Toilet wastewater is treated and reused on site at Europe's highest membrane bioreactor (MBR), located in a cable car mountain station in the ski resort of Zermatt. Negative impacts on the sensitive mountain environment are minimised by reusing close to 100% of the treated wastewater for toilet flushing. Besides 100% nitrogen removal, 80% of phosphorus was also eliminated. This paper presents operational results, optimisations of sludge management, decoloration and long-term maintenance of biomass in the very low-loaded summer season. From a global view the experiences and results of the project are of great importance, proposing a solution to a problem existing 100-fold in the Alps as well as in arid regions all over the world: reducing water consumption for sanitation by reuse.
Treatment of toilet wastewater for reuse in a membrane bioreactor
M. Boehler, A. Joss, S. Buetzer, M. Holzapfel, H. Mooser, H. Siegrist; Treatment of toilet wastewater for reuse in a membrane bioreactor. Water Sci Technol 1 September 2007; 56 (5): 63–70. doi: https://doi.org/10.2166/wst.2007.557
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