Around 60 000 tonnes WEEE per year are produced in the special administrative region of Hong Kong with its 7.3 mill. inhabitants. These include equipment contaminated with toxic substances such as mercury or CFCs, but which also contain valuable raw materials at the same time. In times of raw materials scarcity and progressing environmental pollution, China, too, has to take new approaches. Therefore with the help of state-of-the-art systems that are operated in compliance with the latest statutory requirements, the ECO Park in Tuen Mun is to take a pioneering role in the region and serve as a model for other Asiatic centres. Furthermore, a visitor centre has been set up to give interested Hong Kong citizens and tourists the opportunity to find out about recycling technology and to view the plants live in production operation. Erdwich was contracted as an experience expert in plant engineering for comminution technology by the ALBA Group to supply processing lines for the major project and install these on site. Split into three consignments, the eight recycling lines were sent in 76 containers on the 18 544-km-long sea voyage to Hong Kong, where at times 24 employees of Erdwich were present to take receipt of the machines and equipment and install them.
Challenging conditions on site because of installation during hall construction
“The biggest challenge in the installation of the equipment was that we had to build our machines while the construction of the halls was not yet complete,“ reports Harald Erdwich, Managing Director of Erdwich Zerkleinerungs-Systeme GmbH. Further obstacles were caused by the complex bureaucratic procedure at the construction site in which every single work step was overseen and checked by the Hong Kong authorities. For some of the installation work, special certificates were necessary, and the Erdwich team was trained by the construction management on site. “That meant an additional time commitment that we had to take into consideration in our work planning,” adds Erdwich.
Adaption of the shredder technology to the specific task
“As LCD screens and tube TVs, different types of refrigerators and air conditioning systems, but also washing machines and general WEEE are contained in the waste mass, we had to apply different technologies to meet all requirements,” continues Erdwich. With two lines that are designed with robot technology for the recycling of LCD monitors, up to 60 items of equipment per hour can be shredded. For tube imaging devices, Erdwich also supplied two lines in which the monitors are processed by means of sawing technology. For air conditioning and refrigerator recycling, a total of three lines are used, each with a throughput rate of 40 items of equipment per hour. The recycling line for WEEE, like, for example, washing machines or dryers, but also vacuum cleaners and toasters, shreds around five tonnes material per hour when working at full capacity. The special feature of the total plant is that the material streams can be conducted such that further separation and processing steps can be optionally activated. From this results an increased purity of the yielded fractions and material quality, which can bring higher value creation.
“Finally, we were able to complete all parts of the plant by the agreed date and commission these bit by bit after approval by the authorities and hand over the plant to the plant operator. We are very proud that thanks to the dedication of our experience team, we as an SME managed to deliver such a large and complex order,” concludes Erdwich.