Filetype
1. IntroductionThe demand for efficient oil-water separation is driven by the tightening of discharge limits for e.g. produced water in the oil and gas industry, process water in the petrochemical industry and bilge water in the marine industry. The global produced water production alone is over 71 billion bbl/a – 8.4 billion m3/a [1]. Among the different technologies, particularly ultrafiltration
The global society has started a journey from using fossil-based raw material to the utilisation of climate-smart sustainable raw materials. Biorefineries have been identified as one of the backbones of the new bioeconomy using fermentation processes to convert biomass to biofuels and –chemicals and thus replacing the conventional C2/C3 chemistry with biotechnological processes. In current petro-c
This work addresses the assessment of ultrafiltration (UF) and nanofiltration (NF) for the treatment of a bleaching plant effluent (BPE) from aPortuguese sulphite pulp mill (Caima-Indústria de Celulose,S.A.) with the two-fold objective of water consumption minimization and by-products valorization. This is to be achieved through the recycling of UF/NF permeates as process water and the concentrati
The demand for water recovery in the industry is increasingly important partly due to water shortage and partly due to tightening of regulatory requirements. In this paper water recovery solutions for two challenging types of wastewater - oily and polyvinylchloride (PVC) wastewater - are presented. The first part of the presentation analyses the operation and performance of a membrane unit operate
IntroductionThe start of the 21st century is combined with the continuous replacement of classic C2/C3 chemistry with biological processes. This conversion process started at the end the 20th century and is combined with the integration of membrane processes as high selective and low energy consuming separation technologies in the production of fermentation based products. In fermentation based pr
1. IntroductionBoth the development of nowadays membrane technology and nutritive sweeteners started in the middle of the 20th century. The development of the asymmetric membranes using phase inversion was pioneered by Loeb and Sourirajan in the 1960-ies, while the discovery of glucose isomerase was a milestone in the commercialisation of high fructose corn syrup in the beginning of the 1970-ies.
Polysulfone (PSf) is a traditional material widely used for manufacturing microfiltration and ultrafiltration membranes by non-solvent induced phase separation (NIPS) process. However, the hydrophobic nature of PSf makes the membranes prone to protein fouling. In order to create non fouling surfaces and further decrease the pore size, the membrane pores can be modified by different strategies as a
For more than 30 years polyimides (PA) have been one of the main polymers for the fabrication of thin film composite membranes. Several researchers have assessed the main fabrication variables that influence the final structure of the polyamide layers including monomer concentration, solvents, additives in aqueous and organic phases and type of support to mention few [1,2]. However, few studies ha
1. IntroductionThe starting point of modern biotechnology is often defined by the production of lactic acid by Pasteur in 1857 and the discovery of penicillin by Fleming in 1928. During this first wave of biotechnological processes moved production of e.g. antibiotics and amino acids from laboratory to industrial scale. The second wave of biotechnological processes started with the discovery of th
The event-by-event correlations between three flow amplitudes are measured for the first time in Pb-Pb collisions, using higher-order symmetric cumulants. We find that different three-harmonic correlations develop during the collective evolution of the medium when compared to correlations that exist in the initial state. These new results cannot be interpreted in terms of previous lower-order flow
The value added of the Swedish industrial sector has earlier been calculated by Osten Johansson (ÖJ)2 and the Economic Research Institute (Konjunkturinstituiet, KI). 3 However, these calculations have proved to be in need of revision on various points. In the following pages new calculations are shown for a shorter period, 1941–51. Furthermore, an attempt has been made to construct a new price ind
The Swedish Municipality Act, issued in 1862, consolidated a plutocratic system in which ownership and income, and the resulting level of taxation, translated into political power. However, as a measure to hinder large landowners from holding a majority of the votes, the Act guaranteed voting rights for tenants. The aim of the article is to analyse how power relations played out after this challen
During the 18th and 19th centuries there were no regional customs areas in Sweden, but the country constituted one homogenous free trade area. The only exception was the duties which were to be paid when the goods were brought to the towns. It was a turnover tax levyed on the goods brought in and was in effect from 1622 to the beginning of the 1800s.
