Wastewater disposal is currently undergoing a paradigm shift from a disposal management to a resource-oriented approach, where important wastewater components are recovered and reused, and energy consumption is reduced. While initial approaches regarding these topics are being implemented in Germany, further development and adaptation of system components and concepts is required worldwide. The PIRAT Systems project follows the approach of an interdisciplinary teamwork of German and Chinese players (consultants, construction companies, fertilizer processing companies, operators, government agencies and research institutes) to develop selected technologies for the Chinese market and to elaborate, based on investigations on model-wastewater treatment plants (model-WWTP), concepts for increasing energy efficiency and integration of sustainable components. In order to be able to transfer the results of the investigations on model-WWTP to other plants within and outside of China, design approaches and simulation models will be developed as planning tools as well as decision-making guides. As a result, suitable operating settings and instrumentation, control and automation (ICA) strategies for an integrated operation of the system components can be determined for various boundary conditions and transition paths can be evaluated. In close cooperation between the German and Chinese partners, implementation and application of the results on WWTP in China are demonstrated. The next step will be to expand the system boundaries through examination of market options for recycling products. The treatment options and possibilities of feed-in of biogas into the natural gas network are proved. Promotion and inhibitory factors for application, including acceptance among the population, are identified. The overall goal of the project is closing the material and nutrient cycles while maintaining an extremely good cleaning performance of WWTP to meet the strict Chinese limits and the improvement of the environmental situation (climate protection, reduction of emissions, protection of water, air and soil).