Background and Aim <p>A seabed mineral collection device should collect material efficiently while minimizing environmental disturbance. Although the hydraulic collection based on the Coandă effect has been assessed based on deep-sea in-situ experiments, the extent of sediment disturbance remains unclear, preventing assessment of its environmental impact. This study analyzes sediment erosion characteristics caused by key parameters of the Coandă effect collection.</p> Methods <p>An indoor tank was used to examine sediment disturbance under various Coandă effect parameters. Experimental data were used to construct a predictive model for sediment disturbance depth and volume. The impact on benthic organisms was quantified based on the community characteristics in the Western Pacific polymetallic nodule mining area.</p> Results <p>The study found that erosion depth and volume were positively correlated with jet velocity and angle, negatively correlated with height above the seabed and travel speed, and showed a non-linear relationship with suction velocity, initially decreasing and then increasing. Benthic organisms in the Western Pacific mining area are primarily distributed in the top 0 ~ 3&#xa0;cm of sediment. When the erosion depth of the Coandă effect collection device reached 5&#xa0;cm, small benthic organism abundance and large benthic organism abundance were 26.210 ind.·10 cm⁻² and 12.23 ind.·cm⁻², respectively.</p> Conclusion <p>The results suggest that the Coandă effect collection method significantly impacts benthic organisms, particularly at greater erosion depths. Based on these findings, a new deep-sea polymetallic nodule rotating rake collection method is proposed, which could serve as a more environmentally friendly alternative for future commercial mining operations.</p>