Water-saving agricultural practices can reduce negative environmental impacts in water-scarce regions all over the world. This study deals with an innovation that combines hydroponic crop production and municipal wastewater reuse for irrigation purposes. The research question was what impacts such hydroponic water reuse systems have on product confidence, economic viability, groundwater recharge, biodiversity and landscape quality. It should also be clarified under which conditions and with which measures these systems can be sustainable. To answer these questions, a number of generic hydroponic water reuse systems were modeled and assessed using a Bayesian Belief Network that included both numerical values and expert knowledge. The hydroponic water reuse systems with the most positive overall impacts are small-scale food production systems (tomatoes) equipped with lighting and heating whose products are marked with a quality label or with a label for regional products. The systems are located in a former industrial area. In addition, a wetland system and landscape integration are implemented as landscaping measures. Hydroponic systems can be operated economically viable, their products have a high level of product confidence and their ecological impacts can be positive. No tradeoffs have to be accepted between economic, social and ecological goals.

节水的农业实践可以减少全世界缺水地区的负面环境影响。这项研究涉及一项创新，将水培作物生产和市政废水回用结合起来用于灌溉目的。研究的问题是这样的水培水回用系统对产品信心，经济可行性，地下水补给，生物多样性和景观质量有什么影响。还应澄清这些系统在哪些条件和采取何种措施下可以可持续。为了回答这些问题，使用贝叶斯信念网络（包括数值和专家知识）对许多通用的水培水回用系统进行了建模和评估。总体影响最大的水培水回用系统是配备照明和供暖的小型食品生产系统（番茄），其产品均带有质量标签或区域产品标签。该系统位于以前的工业区。此外，实施湿地系统和景观整合作为美化措施。水培系统可以经济可行地运行，其产品具有很高的产品置信度，并且其生态影响可以是积极的。在经济，社会和生态目标之间不必进行权衡取舍。实施湿地系统和景观整合作为美化措施。水耕系统可以经济可行地运行，其产品具有很高的产品置信度，并且其生态影响可以是积极的。在经济，社会和生态目标之间不必进行权衡取舍。实施湿地系统和景观整合作为美化措施。水培系统可以经济可行地运行，其产品具有很高的产品置信度，并且其生态影响可以是积极的。在经济，社会和生态目标之间不必进行权衡取舍。