Describe the management of biomedical waste with the colour coding and treatment methods.

Definition and Importance

• Only about 15% of hospital waste is hazardous; the remaining 85% is ordinary general waste. segregation AT source is therefore the entire strategy — mixing a small quantity of infectious waste with general waste converts the whole of it into hazardous waste, multiplying the cost and the risk several-fold
• Hazards — injury and infection to waste handlers and sanitary staff (particularly hepatitis B, hepatitis C and HIV from sharps); infection to the community through scavenging and repacking; reuse of disposable syringes and needles after theft from waste, which has caused documented outbreaks of hepatitis in India; environmental contamination with dioxins and furans from incinerating chlorinated plastic; and mercury and cytotoxic drug contamination
• Governed in India by the BIO-medical waste management rules 2016 and their amendments, under the Environment (Protection) Act 1986. Compliance is a legal obligation of the occupier, and authorisation from the State Pollution Control Board is required

Segregation BY Colour Code

Handling, Transport and Treatment

• Bags are filled to no more than three-quarters, then tied, labelled with the biohazard or cytotoxic symbol and with the details of the generating unit, and barcoded as required by the 2016 Rules
• NO untreated biomedical waste may be stored beyond 48 hours
• Transport in covered, labelled, dedicated trolleys and vehicles, by routes avoiding patient and public areas, to a common biomedical waste treatment facility (CBWTF) where one exists — which is the preferred arrangement, since a shared professional facility is safer and cheaper than each hospital operating its own incinerator
• Treatment technologies — incineration at high temperature for anatomical, soiled and pharmaceutical waste (but never for chlorinated plastic); autoclaving and microwaving for infectious plastic and sharps, with validation by chemical and biological indicators; chemical disinfection with 1% hypochlorite for liquid waste; plasma pyrolysis; and deep burial, permitted only for rural facilities without access to a treatment plant
• Liquid waste and effluent must meet discharge standards; laboratory and microbiological liquid waste is disinfected before discharge
• Records and reporting — daily records of waste generated, annual returns to the State Pollution Control Board, and immediate reporting of major accidents

Sterilisation, Disinfection and the Spaulding Classification

• Endoscope reprocessing is a recurring source of outbreaks — the long narrow channels are difficult to clean, and manual cleaning before disinfection is the essential step, since organic material shields organisms from any disinfectant. Duodenoscopes in particular have transmitted carbapenem-resistant organisms internationally
• Environmental cleaning — detergent for routine cleaning; 1% hypochlorite for blood spills, C. Difficile and norovirus; attention to high-touch surfaces (bed rails, door handles, taps, monitors, keyboards); and cleaning validated by direct observation or fluorescent markers rather than assumed

Applied Aspects

• Never recap a needle; recapping is the commonest cause of needlestick injury and is prohibited. The user disposes of the sharp immediately, personally, into a puncture-proof container at the point of use — never handing it to someone else and never leaving it on a trolley
• Do not overfill sharps containers; they are sealed at three-quarters full, and overfilled containers cause injuries to the staff who handle them
• Mutilation and shredding prevent reuse, which is the specific Indian problem the Rules address — intact syringes recovered from waste have been repackaged and resold, causing hepatitis outbreaks
• Train and protect the waste handlers — they carry the greatest risk and the least knowledge. hepatitis B vaccination, tetanus immunisation, gloves, boots and masks are mandatory, and their occupational health is a legal responsibility of the hospital
• Waste management is a legal and environmental duty, not only a clinical one; non-compliance carries penalties, and it is a mandatory requirement for NABH accreditation
• The greatest gain comes from reducing the volume of hazardous waste — by correct segregation, by not using coloured bags for general waste, and by avoiding unnecessary use of disposables; every item wrongly placed in a yellow bag is incinerated at cost and at environmental expense
• Microbiology laboratory waste must be pre-treated on site by autoclaving before it leaves the laboratory; cultures and stocks contain far higher concentrations of organisms than any clinical specimen
• Chlorinated plastic must not be incinerated, which is why red-bag waste goes to autoclaving and recycling; burning polyvinyl chloride generates dioxins, which are persistent carcinogens
• Mercury from broken thermometers and sphygmomanometers is separately collected and never placed in general or biomedical waste; mercury-free devices are the better answer
• Cytotoxic waste requires separate handling and is incinerated at high temperature; spills need a dedicated kit and trained staff
• Placenta and anatomical waste go into yellow bags for incineration or deep burial; cultural expectations about their disposal need to be handled with sensitivity and explained rather than overridden
• Barcoding and annual returns are legal requirements under the 2016 Rules, and non-compliance carries penalties for the occupier personally
• Do not place general waste in coloured bags; this is the commonest error, and it multiplies both the cost and the environmental burden of disposal unnecessarily
• Only about 15% of hospital waste is hazardous, and correct segregation keeps it that way; incorrect segregation converts the whole stream into hazardous waste
• Place the correct bins at the point of generation; a bin in the corridor guarantees mis-segregation, exactly as a distant hand-rub dispenser guarantees missed hand hygiene
• Waste handlers need hepatitis B vaccination and protective equipment as a legal obligation, and they carry more risk than most clinical staff
• Common treatment facilities are preferable to hospital incinerators, which are frequently poorly maintained and operated below the temperatures needed to avoid dioxin formation
• Untreated waste must not be stored beyond 48 hours, and storage areas must be secure against scavenging, which is the route by which sharps re-enter circulation
• Colour coding is worth memorising precisely; it is a standard examination question and, more importantly, a daily practical decision made by every clinician
• Syringes go in red without their needles, and the needles in white — separating them at the point of use is what the needle destroyer or cutter is for
• Glass goes in blue, not in the sharps container, because it is recycled after disinfection rather than shredded
• Expired medicines are yellow-bag waste, not general waste, and must never be returned to the pharmacy shelf or flushed away
• Deep burial is permitted only where no treatment facility exists, and is a rural provision rather than a general option
• Segregation is decided by the person holding the item, which makes training of nurses, attendants and housekeeping staff the whole of the programme
• Reuse of disposables after theft from waste is the specific Indian hazard the mutilation and shredding requirements exist to prevent, and it has caused documented hepatitis outbreaks
• Liquid laboratory waste is disinfected before discharge, and effluent must meet discharge standards; the drain is not a disposal route for cultures
• Annual returns and daily records are legally required, and accreditation depends on them as much as on clinical standards
• Waste management is examinable and practical at once — the colour codes are asked in every examination and used in every clinical shift