Mobile dust suppression keeps demolition emissions from leaving sitePublished 3/7 at 13:01
River City Demolition used a self-contained and mobile DustBoss DB-60 Fusion, manufactured by BossTek, to suppress airborne dust created by the jaw processor and falling debris during the demolition of a five story concrete parking lot in a densely populated area.
The result was adjustable wide area control of airborne and surface dust that reduced the need for manned hoses, thereby maintaining air quality needed to comply with regulations.
From the outset, planners realised that the downtown location of the soon to be demolished parking lot would require dust control beyond the conventional approach of manual spraying with a fire hose. “With occupied buildings on two sides, and city streets on the other two, we wanted to find the best method available to suppress the demolition dust and prevent its migration,” observed River City’s Josh Runyon. “We knew our water trucks could help control surface dust on the ground, but our big concern was finding a way to address airborne dust, something that could knock down particles and keep them on site.”
Due to the close-in location and confined space, River City crews decided to use a jaw processor to pulverise the concrete and take the parking lot decks down a section at a time. That helped avoid dust clouds from large sections falling at once, but Runyon stressed the need for containment when he spoke to BossTek sales manager Mike Lewis.
“When Josh called us, we had a DustBoss® DB-60 FusionTM on hand, which is one of our larger designs that’s equipped with its own generator for locations without convenient access to power,” Lewis commented. With all components mounted on a road worthy trailer, the system gave River City crews the versatility to position the fan driven unit wherever it was needed on a given day.
The DB-60 Fusion forces water through a circular stainless steel manifold with 30 atomising spray nozzles, then launches millions of tiny droplets with a powerful 25HP fan that produces 849.50 m3 (30,000 ft.3) of air flow. Atomised mist droplets of 50 to 200 microns in size are thrown out in a 60m (200ft) cone at an adjustable 00 to 500 elevation angle, capturing airborne dust particles and dragging them to the ground.
Rather than have personnel handling hoses to suppress the dust, the single atomised misting unit delivers 5,834m2 (62,800ft.2) of coverage, while using far less water than hoses and sprinklers. The unit is paired with a 45kW generator featuring a John Deere Tier III Flex engine enabling up to 24h of runtime. At just 2.03m wide (80 inches) wide, the system can be placed virtually anywhere dust suppression is needed and adjusted based on changes in wind or work activity. An optional dosing pump is powered from the standard 120V electrical outlet on the generator, allowing operators to precisely meter surfactants or other additives. The unit’s versatility makes it suitable for uneven ground, as well as open spaces or tiered terrain.
Water sources can vary, and the unit requires a constant supply pressure of just .069bar (10psi). The water is delivered to the atomised misting unit through a hose with a cam-and-groove quick disconnect coupling leading to the booster pump. The pump adds approximately 10.34bar (150psi), with a maximum of 17.23bar (250psi), depending on the inlet pressure. For use with a non-potable water source, the DB-60 can be equipped with a number of filter options.
As to the project itself, Runyon’s suspicions proved correct. “It was one of the dustiest projects I’ve ever worked on, but the DustBoss did a great job. We could locate and aim it perfectly each day, and neighbours seemed pleased with the dust management. In fact, we didn’t receive a single dust related complaint during the entire job.”
For more than a decade BossTek has been an innovator in dust suppression, developing a wide range of equipment and accessories that enable atomised mist technology to control fugitive particles for applications in demolition, construction, waste and scrap handling, recycling and landfills. Recently the company has extended its offering to include odour management solutions using similar technology, which distributes safe and environmentally friendly topical and airborne deodorants. Headquartered in Peoria, IL (USA), the company’s dust and odour control units are designed and manufactured in the USA and delivered to customers around the world, with its equipment sold to users in 40 different countries to date.