Rapid removal of bound water from dredged sediments using novel hybrid coagulants

摘要: Abstract Dredging operations produce sediment masses that require chemical conditioning and dewatering before disposing of dredged sediments. Conventional conditioners have difficulty removing the bound water parceled in extracellular polymeric substances (EPS), removal determines ratio rate sedimentation. In this study, conventional FeCl3, Al2(SO4)3, cationic polyacrylamide (CPAM) a new covalently-bound hybrid coagulant (CBHyC) were investigated for sediments laboratory conditions simulated real-world conditions. The content dewatered cakes was 61.4–68.3% conditioned with CPAM, while 52.6% CBHyC. CBHyC achieved setting 66–359% faster than conditioners, decreased specific resistance to filtration (SRF) by 72–86% compared conditioners. best dewaterability due its structure, which consists hydrophobic group long carbon chain hydrophilic groups Fe-O-Si complexes quaternary ammonium. This structure increases electrical neutralization ability bridging effects, allowing formation large dense flocs Moreover, also functioned as surfactant, dissolving EPS (approximately 59.7%), especially proteins 59.9%) humic 25.4%), from into water. result approximately 37.1% transformed free Lastly, exhibited discontinuous porous structure; thus, more likely flow quickly outward interior locations. These results demonstrate potential application high efficiency rapid