Kjaer L.L.,Technical University of Denmark |
Host-Madsen N.K.,NIRAS |
Schmidt J.H.,2. 0 LCA Consultants |
McAloone T.C.,Technical University of Denmark
Sustainability (Switzerland) | Year: 2015
An increasing number of companies are expanding their environmental impact reduction targets and strategies to include their supply chains or whole product life cycles. In this paper, we demonstrate and evaluate an approach, where we used a hybrid Environmental Input-Output (EIO) database as a basis for corporate and product environmental footprint accounts, including the entire supply chain. We present three cases, where this approach was applied. Case study 1 describes the creation of total corporate carbon footprint accounts for three Danish regional healthcare organisations. In case study 2, the approach was used as basis for an Environmental Profit and Loss account for the healthcare company, Novo Nordisk A/S. Case study 3 used the approach for life cycle assessment of a tanker ship. We conclude that EIO-based analyses offer a holistic view of environmental performance, provide a foundation for decision-making within reasonable time and cost, and for companies with a large upstream environmental footprint, the analysis supports advancing their sustainability agenda to include supply chain impacts. However, there are implications when going from screening to implementing the results, including how to measure and monitor the effect of the different actions. Thus, future research should include more detailed models to support decision-making. © 2015 by the authors.
Wildenberg M.,Umweltforschungsinstitut |
Bachhofer M.,FCMappers.net |
Isak K.Q.,NIRAS |
Skov F.,University of Aarhus
Intelligent Systems Reference Library | Year: 2014
A halt in loss of biodiversity is an important issue in conservation management across Europe. As landscapes tend to be perceived as a combination of natural and social elements, and people’s values and attitudes, research supporting conservation management is dealing with landscapes as socio-ecological systems. As part of ALTER-Net, we applied FCM to five cases and subsequently evaluated the approach by means of a SWOT framework. This examined the strengths and weaknesses of, and the opportunities and threats to FCM when applied as a tool in conservation management. © Springer-Verlag Berlin Heidelberg 2014.
Nason P.,Lulea University of Technology |
Johnson R.H.,U.S. Geological Survey |
Neuschutz C.,Niras |
Alakangas L.,Lulea University of Technology |
Ohlander B.,Lulea University of Technology
Journal of Hazardous Materials | Year: 2014
Novel solutions for sulfide-mine tailings remediation were evaluated in field-scale experiments on a former tailings repository in northern Sweden. Uncovered sulfide-tailings were compared to sewage-sludge biosolid amended tailings over 2 years. An application of a 0.2. m single-layer sewage-sludge amendment was unsuccessful at preventing oxygen ingress to underlying tailings. It merely slowed the sulfide-oxidation rate by 20%. In addition, sludge-derived metals (Cu, Ni, Fe, and Zn) migrated and precipitated at the tailings-to-sludge interface. By using an additional 0.6. m thick fly-ash sealing layer underlying the sewage sludge layer, a solution to mitigate oxygen transport to the underlying tailings and minimize sulfide-oxidation was found. The fly-ash acted as a hardened physical barrier that prevented oxygen diffusion and provided a trap for sludge-borne metals. Nevertheless, the biosolid application hampered the application, despite the advances in the effectiveness of the fly-ash layer, as sludge-borne nitrate leached through the cover system into the underlying tailings, oxidizing pyrite. This created a 0.3. m deep oxidized zone in 6-years. This study highlights that using sewage sludge in unconventional cover systems is not always a practical solution for the remediation of sulfide-bearing mine tailings to mitigate against sulfide weathering and acid rock drainage formation. © 2014 Elsevier B.V.
Andersen O.,NIRAS |
Moerup H.,NIRAS |
Assessment, Upgrading and Refurbishment of Infrastructures | Year: 2013
The bridge was constructed in the 1930s and is approximately 1.2 km long, and the only railway connection between the western and the eastern part of Denmark. The bridge crosses a narrow belt of the sea. The bridge superstructure is a rivet steel girder structure, and recent investigations undertaken approximately 5 years ago indicated that the residual lifetime for the steel structure is 100 year. However, the preliminary investigations of the 4 main concrete piers situated in seawater indicated that some degradation of the concrete was occurring. A detailed investigation of the concrete in the piers confirmed extensive cracking in 10 % of the concrete due to reactive aggregates from a local source. Ingress of seawater into the piers accelerates the alkali-silica-reactions and has resulted in a built up of a very high chloride concentration in the concrete, which would normally cause severe corrosion of the reinforcement. But because of the lack of oxygen, only limited corrosion has yet occurred, and the strength of the reinforcement has only been affected to a minor degree. Additionally, numerous samples were collected and tests carried out, including: Measuring the compressive strength on samples with severe cracking. The results concluded that the current strength of the structure was sufficient to achieve the necessary load bearing capacity. Based on the results and conclusion from the field and laboratory campaign, a maintenance program will be prepared to ensure that future degradation can be controlled and the load bearing capacity remain sufficient.
