Study on the anti-diffusion performance of environmentally-friendly anti-diffusion agents in the cutter-suction process
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Abstract:
In order to solve the pr oblem of sediment diffusion in dr edg ing pr ojects, we desig ned a cutter suctio n ex periment de2 v ice. The diffusion dist ribution o f sediment was pr edicted by CFD model. CPAM, PSF and CPAM/ PSF w ere added during the cutter suctio n pro cess. We explo red the anti- diffusion effect of anti2diffusion ag ents in cutter suctio n process in terms of the sediment set tling rate, tur bidity o f overly ing w ater, COD, particle size, and SEM mo rpholog y chang es. T he results show ed t hat CPAM had the best effect on preventing sediment diffusio n. When CPAM dosage w as 15 mg/ L, 95% of the mud sam ples basi2 cally sett led in an instant relative to the final sediment settling rat e; after 1 ho ur of sett ling , the turbidity o f the ov erlying w ater reached the low est value o f 101 23 NTU and COD reached the lowest value o f 121 0 mg/ L, w hich w ere respect ively 831 6% and 891 1% low er t han t he turbidity and COD of t he overly ing wat er w itho ut anti2diffusion ag ent. Fr om the SEM pictures o f the sed2 iment samples, it can be seen that t he sediment particle size increased the most obvio usly, with the median particle size reaching 191 250 Lm. which w as 117% higher than that of the sediment w ithout the anti2diffusion agent. T he ag ent showed go od effects in pr event ing the spr ead o f sediment.
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