CASE STUDY

Turning Municipal Waste into Energy

The facility is one of Seoul’s four Resource Recovery Centers, where energy can be generated through waste incineration.  Photo credit: Seoul Urban Solutions Agency.
The facility is one of Seoul’s four Resource Recovery Centers, where energy can be generated through waste incineration. Photo credit: Seoul Urban Solutions Agency.

In Seoul, 90% of landfill-bound wastes were instead used to produce energy enough to heat 518,000 households.

Overview

A rapidly growing population, improving standards of living, and increasing consumption levels have contributed to a steep rise in Seoul’s waste generation.

When the existing landfill space neared its capacity limit, it was urgent for Seoul—Republic of Korea's capital and its largest city—to find a solution for its mounting waste problem. Seoul implemented a clean incineration measure by setting up resource recovery facilities. The facilities do not only burn solid waste but also generate renewable energy for the city.

This case study was adapted from Turning Waste into Energy: Resource Recovery Facility, part of a series of briefs on Waste Management published by the Seoul Urban Solutions Agency.

Challenges

Limited landfill space became a challenge to Seoul’s waste management. The growing population coupled with the people’s higher standard of living and consumption level translated into a steep rise in the city’s waste generation.

Context

As early as the 1980s, Seoul saw an urgent need to manage the city’s wastes as its existing landfill space neared its capacity limit. The goal was to develop a clean, sustainable alternative to burying its waste. It wanted to reduce the amount of waste going to a landfill, and to find innovative ways to put its waste to good use.

Solutions

Seoul’s choice was clean incineration which not only burns solid waste but also generates renewable energy in the process. Starting with the Yangcheon Resource Recovery Facility in 1996, four such facilities were built over a decade. The four resource recovery facilities are now capable of dealing with 2,850 metric tons of solid waste every day, with each resource recovery accepting non-recyclable solid waste from a number of adjacent districts.

As the name highlights, resource recovery facilities are more than simple trash burners. The idea is to recover valuable energy resources from waste. State-of-the-art incinerators burn solid waste at 850-950℃ and produce heat energy that is used to provide heating for the surrounding area and to generate clean electricity.

Even bottom ash, the non-combustible residue from incineration, also finds its use as a recycled construction material.

Numbers and facts

4 resource recovery facilities built from 1996 to 2006
2,850 metric tons daily capacity of the four facilities
90% reduction in waste going to landfill since 1996
518,000 households heated with energy generated by the facilities
60,000 metric tons greenhouse gas reduction per year

Results

Less waste for landfill

Since 1996, the amount of waste from Seoul going to landfill has fallen by almost 90%. Over the same period, clean incineration has increased by three to four times, replacing 30% of waste that would have ended up in the landfill.

Energy from waste

The four facilities across Seoul generate enough energy to provide heating for 518,000 households. This renewed supply of heating energy reduces over 60,000 metric tons of greenhouse gas emissions every year by replacing liquefied natural gas.

Steam from incineration is also used to generate clean electricity which is fed back into the national power grid. Two facilities have gone further with on-site solar panels for power generation.

Clean waste management

Over 50% of construction costs for resource recovery facilities were dedicated to installing cutting-edge equipment for filtering and removing pollutants. Regular inspection of flue gas shows all four facilities emitting only a small fraction of legal standards for pollutant emission.

Lessons

It was important to build public consensus and overcome the “not in my backyard” mentality of residents who did not want to have one of the recovery facilities built in their areas.

Public consultations

Seoul held more than 600 resident consultations over a decade to garner public support for resource recovery facilities against widely-held fears about the negative impact of incineration. For each facility, residents in the area are invited to form a citizen’s council to monitor the facility’s operation and discuss the terms of community incentives.

Community incentives

In return for hosting resource recovery facilities in their neighborhood, residents living within 300 meters from the facilities receive various benefits such as a discount on their electricity bill, housing maintenance subsidy, medical support, and the use of public space on facility sites for public education and entertainment programs.

Full disclosure of operations

From waste intake to emission rates, every aspect of facility operation is meticulously monitored around the clock. Real-time emission data from the facilities are made public through display boards on the site and websites.

Display boards show operational information such as emissions at the Resource Recovery Centers, keeping residents informed and the city government accountable. Photo credit: Seoul Urban Solutions Agency

Resources

Seoul Urban Solutions Agency. Turning Waste into Energy: Resource Recovery Facility. Seoul.

Urban SDG Knowledge Platform. Waste Heat Recovery Project.

Ask the Expert

  • Seoul Urban Solutions Agency

    The Seoul Urban Solutions Agency (SUSA) was established by the Seoul Metropolitan Government to share its urban development experiences with other cities seeking to become sustainable and smart urban domains. Through a wide network of partnerships with the public and private sectors within and outside the Republic of Korea, SUSA works to connect and leverage its wide range of knowledge and resources to assist in solving the development challenges of its partner cities. 

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   Last updated: August 2019



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