Maximilian Grau

Projects

• Low-tech decentralised wastewater treatment for self-sufficient and climate-resilient water systems / Team member / ongoing
• REPIC – Decentralized biochar production based on climate friendly sludge processing / Project leader / ongoing
• Improving Circular Economy Practices and Food Security in the Agriculture Sector by Valorizing Organic Residues Using Thermo-Chemical Processes / Team member / ongoing
• The Blackwater Project in Cape Town / Deputy project leader / ongoing
• The Low-Tech Water Project / Deputy project leader / completed
• From Toilet to Field: Ecological Sanitation & Soil Regeneration in Guatemala / Project leader / completed
• Value Next – Transdisciplinary Research for a Circular Water Future / Team member / completed
• Water and Nutrient Circularity as a Service / Project leader / completed
• Integration of water and nutrient cycles in the renovation of a single-family detached home / Project leader / completed
• Evaluation of methods for monitoring the quality of treated domestic grey water for water re-use / Project leader / completed
• Development of multi-functional, modular green wall systems with 3D rapid prototyping for circular cities / Project leader / completed

Publications

Written conference contributions, peer-reviewed

• Grau, M. et al. (2025) 'Operational experiences with a novel green wall system with integrated grey water treatment', in 13th IEES International Conference 'Closed Cycles and the Circular Society – The Power of Ecological Engineering', Reykjavik, Iceland, 16-18 July 2025.
• Grau, M. et al. (2025) 'Development of a novel green wall system with integrated greywater treatment for on-site water reuse', in 14th IWA International Conference on Water Reclamation & Reuse, Cape Town, South Africa, 16-19 March 2025.
• Aubert, A. et al. (2024) 'Water and Nutrient Circularity as a Service (WaNCaaS) : a feasibility study for new business models to close the water and nutrient cycles in the food industry', in FTAL Conference 2024 – Circular Economy, Lugano, Switzerland, 14-15 November 2024.
• Grau, M. G. P., Krähenbühl, N. and Antenen, N. (2023) 'Identifying substrates for greywater treatment in a novel green wall system based on trickling filters', in 6th IWA International Conference on Eco-Technologies for Wastewater Treatment, Girona, Spain, 26-29 June 2023. International Water Association. doi: 10.21256/zhaw-28911.

Other publications

• Grau, M. et al. (2026) 'Wasser- und Nährstoffkreisläufe schliessen', Aqua & Gas, 2026(4), pp. 54–57. doi: 10.21256/zhaw-36352.
• Bühler, D. et al. (2026) Grauwassernutzung in der Schweiz : Synthese und Empfehlungen. Wädenswil: ZHAW Zürcher Hochschule für Angewandte Wissenschaften. doi: 10.21256/zhaw-2581.
• Krähenbühl, N. and Grau, M. (2024) Low-cost sensors for greywater recycling. Wädenswil: ZHAW Zurich University of Applied Sciences.

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