Types of industrial waste explained
Industrial waste is often grouped into a few broad categories, but the boundaries matter.
Solid waste
Solid waste includes packaging, offcuts, general workshop waste, redundant equipment and similar materials. Whether it can be segregated efficiently depends on the waste streams and how the site operates. Container choice depends on volume, density and how material is loaded.
Liquid waste
Liquid waste includes wash waters, process liquors, tank contents and sludges. Some liquids may be discharged only where the relevant consent or permit allows it, while others need collection and treatment off site. The correct route depends on the material, the discharge destination and the authorisations that apply.
Hazardous waste
Hazardous waste is identified through the applicable waste-classification rules, including whether the waste displays hazardous properties or falls within an absolute hazardous entry. Examples can include asbestos waste, certain solvents, oils, batteries and some equipment containing hazardous substances. Additional requirements apply to hazardous waste, and the detailed rules differ across England, Wales, Scotland and Northern Ireland.
Mirror entries
Some entries in the List of Waste have both a hazardous and a non-hazardous version, known as mirror entries. The correct code depends on the waste, including the source or process that produced it and, where relevant, assessment of its composition and hazardous properties. This is where a documented classification decision matters.
Recyclables
Recyclables include metals, cardboard, plastics, glass and some process by-products. Material quality and contamination can affect which recovery routes are available. Segregation, storage and collection arrangements also influence the options available to the site.