The study illustrated how the IPS system serves a dual purpose by biodrying materials for fertilizer or fuel while using minimal energy expenditure, compared to conventional drying methods. It was determined that an automated, agitated bin composting technology could achieve 65 percent solids concentration (35 percent moisture) in biosolids by using only the finished dried product as the amendment.
An IPS composting system agitator similar to the technology used in the MEB pilot studies, where 65 percent solids concentration (35 percent moisture) was achieved in biosolids, using only the finished dried product as the amendment. Picture: Siemens AG
In the pilot study, the IPS Composting System was found to consistently dry to 65 percent solids with an in-feed mixture of at least 40 percent solids, comprised of dewatered cake (of at least 20 percent solids) and recycled dried product discharged from the IPS system (of at least 60 percent). Overall, the solids concentration increased an average of approximately one percent per day and as much as two percent per day in the agitated bin system when minimum in-feed conditions were met. Summer and winter studies focused on such variables as ambient air temperature, feedstock properties, turning frequency, bin retention time, and process aeration cycles.
The MEB process uses the biosolids’ own biological characteristics to heat the material and, in doing so, to evaporate some of the moisture. Aeration and agitation from the IPS equipment further enhance the biological process drying. The IPS biodrying process is more cost effective and energy efficient than thermal drying, and the resultant end-product can be used as fertilizer or feedstock for incineration. Creating a biosolids fuel product with an energy-conservative process makes MEB an ideal companion for conversion technologies. It was also found that applying similar MEB principles to biosolids composting addresses the challenge confronting plants when wood waste and other carbon-rich amendments are in short supply. Further research is looking at also possibly using the process before gasification.
A versatile system like the MEB that is capable of both composting and biodrying ensures WWTPs of a long-term flexible solution. On the one hand, some EU countries such as Austria, Denmark, Germany, the Netherlands, and Slovenia have stricter country-specific regulations regarding the agricultural use of biosolids by significantly limiting the maximum annual application of heavy metals. Where agricultural utilization is restricted, incineration is often selected as the sludge or biosolids management option. Therefore, biodrying or MEB would be an appropriate step before incineration. On the other hand, roughly 38 percent of EU countries land-apply treated biosolids, with France, Ireland, Spain, and the UK topping that list. Many of these countries have found composting to be a more socially acceptable, energy-efficient, and environmentally-friendly alternative to landfilling or incineration.
Besides municipal WWTPs, the IPS system is also applicable to other industries: the UK Department of Environment, Food and Rural Affairs (DEFRA) recently approved the IPS system, to be considered a "closed reactor" under Regulation (EC) 1774/2002 to compost catering wastes. The United Kingdom has composting guidelines that are more stringent than most of the other EU countries because of concerns over swine vesicular disease, foot-and-mouth disease, and other animal-related infections.Contact USA:
Further information and downloads at: http://www.siemens.com/industry-solutions«
Stefanie Schiller | Siemens Industry
SYSTEMS INTEGRATION 2018 in Switzerland focuses on building blocks for industrial digitalization
20.11.2017 | IVAM Fachverband für Mikrotechnik
Medica 2017: New software enables early diagnosis of arteriosclerosis
06.11.2017 | Technische Universität Kaiserslautern
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
21.11.2017 | Physics and Astronomy
21.11.2017 | Physics and Astronomy
21.11.2017 | Life Sciences