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- Heimersson, Sara, 1984, et al.
(författare)
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LCA on wastewater and sludge management for local decision-making in Gothenburg – are new LCA method developments enough?
- 2019
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper describes an LCA study that was made to inform decision-makers in Gothenburg about two different sludge management options. Incineration of anaerobically digested sludge with recovery of a phosphorus fertiliser product seemed preferable to using pasteurised anaerobically digested sludge in agriculture. Aspects under the control of the decision-makers were important for overall results, and caused the main differences between the studied systems, indicating considerable potential for local improvement efforts. Applying a human toxicity characterisation method with a more sludge specific fate model were important, but not crucial, for the results. However, the results are connected to large uncertainties and remaining challenges are discussed in the paper.
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| 2. |
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| 3. |
- Modin, Oskar, 1980, et al.
(författare)
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A relationship between phages and organic carbon in wastewater treatment plant effluents
- 2022
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Ingår i: Water Research X. - : Elsevier BV. - 2589-9147. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- With stringent effluent requirements and the implementation of new processes for micropollutant removal, it is increasingly important for wastewater treatment plants (WWTPs) to understand the factors affecting effluent quality. Phages (viruses infecting prokaryotes) are abundant in the biological treatment processes. They can contribute to organic carbon in the treated effluent both because they are organic in nature and occur in the effluent and because they cause lysis of microorganisms. Today very little is known about the effects of phages on effluent quality. The goal of this study was, therefore, to determine the relationship between phages and organic carbon in WWTP effluents. We also examined the diversity, taxonomy, and host-association of DNA phages using metagenomics. Effluent samples were collected from four WWTPs treating municipal wastewater. Significant differences in both organic carbon and virus-like particle concentrations were observed between the plants and there was a linear relationship between the two parameters. The phage communities were diverse with many members being taxonomically unclassified. Putative hosts were dominated by bacteria known to be abundant in activated sludge systems such as Comamonadaceae. The composition of phages differed between the WWTPs, suggesting that local conditions shape the communities. Overall, our findings suggest that the abundance and composition of phages are related to effluent quality. Thus, there is a need for further research clarifying the association between phage dynamics and WWTP function.
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| 4. |
- Svanström, Magdalena, 1969, et al.
(författare)
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Life cycle assessment of sludge management with phosphorus utilisation and improved hygienisation in Sweden
- 2017
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Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 75:9, s. 2013-2024
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Tidskriftsartikel (refereegranskat)abstract
- To provide input to sewage sludge management strategies that address expected new regulations in terms of hygienisation and phosphorus recovery in Sweden, an environmental life cycle assessment (LCA) was made. The LCA identified environmental hot spots for methods that may permit sludge or phosphorus from sludge to be applied on agricultural land. In particular, thermophilic digestion, pasteurisation, thermal hydrolysis, urea treatment and mono-incineration with phosphorus recovery were compared. In addition, a sludge management system involving drying of sludge before use in forestry was investigated. The results showed that some major impacts are related to large uncertainties, such as those related to emissions from sludge storage. It also showed that large gains can be achieved when products from the systems replace other products, in particular when biogas is used to replace natural gas in vehicles, but also when sludge is used in agriculture and forestry. In general, there are small differences between the sludge management methods. Retaining the sludge matrix to allow for its utilisation in agriculture may conflict with keeping emissions to air and water from the sludge matrix low. It is recommended that any sludge management option minimises emissions from sludge to air and water and that resources are recovered and used, in line with the principles of a circular economy.
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| 5. |
- Sörelius, Helene, et al.
(författare)
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Utvärdering av biofilter vid HSB Living Lab : samlade erfarenheter och råd
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Föreliggande rapport är en del av forskningsprojektet ”Testbädd för fördröjning och rening av dagvatten”. Projektet är ett tvärvetenskapligt samarbetsprojekt mellan Göteborg stad, RISE Research Institutes of Sweden, Chalmers Tekniska Högskola, Luleå Tekniska Universitet, Gryaab, HSB och ett antal teknikföretag. Projektet är ett fyrårigt projekt som i huvudsak har finansierats av Vinnova, HSB, Göteborgs Stad och Gryaab.Centralt för projektet är de två testbäddsansläggningarna som uppförts på HSB Living Lab i Göteborg. Syftet med bäddarna var att fungera som en testarena för innovativa dagvattenlösningar. Under projektets löptid har två olika typer av biofilter utvärderats på platsen, eller som de också kallas raingardens, regnbädd eller växtbäddar. Denna rapport är en sammanställning av den information som samlats in kopplat till dessa två biofilter.HSB Living Lab är en forsknings och demonstrationsarena där HSB tillsammans med 12 olika samarbetspartners utvecklar nya sätt att bygga och forma framtidens boende. Stor vikt läggs på ny kunskap beträffande social, ekonomisk och ekologisk hållbarhet och nya smarta tekniska lösningar som kan användas i framtidens produktion. Huset är en flyttbar byggnad med fyra våningar där allt går att byta ut och förändra. En boendedel med studentbostäder och en utställningsdel där det finns kontor, möteslokal, show room för forskningsresultat, tvättstudio och mycket mer. Närmare 2000 sensorer mäter i realtid allt som pågår. Huset stod klart för inflyttning 1a juni 2016 och redan då fanns de två testbäddarna för utvärdering av lokal fördröjning med biofilter på plats.
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