Professor Hongbo Liu from the University of Shanghai for Science and Technology as well as Mr. Liangcai Chen, Managing Director of Shanghai Lingxiao Environment Technology Co. Ltd, together with Prof. Max Dohmann (Aachen) visited the installation of the ZetaOptimizer high-voltage system of Poll Umwelt- und Verfahrenstechnik GmbH at the Bremen-Farge sewage treatment plant on Wednesday, August the 23rd 2023. Poll Umwelt- und Verfahrenstechnik GmbH and Shanghai Lingxiao Environment Technology Co. Ltd. intend to cooperate with each other in the future in the areas of sludge dewatering of municipal and industrial sewage sludge and the processing of biogas digestates. An agreement was signed for this purpose.