Waste to energy incinerator (WTE)

Why in news?

A recent investigative report by the New York Times on Delhi’s Waste-To-Energy (WTE) incinerators, said that it makes more harm than its benefits.

What is waste to energy incinerator?

• Waste-to-energy incinerator – It is a facility to burn municipal solid waste (trash) at high temperatures to generate heat which is then used to produce steam, powering a turbine to generate electricity.
• Waste type – Typically handles municipal solid waste (MSW) from household waste and commercial waste, in urban areas.
• Significance – It is essentially a system that converts waste into usable energy through the process of incineration.
• Generates electricity from the solid waste
• Avoids landfilling in large cities
• Recover valuable resources such as metals that can be sent for recycling and kept in the economy.
• Steps involved in this process

What are the issues in WTE Incinerators?

• Lack of proper disposal mechanism – Improper disposal and illegal dumping of ashes produced in the process.
• While this process does generate electricity, it also produces two types of ash,
  • Bottom ash – Comprising about 20-30% of the original waste volume that remains as sediments after combustion.
  • Fly ash – Captured by air pollution control devices, is more problematic due to its concentration of toxic substances in air form.

• Failure to sort waste – Hazardous materials like batteries and e-waste are burned without proper segregation, increasing toxic emissions.

• Release of toxic gases ­– WTE incinerators release toxic gases due to burning unsegregated waste, low calorific value and high moisture content wastes.

• Economic viability – Dependence on carbon credit markets for financing needs will disrupts the project when there is a fall of carbon markets.
• Lack of monitoring and enforcement – Despite rules that prohibit the ash from being dumped in residential areas, open-bed trucks with incinerated trash spread to neighborhoods.
• Public discontent – Protests and lawsuits due to growing health concerns from local communities.

What are the impacts?

• Environmental impacts

• Air pollution – Toxic pollutants like dioxins, heavy metals, and particulate matter, from the smoke billowing and the ashes dumped near homes worsen the air quality.
• Ground water Contamination – Due to the dumping of ashes in open area the groundwater is contaminated.
• Carbon emissions – Incineration of mixed waste produces toxic particles, including carbon monoxide, nitrogen oxides, and Sulphur dioxide due to inefficient burning.
• • High levels of CO₂ and other greenhouse gases negate the "green" claims of WTE plants.
• Health impacts
• Respiratory diseases – The lead and arsenic-laced smoke and ash which contains as many as eight times the permissible levels of heavy metals such as cadmium.
• • Inhalation of pollutants leads to asthma, bronchitis, and other lung ailments.
• Neurological and cardiovascular risks – Long-term exposure linked to nervous system disorders and heart diseases.
• Impact on vulnerable groups – The chemicals and heavy metals in the air and soil can cause birth defects, cancer and other life-threatening conditions in children and old ages.
• Risk in pregnancy – Persistent organic pollutants like Dioxins and Furans released during combustion interfere with hormone regulation and fetal development.
• • In Delhi the area around the plant sees the rise in miscarriages, lesions on their skin.

What lies ahead?

• Strict enforcement of guidelines and rules in handling ashes and air filtration system.
• Adopt safer technologies and invest in waste segregation are crucial for a sustainable solution.
• Decentralized waste management in households and by local communities for sustainable waste management.
• Balanced approach to align energy needs with ecological integrity is essential for India's future.
• Promotion of Co-processing of waste at cement plants as an effective waste management solution.

Reference

1.  New York Times | Green’ Revolution Poisoning India’s Capital
2. The Hindu |Waste-To-Energy Incineration Is Disastrous to Health