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Pericault, Y., Risberg, M., Viklander, M. & Hedström, A. (2020). Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground. Tunnelling and Underground Space Technology, 97, Article ID 103261.
Öppna denna publikation i ny flik eller fönster >>Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground
2020 (Engelska)Ingår i: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 97, artikel-id 103261Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Heat-traced utility corridors (utilidors) can be used in cold regions to install the drinking water and sewer pipes in a shallow trench above the frost depth, thereby limiting excavation needs and the associated economic, social, and environmental costs. Several of these infrastructures were built in the 60s and 70s in Canada, Alaska, Russia, and Norway. More recently, a new type of heat-traced utilidor was built as a pilot project in Kiruna, Sweden to increase the viability of district heating in the area by allowing co-location of all the utility pipes in a shallow trench. Despite several reported cases of undesirably warm drinking water from full-scale projects, previous research efforts on heat-traced utilidors have mainly focused on pipe freeze protection, not on the prevention of excessive temperatures of the drinking water. To ensure comfortable drinking water in terms of taste and smell, an upper temperature limit of 15 °C is usually recommended. The objective of this study was to evaluate the long-term ability of a heat-traced utilidor to maintain sewer temperatures above 0 °C and drinking water temperatures between 0 and 15 °C. Pipe temperatures were measured continuously at two cross sections of a heat-traced utilidor located in Northern Sweden over a period of 22 months. A thermal model, set up and calibrated on the measurements, was used to simulate the impact of extraordinary cold weather conditions on the pipes’ temperatures. The results showed that the utilidor could keep the pipe temperatures within the desired ranges in most cases but that special care should be taken during design to limit drinking water temperatures during the summer.

Ort, förlag, år, upplaga, sidor
Elsevier, 2020
Nyckelord
Drinking water distribution, Drinking water temperature, Sewage collection, Low temperature district heating, Pipe insulation, Freeze protection
Nationell ämneskategori
Vattenteknik Infrastrukturteknik Energiteknik
Forskningsämne
VA-teknik; Energiteknik
Identifikatorer
urn:nbn:se:ltu:diva-73076 (URN)10.1016/j.tust.2019.103261 (DOI)000514214800034 ()
Forskningsfinansiär
Vinnova, 2014-04287Forskningsrådet Formas, 2011-1710
Anmärkning

Validerad;2020;Nivå 2;2020-01-29 (johcin)

Tillgänglig från: 2019-03-01 Skapad: 2019-03-01 Senast uppdaterad: 2020-04-01Bibliografiskt granskad
Garmabaki, A. S., Marklund, S., Thaduri, A., Hedström, A. & Kumar, U. (2020). Underground pipelines and railway infrastructure: failure consequences and restrictions. Structure and Infrastructure Engineering, 16(3), 412-430
Öppna denna publikation i ny flik eller fönster >>Underground pipelines and railway infrastructure: failure consequences and restrictions
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2020 (Engelska)Ingår i: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 16, nr 3, s. 412-430Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Underground pipelines are an essential part of the transportation infrastructure. The structural deterioration of pipelines crossing railways and their subsequent failures can entail critical consequences for society and industry, resulting in direct and indirect costs for all the stakeholders involved. Therefore, continuous and accurate condition assessment is critical for the effective management and maintenance of pipeline networks within the transportation infrastructure. The aim of this study has been to identify failure modes and consequences related to pipelines crossing railway corridors. Expert opinions have been collected through interviews and two sets of questionnaires have been distributed to the 291 municipalities in Sweden, with 137 responses in total. The failure analysis has revealed that pipe deformation has the highest impact, followed by pipe rupture at locations where pipelines cross railway infrastructure. For underground pipelines under railway infrastructure, ageing and the external load were awarded a higher ranking than other potential causes of pipeline failure.

Authors gratefully acknowledge the funding provided by Sweden’sinnovation agency, Vinnova, through the strategic innovation programmeInfraSweden2030. The funding was granted in a competitiveapplication process that assessed replies to an open call for proposalsconcerning “Condition Assessment and Maintenance of TransportInfrastructure (Grant No. 2016-033113)”.

