Definition: Secondary waste (or treatment residues)

Environment

Waste from secondary sources, i.e. waste generated in a process that is known as a waste treatment operation.  Includes residual materials originating from recovery and disposal operations, such as incineration and composting residues. 

N.B.: In accordance with the definition of waste, waste from sewage treatment (i.e. sewage sludge) is considered as primary waste.
Source:
Joint OECD/Eurostat Questionnaire 2002 on the State of the Environment, section on Waste
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