This paper examines the scope and consequences of waste generated by healthcare activities, from hospitals and laboratories to blood banks and nursing homes. It categorizes hazardous healthcare waste — including infectious, chemical, pharmaceutical, genotoxic, and radioactive materials — and quantifies their share of total waste output. The paper details the public health risks posed by improper disposal, including global hepatitis B, hepatitis C, and HIV infections linked to syringe reuse. It then analyzes the collaborative memorandum of agreement between the American Hospital Association and the U.S. Environmental Protection Agency, focusing on life-cycle thinking, mercury reduction, pollution prevention, and supply chain environmental screening as frameworks for systemic improvement.
Healthcare is the prevention, treatment, and management of illness and the preservation of mental and physical well-being through services offered by the medical and allied health professions (Dictionary.com, 2005). Healthcare covers disease management, emergency preparedness, emergency department overcrowding, pain management, and patient safety (Jayco, 2005). These healthcare activities encompass immunizations, diagnostic tests, medical treatments, and laboratory examinations aimed at protecting and restoring health and saving lives. However, the by-products and wastes generated by these activities have not been adequately addressed.
Studies and records show that of the total wastes generated by healthcare activities, almost 80% are general wastes, comparable to domestic wastes, and the remaining 20% are considered hazardous materials, which can be infectious, toxic, or radioactive (WHO, 2005). Infectious wastes are made up of cultures and stocks of infectious agents, wastes from infected patients, wastes contaminated with blood and blood derivatives, discarded diagnostic samples, infected animals used in laboratories, contaminated materials such as swabs and bandages, disposable medical devices, and anatomic wastes such as recognizable body parts and animal carcasses. These infectious and anatomic wastes combined represent the majority of hazardous wastes, accounting for up to 15% of total wastes from healthcare activities.
Sharps, chemicals, and pharmaceuticals contribute to the bulk of remaining wastes. Examples of sharps include syringes, disposable scalpels, and blades; these represent 1% of total healthcare waste. Chemical wastes include solvents and disinfectants, while pharmaceutical wastes include expired, unused, and contaminated drugs or their metabolites, vaccines, and sera. Chemical and pharmaceutical wastes account for approximately 3% of wastes from healthcare activities. Genotoxic wastes are highly dangerous mutagenic, teratogenic, or carcinogenic materials — for example, cytotoxic drugs used in cancer treatment and their metabolites. Radioactive matter, emitted from glassware contaminated with radioactive diagnostic or radio-therapeutic materials, along with heavy metal content, accounts for approximately 1% of the total waste volume produced by healthcare activities.
The main sources of these healthcare wastes are hospitals and other healthcare establishments, laboratories and research institutions, mortuary and autopsy centers, animal research and testing laboratories, blood banks and collection services, and nursing homes for the elderly (WHO, 2005). High-income countries produce up to 6 kilograms of hazardous waste per person per year. In many low-income countries, wastes are usually not differentiated into hazardous and non-hazardous categories and amount to anywhere from 0.5 to 3 kilograms of healthcare waste per person per year.
These wastes are a source of potentially harmful micro-organisms that threaten hospital patients, healthcare workers, and the general public. Potential infection risks include the spread of sometimes resistant micro-organisms from healthcare centers into the surrounding environment. These wastes and by-products can cause injuries such as radiation burns and sharps-inflicted wounds, as well as poisoning and pollution through the release of pharmaceutical products — including antibiotics and cytotoxic drugs — waste water, or toxic elements and compounds such as mercury or dioxins.
Throughout the world, approximately 12 billion injections are administered annually, and not all needles and syringes are properly disposed of. This creates a considerable risk of injury and infection, as well as opportunities for reuse. Globally, 8 to 16 million hepatitis B cases, 2.3 to 4.7 million hepatitis C cases, and 80,000 to 160,000 HIV infections result from the reuse of syringe needles without sterilization. Disposable syringes and needles are commonly reused in certain African, Asian, and Central and Eastern European countries. In these regions, additional hazards arise from scavenging on waste disposal sites and the manual sorting of waste from the back doors of healthcare establishments (WHO, 2005). Waste handlers are exposed to needle-stick injuries and other forms of contact with toxic or infectious materials.
Further risks result from the treatment or disposal of healthcare wastes. Occupational risks include inadequate incineration or the incineration of materials unsuitable for that process, which can release pollutants into the air. Incinerated materials containing chlorine produce dioxins and furans, which are considered possible human carcinogens and are associated with a wide range of adverse health effects. The incineration of heavy metals or materials with high metal content can spread those metals into the environment. Only modern incinerators operating between 800 and 1,000 degrees Celsius, and equipped with special emission-cleaning features, can ensure that no dioxins or furans are produced.
"Regulatory gaps and scale of medical waste problem"
The American Hospital Association and the U.S. Environmental Protection Agency joined forces through a memorandum of agreement to address the condition and reduce the volume and toxicity of wastes by 2010, as well as to achieve the virtual elimination of mercury from healthcare by the year 2005 (Kaiser et al., 2001). The alliance utilizes a network of relationships and decisions covering product suppliers, healthcare workers, and hospital waste treatment decisions. The two organizations recognized the link between harmful pollutants — particularly mercury and dioxin, identified in significant quantities in the air and ash emissions of medical waste incinerators — and human health.
The alliance applies life-cycle considerations in evaluating the environmental impact of medical products and services across the stages of manufacture, distribution, use, and end-of-life disposal, rather than focusing solely on the costs directly related to waste disposal. These costs are associated with collection, transport, treatment, and disposal. Healthcare professionals within the organizations review their waste disposal methods and develop criteria for the environmental screening of products. Personnel responsible for procuring healthcare products and services — such as materials managers and purchasing agents — are screened according to their qualifications, and many have working experience within healthcare settings, such as nursing or other technical disciplines.
The overall healthcare supply chain management process has been revised to incorporate criteria directly linking product selection, product use, product disposal, and environmental and community health impacts. Product acquisition also includes evaluating upstream life-cycle steps in resource use, energy demands, and global impact.
"Environmental criteria embedded in procurement and training"
"Systemic approach balancing quality care and environment"
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