Archive for April, 2010

Geomembrane Liners

April 29, 2010

Geomembrane Liners

Geomembrane Liners can be installed for the following applications:

  • High Density Polyethylene (HDPE), PVC, EPDM, Reinforce
  • polypropylene (RPP) & XR-5 liners
  • secondary containment systems
  • tank liners
  • landfill liners
  • pond/lagoon liners
  • stud liner systems
  • golf course pond liners
  • pipe liners

Keep in mind, experience in fabrication, repair and project management, are all critical to success of any project.


Gas Collection Floating Covers Applications and Advantages

April 27, 2010

Gas Collection Covers

Gas Collection Covers can be specifically designed for each client utilizing a variety of material options.

Gas Cover Applications:

  • any type of gas collection from water basin
  • keep rain & snowmelt water separate from wastewater under the cover

Gas Cover advantages:

  • can be installed without site interruption
  • can be installed on tanks or lagoons
  • eliminates rainwater ponding problems
  • eliminates gas ballooning
  • provides high buoyancy and rigidity
  • hatches provide access to in-basin equipment
  • pre-manufactured panels improve quality
  • are fabricated at IEC’s plant, so field welding is not required

Gas Collection Covers are floating cover systems used to collect gases from wastewater treatment lagoons, sludge ponds, aeration systems, flow equalization tanks and pretreatment tanks and agricultural waste.

In the case of anaerobic digestors, gas cover systems are used to capture biogas.  The biogas can disposed of in a flare, or it can be burned to generate process heat or electricity.   Other benefits of a gas cover system include reduction of process heat loss/gain, elimination of water evaporation and prevention of sunlight penetration.

Features can include insulation, automatic rainwater removal, baffles, sample ports and hatches. Nearly any water level fluctuation requirement can be accommodated.

These durable, UV protected covers can be installed quickly without disrupting plant operations and are easy to maintain while in service.  Gas floating covers are strong enough to safely support foot traffic, light vehicles and snow loads.

Insulated Gas Collection Floating Covers

April 22, 2010

Insulated Gas Collection Covers

Insulated Gas Collection Covers

  • any type of gas collection from water basin
  • keep rain & snowmelt water separate from wastewater under the cover

Other Advantages are:

  • allows option of removal and reinstallation of cover
  • allows easy integration with in-basin equipment
  • can be installed on tanks or lagoons
  • Insulated Modular Cover protects gas cover geomembrane
  • increases life of gas cover membrane
  • improves system performance
  • pre-manufactured panels improve quality
  • gas cover hatches provide access to in-basin equipment

What Is Anaerobic Digestion?

April 20, 2010

In anaerobic digestion, methane and carbon dioxide are released as special bacteria convert the organic material into safe biosolids.  The bacteria can exist only in a non-air environment, and work more quickly at elevated temperatures, so a floating cover keeps the temperature stable, contains odors, and traps gasses, which are normally 50 to 75 per cent methane.  The methane is sometimes burned off, or in an increasing number of cases, collected and used to power the facility or sold to utility companies for resale.

To understand more about how anaerobic digestion works, see our article “What Do Floating Covers Do?”

What Do Floating Covers Do?

April 15, 2010

A floating membrane cover installed over the surface of a lagoon or tank rises and falls with the changing level of the liquid.  When used on water reservoirs, floating covers protect the contents from contamination and evaporation.  Used to cover chemical, industrial waste and wastewater lagoons they protect the surrounding area from the material contained.  Floating covers can also collect methane, which is released when anaerobic digestion takes place in concentrated animal feeding operations (CAFO) and food processing plants.  The methane (biogas) is often used to help power the facility, or it may be sold to utility companies for resale.

The cover shown includes a series of floats arranged in strings of parallel pairs with weights centered between them, forming troughs.  The floats that are laid out around the cover create sufficient tension to allow workers to walk on it.  That tension also channels rainwater to the troughs, then to dewatering pumps for removal.

