Sponge city elements impress with simplicity and efficiency. At the same time, they must fit to the specific local situation. Hence, a general design catalog helps planners to develop a suitable stormwater concept and particular sponge city elements. Several typical Sponge City elements are applied in Germany since the 1990s. In China, starting with 16 pilot cities in 2015, and 14 more in 2016, Sponge City Implementation has become one main method to deal with the urban water management issues. In Tongzhou District, Beijing, the implementation of Sponge City facilities is planned on 16 sub-catchments. Some of the already planned or realized Sponge City concepts will be reviewed and the the German partners will provide suggestions for optimization or upon special issues. For the newly started or not started catchments in Tongzhou, the German partners will support the Chinese planners with ideas and recommendations regarding concept and design. Overall, based on the specific conditions in China, a comprehensive catalogue of sponge city elements is to be developed by the German side. Alongside, the feasibility of transferring German sponge city design experience into Chinese conceptions will be evaluated.
The Luofang WWTP is located in the Luohu District of Shenzhen City, China. Shenzhen Water Group treatment facility is being faced with the need to treat an increased hydraulic and biological load and meet more stringent regional discharge limits. In cooperation with Chinese partners, Harbin Institute of Technology (HIT) and HIT Shenzhen, the MBR-Demonstration in Project KEYS aims to promote the demand-based implementation of eco-sensitive and particularly energy-efficient wastewater treatment methods featuring new approaches like membrane processes and worm reactor (based on nematodes) in China.
The German partner Martin Systems (MS) provides two pilot MBR plants (each 14 m³/d) for the demonstration at Luofang WWTP. Chinese Partner HIT will provide a pilot scale worm reactor in combination of German MBR-technology. The pilot-scale system will be tested and validated at WWTP Luofang for at least six months. From a scientific point of view, Kompetenzzentrum Wasser Berlin (KWB) and HIT’s activities comprise the efficiency analysis of MBR and the combination effect of MRB and worm reactor.
The close cooperation with the Chinese research partners in this particular field is expected to yield a considerable knowledge growth for all parties involved.
MBR Pilot Plant on wwtp Luofang, Shenzhen (photo credit: Kuangxin Zhou)