Ändra sökning
Avgränsa sökresultatet
1 - 15 av 15
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Amofah, Lea Rastas
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Willow bed fertigated with domestic wastewater to recover nutrients in subarctic climates2012Ingår i: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 47, s. 174-181Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Conventional methods for wastewater treatment emphasise protecting human health, receiving waters and the environment. Consequently, they are generally designed to reduce pollutant levels and are not well-suited for creating resources. This paper describes a new, more sustainable and energy-efficient approach to wastewater treatment that satisfies health and environmental standards while also facilitating resource recovery. A full-scale compact willow bed was intensively fertigated with domestic wastewater in a cold climate to examine biomass production, the recovery of nutrients in willow biomass, and wastewater treatment. The performance of the willow bed was assessed for two years, covering three growing seasons. The studied frost-tolerant willow clones produced good biomass yields per unit area (6–7 ton dry matter/ha and year) under intensive fertigation with dense planting and continuous harvesting. The biomass yield of willow species exhibiting vertical growth seemed to be greater than that for lateral growth species in the dense stands studied. In contrast to biomass production, nutrient recovery was facilitated by intensive fertigation, continuous harvesting and less dense planting with a horizontally growing willow clone. The estimated nitrogen accumulation in above-ground biomass was 210 kg/ha and that of phosphorus was 30 kg/ha. 90% of the accumulated nutrients in the above-ground biomass were removed from the site during the experimental period. However, the quantity of nutrients accumulated in the willow biomass represented only a small fraction of the loaded or removed amount. The willow bed was shown to be an efficient prefilter for reducing the abundance of particulate and organic matter, leaving the bulk of the remaining nutrients in forms that could be recovered in subsequent treatment steps.

  • 2.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Activity: Resources - as a starting point for urban water planning2011Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    The use or non-use of resources is important for sustainable development of societies and the urban water systems. It is expected that if resources of the urban water system are placed in more focus in the planning process the development of sustainable urban water systems will be proceed further. The objective of this work is to systematically identify and group potential resources in the urban water system, with special focus on the wastewater. The results of this study are a resource matrix made on different levels of the urban water system and a list of factors influencing the value of latent resources and related to questions of system limits and cold climate perspectives. One question to be discussed is how results of the present analysis could be implemented in the planning process in order to improve a more efficient use of resources in urban water systems

  • 3.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Impacts on sewer performance due to changes to inputs in domestic wastewater2015Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The impacts of changes in domestic wastewater inputs on sewer performance have been debated since the dawn of the great sewer construction movement in the 1850s. Nowadays, typical household wastewater that enters sewers can generally be divided into streams from the WC, shower and/or bathtub, kitchen sink, washing machine and dishwasher. Changes in thecomposition of domestic wastewater entering a sewer will depend on inter alia the properties of the appliances used in the households and householders’ residential habits. Recent such changes with a potentially detrimental impact on sewer performance are increased levels of fat, oil and grease used in kitchen practices; the introduction of kitchen sink food waste disposers;and the installation of domestic water efficient appliances. The overall aim of this thesis was, from an historical perspective, to explore how recent changes to inputs in domestic wastewater can impact performance of sewer systems and how this relates to sewers as future carriers of domestic wastewater.Various methods to examine the aim have been employed. Two questionnaire surveys were distributed. The first was sent out to sewer operators/managers employed at Scandinavian public water utilities to explore their views on the extent of fat, oil and grease in sewer systems.The second was sent to sewer/operators managers employed at public water utilities in Northern Sweden to explore the extent of monitoring of incidents of blockages. Two field studies have also been undertaken. One entailed the investigation of long term impacts on sewer performance from the introduction of food waste disposers in housing areas. The other evaluated which parameters of domestic wastewater could be used to estimate levels of infiltration/ inflow into sewers. In addition, a case analysis was undertaken to assess future impacts on self-cleansing regimes in sewer networks when rural subarctic villages are retrofitted with water efficient appliances. A literature review was performed to identify and analyse studies examining changes to domestic wastewater the impact these changes may have on sewer systems,and their implications for sewer management. Responses from the first questionnaire survey suggested that an increase in blockages due tofat, oil and grease, in particular at pumping stations, was the most reported problem. Responses from the second questionnaire survey indicated that the extent of monitoring reoccurring blockage locations was found to be low, although two water utilities possessed GIS-systems which supported such endeavours. The first field study indicated that the level of in-sewerdeposition was observed to be increased when a pipe received high input of effluents from the kitchen sink disposers. This was observed to a further degree when a pipe had a gentle inclination combined with significant sagging along its length. From the second field study it was found that among compounds normally sampled to determine wastewater characteristic, the parameters Tot-N and Tot-P provided the closest fit to estimated levels of infiltration/inflowbased on water consumption rates. The case analysis indicated that the decrease in in-pipe velocities when all households are retrofitted with water saving appliances could be counteracted by sewer relining when water consumption rates did not drop below 130 l/hd.d. The impacts on sewer performance from these changes seemed to be dictated by many factors,e.g. household practices and the status of separate pipes. Therefore there is a need to put the changes to inputs in the context of larger societal trends to properly understand their full implications regarding future objectives when relying on the sewer as a carrier of domestic wastewater.

