difference in flocculation and separation effects.Ī large amount of dredged slurry with high water content is produced in dredging projects every year ( Koerner et al.

However, there is no single constituent in the dredged slurry which dominates the flocculation and separation effect. It was found that the main constituents in the dredged slurries, such as clay minerals, fulvic acid and humic acid, impact on flocculation and separation effects by affecting the zeta potential of the particles.

Under the same flocculation conditions, the difference in the increment of particle size d 10, the specific resistance of filtration, and the suspended solids (SS) of the supernatant after sedimentation are 0–4.6 times, 0–2.4 orders of magnitude, and 0–4 orders of magnitude, respectively. Facing these problems, the tests were conducted for dredged sediments from 10 different sources, including rivers, lake, and ocean. It is unclear whether there is a significant difference in flocculation and separation of dredged slurries from different sources and which constituents dominate this process. The coagulation–flocculation method can improve the efficiency of separation, and a suitable scheme is of great significance.

In the water treatment process of natural water bodies, a large amount of dredged slurry with high water content is generated and required for treatment.

Define dredged