Authors gratefully acknowledge the technical support and collaboration(In-kind support) of Arrsleff R€orteknik at Sweden, Luleå RailwayResearch Center (JVTC), Stormwater&Sewers and the SwedishTransport Administration (Trafikverket). In addition, the authors arethankful to the anonymous referees for their constructive commentsand Dr Matthias Asplund and Dr Masoud Naseri for their support andsuggestions.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2020
Nyckelord
Pipes, pipelines, renovation, maintenance, inspection, maintenance debt, life cycle costs, failure modes, axial loads, pipeline-railway crossings
Nationell ämneskategori
Tillförlitlighets- och kvalitetsteknik Vattenteknik Annan samhällsbyggnadsteknik
Forskningsämne
Drift och underhållsteknik; VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-76470 (URN)10.1080/15732479.2019.1666885 (DOI)000487636800001 ()2-s2.0-85073959583 (Scopus ID)
Projekt
PipeXrail
Forskningsfinansiär
Vinnova, 2016-033113
Anmärkning

Validerad;2020;Nivå 2;2020-01-28 (johcin)

Tillgänglig från: 2019-10-22 Skapad: 2019-10-22 Senast uppdaterad: 2020-01-28Bibliografiskt granskad
Garmabaki, A. S., Thaduri, A., Hedström, A., Kumar, U., Laue, J., Marklund, S., . . . Indahl, S. (2019). A Survey on Underground Pipelines and Railway Infrastructure at Cross-Sections. In: Michael beer, Enrico Zio (Ed.), ESREL-2019: . Paper presented at ESREL 2019 | European Safety and Reliability Conference.
Öppna denna publikation i ny flik eller fönster >>A Survey on Underground Pipelines and Railway Infrastructure at Cross-Sections
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2019 (Engelska)Ingår i: ESREL-2019 / [ed] Michael beer, Enrico Zio, 2019Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Underground pipelines are an essential part of the transportation infrastructure. The structural deterioration of pipelines crossing railways and their subsequent failures are critical for society and industry resulting in direct and indirect costs for all the related stakeholders. Pipeline failures are complex processes, which are affected by many factors, both static (e.g., pipe material, size, age, and soil type) and dynamic (e.g., traffic load, pressure zone changes, and environmental impacts). These failures have serious impacts on public due to safety, disruption of traffic, inconvenience to society, environmental impacts and shortage of resources. Therefore, continuous and accurate condition assessment is critical for the effective management and maintenance of pipeline networks within transportation infrastructure. The aim of this study is to identify failure modes and consequences related to the crossing of pipelines in railway corridors. Expert opinion have been collected through two set of questionnaires which have been distributed to the 291 municipalities in the whole Sweden. The failure analysis revealed that pipe deformation has higher impact followed by pipe rupture at cross-section with railway infrastructure. For underground pipeline under railway infrastructure, aging and external load gets higher ranks among different potential failure causes to the pipeline.

Nyckelord
Underground Pipelines, Transportation Infrastructure, Railway, Maintenance, FMEA
Nationell ämneskategori
Tillförlitlighets- och kvalitetsteknik Vattenteknik Geoteknik
Forskningsämne
Byggkonstruktion; Trafikteknik
Identifikatorer
urn:nbn:se:ltu:diva-76471 (URN)10.3850/978-981-11-2724-3_0037-cd (DOI)978-981-11-2724-3 (ISBN)
Konferens
ESREL 2019 | European Safety and Reliability Conference
Projekt
PipeXrail
Forskningsfinansiär
Vinnova, 2016-033113
Anmärkning

We gratefully acknowledge the funding provided by Sweden’s Innovation Agency, Vinnova, through the Strategic Innovation Programme InfraSweden2030. The funding was granted in competition within the Open Call “Condition assessment and maintenance of transport infrastructure – Grant No. 2016-033113”. In addition, the technical support and collaboration of, Arrsleff Rörteknik, Luleå Railway Research Center (JVTC) and the Swedish Transport Administration (Trafikverket) are greatly appreciated