  • 4.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Matavfallskvarnar: Ett alternativ för ett framtida Kiruna?2011Rapport (Övrigt vetenskapligt)
  • 5.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Resurser inom VA-systemet: en förstudie för den nya Giron2011Rapport (Övrigt vetenskapligt)
  • 6.
    Mattsson, Jonathan
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Vatten- och avloppssystem för subarktiskt klimat: En förstudie för Nya Giron2011Rapport (Övrigt vetenskapligt)
  • 7.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Matavfallskvarnar: Långtidseffekter på ledningsnät2012Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Studien har undersökt långtidseffekter av matavfallskvarnar (MAK) på ledningsnät. MAK synes ha haft en påverkan, men denna var av mindre art. Ytterst sällan kunde någon större funktionsnedsättning påvisas.

  • 8.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    The incompatibility of food waste disposers with an aging sewer: Fact or Fiction?2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Impacts of food waste disposers (FWD) on the general condition of sewer systems has recently received more attention as a large number of municipalities are contemplating large scale introductions of the device. The main reasons behind the elevated interest are an increase in biogas generation from the anaerobic digester as well as a lesser demand for vehicle transportation of solid waste. Concerns have however been raised regarding potential problems in the sewer network such as accumulations of biofilms, sediments and fats. This paper discusses long term impacts of said parameters on the sewer system for the two municipalities Surahammar and Smedjebacken who decided to introduce FWD on a larger scale more than a decade ago. The study targeted areas which mainly were comprised of detached houses with concrete pipes laid during the 70s and plastic pipes from the 80s. In total, 146 pipes of a cumulative length of about 7000 meters were filmed. By applying one grading system as well as one weighing system for all the encountered deposits, it was possible to calculate a final score for each pipe which reflects the relative abundance of deposits. All final points were then analyzed statistically with regard to FWD-load, material and inclination using general linear regression. The result from the inspections indicated that FWD has an impact, albeit a minor one. Ungrounded egg shells were encountered in many places, in particular where there were sags present. The level of total amount of sediments was however not documented to be generally elevated when compared to pipes with few to none FWD. Biofilms and fats seemed to be slightly increased when in particular the ratio of households having installed a FWD upstream was high as well as for pipes which were installed with a gentle slope. As kitchen waste that was never intended for the FWD in the first place has been documented in the sewer, there also seems to be a further demand for informational campaigns regarding the operation of the device.

  • 9.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Ashley, Richard
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Impacts and managerial implications for sewer systems due to recent changes to inputs in domestic wastewater: a review2015Ingår i: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 161, s. 188-197Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ever since the advent of major sewer construction in the 1850s, the issue of increased solids deposition in sewers due to changes in domestic wastewater inputs has been frequently debated. Three recent changes considered here are the introduction of kitchen sink food waste disposers (FWDs); rising levels of inputs of fat, oil and grease (FOG); and the installation of low-flush toilets (LFTs). In this review these changes have been examined with regard to potential solids depositional impacts on sewer systems and the managerial implications. The review indicates that each of the changes has the potential to cause an increase in solids deposition in sewers and this is likely to be more pronounced for the upstream reaches of networks that serve fewer households than the downstream parts and for specific sewer features such as sags. The review has highlighted the importance of educational campaigns directed to the public to mitigate deposition as many of the observed problems have been linked to domestic behaviour in regard to FOGs, FWDs and toilet flushing. A standardized monitoring procedure of repeat sewer blockage locations can also be a means to identify depositional hot-spots. Interactions between the various changes in inputs in the studies reviewed here indicated an increased potential for blockage formation, but this would need to be further substantiated. As the precise nature of these changes in inputs have been found to be variable, depending on lifestyles and type of installation, the additional problems that may arise pose particular challenges to sewer operators and managers because of the difficulty in generalizing the nature of the changes, particularly where retrofitting projects in households are being considered. The three types of changes to inputs reviewed here highlight the need to consider whether or not more or less solid waste from households should be diverted into sewers.

