Southern Dredging & Marine, Inc.

- Environmental Geotextile Tubes & Bags

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Dredging & Marine's Geotextile Tubes and Bags are used for marine environmental applications such as maximum solids recovery. They can dewater millions of gallons of sludge faster than older methods. Geotextile tubes are a price effective solution commercial for removing sludge from marinas, coastal waterways, lakes, rivers, and lagoons. Using geotextile tubes is the economical and efficient solution to removing sludge and dewatering projects. Southern Dredging & Marine offers Geotextile Tubes and Bags throughout Florida, the Caribbean including the Cayman Islands, Dominican Republic, Virgin Islands, Haiti, Bahamas, St. Lucia, Aruba and Antigua as well as Central America such as Belize, Costa Rica, Guatemala and Honduras and South America.

Geotextile tubes are created from high-strength woven fabric. They effectively remove solids for little cost and have become popular all over the world, using environmentally safe polymers. Excavated sludge can be used for beaches, landfills and creating new land mass. The Geotextile Bags and Tubes are filled through a port hydraulically, solidified with polymers and over a period of time they naturally dewater. Once the water has been removed, the sludge has become solid and can be used for beaches or other new land mass.

These environmentally friendly sand-colored geotextile tubes and bags are weather and UV resistant and blend naturally with the environment.  Customers can dictate the size of the bags needed and can be fitted into a certain area or stacked up to take up less room.  Our GeoTextile Tubes and bags are a very high quality.  We have great customer service, we have been told,  and strict attention to meeting deadlines. Southern Dredging & Marine Geotextile Tubes come in a neutral sand color, and the woven fabric is rip-resistant to minimizes any possible damage from storms, animal attacks or vandalism.

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Southern Dredging Geotextile Tubes can be filled hydrualically using a cutterhead dredge during a dredging project. The spoils from dewatering is sludge that is ported into the geotextile tubes, then the dewatering process can take place, using polymers to harden the sludge and cause the water to seep out of the porous woven fabric over time, thus dewatering the sludge. During the dewatering process, the bags volumes continually reduces allowing more of the spoils to be pumped into the Geotextile Tubes. After the bags or tubes have fully dewatered, they can be cut open and the material removed to be used in the creation of new land, beaches, landfills or other applications.

By using Southern Dredging GeoTextile Tubes, projects can save a huge amount of upfront capital investment. Geotextile tubes and bags also take up less room and can be stacked up, even in a very small area, thus creating even more savings to the client. Contact us toll-free for a free quote at 877-949-7999. We can customize the geotextile tubes to fit the size you need. Southern Dredging & Marine's Geotextile product is uperior to any competitor product and very cost effective.

Dredging is evolving into a more environmentally friendly industry with the advent of GeoTextile Tubes and Bags as a means of capturing and containing the spoils from dredging. In the past, the only means of containing the sand, silt and spoils from the process of hydraulic or mechanical dredging was to either pump the material into a pre-built hole in the ground called a 'cell' or pump into movable containers such as a barge, dump truck, or other item. Today, there are choices that include the GeoTextile Tubes and Bags, and there are many advantages as well as a few inconveniences.

The first advantage of using GeoTextile Tubes is for reuse of the spoils after the GeoTextile bag or tube has dewatered. If sand has been dredged and pumped into the tube, then once the water has drained and evaporated, what is left is gorgeous sand ready to be reused for beach reclamation and refurbishing as well as new land reclamation. Silt can also be used after dewatering for creating or repairing land.

The second advantage of using GeoTextile Tubes or Bags is the fact that the dredging creates very little turbidity and disruption of the marine environment. The disturbed material is pumped directly into the bags rather than being thrown back into water or a cell. This is big!  The environment is left intact with very little damage.

The only real disadvantage to using GeoTextile Tubes or Bags is the difficulty of the task is greater than just dumping the spoils into a hole or back into the water. It requires more man power, lots of stops and starts to realign the discharge pipes, and is much slower going. Dredging times will slow down and take a longer period of time to complete.

Property owners should weigh the pros and cons before making the final decision. There are many instances where using GeoTextile Tubes and Bags would not be required, but when environmental concerns are an issue, or turbidity issues, the answer is simple. And as the use of GeoTextile Tubes and Bags becomes more popular, Environmental Agencies will be more insistent upon their use. It helps retain the beauty of the environment and the impact on the environment is minimal compared to older techniques. It is less apt to distribute toxins. Reservoirs are a prime target and should only consider their use to keep the turbidity at a minimum.

Southern Dredging and Marine can provide you with GeoTextile Tubes and Bags for your next project. Our services include the installation of the bags to receive the spoils from dredging, or to be used for erosion control or shoreline protection. Contact us to learn more.

Deploying & Connecting the Tubes or Bags

After installing the drainage media, measure the width of the dewatering cell and mark the location of the center of each tube unit. Position the first unit such that the center of the roll is centered at the designated mark. Unroll the tube from the core. The ports shall be on the center line and the tube will be unfolded from the center.  

