3.2 Hazardous & Medical Waste

The management of hazardous and medical waste poses significant risks to public health and the environment due to the potential for acute and chronic toxicity, infection, and environmental degradation. The federal government heavily regulates these wastes from the moment they are generated until their ultimate disposal.

RCRA Subtitle C Regulations: Cradle-to-Grave

The Resource Conservation and Recovery Act (RCRA) Subtitle C establishes a comprehensive 'cradle-to-grave' system for managing hazardous waste. This framework ensures that hazardous waste is safely managed from its generation (the cradle), through its transportation, treatment, and storage, to its final disposal (the grave).

Definition of Hazardous Waste

Under RCRA, a solid waste is considered hazardous if it meets one of two primary criteria: it is specifically listed by the EPA, or it exhibits a hazardous characteristic.

• Listed Wastes: The EPA explicitly names certain wastes as hazardous. These are categorized into lists (e.g., F-list for non-specific source wastes, K-list for source-specific wastes, P-list and U-list for discarded commercial chemical products).
• Characteristic Wastes: Even if not listed, a waste is hazardous if it exhibits any of the following four characteristics:
  1. Ignitability: Wastes that can readily catch fire and sustain combustion (e.g., flash point less than 140°F).
  2. Corrosivity: Wastes that are highly acidic or alkaline, capable of corroding metal (e.g., pH less than or equal to 2.0, or greater than or equal to 12.5).
  3. Reactivity: Wastes that are unstable, react violently with water, or can generate toxic gases or explosions.
  4. Toxicity: Wastes that are harmful or fatal when ingested or absorbed. This is determined using the Toxicity Characteristic Leaching Procedure (TCLP), a laboratory test designed to simulate the leaching of contaminants in a municipal solid waste landfill. If the extract contains contaminants above specified regulatory levels, the waste is toxic.

Generator Categories and Storage Limits

The stringency of RCRA regulations applied to a facility depends on the volume of hazardous waste it generates per calendar month.

1. Very Small Quantity Generators (VSQG): Formerly Conditionally Exempt Small Quantity Generators (CESQG). Generate less than 100 kg of hazardous waste per month. They are exempt from many RCRA regulations but must identify their waste and ensure delivery to an appropriate facility.
2. Small Quantity Generators (SQG): Generate between 100 kg and 1,000 kg of hazardous waste per month. They can accumulate hazardous waste on-site for up to 180 days (or 270 days if the treatment facility is over 200 miles away) without a storage permit, provided the total accumulation does not exceed 6,000 kg.
3. Large Quantity Generators (LQG): Generate greater than 1,000 kg of hazardous waste per month, or more than 1 kg of acutely hazardous waste. LQGs can only accumulate waste on-site for 90 days and are subject to the most stringent reporting, training, and contingency planning requirements.

The Uniform Hazardous Waste Manifest

Central to the cradle-to-grave concept is the Uniform Hazardous Waste Manifest (EPA Form 8700-22). This multi-copy shipping document tracks hazardous waste shipments. The generator, transporter, and the designated receiving facility (Treatment, Storage, and Disposal Facility - TSDF) must each sign the manifest and retain a copy. This ensures accountability and prevents illegal dumping.

Medical and Infectious Waste

Medical waste, particularly infectious or biohazardous waste, requires specialized handling to prevent the transmission of disease. While EPA plays a role, state environmental and health departments primarily regulate medical waste.

Packaging and Labeling

Proper segregation and packaging at the point of generation are critical.

• Red Bags: Infectious waste (e.g., blood-soaked bandages, cultures) must be placed in distinctive, tear-resistant red plastic bags.
• Sharps Containers: Needles, scalpels, and other sharps must be discarded in rigid, puncture-resistant, leak-proof containers.
• Biohazard Symbol: All containers holding infectious waste must prominently display the universal biohazard symbol.

Treatment and Disposal

Infectious waste must be rendered non-infectious before ultimate disposal in a sanitary landfill.

• Autoclaving: The most common treatment method. It uses pressurized steam to sterilize the waste, killing pathogens. Spore testing is required to verify the effectiveness of the sterilization cycle.
• Incineration: Effective for destroying pathogens and significantly reducing waste volume, but strictly regulated due to air emission concerns (e.g., dioxins).
• Tracking: Similar to hazardous waste manifests, medical waste typically requires a tracking document from generation to final destruction.

CERCLA (Superfund) Overview

While RCRA manages actively generated waste, the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), commonly known as Superfund, was enacted in 1980 to address abandoned or historical hazardous waste sites.

Key Components of CERCLA

• National Priorities List (NPL): The EPA evaluates contaminated sites using the Hazard Ranking System (HRS). Sites scoring high enough are placed on the NPL, making them eligible for long-term remedial action financed by the Superfund program.
• Strict, Joint, and Several Liability: CERCLA establishes a powerful liability framework. Potentially Responsible Parties (PRPs)—including current and past owners, operators, generators, and transporters—can be held strictly liable for the entire cost of cleanup, regardless of fault or whether their actions were legal at the time. This incentivizes extreme caution in modern waste management practices.