Community medicine chapters
Hospital waste management
The types of hospital waste (risk and non-risk), the dangers of poor handling, the waste management team and plan, and the steps from segregation to disposal, with the colour coding taught for Pakistan.
- Hospital waste is non-risk (like household waste, the large majority, about 75–90%) or risk waste (infectious, pathological, sharps, pharmaceutical, chemical, genotoxic, radioactive), about 10–25%.
- The key step is segregation at the point of generation; as taught for Pakistan, non-risk waste in blue, risk waste in yellow bags, and sharps in yellow puncture-proof boxes, sealed when three-quarters full.
- Risk waste is treated mainly by incineration (or autoclaving and secure landfill); waste should not be stored for more than 24 hours.
On this page
Overview
Hospital (healthcare or biomedical) waste is any waste produced by healthcare facilities, laboratories and research centres.
Poor handling spreads hepatitis B, hepatitis C and HIV (through needlestick injuries and reuse of syringes), pollutes air, soil and water, and offends the public. In Pakistan, hospital waste is regulated by the Hospital Waste Management Rules, 2005, made under the Pakistan Environmental Protection Act 1997, with provincial updates.
How much waste?
Excel's teaching for Pakistan: large hospitals generate about 0.5–2 kg of waste per bed per day, of which about 0.1–0.5 kg is risk waste.
WHO estimates that about 75–90% of healthcare waste is non-risk (general) and 10–25% is hazardous.
Most hospital waste is non-risk. Proper segregation stops the small hazardous fraction contaminating the rest, which keeps costs and risks down.
Types of waste
Non-risk (general) waste
Comparable to household waste: paper, cardboard, packaging, food waste, plastic bottles from non-clinical areas.
Risk (hazardous) waste
| Type | Examples |
|---|---|
| Infectious | Cultures and stocks from labs, waste from isolation wards, dressings and swabs soaked with blood, dialysis waste |
| Pathological | Tissues, organs, body parts, fetuses, blood and body fluids, placentas |
| Sharps | Needles, syringes with needles, scalpels, blades, broken glass, infusion sets |
| Pharmaceutical | Expired or unused drugs, vaccines and sera; contaminated vials |
| Chemical | Lab reagents, disinfectants, solvents |
| Heavy metals | Mercury from broken thermometers and BP apparatus; cadmium from batteries |
| Genotoxic (cytotoxic) | Anticancer drugs and materials contaminated with them; excreta of patients on these drugs |
| Radioactive | Material contaminated with radionuclides from nuclear medicine and radiotherapy |
| Pressurised containers | Gas cylinders, aerosol cans (risk of explosion if burnt) |
Sharps cause the most injuries and carry the greatest risk of blood-borne infection (hepatitis B, C and HIV) for health workers and sanitary staff.
Organisation
- The head of the hospital (medical superintendent) is responsible and forms a Waste Management Team (WMT), including heads of departments, the infection control officer, chief pharmacist, radiology officer, hospital engineer and administrator.
- A Waste Management Officer (WMO) develops and runs the Waste Management Plan (WMP): a plan of the hospital showing disposal points, the number and type of containers, collection routes and timings, storage, treatment and disposal, staff training, and emergency procedures for spills and injuries.
Steps in waste management
1. Segregation (the most important step)
Separate risk from non-risk waste at the place where it is produced (bedside, operating theatre, labour room, laboratory).
Colour coding as taught in Excel for Pakistan:
| Waste | Container | Colour | Destination |
|---|---|---|---|
| Non-risk waste | Container lined with a strong plastic bag | Blue | Municipal landfill |
| Risk waste | Container lined with a strong, leak-proof plastic bag | Yellow | Incineration or secure landfill |
| Sharps | Sealable, puncture- and leak-proof box or drum, marked "Danger: contaminated sharps" | Yellow | Incineration or secure landfill |
- Bags and sharps boxes are sealed when three-quarters full, labelled and replaced at once.