After placing, the tubes should be anchored for initial filling by means of the side loops on the tube.  Anchor stress must be alleviated after tube begins to fill.  If needed, sandbags may be used to keep tube from being blown out of position.  

Size the discharge lines coming from a dredge or pump so that the flow inside of the line is at a speed to keep the pipe full and prevent settlement of solids.  Lay the lines straight whenever possible and minimize the amount of elbows and T's to prevent clogging inside the discharge line.  Connections should be equal to the diameter of the discharge line.  The pressure in the discharge line should not exceed 6 psi when the flow is going into the one or multiple dewatering units.  The warning tag on each tube refers to the maximum allowable gallons per minute to that tube. 

For dewatering applications with low percentages of sand,  adding polymers will help increase dewatering, improve effluent quality, and achieve higher percentage solids in the dewatered sludge.  Polymer selection, dosing, and mixing operations shall be optimized by the POLYMER SUPPLIER  with bench scale tests as part of the planning process.   

For projects with multiple dewatering tubes, a manifold system may be used to distribute the sludge to fill one unit at a time or multiple units at a time.  The manifold should be constructed using either  “T’s” or “Y’s” fittings and valves. Pinching valves on a flexible line between the fitting at the manifold and the line connected to the fill port is installed to control the filling of one or multiple tubes at a time. As one unit is filled, the pinch valve for the next geotextile tube can be opened and the pinch valve for the first tube can be closed completely, or partially closed to maintain a flow into this unit that balances the inflow to the dewatering rate of the unit. 

Create a start up and daily checklist to follow throughout the operation, before the starting the project.  Check for leaks in the piping and connections.  Verify the working condition of the pumping system, the polymer mixing system, and the injection system for acceptable performance.  Inspect the site to insure that there are no abnormal situations and that all safety precautions are in place to avoid accidents.  Put the equipment into operation once everything is working as planned.

Stacking the Containers for a Smaller Footprint

Stacking the dewatering tubes in layers may be necessary on projects with large volumes with a limited footprint for the dewatering cell.

Fill and dewater completely the lower layer of geotextile tube units to support the next layer and all subsequent layers.  All units on a supporting layer must be dewatered to the same level.  

If the 'V-Notch' or void space between each unit is large, such as for large  circumference tubes, this space shall be filled with suitable material, such as hay bales, to level  the surface before the next layer of tubes can be placed or “nested”, and to prevent the next layer from collapsing into the space between the lower geotextile tubes. 

Each subsequent layer must be centered directly over the 'V-Notch' of the lower layer of containers. Each subsequent layer shall be a minimum of 10 shorter than the lower layer and centered on the lower layer, so that each end is positioned  a minimum of 5 feet in from the ends of the lower layer.   The top tube shall be anchored from both sizes by means of the side loops in order to maintain position during initial  filling.  The anchor stress must be removed after filling process begins and tube rises.   When filling each layer, any individual tube must not exceed the recommended filling  height.  The maximum height must be measured from the lowest point of a geotextile tube to the maximum upper   surface of the unit. We operate in the Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida and most of Central America.

The geotextile dewatering tube must meet or exceed those requirements shown in the table below. It shall be composed of high-tenacity polypropylene (PP) yarns, which are woven into a network in such a manner that the yarns retain their relative position to each other for the high demands required in geotextile tube applications in the Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida and most of Central America and South America.

Receiving & Storing GeoTextile Tubes or Bags

All dewatering geotextile tubes come packaged in heavy plastic and are clearly labeled.  Geotextile tubes need to be kept in their original packing until ready for use.  Do not unload tubes with hooks tongs or other sharp objects, and do not drag them along the ground. Dewatering tubes should always be stored in a safe, elevated, location away from accumulated water, and protected from conditions that will affect the properties or performance of the container.  Do not expose to very high temperatures (in excess of 180º C / 356º F).  When unwrapped for use,  avoid cutting geotextile tube and keep original tube identification information for future use.

Preparating the Site

Inspect the area where the dewatering cell will be built.  The site needs to be level in all directions (no slope across the width of the tube and maximum of .5% in the direction of the tubes length) and all obstructions removed to avoid damaging the geotextile tubes (such as roots and projecting stones). 

Construct a trench inside the perimeter of the cell to control the flow of the effluent away from the dewatering tubes to a sump or a gravity discharge location (flume). 

Build a perimeter containment berm around the cell to contain any potential release of sludge or effluent into the surrounding environment. 

Level the base of the cell and install an impermeable membrane should be installed over the entire floor of the cell and the berm, then embed in the surrounding soil outside the berm.  

Optionally, if the terrain is already leveled, the exterior berm could be constructed using sand bags, concrete highway barriers, railroad crossties, or hay bales. Then the cell shall be lined with an impermeable membrane. 

