Due to water scarcity and water pollution, the importance of water reuse is increasing more and more. As part of a German research programme on water reuse, the effluent of a wastewater treatment plant in the coastal region of northern Germany was used to investigate within the project MULTI-ReUse the direct treatment of tertiary effluent for usage in different applications in industry or agriculture. A modular constructed pilot system has been operated to optimize different treatment chains producing different water qualities simultaneously. The technological focus was put on membrane technologies, namely ultrafiltration (UF) and reverse osmosis (RO), and also biofiltration, adsorption and disinfection were part of the piloting. Beside the development of monitoring strategies for ensuring biological and chemical safe water qualities, the operational stability and the safe transport of water to the consumers were examined. The direct treatment of wastewater is a demanding task due to the lack of dilution and hydraulic retention time in the receiving water (environmental buffer). However, the multiple barrier approach guaranteed constant secure water. Fine adjustments of individual processes were particularly important. A stable operation of the UF could be realized in particular by using more or less intermittent inline coagulation as coating. The RO performance could be improved significantly by using monochloramine as disinfectant to minimize biofouling.

由于缺水和水污染，中水回用的重要性越来越高。作为德国水回用研究计划的一部分，德国北部沿海地区的污水处理厂的废水被用于MULTI-ReUse项目中的三次废水的直接处理研究，以用于工业或农业的不同应用。已操作了模块化构造的中试系统，以优化同时产生不同水质的不同处理链。技术重点放在膜技术上，即超滤（UF）和反渗透（RO），生物滤，吸附和消毒也是试验的一部分。除了制定确保生物和化学安全水质的监测策略外，检查了水的运行稳定性和向消费者的安全运输。由于在接收水（环境缓冲液）中缺乏稀释和水力停留时间，因此废水的直接处理是一项艰巨的任务。但是，多重屏障方法保证了恒定的安全用水。个别过程的微调尤为重要。UF的稳定运行尤其可以通过使用或多或少的间歇式在线凝结作为涂层来实现。通过使用一氯胺作为消毒剂以最大程度地减少生物污垢，可以显着提高反渗透性能。由于在接收水（环境缓冲液）中缺乏稀释和水力停留时间，因此废水的直接处理是一项艰巨的任务。但是，多重屏障方法保证了恒定的安全用水。个别过程的微调尤为重要。UF的稳定运行尤其可以通过使用或多或少的间歇式在线凝结作为涂层来实现。通过使用一氯胺作为消毒剂以最大程度地减少生物污垢，可以显着提高反渗透性能。由于在接收水（环境缓冲液）中缺乏稀释和水力停留时间，因此废水的直接处理是一项艰巨的任务。但是，多重屏障方法保证了恒定的安全用水。个别过程的微调尤为重要。UF的稳定运行尤其可以通过使用或多或少的间歇式在线凝结作为涂层来实现。通过使用一氯胺作为消毒剂以最大程度地减少生物污垢，可以显着提高反渗透性能。