- The full sharps box goes into a yellow bag with other risk waste.
- Do not recap needles; use needle cutters or destroyers where available.
- Large amounts of pharmaceutical and chemical waste are returned to the supplier or sent for specialised treatment.
Seal waste bags and sharps containers when 3/4 full. Never overfill or empty a sharps container.
Colour codes differ between countries and are updated (for example India uses yellow, red, white and blue categories). In MCQs, follow the Pakistan rules and your textbook; in practice, follow your hospital's current policy.
2. Collection
- Waste must not pile up where it is produced; collected at least daily, on fixed routes.
- Sanitary staff must be immunised against hepatitis B and wear protective clothing: heavy-duty gloves, industrial aprons, boots, masks and eye protection.
3. Transportation
- On site: dedicated wheeled trolleys, easy to clean, used only for waste; risk and non-risk waste kept separate.
- Off site: by the municipal authority or licensed contractor, in enclosed vehicles; risk waste carried separately.
4. Storage
- A separate, secure area within the hospital, with an impermeable floor, easy to clean, protected from animals and away from food areas.
- Risk waste should not be stored for more than 24 hours (longer only with cold storage).
5. Treatment and disposal
| Method | Notes |
|---|---|
| Incineration | High-temperature burning; greatly reduces volume and weight; suitable for infectious and pathological waste. Needs proper design and emission control (double-chamber incinerators); not for pressurised containers, large amounts of heavy metals or radioactive waste |
| Autoclaving (steam) | Sterilises infectious waste and sharps before landfill or recycling; no smoke |
| Microwave treatment | Disinfects shredded infectious waste |
| Chemical disinfection | For example hypochlorite for liquid waste and some sharps |
| Encapsulation | Sharps or drugs sealed in a container with cement or foam, then buried |
| Secure (sanitary) landfill | For treated risk waste and ash; lined pits away from water sources |
| Deep burial | Small rural facilities only, for anatomical waste |
| Inertisation | Mixing pharmaceutical waste with cement and water |
Incineration is the classic method for infectious and pathological waste. Waste with heavy metals (mercury) and radioactive waste must not be incinerated.
Hazards to health
- Injuries and infections from sharps: hepatitis B, hepatitis C, HIV.
- Reuse of syringes scavenged from waste, a major cause of blood-borne infection spread in Pakistan.
- Chemical and drug toxicity; genotoxic effects; radiation injury.
- Air pollution (dioxins and furans) from poorly run incinerators.
- Public offence, especially with anatomical waste.
Expect: risk vs non-risk waste and their proportions, examples of each risk category, segregation as the most important step, the Pakistan colour coding (blue, yellow, yellow sharps box), the 3/4-full rule, 24-hour storage limit, the waste management team and officer, and which disposal method suits which waste.
Quick revision
- Non-risk 75–90%; risk 10–25%.
- Risk: infectious, pathological, sharps, pharmaceutical, chemical, heavy metal, genotoxic, radioactive.
- Segregation at source is the most important step.
- Pakistan teaching: blue non-risk, yellow risk, yellow puncture-proof sharps box.
- Seal at 3/4 full; collect daily; store no more than 24 hours.
- Incinerate infectious and pathological waste; not mercury or radioactive waste.
Written by The House Job from Excel Community Medicine and Park's Textbook of Preventive and Social Medicine (named in the UHS PGET syllabus), with reference to Pakistan's Hospital Waste Management Rules 2005 and WHO guidance. Always follow your hospital's current waste policy.
FAQ
What is the most important step in hospital waste management?
Segregation of risk and non-risk waste at the point where it is produced.
What colour bag is used for risk waste in Pakistan?
Yellow bags are used for risk (infectious) waste, with yellow puncture-proof containers for sharps, according to Pakistan teaching and rules.
When should a sharps container be closed?
When it is three-quarters full.
Which wastes should not be incinerated?
Pressurised containers, wastes with large amounts of heavy metals such as mercury, and radioactive waste.