After installing the membrane, a non-woven geotextile may be installed over the entire surface to protect the membrane against heavy machinery traffic.  

Cover the floor of the cell with some type of drainage media such as a layer of drainage stone or drainage net to improve the flow of the effluent from underneath dewatering tubes container to the interior trench.

Southern Dredging & Marine Services offers installation of Southern Dredging & Marine Geotextile Tubes & Bags throughout Florida, as well as the Caribbean Island Region and Central and South America. By teaming with the design engineer, general contractor, and material manufacturer on each project, we ensure the proper product is specified and installed properly – and on schedule. Our field personnel are HAZMAT certified and have the knowledge and experience necessary to perform efficiently on even the most challenging project sites.

Installation of High-Strength Woven Geotextiles

Southern Dredging & Marine Services can install high-strength woven Southern Dredging & Marine Geotextile Tubes on diverse sites in Florida as well as the Caribbean Region such as Trinidad & Tobago, Anguilla, Virgin Islands, Jamaica, Dominican Republic, St. Lucia, Barbados, Bahamas and Aruba, as well as Central America like Belize and Honduras. We developed and routinely utilize a semi-automatic rough-terrain seaming system that is capable of achieving consistent and uniform seams with unusually high efficiencies at substantially faster installation speeds than others in the industry. On each project, prior to mobilization, fabric samples are test-seamed in our facility to ensure specified seam strengths are routinely achievable.

Additionally, Southern Dredging & Marine has the experience to seam and deploy the Southern Dredging & Marine Geotextile reinforcement systems for sludge lagoon closures.

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Sludge Lagoon Capping

Southern Dredging & Marine can install sludge cap reinforcement systems in the Southeastern United States, Caribbean and Central America Regions.

These systems can be installed in both wet environments (where a fabricated panel is floated across a wet lagoon) and dry environments (where the panel is sewn in place). Quite often we did this while working with such hazards as radiation, PCB’s, asbestos, heavy metals, elemental phosphorous, and ph extremes. Since we often work at DOE and Superfund sites, in addition to other hazardous environments, Our field personnel are HAZMAT certified since we work with such hazards as PCB's, radiation, asbestos, heavy metals or elemental phosphorous.

Southern Dredging & Marine can install geotextile fabrics, geogrids, and other polymeric products manufactured by almost every manufacturer in the industry in almost every environment imaginable. Although each site is unique, our vast experience allows us to approach each project with confidence as well as enabling us to assist other contractors on-site for the overall benefit of the project.

Southern Dredging & Marine Geotextile's woven fabric is made exclusively for the  purpose of working with sludge, either as reinforcement for a sludge cap or as a geotextile tube for dewatering sludge. This highly specialized geotextile exhibits superb tensile strength, is capable of achieving unusually high seam efficiencies, has an extended UV life span, and is competitively priced. Our sewn Southern Dredging & Marine Geotextile Tubes will not separate when undergoing mud waves liek the lapped geogrids do. Southern Dredging & Marine Geotextile consistently outperform geogrids in soft soils. When using our high strength woven geotextile fabric, the tubes performs both the separation as well as the structural support functions.

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Soil Reinforcement

Prior to the development of geosynthetics, construction of embankments and roadways on soft and saturated soils has always been very expensive. Because of the use of geotextiles, both woven and non-woven, engineers are able to layout structures more efficiently and economically, without having to demuck' areas containing unstable soils.

By installing high-strength woven geotextiles, our stronger and more efficient sewn seams create a stronger and more cost effective reinforcement system in the Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida and most of Central America..

Southern Dredging Services can install fabric on both dikes and roadbeds with the highest seam strengths.

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Custom GeoTextile Tubes Installation

Southern Dredging Services can provide Southern Dredging & Marine Geotextile Tubes and Engineered Sand Bags anywhere in the Caribbean or Central America region, and provide custom installation to meet your project needs

By teaming with the design engineer, general contractor, and material manufacturer on each project, we will provide the proper product from the specifications and install at your project site – while maintaining the agreed upon schedule. Our field technicians are HAZMAT certified and perform efficiently on even the most challenging project sites in the Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida and most of Central America..

Installation of High-Strength Woven Geotextiles

Southern Dredging Services utilizes a semi-automatic rough-terrain seaming system that is capable of achieving consistent and uniform seams with unusually high efficiencies at substantially faster installation speeds than others in the industry. On each project, prior to mobilization, fabric samples are test-seamed in our facility to ensure specified seam strengths are routinely achievable.

Additionally, Southern Dredging & Marine Services can provide seaming and deploying of Southern Dredging & Marine Geotextile reinforcement systems for sludge lagoon closures in areas in the Caribbean or South America such as Dominican Republic, Cayman Islands, Trinidad & Tobago, St. Lucia, Bahamas, Barbados, Antigua, Anguilla, Aruba, Martinique, Grenada, Belize and Guadeloupe, as well as in Florida, Georgia, Northa and South Carolina in the United States and most of Central America.

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