While material selection for floating covers is site-specific, in all cases it must be resistant to UV degradation, tears, and punctures; it must have excellent seam strength—enough to hold up to foot traffic; and it must be very flexible.  The type of liquid contained, its chemical composition, its temperature range, the ambient temperature range, environmental conditions, and the intended function of the cover are some of the variables that must be considered.  For example, reinforced polypropylene was used for the water reservoir shown.

Floating covers are an economical way to protect water resources in ponds and reservoirs. Compared to building a tank, a pond with a floating cover is a much less expensive option. Floating covers have many uses from the storage of potable water to the collection of biogas from waste water.

Custom Floating Tank Covers

April 13, 2010

Floating Tank Covers

Floating tank covers can be custom designed for lagoon or tank applications.   Floating covers are a cost-effective alternative to many aluminum or fiberglass dome applications and do not require venting (non-gas-collection applications), recirculation or explosion proof equipment.  Tank covers can adapt to varying water levers and in-basin equipment.  They also install easily and quickly.

Tank Co
ver Advantages:

  • maintenance free
  • fabricated to your exact tank shape
  • the contents of the tank can be mixed without removing the cover
  • hatches provide access to in-basin equipment
  • can be designed to operate around piping/mechanicals inside the tank

Floating tank covers are used on open topped tanks where a structural cover would be too expensive. Floating tank covers are made with flexible geomembrane materials made to stand up to sunlight and the many chemicals found in tanks.

Modular Floating Covers

April 8, 2010

Modular Cover System are comprised of a series of individual casings, which are connected together to form a complete, floating cover system. Each individual casing consists of a panel of closed cell insulation encapsulated between 2 sheets of durable geomembrane.  The result is a unique floating cover system that provides insulation values ranging from R-2 to R-30; and is engineered and manufactured to specific dimensions/basin requirements.

The Modular Cover System offers the following advantages over conventional covers systems:

  • maintenance free
  • can be installed on tanks or lagoons
  • adepts to varying water levels
  • individual casings are removable
  • installed without site interruption
  • shorter installation time, no field welding required
  • installation requires less heavy equipment
  • eliminates rainwater ponding problems
  • eliminates gas ballooning
  • high buoyancy and rigidity
  • hatches can provide access to in-basin equipment

Floating Cover Applications Part 2

April 6, 2010

Floating Covers are designed to provide many years of lasting service in a variety of environments and the following applications:

  • odor control
  • algae control
  • wastewater treatment
  • potable water treatment
  • biological treatment
  • gas collection
  • rainwater prevention
  • bird/animal control
  • chemical storage/containment
  • airport glycol containment
  • food industry
  • pulp & paper
  • manufacturing water reuse
  • pond liner systems
  • tank liner systems
  • pipe liner systems
  • stud liner

Many have provided a service life beyond 20 years.  When first introduced, materials and designs were not developed and in some cases had limited success.  Today, with advancements in design and materials, floating covers offer the low cost quality solution of choice where water quality standards require potable water reservoirs be covered.

Floating Covers Applications and Advantages Part 1

April 2, 2010

Floating Covers are customized for each client’s lagoon or tank size and shape.

A series of lateral floats provide pathways for gas to flow underneath to the perimeter collection pipe and on to a single collection point.  The lateral floats keep the entire cover floating on the waters’ surface, and eliminate cover inflation, and exposure to wind damage.

Floating covers that inflate (without lateral floats) expose the geomembrane cover to vibration and geomembrane fatigue from wind constantly blowing over the inflated cover.  This significantly reduces the life span of the cover.

Ballast weights on top of the floating cover channel rainwater and snow melt to sumps to remove all rainwater from the surface of the floating cover.

Floating Cover Applications:

  • any type of gas collection from water basin
  • keep rain & snowmelt water separate from wastewater under the cover

Floating Cover Advantages:

  • provide a true “floating” cover, keeping the cover on the water surface avoiding damage from wind due to an inflated cover without lateral floats
  • accommodate fluctuation in water level
  • can be installed without interruption in basin use
  • can be installed on tanks or lagoons
  • eliminates rainwater pooling problems
  • eliminates inflating the cover and gas ballooning
  • hatches provide access under the cover for equipment