South Korea has achieved economic growth at an astonishing rate in the last 50 years, and the greater wealth brought by the countrys rapid development has prompted people to consume more commodities and then throw them away.
Nearly 90 percent of the waste was sent to landfills two decades ago, forcing the country to embark on a search for new solutions to deal with waste.
Now, the country has turned its eyes to plenty of new technologies that transform waste into resources. Turning waste into energy has been at the forefront of the green movement that has taken off under the Lee Myung-bak administration that emphasizes "low carbon, green growth."
Energy production from waste has indeed emerged as the most efficient and cost-effective method to realize the goal of "low carbon, green growth."
Currently, more than 76 percent of new and renewable energy is generated from waste, and the manufacturing cost of renewable energy is only about 10 percent of that of solar energy and 66 percent of that of wind energy, according to the Ministry of Environment. Since 2007, the environment ministry has gradually increased government subsidies on expanding power generation facilities from waste.
One of those facilities is situated where used to be Seouls landfill site for 15 years. Mapo Resource Recovery Plant is a state-of-the-art resource incineration facility that cost over 171 million U.S. dollars and opened in 2005.
Located between two parks in western Seoul and built on two former mountain landfill sites, the facility now deals with waste from five of Seouls 25 districts, processing an average of 650 tons of waste each day.
To put it simply, waste is transported to Mapo Resource Recovery Plant, burned at extremely high temperatures, and the heat is used to generate energy in the form of electricity or steam.
Heat generated by the incinerator goes to neighboring Korea District Heating Corporation and is consumed to heat 20,000 homes in the Mapo area of Seoul. Though the incineration process is typically unpopular due to the risk of discharging highly toxic emissions, the facility is capable of destroying most dioxins and other harmful gases with high temperature and retention time in the incinerator.
The area, where the facility is located, was once a landfill site called Nanji Island, which contained about 92 million tons of garbage.
Nanji Island posed a serious environmental problem as it overflowed with trash and produced methane gas and toxic water. City authorities halted the dumping of trash at Nanji Island in 1993 and transformed it into a so-called ecology park by covering waste with a one-meter layer of impermeable plastic liners and then topping off with soil.
Kim Dong-sik, site manager of Mapo Resource Recovery Plant, stressed the importance of recycling to facilitate waste-to-energy practices.
"Recycling can be the basis of resource recovery. If we dont recycle, incineration becomes difficult and demands the use of auxiliary fuel. Recycling offers optimal conditions for waste to generate heat," said Kim.
Next to Mapo Resource Recovery Center is a hydrogen-fueling station that develops hydrogen from methane from landfill gas.
There are three more hydrogen fueling stations in Seoul, but what sets this station apart from others is that it transforms landfill gas into a clean form of renewable energy. The three stations either rely on city gas or LPG (Liquefied Petroleum Gas) as the main component to generate fuel.
It is the first station of its kind in the world to extract hydrogen from methane as a clean fuel source. The hydrogen station, which started its operation in June this year, draws upon methane that is produced by decomposing waste at the former landfill site, Nanji Island.
source: APEC-VC Korea
