ALLU Stabilization is a step ahead in providing a proven sustainable green solution for ash ponds.

In-situ stabilization of deep ponds provides a less expensive green solution to ash ponds

We are all aware of the environmental impact of coal ash in the United States. Potential air and water hazards are a concern for all parties involved. Loose particles of fly ash can float through the air to surrounding communities, causing various respiratory problems for nearby residents. Abandoned and operational ash ponds have a high potential to leach into groundwater carrying chemicals such as lead, arsenic and mercury to the municipal water supply.

What to do with these ponds has been the focus of much debate between power generation providers and conservationists. Finding an acceptable solution that would provide a safe, permanent and economically feasible solution was a challenge. The EPA allows two methods, closure in place and closure by withdrawal. Each method presents its own challenges and drawbacks.

Closing in place or “plugging” the pond is usually done using a process known as “bucket mixing” which is accomplished by dumping bags of powdered binder (usually Portland cement) on the surface of the pond (NOT METER). The binder is then mixed using the buckets of a crawler excavator. A shallow plug forms as the cement hardens. Although much cheaper than removal. The main problem exists under the ‘plug’, the moisture remains in the unstable contaminated soil allowing continuous seepage into groundwater. The padded floor is unsuitable for construction and difficult to upgrade. Additional dust pollution is also created during the bucket mixing process.

Closure by removal minimizes the overall risk of groundwater pollution, but presents its own set of problems. Compared to in-place closing costs, removal costs and time can be more than five times that of in-place closing. Relocation to an approved disposal site (landfill) can also be difficult with dust and contaminants released during transport. Regulating the landfill site can also be difficult. If not properly maintained, these sites can be affected by the wind carrying collected dust over great distances. Stormwater can seep through the ash and continue to contaminate groundwater.

Deep basin stabilization provides an innovative solution that solves problems present in both plugging and removal. The ALLU Ground Stabilization System has been used throughout Europe for over a decade. The system uses a powerful mixing head attached to the boom of a mid-size excavator. The mixing head is fed dry binder by a computer controlled high pressure feeder creating a homogeneous mix. Unlike bucket mix; the system is capable of depths beyond 20′. The ash basin is stabilized from bottom to top and not just on the surface. The feed system precisely regulates the exact amount of binder prescribed by the engineer to properly encapsulate the contaminated site. (CONTROLLED COST BINDER)

The area is stabilized from bottom to top.

As it is now a solid mass. Potential groundwater contamination as well as dust pollution from wind, rain or during transport are eliminated. Costs are controlled by eliminating the need to build and maintain landfills. Fewer fossil fuels are used without the need to transport them to an offsite location. A solid surface remains which continues to harden over time allowing for repurposing of the existing ash containment basin. A truly green and sustainable solution.

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