Chinese Waste to Be Treated with European Technology

A pre-treatment plant for household waste was ordered for the south-east of China from the Austrian-German technology firm Redwave.

By using mechanical biological treatment (MBT), it will dry and sort the waste for a local waste-to-energy (WTE) plant. The capacity of the facility will amount to 650,000 tons annually respectively 1,800 tons per day. The purchaser of the plant is a private Chinese waste and energy group. The facility will be erected in the province of Shandong with the start of operation scheduled for early 2018.

The facility is the second one the company will deliver to China. According to Redwave, it received its first Chinese order for an MBT near Shanghai in late 2015. It will process 270,000 tons of household waste per year.

The two waste processing plants in China will contribute to the solution of a country-specific problem: In many Chinese provinces, household waste is very high in moisture and thus low in heating value. It does not burn independently in waste incinerators without supportive co-firing of coal. So the first step in the mechanical biological treatment is a process called biological drying. The second step is the mechanical treatment: Recycable fractions like ferrous and non-ferrous metals are recovered from the dry matter. Also, incombustible, inert contraries like glass, sand, stones and pottery are separated. All combustible waste components like plastics, wood, paper, cardboard and other organics are processed to a so-called refuse derived fuel (RDF) with a sufficient heating value. It will be used in a nearby combined heat and power plant which employs circulating fluidised bed technology (CFB). CFB furnaces are very efficient but require a more homogenous and further preprocessed waste than traditional grate furnaces. Both MBT plants will be operated fully automated.

“Until now, the new project is the largest individual order for the firm,” the Austrian-German company reported. “Furthermore, it will be the largest suchlike MBT project in China. Amongst other components, four sensor-controlled Redwave classifiers will be installed. They will increase the efficiency of the RDF recovery in the mechanical sorting.”

Graphic: Redwave