Sökresultat

The fate of pollutants in rivers is mainly affected by the longitudinal dispersion coefficient (Kx). Thus, improved Kx estimation could greatly enhance the water quality management of rivers. In this regard, evolutionary polynomial regression (EPR) was used to accurately predict Kx in rivers as a function of flow depth, channel width, and average and shear velocities. The predicted Kx by EPR model

We perform a land-surface model intercomparison to investigate how the simulation of permafrost area on the Tibetan Plateau (TP) varies among six modern stand-alone land-surface models (CLM4.5, CoLM, ISBA, JULES, LPJ-GUESS, UVic). We also examine the variability in simulated permafrost area and distribution introduced by five different methods of diagnosing permafrost (from modeled monthly ground

The sharing economy has many faces, and it has taken our societies by storm. For many people, it has quickly become a norm to book accommodation via AirBnB, or to think sharing instead of owning when it comes to products of their everyday lives. The tourism industry has seen many adaptions towards a sharing economy, one of them being a new way of conducting guided tours. Based on an innovation in The sharing economy has many faces, and it has taken our societies by storm. For many people, it has quickly become a norm to book accommodation via AirBnB, or to think sharing instead of owning when it comes to products of their everyday lives. The tourism industry has seen many adaptions towards a sharing economy, one of them being a new way of conducting guided tours. Based on an innovation in

Om artificiell intelligens som regleringsfråga och tillsynsutmaning i en replik på Daniel Akenines (teknikchef Microsoft Sverige) debattartikel i SvD.

1. IntroductionThe end of the 20th century was marked by the start of the third and so far final wave of biotechnology, the so-called white biotechnology, aiming to substitute chemical processes based on C2/C3 chemistry of oil and gas by biotechnological processes. The standard conversion process in biotechnology is fermentation, which is used to produce a wide range of bulk products such as antib

Dextrose syrups are produced from starch by liquefaction combined with saccharification. In the conventional production process, rotary vacuum filters (RVFs) with a diatomaceous earth (kieselguhr) coating as filter aid are often used for removal of the so-called mud phase after the liquefaction and saccharification step. This mud phase consists of insoluble impurities and suspended solids such as

Over the last two decades the market for membrane technology in the food industry increased to a market volume of approx. € 50 million and is now the second largest industrial market for membranes after municipal water treatment in Germany. The key membrane technologies in the food industry are the pressure driven membrane processes; microfiltration, ultrafiltration, nanofiltration and reverse osm

Membrane processes, antibiotics, enzymes, biofuels and biochemicalsThe end of the 20th century was marked by the start of the third and so far final wave of biotechnology, the so-called white biotechnology, aiming to substitute chemical processes based on C2/C3 chemistry of oil and gas by biotechnological processes. The standard conversion process in biotechnology is fermentation, which is used to

The starch and yeast industries are two key sectors of the European food industry, with annual turnovers of approx. € 4 billion and € 500 million, respectively, in Europe alone. The production processes in the starch and yeast industries are still dominated by conventional separation processes such as evaporators, separators and rotary vacuum filters (RVFs), and membrane processes are only rarely

Membrane applications have established themselves in both the production and water loop of the starch-based sweetener industry. This presentation will give an overview of membrane opportunities in the starch-based sweetener industry is given. In the first part of this paper, the membrane opportunities in the production loop of starch-based sweeteners will be generally discussed and application stu

Conventional separation processes such as evaporators and separators often compete directly with membrane processes, i.e. microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). The aim of this lecture is to highlight the potentials of combining membrane processes and conventional separation processes by the means of process synergies. In the first part of the lec

In heat exchanger and membrane processes fouling stands for a significant part of the running costs such as e.g. down time for cleaning, consumption of cleaning chemicals, water and energy and contributes also to a shortened equipment life time. It is therefore one of the major challenges in the process industry. The first part of the presentation will give a general introduction into fouling in h

Rotary vacuum filters (RVFs) with adiatomaceous earth (kieselguhr) coatings as filter aid are the most established technology for the removal of the so-called mud fraction after liquefaction and saccharification in the production of starch-based sweeteners. The RVFs is an open process which is further associated with the use of filters resulting in an increasing disposal challenge. Based on this t

Due to increasing oil price and environmental concerns, current European initiatives are aiming to increase the share of Biofuel used for transportation from approx. 2 % (2005) to 5.75% in 2010. The production capacity of bioethanol in Germany alone has therefore to increase during this period from 0.7 mio. m³ to 1.8 mio. m³ 1. The feed stocks of current bioethanol concepts are sugar and starch

IntroductionDuring 2008, the oil price climbed from one peak to the next. Despite the fact that high grain and sugar prices – the main feed stocks for bioethanol plant – are currently causing a slow down in the realisation of bioethanol projects, the interest for renewable fuels is still increasing. In the Nordic countries, Sweden and Finland are leading the development of bioethanol production, w

Every year, 100,000 tons of dissolved hemicelluloses are discharge unused with wastewater from thermomechanical pulp mills around the world. Isolation of these hemicelluloses from the wastewater would not only reduce the treatment costs for the pulp mills but would also provide an excellent raw material for high value applications such as oxygen barriers in food packaging. The isolation of the hem

We trapped birds on the island of Capri, SW Italy, during February and earliest March 2002-2004 and in November-December 2004. The trapped birds were ringed, and common biometrical parameters measured. In total 247 birds of 17 species were trapped, a rather limited number, whereof c. 70% were either European Robins Erithacus rubecula, Blackcaps Sylvia atricapilla, Sardinian Warblers Sylvia melanoc