Sorting, counting, transporting, and handling seeds all generate significant amounts of dust. Seed producers and cereal processors must therefore implement effective dust-collection systems to improve workplace conditions and protect operator health. Where does this dust come from? What risks does it pose? Which dust-collection solutions are best suited? Our article provides a detailed overview.
Where does this dust come from?
The various stages of handling, sorting, and processing seeds and cereals generate suspended solid particles in the air. The dust released by seeds varies in nature. It may be vegetal, when it originates from the seeds themselves or from other plants. It may also be mineral, when it comes from the surrounding environment (rocks, soil) of the crops. Finally, it may consist of chemical residues, such as phytosanitary product residues when the seeds have been treated.
What risks?
The dust generated by the seed industry can contaminate the body, primarily through the respiratory tract. The smaller the particles, the deeper they penetrate into the lungs, reaching the bronchioles and pulmonary alveoli. Contamination can also occur through ingestion—either directly by mouth or via contact with contaminated hands. Contact with the skin and mucous membranes also presents a risk.
Beyond the dust itself, the presence of chemical substances from phytosanitary treatments introduces an additional hazard, particularly for the skin. Depending on their size, concentration, and nature, these seed dusts may cause disorders of varying severity: local irritation (coughing, conjunctivitis, skin redness), allergies such as asthma, rhinitis, conjunctivitis, eczema, or acute or chronic poisoning linked to phytosanitary treatment products—some of which are carcinogenic, mutagenic, or reprotoxic.
Lastly, cereal and seed dusts also pose explosion and fire risks. These risks are especially dangerous when they occur in confined environments, such as silos. Preventing explosions and associated hazards is subject to specific regulations known as ATEX regulations.
Expert advice
The ATEX regulations (for ATmospheres EXplosives) stem from two European directives: 2014/34/EU (ATEX 95) concerning equipment intended for use in ATEX zones, and 1999/92/EC (ATEX 137) concerning worker safety. The classification of ATEX zones is carried out according to standards defined for each material presenting a risk. The product’s ability to disperse in air, combined with the ventilation implemented in the area, determines whether the concentration of combustible material in the ambient air can create an explosive mixture.
Focus: cereal dust and endotoxins
Exposure to organic dust—particularly dust from cereals or seeds—can cause Organic Dust Toxic Syndrome (ODTS), a set of flu-like symptoms (fever, muscle pain, chest tightness, difficulty breathing…). This condition is triggered by endotoxins present in excessive amounts in the work environment.
Learn more about endotoxins.
What industrial dust-collection solutions are available?
Two main methods are used to handle dust generated in the cereals and seed industry: centralized dust collection and point-of-use dust collection.
Centralized dust collection consists of channeling the various extraction airflow rates from each capture point toward a single collector filter.
Point-of-use dust collection treats each dusty airflow directly at its source, locally and individually.
Centralized extraction systems rely on several techniques to separate air from dust: mechanical methods (settling chambers, cyclone devices) or porous-media filters (bags, pockets, cartridges, pleated panels…).
Regardless of the filtration principle selected, the system captures and concentrates the dust. The collected dust must therefore be handled carefully, in particular to prevent explosion risks.
In cyclone-based systems, dust may be collected in a chamber emptied manually by an operator. Dust can also be recovered by gravity discharge into a storage hopper located beneath the bag filter or cyclone, or into an external dust-collection room, depending on the installation.
Focus on filter bags
Filter bags are dust collectors in which dust-laden air passes through a filter layer on which the particles are deposited. Industrial baghouse filters can handle large air volumes and a wide variety of dust types. They can operate under very diverse service conditions, depending on the filter media used.
Unlike cyclonic separators, where particles are removed continuously, bag filters accumulate dust, which must periodically be dislodged by a cleaning process (reverse pulse, vibration, etc.). The filter media is generally arranged in long bags forming large pockets, often several meters in length.
Schematic representation of a bag filter during the dust-collection phase (left) and the cleaning/declogging phase (right).
Advanced manufacturing techniques—such as precision cutting and continuous computer-assisted thermal bonding—make it possible to produce industrial baghouse filters suitable for all types of dust-collection systems:
• reverse-pulse jet cleaning,
• air-rinsing systems,
• vibration-based cleaning systems.
Expert advice
Different materials can be used: polyester, PTFE-laminated media, nanofibers, with optional special treatments (antistatic, hydrophobic, oleophobic, etc.).
Dust-collection cartridges
An alternative to filter bags, pleated cartridges provide a much larger filtration surface. Cartridge filters also offer a broader technical range, particularly in terms of airflow capacity and filtration efficiency. They can be manufactured using different filter media (for example polyester), depending on requirements, making them especially suitable for industrial dust collection.
Like baghouse filters, cartridge filters are equipped with cleaning systems—either pneumatic, using compressed-air pulses, or mechanical, using vibrators. As with filter bags, cartridges can be installed in stand-alone dust collectors at the point of use, or—though less commonly—in centralized systems.
Filter panels
The latest generation of dust-collection filter elements, pleated filter panels are used to handle high dust concentrations. Compact in design, they are particularly well suited when operator handling ergonomics must be optimized.
They offer the same technical specifications as cartridge filters. Available in standard sizes, they can also be custom-manufactured on request to fit existing installations.
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