INTRODUCTION TO INFECTION CONTROL IN CLINICAL SETTING
Biomedical Waste Management: Segregation, Disposal & Color Coding
Understand biomedical waste management, including hospital waste types, segregation, disposal, color coding, storage, transportation, and treatment for safer healthcare practices.
Learn about biomedical waste management, types of hospital waste, segregation, disposal methods, color coding, storage, and treatment of medical waste.
Table of Contents
Biomedical Waste Management
Definition of Biomedical Waste
Medical Waste: Any waste generated during the diagnosis, treatment, or immunization of humans or animals. This includes waste produced during research related to these activities. It also covers waste from the production or testing of biological materials.
Biomedical Waste: Waste produced during medical activities, including diagnosis, treatment, immunization, research, and biological production/testing. It also includes waste from slaughterhouses.
Biomedical waste is any waste contaminated with patients’ body fluids, including:
- Syringes & Needles
- Ampoules
- Organs & Body Parts
- Placenta & Dressings
- Disposable Plastics
- Microbiological Waste
Principles of Biomedical Waste Management (3Rs)
- Reduce: Minimize waste generation.
- Recycle: Reprocess materials when possible.
- Reuse: Safely reuse items where applicable.
Importance of Biomedical Waste Management
1. Environmental Protection
- Reduces air, water, and soil pollution.
- Supports government initiatives for a cleaner environment.
2. Prevention of Infections & Health Hazards
- Prevents the spread of infectious diseases like HIV, Hepatitis B, and Tuberculosis (TB).
- Protects healthcare workers, patients, and the community from hazardous exposure.
3. Legal Compliance
- The Biomedical Waste Management Rules (1996) make proper waste disposal a legal obligation.
- Hospitals must follow government guidelines to avoid penalties.
Types of Hospital Waste
1. Non-Hazardous Waste
- Includes general waste from kitchens, wards, laboratories, and offices.
- Example: Paper, wrappers, stationery, food waste.
2. Hazardous/Risk Waste
- Includes potentially infectious and toxic waste.
a) Potentially Infectious Waste
- Human anatomical waste: Tissues, organs, body parts.
- Items contaminated with body fluids: Blood, pus, laboratory samples.
- Sharps & Needles: Hypodermic needles, syringes, scalpels, razors, surgical instruments.
b) Potentially Toxic Waste
- Radioactive Waste: Solids, liquids containing radioactive materials.
- Chemical Waste: Toxic, corrosive, flammable substances.
- Pharmaceutical Waste: Expired or unused drugs.
Decontamination & Disposal of Hospital Waste
1. Puncturing/Mutilation
- Disposable items (gloves, syringes, IV bottles, catheters) must be punctured before disposal.
- Needles & Syringes should be cut using a syringe cutter.
2. Chemical Decontamination
- Bleach Solution: 10 gm bleach per 1 liter of water.
- Hypochlorite Solution: At least 1% concentration.
3. Deep Burial
- Used for biomedical waste that cannot be incinerated.
Dilution of Chlorine Releasing Compounds
| Available Chlorine | Required Chlorine | Sodium Hypochlorite Solution (5%) | Calcium Hypochlorite (70%) |
|---|---|---|---|
| Clean Condition | 0.1% | 20 ml/Liter | 14 gm/Liter |
| Dirty Condition | 0.5% | 100 ml/Liter | 7 gm/Liter |
Waste Segregation
What is Waste Segregation?
Waste segregation is the process of separating different types of waste at the source to reduce risks and handling costs. It helps prevent infections and ensures safe disposal.
Importance of Segregation:
- Separates infectious/toxic waste from non-infected/non-toxic waste.
- Reduces the chances of infection.
- Lowers treatment and disposal costs.
- Ensures proper biomedical waste management.
Key Guidelines for Biomedical Waste Segregation:
- Biomedical waste must not be mixed with other waste.
- It should be separated into labeled containers/bags at the point of generation.
- Segregation at the source prevents infections and injuries.
- Waste is categorized into different colored containers based on disposal methods.
Categories of Biomedical Waste & Disposal Methods:
| Category | Waste Type | Disposal Method |
|---|---|---|
| 1 | Human anatomical waste | Incineration, deep burial |
| 2 | Animal waste | Incineration, deep burial |
| 3 | Microbiology & Biotechnology waste | Autoclaving, microwaving, incineration |
| 4 | Waste sharps (needles, syringes, blades, etc.) | Chemical disinfection, autoclaving, shredding |
| 5 | Discarded medicines & cytotoxic drugs | Incineration, secured landfill |
| 6 | Soiled waste (cotton, dressings, blood-contaminated items) | Incineration, microwaving, autoclaving |
| 7 | Solid waste (tubing, catheters, IV sets) | Chemical disinfection, autoclaving, shredding |
| 8 | Liquid waste (from labs, cleaning, disinfection) | Chemical treatment, drain disposal |
| 9 | Chemical waste (disinfectants, insecticides) | Chemical treatment, secured landfill |
Biomedical Waste Color Coding:
Why is Color Coding Important?
- Helps in proper waste segregation at the source.
- Reduces risk of infection and contamination.
- Ensures safe disposal and treatment of waste.
