Case study: Landfill controls fly ash dust and moisture with misting dust suppression tech

dust suppression towers fly ash landfill

Maintaining the appropriate moisture level is important in preventing the ash from drying out and potentially creating dust that could migrate off-site.

Operators of a large Midwestern landfill have typically used “big gun” spirinklers designed for irrigation to maintain the moisture content of dewatered and compressed fly ash slurry.

While the dust control techniquse effectively prevented dust formation from drying ash, it tended to oversaturate the piles of stored material awaiting burial. The result was a dense muck that tended to stick to loaders and other equipment, making it harder to load and transport.

Landfill officials investigated a variety of options to prevent the stored piles from drying out, without applying so much water that it created a mud-like material. The company decided on three DB-60s from DustBoss line of dust suppression machines.

The three units were ordered on tower mounts, to increase their range, effectiveness, and coverage area.

Fly ash from the power plant is initially contained in a slurry, which goes through a dewatering and compression process, eventually producing hard chunks of material to make it easier to store and landfill.

Maintaining the appropriate moisture level is important in preventing the ash from drying out and potentially creating fugitive dust that could migrate off-site.

tower mounted dust control machines aimed at fly ash stockpileUnlike the sprinkler approach, which is designed to distribute large quantities of water for agricultural purposes, all DustBoss equipment is specifically designed for dust control. Instead of maximum water delivery, the DustBoss provides optimum water delivery.

The long range of the DB-60s delivers a controlled mist that effectively provides enough moisture to prevent the compressed material from drying out, yet the result is a lightly damp surface, rather than saturation. The machines are started manually, and together the three units can cover nearly the entire storage area with a fine-dust-trapping mist within about 15 minutes.

As a result, the compressed ash can be loaded more quickly, without sticking to equipment and trucks. By having the right moisture content, the material can be unloaded and buried with less time and effort, contributing to greater overall efficiency and reduced water consumption.

CUSTOMER
Landfill Operation

LOCATION
Midwestern U.S.

CHALLENGE
Find an alternative to “big gun” irrigation methods of applying moisture to a dewatered fly ash slurry from a coal-fired electrical generating facility, preventing the compressed ash from drying out at the landfill, but avoiding over-saturation.

SOLUTION
Three DustBoss® 60s (DB-60s) on tower mounts. The DB-60 is a powerful ducted fan design with a 25 HP motor that generates 30,000 CFM, capable of covering as much as 21,000 square feet (1,950 square meters) with a fine mist of atomized droplets for outstanding dust control.

RESULTS
The three DB-60s deliver a controlled mist over a very wide area containing the piles of dewatered and compressed ash, maintaining an appropriate level of moisture without saturating the material or creating a mud-like consistency. The stored material is easier to load, transport and bury.

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