Dredge Dewatering Bags
1. Efficient Dehydration and Drying: The pores of the special fabric quickly separate mud and water, allowing muddy wastewater to be dehydrated in 3-7 days, reducing the sludge moisture content to below 60%, significantly shortening desilting operations.
2. Environmentally Friendly and No Secondary Pollution: Pure physical filtration eliminates the need for chemical additions, preventing soil and water contamination. Dried sludge can be reused as a resource (such as soil improvement), reducing the burden on solid waste disposal.
3. Durable and Adaptable: The high-strength material is wear-resistant and stretch-resistant, allowing full sludge to be stacked 3-5 times without breaking. Available in a variety of sizes, it meets the needs of different desilting applications, including rivers, lakes, and mines.
4. Cost-Effective and Convenient: The initial investment is 50% lower than dewatering equipment, and the sludge can be reused 2-3 times. No complex installation is required; simply connect to a slurry pump for operation, reducing labor and transportation costs.
Products Introduction：
Dredge Dewatering Bags are functional geotextiles designed specifically for mud-water separation in dredging operations. Made from high-strength polypropylene (PP) or polyester (PET) geotextiles, they are precision-sewn into a bag-like structure. Some models feature UV- and corrosion-resistant coatings for enhanced durability. Their core principle is to utilize the fabric's water-permeable, mud-impermeable properties. The high-moisture mud-water mixture (typically over 90%) generated during dredging operations is pumped into the bag. The water seeps out naturally or is expelled under pressure through the bag's pores, trapping solid particles such as silt and gradually drying them, ultimately achieving mud-water separation and sludge reduction. This product requires no complex equipment and is easy to operate. It is suitable for dredging operations in various locations, including rivers, lakes, ports, and mines. It can significantly reduce sludge transportation and disposal costs, making it a key component of environmentally friendly dredging projects.
Product Features：
1. Efficient Dehydration and Shortened Construction Time: The bag fabric utilizes a special weaving process, with a precisely controlled pore size of 0.1-0.5mm. This effectively retains solid particles in dredged mud (with an interception rate exceeding 95%) while ensuring rapid water penetration. Under normal operating conditions, one cubic meter of dredged mud can be dehydrated in 3-7 days, reducing the sludge moisture content to below 60%. Compared to traditional natural drying (which takes 20-30 days), this dehydration efficiency is 3-5 times higher, significantly shortening the overall dredging project schedule.
2. Strong and Durable, Suitable for Complex Environments: The bag utilizes geotextiles with a breaking strength of ≥20kN/m. The bag seams are double-stitched and heat-sealed for excellent tear and stretch resistance. When fully filled with mud (a single bag can hold 1-20 cubic meters), it can withstand its own weight and the pressure of 3-5 stacked layers, preventing rupture or leakage. It is also acid- and alkali-resistant and age-resistant, suitable for use in dredged mud containing heavy metals and chemical residues. It has an outdoor service life of 1-3 years and can be reused 2-3 times.
3. Environmentally friendly and recyclable: The mud-water separation process relies entirely on physical filtration, eliminating the need for chemical agents such as flocculants and dehydrators, thus preventing chemical residues from contaminating soil and water. After dehydration, the dried mud can be reused according to its composition—for example, as farmland soil improvement, construction fill, and ecological restoration. This reduces the amount of solid waste landfilled, aligns with the "green dredging" concept, and minimizes secondary impacts on the ecological environment.
4. Flexible and easy to use, cost-effective: The lightweight design (empty bag weighs 1-5kg) and foldable storage make it easy to transport and deploy on-site. Equipped with a dedicated feed port and exhaust valve, it can be connected to a dredged mud pump for immediate operation, eliminating the need for specialized technicians. Available in a variety of sizes (1m×1m to 5m×10m), they can be flexibly selected based on the volume of dredging work. The initial investment cost is over 50% lower than dewatering equipment such as plate and frame filter presses and centrifuges, and with no electricity consumption, they offer greater economical long-term use.
