Dust, Silica and Asbestos Risks in Resource Recovery Sites

Resource recovery, recycling and material reprocessing sites are often spoken about as 'waste businesses'. From a WHS standpoint that framing is misleading. These are high-material-movement operations where significant volumes of mixed material are tipped, sorted, crushed, screened, conveyed and stockpiled every day. Each of those steps generates dust — and depending on the input stream, that dust can carry crystalline silica, asbestos fibres or other contaminants.

South Australia regulates this exposure through the WHS Act 2012 (SA), the WHS Regulations 2012, the model Code of Practice for Managing the Risks of Hazardous Chemicals in the Workplace, and the model Code of Practice: How to Manage and Control Asbestos in the Workplace. SafeWork SA expects operators to identify foreseeable hazards, assess exposure, implement controls in line with the hierarchy of control, and keep evidence that those controls are working.

The first risk is respirable crystalline silica (RCS). Concrete, brick, tile, masonry and natural stone — all common at construction and demolition (C&D) recycling sites — contain crystalline silica. When they are crushed, screened, cut or transported, fine respirable particles are released. Workers and nearby personnel can inhale these particles even when no visible dust cloud is present.

The second risk is asbestos contamination. Demolition-derived material is the highest-risk input stream because asbestos cement sheeting, vinyl tile backing, pipe insulation and gaskets were widely used in Australian buildings until the 2003 ban. If intake screening, segregation and rejection procedures are weak, contaminated loads can enter the processing line — at which point the risk is no longer one truck but the entire facility, downstream product and surrounding air.

The third risk is general nuisance and combustible dust from organic, plastic or fine mineral fractions. While not as acutely toxic, these can create visibility, respiratory irritation, fire risk and environmental complaints — all of which attract regulator attention.

What good practice looks like at a resource recovery site is consistent: documented hazard identification across every process step; a written risk assessment for silica and asbestos; engineering controls (water suppression, enclosures, extraction); administrative controls (intake procedures, exclusion zones, traffic management); appropriate respiratory protective equipment with fit testing; air monitoring where exposure cannot otherwise be characterised; and review at defined intervals or after any change.

Where this commonly breaks down is documentation. Operators may have controls in place, but if a SafeWork SA inspector or insurer asks to see the silica risk assessment, the asbestos contamination procedure, monitoring records, training registers and review history, an absence of records is treated as an absence of control.

AX4 works with C&D recyclers, concrete crushing and recycling yards, materials recovery facilities (MRFs), transfer stations and waste processors across South Australia to baseline these risks, build the underlying compliance documentation, plan exposure monitoring, and provide ongoing assurance.

Related in this cluster: silica air monitoring obligations, asbestos contamination risk in C&D recycling, the documentation a SafeWork SA-ready site should hold, practical dust control measures, and why evidence-based WHS records protect the business.