Incineration to Plasma Pyrolysis: Machines That Safeguard Public Health
- Dr. Sanjay Joshi

- Aug 29
- 3 min read
Effective treatment is the shield that prevents biomedical waste from turning into a public health disaster.

In the earlier stages of biomedical waste management, we saw how waste is first segregated into colour-coded bags at the point of generation and then carefully collected and transported under strict safety measures. These steps are vital to prevent accidental exposure and to ensure that different categories of waste reach their respective processing streams without mixing. But segregation and transport alone do not neutralise the dangers hidden in biomedical waste.
It is now the operator’s job to further ‘treat’ this waste as per the protocols and specifications described in the BMW Management Rules of 1998 and 2016.
Treatment is essential to get rid of all the deadly infectious pathogens that are lingering in the tissues and fleshy parts, amputated parts, materials soaked in the blood and other body fluids, etc. Such pathogens that have been lying dormant in these organs and tissues for a long time might be waiting eagerly for an opportunity to spring back and invade and infect the healthy human body. So before they get such an opportunity, destroy them! That is the whole purpose of treatment at CBWTF. There are different types of equipment and machines used for treatment. The following is a brief introduction to these machines.
Incinerator: Incineration is a thermal process that transforms medical waste into inorganic, incombustible matter, thus leading to a significant reduction in waste volume and weight. The main purpose of any medical waste incinerator is to eliminate pathogens from waste and reduce the waste to ashes. However, certain types of medical waste, such as pharmaceutical or chemical waste, require higher temperatures for total destruction.
Medical waste incinerators typically operate at high temperatures between 900 and 1200°C. Developing countries like India usually use low-cost, high-temperature incinerators of simple design for the stabilisation of healthcare waste. The most reliable and predominant medical waste incineration technology is pyrolytic incineration, also known as controlled air incineration or double-chamber incineration. The pyrolytic incinerator comprises a pyrolytic chamber (primary chamber) and a post-combustion chamber (secondary chamber).
Most of these incinerators are diesel-fired. These incinerators are specifically used for treating the contents of yellow bags. These bags containing incinerable waste are loaded in the pyrolytic chamber through a front-opening door either manually or using a conveyor belt. In this chamber, the waste is thermally decomposed through an oxygen-deficient, medium-temperature combustion process with temperatures ranging between 800 and 900°C, producing solid ashes and gases. The gases produced in the pyrolytic chamber are burnt at high temperatures ranging between 900 and 1200°C by a fuel burner in the post-combustion chamber or secondary chamber using an excess of air to minimise smoke and odours. The flue gases from the secondary chamber then pass through air pollution control devices such as a venturi scrubber for complete elimination of particulate matter, if any. Finally, the smoke is released into the air through a 100-foot-tall stack or chimney. The ash is transported to a landfill for deep burial. Advantages of this technology include a relatively lower and affordable cost and almost a 99 per cent reduction in the volume of the waste being treated. In the past few years, technologically advanced incinerators have been manufactured in India that aim for zero pollution through emission.
Plasma Pyrolysis: This system uses a plasma-arc torch to generate the plasma energy, which can generate heat reaching temperatures as high as 1650°C to 11000°C. However, this is a relatively new technology and has very little track record. While some specific pyrolysis technologies show promise, others have not achieved performance and emission levels claimed by manufacturers, and others have not worked at all.
Whether through proven methods like incineration or newer approaches such as plasma pyrolysis, the ultimate goal remains unchanged: to eliminate pathogens, safeguard public health, and ease the environmental burden of biomedical waste. I will be exploring more technologies in my next article. Until then, wishing you a safe and healthy weekend.
(The author is an environmentalist.)





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