Urine accounts for less than 1% of our waste water, but it contains 50-80% of the nutrients in the waste water. For this reason, it is extremely burdensome for our sewer water purification installations. In fact, it is illogical to allow such a dirty waste water flow to mix with other waste water, as has occurred in our sewers for more than a hundred years. There is growing support therefore for collecting and purifying urine separately. By separating urine, phosphate and nitrogen are more effectively removed. Phosphate can even be reclaimed as a raw material. Urine accounts for at least 50% of the phosphate in waster waste, (with phosphate being a raw material of limited availability), and for 80% of the nitrogen found in the waste water.
In Sweden and other countries, experiments have been conducted involving separate urine-collections. Delft University of Technology PhD candidate Jac Wilsenach researched – supported by a STOWA grant – the possibilities and consequences of following this principle in the Netherlands. He concluded that if 50% of the urine is separately purified, it would save 25% of the energy needed for the entire purification system. Moreover, the stench of the sewer will be lessened, environmental pressure on the surface water will be reduced, and sewer pipes will be better protected against rot.
A requirement for separating urine is an appropriate toilet (on which men also sit to urinate) or a dry urinal, both of which are commercially available. The urine is collected in tanks on a per building or neighbourhood basis and must then be - preferably as undiluted as possible - periodically transported to a special purification installation. It is also possible to process the urine in a decentralized manner - concepts for this were developed in the research.
Frank Nuijens | alfa
Bioinvasion on the rise
15.02.2017 | Universität Konstanz
Litter Levels in the Depths of the Arctic are On the Rise
10.02.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News