Tillgänglig från: 2019-10-22 Skapad: 2019-10-22 Senast uppdaterad: 2019-11-22
Vidal, B., Hedström, A., Barraud, S., Kärrman, E. & Herrmann, I. (2019). Assessing the sustainability of on-site sanitation systems using multi-criteria analysis. Environmental Science: Water Research & Technology, 5, 1599-1615
Öppna denna publikation i ny flik eller fönster >>Assessing the sustainability of on-site sanitation systems using multi-criteria analysis
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2019 (Engelska)Ingår i: Environmental Science: Water Research & Technology, ISSN 2053-1400, Vol. 5, s. 1599-1615Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Small on-site sanitation systems are widely present in suburban and rural areas in many countries. As these systems often underperform and have an impact on receiving waters, understanding their overall sustainability is of interest for policy and decision-makers. However, the definition and estimation of indicators defining sustainability are challenging, as it is finding the methodological approach to combine qualitative and quantitative indicators into one comprehensive assessment. In this study, twelve indicators defined by environmental, economic, social, technical and health-related criteria were used to compare nine alternatives of on-site sanitation for single households. A non-compensatory method for multi-criteria decision analysis, ELECTRE III, was used for the assessment together with weights assigned to each indicator by a reference group. Several scenarios were developed to reflect different goals and a sensitivity analysis was conducted. Overall, the graywater–blackwater separation system resulted as the most sustainable option and, in terms of polishing steps for phosphorus removal, chemical treatment was preferred over the phosphorus filter, both options being implemented together with sand filters. Assessing the robustness of the systems was a crucial step in the analysis given the high importance assigned to the aforementioned indicator by the stakeholders, thus the assessment method must be justified. The proposed multi-criteria approach contributes to aid the assessment of complex information needed in the selection of sustainable sanitation systems and in the provision of informed preferences.

Ort, förlag, år, upplaga, sidor
Cambridge: Royal Society of Chemistry, 2019
Nyckelord
ELECTRE III, package plant, phosphorus removal, sand filter, small-scale, source separation
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-75465 (URN)10.1039/c9ew00425d (DOI)000482436200009 ()
Forskningsfinansiär
Forskningsrådet Formas, 942-2015-758
Anmärkning

Validerad;2019;Nivå 2;2019-09-13 (johcin)

Tillgänglig från: 2019-08-09 Skapad: 2019-08-09 Senast uppdaterad: 2019-09-13Bibliografiskt granskad
Pericault, Y., Bruaset, S., Ugarelli, R., Viklander, M. & Hedström, A. (2019). Correcting for the impact of past coordination on the estimation of pipe cohorts survival functions. In: : . Paper presented at 9th International Conference on Sewer Processes & Networks, Aalborg Denmark, August 27-30 2019.
Öppna denna publikation i ny flik eller fönster >>Correcting for the impact of past coordination on the estimation of pipe cohorts survival functions
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2019 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Nyckelord
Asset management, coordinated replacement, cohort survival functions
Nationell ämneskategori
Vattenteknik Infrastrukturteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-75082 (URN)
Konferens
9th International Conference on Sewer Processes & Networks, Aalborg Denmark, August 27-30 2019
Forskningsfinansiär
Forskningsrådet Formas
Tillgänglig från: 2019-06-27 Skapad: 2019-06-27 Senast uppdaterad: 2019-09-20
Søberg, L., Viklander, M., Blecken, G.-T. & Hedström, A. (2019). Reduction of Escherichia coli, Enterococcus faecalisand Pseudomonas aeruginosa in stormwater bioretention: Effect of drying, temperature and submerged zone. Journal of Hydrology X, 3, Article ID 100025.
Öppna denna publikation i ny flik eller fönster >>Reduction of Escherichia coliEnterococcus faecalisand Pseudomonas aeruginosa in stormwater bioretention: Effect of drying, temperature and submerged zone
2019 (Engelska)Ingår i: Journal of Hydrology X, ISSN 2589-9155, Vol. 3, artikel-id 100025Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The impact of drying and temperature on the reduction of Escherichia coliEnterococcus faecalis and Pseudomonas aeruginosa in stormwater bioretention systems with and without a submerged zone was assessed using 16 pilot-scale bioretention columns under controlled laboratory conditions. The experimental design enabled analysis of possible interactions between the factors. First outflow and event-based samples were collected. Outflow concentrations were independent of inflow concentrations and hence controlled by internal processes. Overall TSS removal was high but sensitive to bacterial synthesis. Event-based samples had significantly higher bacteria concentrations than first outflow samples, suggesting that remaining/surviving bacteria in the bioretention cells have little effect on initial peak outflow concentrations. The effect of temperature varied between bacterial species and sample types. Long dry periods seemed beneficial for bacteria reduction, but outflow bacteria concentrations peaked during the second watering after long dry periods. Submerged zones significantly reduced bacteria outflow concentrations. However, sudden temperature increases caused bioretention cells with a submerged zone to produce significantly higher bacteria outflow concentrations than before the temperature increase, which was not the case for standard cells. Bioretention cells with submerged zones may thus be poor choices for reducing bacterial concentrations in stormwater runoff in areas experiencing winter conditions. Finally, our results suggest that adsorption (e.g. further enhanced by biofilm formation) is the major mechanism governing bacteria reduction in bioretention systems.