Product Parameters：
project | unit | CWGD50S | CWGD90/120 | CWGD90S | CWGD100S | CWGD120S-B | CWGD120S-C | CWGD130S | CWGD200S-C | |
Tensile strength-radial | kN/m | 55 | 90 | 90 | 100 | 130 | 130 | 130 | 220 | |
Tensile strength-Weft | 50 | 120 | 90 | 100 | 120 | 120 | 130 | 210 | ||
Strain elongation-radial | % | 16±1 | 12±1 | 9±1 | 10±1 | 10±1 | 10±1 | 10±1 | 12±1 | |
Extensional elongation-Weft | 10±1 | 8±1 | 8±1 | 8±1 | 8±1 | 8±1 | 8±1 | 8±1 | ||
Breakage strength at 2% elongation | warp direction | kN/m | 5/15 | 14/40 | 30/30 | 30/30 | 20/40 | 22/40 | 20/45 | 15 |
Breakage strength at 5% elongation | warp direction | kN/m | 14/33 | 38/90 | 75/75 | 75/75 | 80/100 | 84/40 | 80/110 | 90 |
mass area ratio | g/m² | 285 | 440 | 390 | 430 | 540 | 540 | 560 | 850 | |
Joint tensile strength | kN/m | 35 | 90 | 60 | 70 | 100 | 100 | 110 | 170 | |
Static Burst Strength (CBR) | KN | 5 | 10 | 10 | 13 | 15 | 15 | 16 | 22 | |
Dynamic perforation | mm | 10 | 8 | 12 | 12 | 10 | 10 | 11 | 8 | |
Equivalent aperture (0g0) | mm | 0.9 | 0.48 | 0.52 | 0.45 | 0.4 | 0.3 | 0.43 | 0.4 | |
Permeability (Q50) | L/m²/s | 200 | 40 | 20 | 15 | 12 | 6.5 | 15 | 15 | |
Ultraviolet resistance (500h strong storage rate ） | % | 90 | 90 | 85 | 85 | 85 | 85 | 85 | 85 | |
Product Applications：
1. River and Lake Dredging: During dredging operations in urban rivers, scenic lakes, and reservoirs, the mud-water mixture dredged by the dredging vessel is pumped directly into dewatering bags to quickly separate the water from the silt. The clear water that seeps out is then simply filtered and returned to the water body, while the dried silt is loaded onto trucks for disposal or resource utilization. This prevents the spread of dredged mud and water from polluting surrounding waters, making it suitable for the management of ecologically sensitive water bodies.
2. Port and Waterway Dredging: During maintenance dredging at ports, docks, and waterways, dewatering bags are used to dewater dredged mud with high sand content onshore or in temporary storage areas, reducing pollution to waterways and port waters caused by mud transportation. The dried mud can also be used for waterway embankment reinforcement or land reclamation, achieving resource recycling.
3. Mine and Quarry Tailings Treatment: Tailings slurry generated by metal and non-metallic mining, as well as quarry washing wastewater, is dehydrated and dried using dewatering bags. This reduces the footprint of tailings reservoirs and mitigates the risk of landslides and leakage. It also prevents harmful substances in the tailings from spreading with rainwater, protects the soil and groundwater environment around mines, and contributes to mine ecological restoration.
4. Construction Dredging: Construction slurry (including silt and construction waste) generated during construction pit excavation, tunnel shield construction, and roadbed desilting is treated with dewatering bags. The dried slurry can be transported for disposal or used as backfill. Once the seepage water content meets standards, it can be recycled for construction or discharged. This solves the problems of difficult transportation and expensive disposal of construction slurry and reduces the impact of construction on the surrounding environment.
Dredge Dewatering Bags, with their core advantages of efficient dewatering, durability, environmentally friendly recycling, and economical convenience, precisely address the pain points of dredging projects: low mud-water separation efficiency, high risk of secondary pollution, and high costs. Whether for ecological dredging of rivers and lakes, industrial dredging of ports and mines, or mud treatment in construction projects, they achieve rapid mud-water separation through physical filtration, shortening construction timelines, reducing costs, and minimizing environmental disruption. As an environmentally friendly dredging equipment, this product balances functionality and sustainability, offering efficient solutions for various dredging projects without complex operations or high investment. It is an ideal choice for promoting the "green, cost-effective, and resource-efficient" nature of dredging projects.
