Hazardous wastes must be segregated prior to disposal. Hazardous wastes include materials which may be contaminated with radioactive hazards, chemical hazards and biohazards. These must be separated from each other for disposal into separate hazardous waste streams.
If waste materials are contaminated with multiple types of hazardous materials—mixed hazardous wastes (e.g., radioactive biohazards or chemically-contaminated biohazards), all hazard types must be addressed for treatment and/or disposal.A general hierarchy exists within hazardous wastes, related to the degree of difficulty and regulatory requirements required for disposal. Radioactive wastes stand at the top of the hierarchy, followed by chemical hazardous waste, and lastly by biohazardous wastes. Because biohazards can often be deactivated by chemical or physical methods, when presented with a mixed waste scenario, the most straightforward method for disposal is often to decontaminate the biohazards and then dispose through the higher hazardous waste stream.
The 4 medical waste streams (biohazard, pathology, trace chemotherapy, pharmaceutical) must be segregated and labeled for appropriate disposal. Biohazard wastes are autoclaved and landfilled; pathology, trace chemotherapy wastes and pharmaceutical wastes are all incinerated. Therefore any materials which may have potential trace chemical hazards (e.g., fixed tissues, trace chemotherapy wastes) cannot be placed in biohazard waste containers, and must be segregated into the appropriate incineration medical streams.
Waste segregation, treatment and responsibilities should be fully detailed at the facility generating hazardous waste. The plans for disposal of these materials should be made prior to generating hazardous wastes at your facility.
Source: https://www.ehs.ucla.edu/research/bio/mwm/#MW seg cont trans