Ort, förlag, år, upplaga, sidor
Elsevier, 2019
Nyckelord
Bacteria, Submerged zone, Stormwater, Bioretention, Winter performance, Wet and dry periods
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-73082 (URN)10.1016/j.hydroa.2019.100025 (DOI)
Tillgänglig från: 2019-03-01 Skapad: 2019-03-01 Senast uppdaterad: 2019-04-15Bibliografiskt granskad
Vidal, B., Herrmann, I. & Hedström, A. (2019). Små avloppssystem: hur hållbara är de?. Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>Små avloppssystem: hur hållbara är de?
2019 (Svenska)Övrigt (Övrig (populärvetenskap, debatt, mm))
Abstract [sv]

Små avloppssystem släpper ut avloppsvattnet lokalt, och därför är det viktigt att systemen uppfyller de krav som finns för utsläpp av organiskt material och näringsämnen och även klarar krav på smittskydd. Ofta fungerar, tyvärr, de små systemen inte som de borde, och när anläggningar ska uppgraderas eller när det ska byggas nya system bör det ske med tanke på hållbarheten. I ett nyligen avslutat projekt har vi arbetat med små avloppssystem i relation till hållbarhetskriterier och olika scenarier. Studien visar att det är viktigt att sätta upp mål och prioriteringar när man ska välja avloppslösning. Vilket som är det mest hållbara alternativet beror på vilka aspekter som prioriteras.

Ort, förlag, år, sidor
Luleå tekniska universitet, 2019. s. 8
Serie
Artikelserie Ny forskning och teknik ; 8
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-77182 (URN)
Tillgänglig från: 2019-12-16 Skapad: 2019-12-16 Senast uppdaterad: 2020-02-18Bibliografiskt granskad
Panasiuk, O., Hedström, A., Ashley, R., Marsalek, J. & Viklander, M. (2019). The feasibility of using flap gates as constriction flow meters for estimating sanitary sewer overflows (SSO). Desalination and Water Treatment, 155, 113-119
Öppna denna publikation i ny flik eller fönster >>The feasibility of using flap gates as constriction flow meters for estimating sanitary sewer overflows (SSO)
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2019 (Engelska)Ingår i: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 155, s. 113-119Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Increased awareness of the negative effects of sanitary sewer overflow (SSO) events on human health and aquatic life led to the development of various control measures, of which implementation is impeded by the lack of information on SSO occurrences, flows and volumes. The collection of such information requires data acquisition systems, which can be costly and are fully utilized just during limited time periods of the year. In search for inexpensive approaches to SSO monitoring, the feasibility of using existing flap gate installations, serving for prevention of back-up flows into sewers, as constriction flow meters was investigated, with promising results. An experimental pilotscale setup was designed to allow steady water flow through a flap gate built into a partition wall between two chambers. The stabilized water heads in the chambers and the flow rate through the flap gate were measured, for both dry and submerged flap gate conditions, and five flap gate sizes (200, 300, 400, 500 and 600 mm), with relatively heavy covers (6–102 kg). The measured data were used to develop flow rating curves, by non-linear regression, in the form Q = f (ΔH), where Q is the discharge through the flap gate and ΔH is the pressure differential upstream and downstream of the gate. The regression curves fitted the experimental data with high precision (R2 >0.99). The use of flow rating curves for estimation of the SSO volume was discussed. This study demonstrated that the water head measurements upstream and downstream of the flap gate can provide a reliable, accurate and inexpensive method for quantification of the SSO discharges and volumes.

