A5025407456- Wastewater Treatment and Reuse
- Wastewater Treatment and Nitrogen Removal
- Constructed Wetlands for Wastewater Treatment
- Phosphorus and nutrient management
- Ammonia Synthesis and Nitrogen Reduction
- Water Treatment and Disinfection
- Microbial Fuel Cells and Bioremediation
- Child Nutrition and Water Access
- Advanced oxidation water treatment
- Microbial Community Ecology and Physiology
- Water-Energy-Food Nexus Studies
- Clinical Nutrition and Gastroenterology
- Environmental Science and Technology
- Anaerobic Digestion and Biogas Production
- Advanced Photocatalysis Techniques
- Pharmaceutical and Antibiotic Environmental Impacts
- Water Governance and Infrastructure
- Membrane Separation Technologies
- Viral gastroenteritis research and epidemiology
- Soil and Water Nutrient Dynamics
- Esophageal and GI Pathology
- Spaceflight effects on biology
- Water Quality Monitoring Technologies
- Atmospheric and Environmental Gas Dynamics
- Mine drainage and remediation techniques
Swiss Federal Institute of Aquatic Science and Technology
2016-2025
ETH Zurich
2018-2024
Institute of Environmental Engineering
2023
Board of the Swiss Federal Institutes of Technology
2018-2019
Massachusetts Institute of Technology
2008
École Polytechnique Fédérale de Lausanne
1998
Nitrous oxide (N(2)O) is an environmentally important atmospheric trace gas because it effective greenhouse and leads to ozone depletion through photo-chemical nitric (NO) production in the stratosphere. Mitigating its steady increase concentration requires understanding of mechanisms that lead formation natural engineered microbial communities. N(2)O formed biologically from oxidation hydroxylamine (NH(2)OH) or reduction nitrite (NO(-) (2)) NO further N(2)O. Our review biological pathways...
Urine separation is a promising alternative to present-day waste water management. It can help manage our nutrient flows in sustainable way. Currently, techniques are being developed recycle and treat source-separated urine. These techniques, however, must consider the spontaneous processes that change separated The initial cause of changes contamination with microorganisms, which hardly be avoided urine-collecting systems. most important transformation microbial urea hydrolysis, mineral...
In this study, we investigated the prevention of enzymatic urea hydrolysis in fresh urine by increasing pH with calcium hydroxide (Ca(OH)2) powder. The amount Ca(OH)2 dissolving depends significantly on composition urine. different compositions used our simulations showed that between 4.3 and 5.8 g dissolved 1 L at 25 °C. At temperature, saturation is 12.5 far above 11, which identified as upper limit for hydrolysis. However, temperature has a strong effect pH, higher values being achieved...
Biocatalyzed electrolysis is a microbial fuel cell based technology for the generation of hydrogen gas and other reduced products out electron donors. Examples donors are acetate wastewater. An external power supply can support process therefore circumvent thermodynamical constraints that normally render compounds such as unlikely. We have investigated possibility biocatalyzed methane. The cathodically produced could be converted into methane at ratio 0.41 mole mole−1 acetate, temperatures...
Separate collection of urine, which is only 1% wastewater volume but contains the majority nitrogen humans excrete, can potentially reduce costs and energy input treatment facilitate recovery for beneficial use. Ion exchange was investigated as ammonium from urine use a fertilizer or disinfectant. Cation adsorption curves four adsorbents (clinoptilolite, biochar, Dowex 50, Mac 3) were compared in pure salt solutions, synthetic real stored urine. Competition sodium potassium present did not...
Source-separated urine contains most of the excreted nutrients, which can be recovered by using nitrification to stabilize before concentrating nutrient solution with distillation. The aim this study was test process combination at pilot scale. efficient in a moving bed biofilm reactor maximal rates 930 mg N L(-1) d(-1). Rates decreased 120 d(-1) after switching more concentrated urine. At high (640 d(-1)) and low total ammonia concentrations (1,790 NH4-N influent) distillation caused main...
Urine contains about 50 % of the phosphorus (P) and 90 nitrogen (N) excreted by humans is therefore an interesting substrate for nutrient recovery. Source-separated urine can be used to precipitate struvite or, through a newly developed technology, nitrified fertilizer (NUF). In this study, we prepared 33P radioisotope- stable 15N isotope-labeled synthetic NUF (SNUF) using determined P N uptake greenhouse-grown ryegrass (Lolium multiflorum var. Gemini) fertilized with these products. The in...
Recent developments in high- and middle-income countries have exhibited a shift from conventional urban water systems to alternative solutions that are more diverse source separation, decentralization, modularization. These include nongrid, small-grid, hybrid address such pressing global challenges as climate change, eutrophication, rapid urbanization. They close loops, recover valuable resources, adapt quickly changing boundary conditions population size. Moving requires both technical...
Ammonia oxidation decreases the pH in wastewaters where alkalinity is limited relative to total ammonia. The activity of ammonia oxidizing bacteria (AOB), however, typically with and often ceases completely slightly acidic wastewaters. Nevertheless, nitrification at low has been reported reactors treating human urine, but it unclear which organisms are involved. In this study, we followed population dynamics reactor performance synthetic fully hydrolyzed urine as decreased over time response...
In laboratory experiments, source-separated urine was stabilised with nitrification and denitrified via nitritation anaerobic ammonium oxidation. The highest total ammonia concentration in the influent 7,300 gN/m3, maximum pH 9.2. a moving bed biofilm reactor (MBBR) Kaldnes® carriers, we as 1:1 nitrate solution. rate 380 gN/m3/d corresponding to 1.7 gN/m2biofilm/d. Nitrite solutions were produced continuous flow stirred tank (CSTR) 4.8 days sludge retention time (SRT) at 30°C sequencing...
In recent years, a large number of urine-diverting dehydration toilets (UDDTs) have been installed in eThekwini to ensure access adequate sanitation. The initial purpose these was facilitate faeces drying, while the urine diverted into soak pit. This practice can lead environmental pollution, since contains high amounts nutrients. Instead polluting environment, nutrients should be recovered and used as fertiliser. 2010 international transdisciplinary research project VUNA initiated order...