Treatment technologies play an important role in protecting human health and maintaining environmental quality. In the context of health care waste management, treatment refers to the processes used to reduce the volume, toxicity, infectiousness or hazardous nature of waste before its final disposal. Different technologies have different effects on human health and the environment. If properly selected, operated and monitored, they can significantly reduce health risks. However, inappropriate treatment, poor maintenance or unsafe handling may create new hazards through toxic emissions, contaminated residues, occupational exposure and environmental pollution. Incineration is one of the traditional technologies used for treating infectious, pathological and certain pharmaceutical wastes. It involves combustion at high temperatures and can substantially destroy microorganisms and reduce the volume of waste. From a public-health perspective, effective incineration reduces the risk of transmission of infectious diseases through contaminated materials. It also makes anatomical waste unrecognisable and destroys many hazardous organic substances. However, the health benefits depend heavily on the design and operating conditions of the incinerator. Incomplete combustion can produce smoke, particulate matter, carbon monoxide and other harmful pollutants. Burning chlorinated plastics and certain chemical materials can generate toxic substances such as dioxins and furans. Long-term exposure to such pollutants may contribute to respiratory disease, cardiovascular problems, developmental effects and increased cancer risk. Therefore, modern incinerators require appropriate temperature control, air-pollution control systems and trained operators. Autoclaving is a widely used non-burn treatment technology for infectious health-care waste. It uses saturated steam under pressure to destroy microorganisms. Autoclaving generally has fewer harmful air emissions than incineration and therefore reduces the risk of atmospheric pollution. Properly treated waste presents a much lower risk of infection to waste handlers and the surrounding community. It is particularly useful for contaminated dressings, laboratory waste and certain plastic materials. However, autoclaving does not destroy all types of hazardous substances. Chemicals, pharmaceutical waste and some cytotoxic materials may remain hazardous after treatment. If treated waste is not properly shredded or rendered unrecognisable, there may still be risks of reuse or accidental exposure. The process also requires appropriate temperature, pressure and exposure time; inadequate treatment may leave infectious microorganisms alive. Microwave treatment is another non-burn technology that uses electromagnetic energy to generate heat and disinfect infectious waste. Its major health advantage is effective microbial destruction without the large-scale combustion emissions associated with conventional incineration. It can reduce the infectious nature of waste and consequently protect health-care workers, waste collectors and the public. Nevertheless, microwave treatment requires segregation of unsuitable materials and adequate moisture for effective heating. Improper operation can result in incomplete disinfection. Workers may also face occupational risks from handling untreated waste before processing. Hence, appropriate protective equipment, monitoring and maintenance are essential. Chemical disinfection uses substances such as chlorine compounds, hydrogen peroxide or other disinfectants to destroy