Ort, förlag, år, upplaga, sidor
Desalination Publications, 2019
Nyckelord
Flap gates, Sanitary sewer overflows (SSO), SSO volumes
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-74804 (URN)10.5004/dwt.2019.24011 (DOI)000470121900011 ()2-s2.0-85067931662 (Scopus ID)
Anmärkning

Validerad;2019;Nivå 2;2019-06-20 (johcin)

Tillgänglig från: 2019-06-20 Skapad: 2019-06-20 Senast uppdaterad: 2019-08-19Bibliografiskt granskad
Nyström, F., Nordqvist, K., Herrmann, I., Hedström, A. & Viklander, M. (2019). Treatment of road runoff by coagulation/flocculation and sedimentation. Water Science and Technology, 79(3), 518-525
Öppna denna publikation i ny flik eller fönster >>Treatment of road runoff by coagulation/flocculation and sedimentation
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2019 (Engelska)Ingår i: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 79, nr 3, s. 518-525Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A laboratory investigation of the treatment potential of a coagulation process in the context of stormwater treatment was undertaken. The initial 25 L road runoff generated from four rain events was collected and subjected to a jar-testing regime with two commercial coagulants. The treatment effect was assessed by analysing the runoff before and after treatment for turbidity, suspended solids and metal content. The coagulation process resulted in particle and total metal reduction of more than 90% compared to 40% for only sedimentation. Up to 40% reduction of dissolved Cr, Cu and Pb was also observed compared to 0% for sedimentation. This study shows that coagulation may be a useful process for stormwater treatment systems when the treatment requirements are high.

Ort, förlag, år, upplaga, sidor
IWA Publishing, 2019
Nyckelord
advanced stormwater treatment, coagulation, metals, particles, road runoff, suspended solids
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-73090 (URN)10.2166/wst.2019.079 (DOI)30924806 (PubMedID)2-s2.0-85063686388 (Scopus ID)
Forskningsfinansiär
Forskningsrådet Formas, 2016-20075Forskningsrådet Formas, 2016-01447
Anmärkning

Validerad;2019;Nivå 2;2019-04-08 (oliekm)

Tillgänglig från: 2019-03-01 Skapad: 2019-03-01 Senast uppdaterad: 2019-08-16Bibliografiskt granskad
Panasiuk, O., Hedström, A., Langeveld, J., de Haan, C., Liefting, E., Schilperoort, R. & Viklander, M. (2019). Using Distributed Temperature Sensing (DTS) for Locating and Characterising Infiltration and Inflow into Foul Sewers before, during and after Snowmelt Period. Water, 11(8), Article ID 1529.
Öppna denna publikation i ny flik eller fönster >>Using Distributed Temperature Sensing (DTS) for Locating and Characterising Infiltration and Inflow into Foul Sewers before, during and after Snowmelt Period
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2019 (Engelska)Ingår i: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 11, nr 8, artikel-id 1529Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Infiltration and inflow (I/I) into sewers cause negative effects on the sewer system,wastewater treatment plant and environment. Identifying the causes and locating the inflows isnecessary in order to address the I/I problem. This paper focuses on using distributed temperaturesensing (DTS) for identifying, locating and characterising I/I into a sewer system during the endof winter–beginning of summer transition period under dry and wet weather conditions. Duringsnowmelt, several locations with I/I were identified, while these locations did not show I/I duringstorm events after the snowmelt. In addition, during a very heavy storm after the snowmelt period,I/I was found at other locations. Therefore, DTS was demonstrated to be effective in identifying thetype of I/I and in locating I/I. Finally, I/I monitoring campaigns in cold climates should take intoaccount the variety of pathways of I/I during snowmelt and during rainfall.

Ort, förlag, år, upplaga, sidor
MDPI, 2019
Nyckelord
distributed temperature sensing, infiltration and inflow, snowmelt, foul sewers
Nationell ämneskategori
Vattenteknik
Forskningsämne
VA-teknik
Identifikatorer
urn:nbn:se:ltu:diva-75547 (URN)10.3390/w11081529 (DOI)000484561500004 ()2-s2.0-85070252913 (Scopus ID)
Forskningsfinansiär
Forskningsrådet Formas, 2012-618Vinnova, 2011-03232
Anmärkning

Validerad;2019;Nivå 2;2019-08-19 (marisr)

Tillgänglig från: 2019-08-15 Skapad: 2019-08-15 Senast uppdaterad: 2019-10-08Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-9541-3542

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