Fjordboge A.S.,Technical University of Denmark |
Lange I.V.,Technical University of Denmark |
Bjerg P.L.,Technical University of Denmark |
Binning P.J.,Technical University of Denmark |
And 2 more authors.
Journal of Contaminant Hydrology | Year: 2012
The impact of source mass depletion on the down-gradient contaminant mass discharge was monitored for a 19-month period as a part of a field demonstration of the ZVI-Clay soil mixing remediation technology. Groundwater samples were collected from conventional monitoring wells (120 samples) and a dense network of multilevel samplers (640 samples). The hydraulic gradient and conductivity were determined. Depletion of the contaminant source is described in the companion paper (Fjordboge et al., 2012). Field data showed four distinct phases for PCE mass discharge: (1) baseline conditions, (2) initial rapid reduction, (3) temporary increase, and (4) slow long-term reduction. Numerical modeling was utilized to develop a conceptual understanding of the four phases and to identify the governing processes. The initial rapid reduction of mass discharge was a result of the changed hydraulic properties in the source zone after soil mixing. The subsequent phases depended on the changed accessibility of the contaminant mass after mixing, the rate of source depletion, and the concentration gradient at the boundaries of the mixed source zone. Overall, ZVI-Clay soil mixing resulted in a significant down-gradient contaminant mass discharge reduction (76%) for the parent compound (PCE), while the overall reduction of chlorinated ethenes was smaller (21%). © 2012 Elsevier B.V.
Fjordboge A.S.,Technical University of Denmark |
Riis C.,NIRAS |
Christensen A.G.,NIRAS |
Kjeldsen P.,Technical University of Denmark
Journal of Contaminant Hydrology | Year: 2012
Field investigations on the effects of ZVI-Clay soil mixing were conducted at a small DNAPL source zone with PCE as the parent compound. In a one-year monitoring program, soil samples were collected at three horizontal sampling planes (2.5, 5.0 and 7.5 m bgs.). PCE was found to have a pseudo first-order degradation half-life of 47 days resulting in more than 99% depletion of the source mass after one year. The main degradation product was ethene, while only low concentrations of the primarily biotic sequential degradation products (cDCE, VC) were detected. The soil mixing resulted in more homogeneous vertical conditions, while the horizontal homogenization was very limited. Iron was delivered in the full targeted depth with an average iron enrichment of 3.1%, and an average decline in the oxidation-reduction potential of more than 500 mV. Due to the applied top-down addition of ZVI, the iron content decreased from 4.6% to 2.1% on average over a depth of 5 m; hence, there is a potential for optimization of the delivery method. Most in situ technologies are limited by subsurface heterogeneities, whereby the successful dispersion of geological units and contaminants holds great promise for remediation of DNAPL source zones with ZVI-Clay soil mixing. © 2012 Elsevier B.V.
Simonsen R.,Value Creating Construction Processes |
Thyssen M.H.,NIRAS |
22nd Annual Conference of the International Group for Lean Construction: Understanding and Improving Project Based Production, IGLC 2014 | Year: 2014
Management concepts tend to fade away within a relatively short period of time. After a few years the news value declines, the "gurus" disappear, difficulties in realizing the expected gains are recognized, and new management concepts take over. This paper brings attention to the simple question: How is it possible to sustain interest in Lean Construction? Drawing on literature describing the typical life-cycle of management concepts, the journey of Lean Construction and Lean Construction Institute (LCI) in Danish construction is used as a case. LCI Denmark (LCI-DK) was established in 2002 as the first chapter outside of the USA and may therefore be ahead in regards of concept life-cycle to other LCI chapters around the world. It is argued that a revitalization is needed in Denmark if Lean Construction is to overcome the typical life-cycle of other previous management concepts. This leads to a discussion of implementation barriers and challenges to keeping Lean Construction alive, and how to overcome them. The aim is to spur a discussion that may benefit all who are struggling with implementation barriers or find themselves in a post-interest era.
