Environmental Dredging VS. Reclamation Dredging

2026-03-13 15:09:50     Category：Technical Resources     Browse number：991     Release time：2026-03-13 15:09:50

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Environmental Dredging and Reclamation Dredging  

I. Environmental Dredging: Core Technology for Ecologically Priority and Precise Governance

1. Core Vessel Selection for Environmental Dredging

• Small-sized environmental protection CSD (80-800 m³/h) : Such as Yanyang Marine 500 m³/h modular environmental protection cutter suction dredger. Suitable for dredging inland rivers and urban lakes, it is equipped with a low-disturbance cutter head and sludge filtration system to avoid sediment diffusion. The operational noise is ≤70 dB, meeting the construction standards of ecological protection zones. Alternatively, the 8 m³ grab dredger + 1200 m³ split hopper barge is easy to use and flexible, capable of transporting dredged sediment directly without laying pipelines.

• Medium-sized environmental protection CSD (1000-3500 m³/h) : Such as Damen CSD500 ecological dredger. Equipped with an intelligent concentration monitoring system and pollutant separation device, it can simultaneously complete dredging, decontamination, and sludge-water separation. Suitable for cleaning polluted sediment in coastal waters and large lakes, the solids content is controlled within 60%, and the sludge harmless treatment rate reaches 95%.

• Large-sized environmental protection CSD (3500-8000 m³/h) : Such as Royal IHC Beaver environmental protection dual-fuel CSD and CCCC "Jun Lan" fully electric-driven environmental protection dredger. Adopting LNG/methanol dual-fuel or full electric power, it reduces emissions by 30%-60%. Equipped with high-efficiency sludge-water separation equipment and ecological monitoring modules, it is suitable for large-scale environmental dredging projects in bays and estuaries, with a dredging depth of up to 35 m and a discharge distance exceeding 5 km.
  
  

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2. Key Requirements for Environmental Dredging Projects and Vessel Adaptation

• Anti-diffusion requirement : Vessels must be equipped with pollution prevention curtains, low-disturbance cutter heads, and closed sludge transport pipelines. For example, the cutter head speed of environmental protection CSD can be intelligently adjusted (0-30 r/min) to reduce the suspension and diffusion of sediment and protect aquatic habitats.

• Precision control : Relying on GPS positioning and sonar detection systems. For example, the positioning accuracy of Yanyang Marine intelligent environmental protection CSD is ±0.5 m, which can accurately remove polluted sediment and retain the surface benign sediment.

• Sludge treatment : Vessels must integrate filter presses, sedimentation tanks, and other equipment. For example, Yanyang Marine 3500 m³/h environmental protection dredger can dehydrate and solidify sludge on-site, discharge treated water up to standard, and use the sludge cake for ecological backfilling or harmless disposal.

3. Typical Engineering Cases of Environmental Dredging

• Urban Lake Ecological Restoration Project : Yanyang Marine 650 environmental protection cutter suction dredger was adopted, paired with pollution prevention curtains, to remove 120,000 m³ of polluted sediment. The vessel monitored water quality throughout the operation, and indicators such as COD and ammonia nitrogen were normal. After the project, the lake water quality improved from Grade V to Grade III, and the coverage rate of aquatic plants recovered to 85%.

• Coastal Water Pollution Control Project : Royal IHC Beaver LNG dual-fuel environmental protection CSD was used to dredge an area of 5 km² with a dredging depth of 10-15 m. The vessel reduced emissions by 40%, and the pollutant removal rate of sediment reached 90% after on-board separation treatment. The marine ecosystem recovered stably within one year.

II. Reclamation Dredging: Key Means for Space Expansion and Engineering Foundation Laying

1. Core Vessel Selection for Reclamation Dredging

• Cutter Suction Reclamation Dredger (CSD series) : Yanyang Marine 8000 m³/h self-propelled cutter suction reclamation dredger, with a dredging depth of 1-35 m, output of 8000 m³/h, and a sludge transport distance of up to 8-12 km. Equipped with large-scale reclamation pipelines, it is suitable for large-scale land reclamation and port reclamation projects.

• Self-Propelled Trailing Suction Hopper Dredger (TSHD) : Such as CCCC "Tian Kun Hao" self-propelled trailing suction hopper reclamation dredger and Damen trailing suction hopper dredger. It has strong self-propelled capability and can collect sediment from long distances (voyage exceeding 100 km) with a hopper capacity of 5000-30000 m³. Suitable for open-sea reclamation and integrated waterway dredging and reclamation projects, the reclamation efficiency reaches 2000-5000 m³/h.

• Yanyang Marine also provides large-scale TSHDs with hopper capacities ranging from 8000 to 26800 m³, featuring bow discharge (i.e., shore discharge) functions.

2. Key Requirements for Reclamation Dredging Projects and Vessel Adaptation

• Capacity adaptation : Select the vessel flow rate according to the reclamation project volume. For example, large-scale land reclamation projects prioritize 8000 m³/h class large cutter suction reclamation dredgers (such as Yanyang Marine 8000 m³/h CSD), while small depression reconstruction can use 1000-3500 m³/h medium-sized vessels (such as Yanyang Marine 3500 m³/h series).

• Sludge transport efficiency : Vessels must be equipped with high-pressure pumps and wear-resistant pipelines to reduce pipeline loss and improve sludge transport efficiency by 30%. The in-hopper mixing system of self-propelled trailing suction hopper ships can prevent sediment deposition and ensure uniform reclamation.

• Sediment adaptation : For complex geology such as hard soil and rock, select reclamation dredgers with cutter heads (such as Royal IHC Beaver CSD); for soft silt, select trailing suction hopper reclamation ships to avoid sediment loss during excavation.

3. Typical Engineering Cases of Reclamation Dredging

• Port Expansion Reclamation Project : Yanyang Marine 8000 m³/h self-propelled cutter suction reclamation dredger was adopted to excavate 20 million m³ of sediment from coastal waters, forming 10 km² of land. The continuous operation efficiency of the vessel reached 90%, the sludge transport distance was 5 km, and the bearing capacity of the reclaimed foundation met the requirements of port yard construction.

III. Core Differences Between Environmental Dredging and Reclamation Dredging & Comparison of Vessel Selection

IV. Industry Development Trends: Greenization, Large-Scale, and Intelligence

• Greenization upgrade : Environmental protection dredging vessels gradually adopt full electric drive (such as CCCC "Jun Lan") and LNG dual-fuel power (such as Royal IHC "Spartacus"), reducing emissions by 30%-60%. At the same time, they integrate sludge harmless treatment systems to meet strict environmental standards.

• Large-scale adaptation : Reclamation dredging vessels are developing towards high flow rate and long transport distance. For example, Yanyang Marine 8000 m³/h self-propelled reclamation dredger is suitable for large-scale land reclamation and super port construction needs.

• Intelligence empowerment : Mainstream vessels are equipped with AI intelligent control systems (such as Yanyang Marine intelligent CSD), which can automatically adjust cutter head speed and pump flow rate. Combined with GPS and sonar positioning, it realizes precise dredging and reclamation, improving operational efficiency by 15%-20%.

V. Conclusion

As important supports for infrastructure construction and ecological protection, the engineering quality and efficiency of environmental dredging and reclamation dredging directly depend on the scientific nature of vessel selection. Whether selecting environmental protection cutter suction dredgers (CSD series) for polluted water restoration or high-power reclamation dredgers for land reclamation, it is necessary to accurately adapt to project goals, geological conditions, and environmental requirements.
Yanyang Marine can provide various types of vessels such as CSD, TSHD, and Grab Dredger + Split Hopper Barge to meet the needs of various projects.