Gustav Melin, chief of Swedish Bioenergy Association has said that 25 years ago there was the problem of dioxin when burning the waste. But as the technology improved, dioxin is not a problem in Sweden and even in the European Union countries.
"The new technology and equipment have solved this problem," Melin said at the end of the World Bioenergy-Clean Vehicles and Fuel Conference in Stockholm recently.
According to the European Union standard, waste must be burned at 850 degrees lasting two seconds. Through this process, most of the dioxin is destroyed and a small part which exists can be cleaned and wiped through a cleaning process together with the smoke.
An expert with Swedish International Biogas company said the burner in the past sent out the smoke directly without experiencing a cleaning process. Nowadays, the advanced equipment has three parts of dealing with waste burning, cleaning and lowing the temperature. Therefore, dioxin disappeared when the smoke comes out.
Sweden burns 4.5 million tons of waste a year and each person produces about one ton waste.
Sweden is one of the most advanced countries in sorting out waste. Statistics show that 48% of the wastes go back to factories for raw material, 3% goes to the landfill and 49% of the waste are burned to produce electricity, heat for district heating and construction materials. Organic part of the waste goes to biogas factories to produce biogas.
By Xuefei Chen, People's Daily online, Stockholm.
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