Rasmussen M.B.,NIRAS |
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2010
This paper describes the process of designing and building a new arched footbridge in Copenhagen. The architect's visions of making a significant gateway to the city, followed by engineering challenges in constructing a slender asymmetric bridge. From prefabrication in different parts of Europe to complicated erection processes. Furthermore dynamic investigations were made and tuned mass dampers were installed to reduce vibrations.
PubMed | Geosyntec Consultants, Cowi A/S, NIRAS, FLUTe Technology and 2 more.
Type: | Journal: Journal of contaminant hydrology | Year: 2016
Characterization of dense non-aqueous phase liquid (DNAPL) source zones in limestone aquifers/bedrock is essential to develop accurate site-specific conceptual models and perform risk assessment. Here innovative field methods were combined to improve determination of source zone architecture, hydrogeology and contaminant distribution. The FACT is a new technology and it was applied and tested at a contaminated site with a limestone aquifer, together with a number of existing methods including wire-line coring with core subsampling, FLUTe transmissivity profiling and multilevel water sampling. Laboratory sorption studies were combined with a model of contaminant uptake on the FACT for data interpretation. Limestone aquifers were found particularly difficult to sample with existing methods because of core loss, particularly from soft zones in contact with chert beds. Water FLUTe multilevel groundwater sampling (under two flow conditions) and FACT sampling and analysis combined with FLUTe transmissivity profiling and modeling were used to provide a line of evidence for the presence of DNAPL, dissolved and sorbed phase contamination in the limestone fractures and matrix. The combined methods were able to provide detailed vertical profiles of DNAPL and contaminant distributions, water flows and fracture zones in the aquifer and are therefore a powerful tool for site investigation. For the limestone aquifer the results indicate horizontal spreading in the upper crushed zone, vertical migration through fractures in the bryozoan limestone down to about 16-18m depth with some horizontal migrations along horizontal fractures within the limestone. Documentation of the DNAPL source in the limestone aquifer was significantly improved by the use of FACT and Water FLUTe data.
News Article | December 22, 2016
The merger will create a new major player in the consulting engineering industry. With over 2,000 employees globally, the merged company is ready for continued growth – especially abroad. Virum, Denmark, 22-Dec-2016 — /EuropaWire/ — With the merger of ALECTIA and NIRAS, a new major player will be established in the consulting engineering industry – a player who is ready to grow internationally based on our solid presence in Denmark. To date, both companies have had aggressive growth strategies, and we will stand by these. ”We will be increasing our volume and our ability to offer our customers even more under one roof. Across all sectors in which we operate, we will be among the market leaders. We will have very strong professional environments that will make the new company an attractive workplace for the best specialist staff,” says Carsten Toft Boesen, CEO of NIRAS The more robust professional environments are a strong launching pad for winning larger and more complex projects, providing employees with a broader range of career opportunities, NIRAS’ CEO points out. At the same time, there are obvious synergies which will make the merged company more competitive. Continued growth ambitions It is the first time that two of the industry’s largest companies will be merging. The merger will be completed by merging the foundations that constitute our major shareholders and, subsequently, merging the operational companies. Instead of spending money on acquisitions, the merged company will, therefore, be starting with the joint financial strength of the two companies. Thus, we will continue our growth strategy, especially internationally. ”We will have even greater financial power to fulfil our growth strategy. We have to evolve from being a predominantly Danish company to becoming a Scandinavian company with an international orientation, which can create sustainable solutions to the major global challenges in our society,” says Carsten Toft Boesen. Stronger competitiveness It was ALECTIA’s CEO, Jesper Mailind, who initiated the dialogue that is now leading to this merger. He sees the two companies as a good match and the merger as the perfect basis for future development. ”In an industry that is consolidating both nationally and internationally, the aim of the merger was to create a solid platform for future growth. The merger will strengthen our competitiveness and will give us the best starting point for being at the forefront of technological development,” says Jesper Mailind. ”We can now offer our customers an even broader field of expertise, and we will have a strong starting point for solving future tasks. At the same time, we are creating better development opportunities for our employees, thereby becoming a more attractive place to work,” he says. NIRAS’ CEO, Carsten Toft Boesen, will be heading the merged company – The CEO of ALECTIA, Jesper Mailind, will be starting in a new position outside of the industry on 1 April 2017. FACTS ABOUT THE MERGER The merger will be completed with NIRAS as the continuing company, and the merged company will continue with NIRAS as its name an d brand. As the merger also requires the merger of the two foundations, it has to be approved by the Department of Civil Affairs, The Danish Business Authority, and the Danish Competition Authority. This is expected to be completed within three to six months. Only then will the actual integration be initiated.