Dust Suppression

Dust suppression controls airborne particles generated during bulk handling to protect air quality and surrounding environments. This may include, among others, water sprays or fogging systems at transfer points, water trucks for haul roads and stockpiles, automated misting systems, chemical suppressants where appropriate, vegetative wind barriers, and operational controls such as reduced drop heights.

For DMC ports, dust suppression can improve air quality for workers and communities, reduce health risks from particulate exposure, minimize material loss, prevent contamination of soil and water, and support regulatory compliance.

Dust generation occurs at multiple points in bulk materials handling, including, among others, ship loading and unloading, conveyor transfer, stockpile formation and reclaim, loading of vehicles and railcars, and haul road operations. Particulate matter released can include both inhalable (PM10) and fine (PM2.5) fractions, with fine particulates posing greater human health risks due to deeper respiratory penetration (US EPA, 2021; US EPA, n.d.).

Water based suppression is a widely applied dust control approach in bulk ports. Water spray systems at transfer points use controlled nozzles to generate droplets that capture airborne particulates. Misting and fogging systems, such as those provided by DustBoss and EcoFog, generate fine droplets (for DustBoss atomized mist, 50 to 200 micrometers) that are effective at capturing smaller dust particles while minimizing water use (BossTek, 2020; Barra Project, 2024).

Water trucks provide mobile dust suppression for haul roads, stockpiles, and construction areas. Road wetting schedules are typically informed by weather conditions, traffic volumes, and dust monitoring data. Automated misting systems can apply water based on dust sensor readings or scheduled intervals, reducing labor requirements and supporting consistent application.

Chemical suppressants, such as polymer based or lignosulfonate based products, form surface crusts on stockpiles and haul roads that reduce dust generation over extended periods. Chemical suppressants are typically applied to inactive stockpiles or low traffic road surfaces where persistent dust control is required without continuous water spraying.

Complementary dust controls include, among others, vegetative wind barriers, physical wind fences, stockpile geometry adjustments, reduced drop heights for stacker reclaimers, and telescopic chutes that contain material flow.