Color Coding System for Biomedical Waste
| Color Code | Type of Container | Waste Category | Treatment & Disposal |
|---|---|---|---|
| Yellow | Plastic bags | Human & animal waste, biological waste, solid waste (Cat. 1, 2, 3, 6) | Incineration, Deep burial |
| Red | Disinfected container/plastic bags | Microbiological & soiled waste, solid waste (Cat. 3, 6, 7) | Autoclave, Microwave, Chemical treatment |
| Blue/White/Transparent | Puncture-proof container/bags | Waste sharps, solid waste (Cat. 4, 7) | Autoclave, Microwave, Chemical treatment, Shredding |
| Black | Plastic bags | Discarded medicines, cytotoxic drugs, incineration ash, chemical waste | Secured landfill disposal |
| Green | Plastic container | General waste (office, food, garden waste) | Secured landfill disposal |
Key Points to Remember
- Yellow Bag: Used for highly infectious waste like anatomical waste, body parts, placentas, and blood-soaked items.
- Red Bag: For contaminated plastic waste like syringes, IV tubes, catheters, and gloves.
- Blue/White Bag: For sharp objects like needles, blades, and broken glass.
- Black Bag: For non-infectious dry waste and chemical waste.
- Green Bag: For general waste like food and office waste.
Storage, Transportation, and Treatment of Biomedical Waste
1. Storage of Biomedical Waste
- Definition: Holding biomedical waste temporarily before treatment and disposal.
- Storage Time Limit:
- Big hospitals: 8-10 hours
- Other healthcare institutions: Up to 24 hours
- Maximum limit: 48 hours (Beyond this, permission from authorities is required.)
- Storage Guidelines:
- Waste must be labeled with ward/room details for traceability.
- Storage areas should have caution signs to prevent mishandling.
2. Transportation of Biomedical Waste
- Within the Hospital:
- Use wheeled trolleys, containers, or carts exclusively for biomedical waste.
- Daily cleaning of transport equipment is mandatory.
- Offsite Transportation:
- Bags should be sealed properly to prevent leakage/spillage.
- Infectious/toxic waste must be transported separately from municipal waste.
- A signed document by a nurse/doctor should accompany the waste, noting:
- Date, Shift, Quantity, Destination
- Vehicles must:
- Display the biohazard symbol.
- Have name and address of the carrier.
- Be easily cleanable with rounded corners.
3. Treatment of Biomedical Waste
Treatment: A process that changes the physical, chemical, or biological characteristics of waste to make it non-hazardous.
| Treatment Method | Process | Waste Type |
|---|---|---|
| Incineration | Controlled burning at 982°C – 1093°C | Infectious, pathological, cytotoxic waste |
| Deep Burial | Waste is buried in a 2m deep pit, covered with lime & soil | Anatomical waste, microbiological waste |
| Autoclaving | Steam sterilization under high pressure & temperature | Infectious plastic waste, microbiological waste |
| Microwaving | Uses moist heat & steam to disinfect waste | Pathological & infectious waste |
| Irradiation | Uses gamma radiation (Cobalt-60) to kill microbes | Sharps, microbiological waste |
| Chemical Treatment | Disinfection with sodium hypochlorite, chlorine dioxide, hydrogen peroxide | Liquid waste, chemical waste, sharps |
| Shredding & Destruction | Physically breaks down waste into small particles | Plastic waste, sharps |
| Secured Landfill | Waste is buried safely to prevent environmental contamination | Discarded medicines, chemical waste |
Hazards of Health-Care Waste:
1. What is Health-Care Waste?
- It includes general waste and hazardous waste.
- If infectious waste mixes with general waste, all waste becomes infectious.
- Improper disposal can spread infections and increase harmful microbes.
2. Who is at Risk?
People exposed to hazardous health-care waste include:
- Health workers: Doctors, nurses, hospital staff, and maintenance workers.
- Support workers: Laundry staff, waste handlers, and transport workers.
- Patients and visitors: In hospitals or receiving home care.
- Waste disposal workers: Those working in landfills or incinerators.
3. Types of Hazardous Health-Care Waste
| Type of Waste | Examples |
|---|---|
| Sharps | Needles, scalpels, blades |
| Genotoxic Waste | Cytotoxic drugs, genotoxic chemicals |
| High Heavy Metal Waste | Batteries, broken thermometers, BP gauges |
| Chemical Waste | Lab reagents, disinfectants, solvents |
| Pathological Waste | Body parts, blood, other fluids |
| Pressurized Containers | Gas cylinders, aerosol cans |
| Infectious Waste | Lab cultures, isolation ward waste, tissues |
| Pharmaceutical Waste | Expired or unused medicines |
4. Health Hazards
- Infectious Waste & Sharps: Causes infections like skin, respiratory, and gastrointestinal diseases. Pathogens enter through cuts, inhalation, or ingestion.
- Chemical & Pharmaceutical Waste: Can cause poisoning, burns, and injuries from toxic, flammable, or reactive chemicals.
- Genotoxic Waste: Exposure may happen through inhalation, skin contact, or ingestion, leading to severe health effects.
- Radioactive Waste: Can cause dizziness, vomiting, and serious genetic damage due to radiation exposure.
5. Prevention & Safe Disposal
- Proper segregation: Keep infectious waste separate from general waste.
- Safe handling & storage: Use protective gear and follow disposal guidelines.
- Proper disposal: Use incineration, landfill, or chemical treatment as needed.
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