  • 10.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Bridging the gap between sewer status and new sewer inputs: A decision support tool to predict the effect of food waste disposers’ effluent on small-diameter sewers2013Konferensbidrag (Refereegranskat)
  • 11.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Indicators for blockages caused by changing wastewater – How well does a municipality need to know its sewer?2014Konferensbidrag (Refereegranskat)
  • 12.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Long-term impacts on sewers following food waste disposer installation in housing areas2014Ingår i: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 35, nr 21, s. 2643-2651Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To increase biogas generation and decrease vehicle transportation of solid waste, the integration of food waste disposers (FWDs) into the wastewater system has been proposed. However, concerns have been raised about the long-term impact of the additional load of the FWDs on sewer systems. To examine said impact, this study has used CCTV(closed-circuit television) inspection techniques to evaluate the status of 181 concrete pipes serving single family housing areas with a diameter of 225 mm, ranging from a 100% connection rate of households with an FWD to none. A minor study was also performed on a multi-family housing area, where mainly plastic pipes (200 mm) were used. The extent and distribution of deposits related to the ratio of FWDs, inclination and pipe sagging (backfalls) was ascertained by using linear regression and analysis of variance (ANOVA). The results showed that FWDs have had an impact on the level of deposits in the sewer, but this has, in turn, been of minor significance. With a high connection rate of FWDs upstream of a pipe, the extent of the total level of deposits, as well as finer sediments, was statistically determined to be greater. However, the majority of the deposits were observed to be small which would suggest the impact of FWDs on sewer performance to be minor. As food waste not compatible with the FWD was seen in the sewers, educational campaigns could be beneficial to further lower the risks of sewer blocking.

  • 13.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Blecken, Godecke-Tobias
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Fat, Oil, and Grease Accumulation in Sewer Systems: Comprehensive Survey of Experiences of Scandinavian Municipalities2014Ingår i: Journal of environmental engineering, ISSN 0733-9372, E-ISSN 1943-7870, Vol. 140, nr 3, artikel-id 4014003Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Problems with fat, oil, and grease (FOG) in sewer systems have received relatively little attention, although in the longer term this might imply (inter alia) blockages and sanitary overflows. Therefore, the experiences of Swedish and Norwegian executive water engineers concerning FOG-related issues were assessed using a comprehensive questionnaire that was distributed to all Swedish and Norwegian municipalities (with a response rate of 35% and 25% in Sweden and Norway, respectively). Blockages caused by FOG in sewers and pumping stations were the most prevalent reported problem, followed by increased demand for line flushing. The water engineers singled out city centers as the areas whose sewers had the most severe problems with FOG buildups. Most municipalities mandated the use of grease interceptors (GIs) by businesses, but the maintenance and functional status of these devices were reported to be inadequate. Commonly, water engineers had faith in the functioning of the GI despite the lack of stringent inspections. Where FOG collection systems had been implemented, they generally targeted businesses and other enterprises rather than private households. Because problems caused by FOG buildups are likely to become more common in the future, it is important that prevention strategies characterize management to a higher degree than ones based on removal.

  • 14.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten. S-Group Solutions, Malmö.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Westerlund, Lars
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Dahl, Jan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Ashley, Richard
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Impacts on rural wastewater systems in subarctic regions due to changes in inputs from households2018Ingår i: Journal of cold regions engineering, ISSN 0887-381X, E-ISSN 1943-5495, Vol. 32, nr 1, artikel-id 04017019Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The use of water-saving appliances and heat exchangers is becoming increasingly popular to decrease water consumption and recover energy from preheated water. However, such in-household changes can bring particular implications for subarctic rural areas, in terms of solids deposition in sewers and drops in performance of wastewater treatment plants (WWTPs), because these are already experiencing diminishing wastewater flows due to depopulation and seasonal dips in wastewater temperature resulting from infiltration into sewers. Hence, this study has considered two communities in Sweden, postulating three different cases with various scales of retrofitting and usage. The results indicate that the decrease in in-pipe velocities when all households are retrofitted with water-saving appliances could be counteracted by sewer relining, but not by the inclusion of a conventional estimate of infiltration. However, for the case in which retrofitting was combined with decreased usage of the appliances, the decrease in self-cleansing capacity could not be counteracted. The retrofitting of heat exchangers under shower trays in all households did not have a significant effect on treatment processes at the WWTP.

  • 15.
    Mattsson, Jonathan
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Mattsson, Ann E.
    Gryaab AB, Utveckling, Kvalitet och miljö, Göteborg.
    Davidsson, Fredrik
    Gryaab AB, Utveckling, Kvalitet och miljö, Göteborg.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Österlund, Helene
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Viklander, Maria
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Normalization of Wastewater Quality to Estimate Infiltration/Inflow and Mass Flows of Metals2016Ingår i: Journal of environmental engineering, ISSN 0733-9372, E-ISSN 1943-7870, Vol. 142, nr 11, artikel-id 4016050Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The quality of wastewater varies between catchments due to variation in urbanisation, sewer system properties, and pollution levels. This study was conducted to identify wastewater quality parameters that could be normalized to estimate levels of infiltration/inflow (I/I) in selected catchments and to investigate the geographic origins of metals entering sewer systems. Two sampling campaigns were conducted in the five catchments of the Gothenburg area focusing on 14 water quality parameters. Data from a reference study on domestic wastewater quality to normalize the mass flows associated with pure domestic wastewater was applied. The level of dilution due to I/I in wastewater entering Rya Wastewater Treatment Plant, estimated using Tot-N and Tot-P as indicators, provided the closest fit among the water quality parameters with results obtained by established methods for the two campaigns. The results from the study also indicated which catchments generated nondomestic wastewater with higher mass flows of specified metals.

1 - 15 av 15
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf