Maximilian Grau

Projects

• Advance cost-effective biological wastewater treatment (CEBWT) technologies / 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 / ongoing
• From Toilet to Field: Ecological Sanitation & Soil Regeneration in Guatemala / Project leader / ongoing
• 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., Horber, H., Bertschy, A., Trachsel Geissmann, E., & Heinrich, A. (2025, July). Operational experiences with a novel green wall system with integrated grey water treatment. 13th IEES International Conference “Closed Cycles and the Circular Society – the Power of Ecological Engineering”, Reykjavik, Iceland, 16-18 July 2025.
• Grau, M., Krähenbühl, N., Bertschy, A., Trachsel Geissmann, E., Heinrich, A., Hüppi, P., & Carl, W. (2025, March). Development of a novel green wall system with integrated greywater treatment for on-site water reuse. 14th IWA International Conference on Water Reclamation & Reuse, Cape Town, South Africa, 16-19 March 2025.
• Aubert, A., Grau, M., Meylan, G., & Pfändler, N. (2024, November 14). 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. FTAL Conference 2024 – Circular Economy, Lugano, Switzerland, 14-15 November 2024.
• Grau, M. G. P., Krähenbühl, N., & Antenen, N. (2023, June). Identifying substrates for greywater treatment in a novel green wall system based on trickling filters. 6th IWA International Conference on Eco-Technologies for Wastewater Treatment, Girona, Spain, 26-29 June 2023. https://doi.org/10.21256/zhaw-28911

Other publications

Bühler, D., Steuerwald, D., Lüthi, L., Giacomelli, R., & Grau, M. (2026). Grauwassernutzung in der Schweiz : Synthese und Empfehlungen. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. https://doi.org/10.21256/zhaw-2581

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