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Hamisi, R., Renman, A., Renman, G., Wörman, A. & Thunvik, R. (2024). Optimization of on-site wastewater treatment efficiency and recovery based on nutrient mobility and adsorption kinetics modelling using HYDRUS-2D coupled with PHREEQC. Chemical Engineering Journal, 492, Article ID 152308.
Open this publication in new window or tab >>Optimization of on-site wastewater treatment efficiency and recovery based on nutrient mobility and adsorption kinetics modelling using HYDRUS-2D coupled with PHREEQC
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2024 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 492, article id 152308Article in journal (Refereed) Published
Abstract [en]

A closed-loop on-site wastewater treatment system (OWT) was studied comprising steps of septic tank to remove organics (Biological Oxygen Demand (BOD)), biofiltration clarifier for biological removal of nitrogen (N), phosphorus (P) and BOD, reactive Polonite® filter for chemical adsorption and precipitation removal of dissolved P, and tidal flow constructed wetland (TFCW) sand filter for polishing the effluent to low P and N effluent Swedish standards. The field experimental data that have been used to optimize TFCW design in the numerical modelling using HYDRUS-2D coupled with and without PHREEQC indicated that the adsorption efficiency of the reactive Polonite® adsorbent was nearly double to that obtained in TFCW sand filters for PO4-P (95 %) and Total-P (85 %) removal in summer at a high temperature range (15.4–18.8 °C) and pH range (9.9–10.8). The weaker PO4-P (53 %) and Total-P (25 %) removal efficiency in winter was due to a low temperature (1.5–8.1 °C) and low pH (7.2–7.9). This decrease in pH was attributed to salinity in the domestic wastewater and dilution of rainwater. Modelling results revealed that the transport mechanisms and rate of P adsorption kinetics in the TFCW sand filters enhanced with calcium and iron flow from chemical dissolution in the preceding Polonite® adsorbent was increased with the increase in temperature. However, the P adsorption was less sensitive at high ferrihydrite (Fe(OH)3) dose, suggesting limited effects of cations dissolution and abundance of metal oxides and hydroxide ions at the mineral surface for anions exchange with phosphate for surface complexation. The strategy of combining field data and modelling provided valuable insights for assessing adaptability and optimizing TFCW design under variable fluxes and scenario effects of insulated/uninsulated and dilution by rainwater in cold-climate regions.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Hydrogeochemical modelling, Nitrogen, Optimization, Phosphorus, Tidal flow constructed wetland
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-347045 (URN)10.1016/j.cej.2024.152308 (DOI)2-s2.0-85193900296 (Scopus ID)
Note

QC 20240531

Available from: 2024-05-30 Created: 2024-05-30 Last updated: 2024-05-31Bibliographically approved
Hamisi, R., Renman, A., Renman, G., Wörman, A. & Thunvik, R. (2024). Treatment efficiency and recovery in sand filters for on-site wastewater treatment: Column studies and reactive modelling. Journal of Cleaner Production, 462, Article ID 142696.
Open this publication in new window or tab >>Treatment efficiency and recovery in sand filters for on-site wastewater treatment: Column studies and reactive modelling
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2024 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 462, article id 142696Article in journal (Refereed) Published
Abstract [en]

This study examined the adsorption capacity and treatment efficiency of sand filters in on-site treatment systems for cold climate regions. The effects of different operating conditions, porosity and kinetics parameters were investigated in column experiments and COMSOL Multiphysics® modelling, to comprehensively reveal the mechanisms and optimize treatment efficiency of nitrogen (N) and phosphorus (P) removal in a field tidal flow constructed wetland (TFCW), treating effluent from a package treatment plant with P filter material. The results from column experiments with sand showed that Total-P adsorption rate was dependent on feed water quality (Septic tank >0.77 ± 0.06 g kg−1; Biotreatment >0.41 ± 0.07 g kg−1; Reactive material Polonite® <0.18 ± 0.07 g kg−1). In the field TFCW trial, Total-P adsorption in the top layer (>1.42 ± 0.55 g kg−1) and middle layer (>1.06 ± 0.51 g kg−1) was twice that in laboratory columns, due to strong interaction with the air-water interface and use of fluctuated domestic wastewater solutions. The breakthrough curve (BTCs) of the coarse sand matched the physical behaviour of tracer electrical conductivity (EC) in effluent from the sand column experiments. The modelling results demonstrated that high filter porosity and low hydraulic load were significant factors for optimal removal of NH4–N, Total-N, PO4–P, Total- P in the top layer (>99.95 ± 0.03 %, 44.37 ± 28.75%, 70.89 ± 28.30%, 76.18 ± 20.3%), middle layer (>98.94 ± 1.77%, 18.23 ± 23.04%, 76.62 ± 28.73%, 65.40 ± 31.85%) and deep layer (>99.99 ± 0.02%, 65.50 ± 20.64%, 75.53 ± 23.16%, 41.54 ± 28.81%) in the TFCW system, respectively. The results show that on-site wastewater treatment in cold climate TFCW can be applied as a technology to polish effluent from a three-step pretreatment system. However, hydraulic optimization is an important factor for the design of the TFCW to receive a successful long-term operating system.

Place, publisher, year, edition, pages
Elsevier Ltd, 2024
Keywords
Adsorption, Nitrogen, Optimization, Phosphorus, Reactive transport modelling, Tidal flow constructed wetland
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-347284 (URN)10.1016/j.jclepro.2024.142696 (DOI)001249422800001 ()2-s2.0-85194418681 (Scopus ID)
Note

QC 20240702

Available from: 2024-06-10 Created: 2024-06-10 Last updated: 2024-07-02Bibliographically approved
Hallberg, M., Renman, A., Berndtsson, L. & Renman, G. (2022). Evaluation of a sand filter material for road runoff treatment- pilot-scale field trial focused on copper and zinc removal. Water practice and technology, 17(8), 1652-1665
Open this publication in new window or tab >>Evaluation of a sand filter material for road runoff treatment- pilot-scale field trial focused on copper and zinc removal
2022 (English)In: Water practice and technology, E-ISSN 1751-231X, Vol. 17, no 8, p. 1652-1665Article in journal (Refereed) Published
Abstract [en]

The effects of stormwater discharges on receiving aquatic environments and the need for their purification were highlighted by an EU court in May 2020. The ruling stated the need for removal of dissolved pollutants, which justifies field studies for development of far-reaching methods for runoff treatment. In this study, a standard sand was used as medium for road runoff filtration and removal of dissolved and particle-bound (<0.45 mu m) zinc (Zn) and copper (Cu). Data included 24 road runoff events, mimicking the flow variations and pollutant emissions over a seven-month period. The findings showed that sand can be used to remove Zn and Cu from road runoff in a gravity fed treatment system at a surface load ranging from 16.8 to 201 L m(-2) h(-1). The removal of total Zn and Cu was 93 and 67%, respectively. Dissolved Zn was efficiently removed by the sand (87%), however not Cu (19%). The sand efficiently removed total suspended solids (TSS) from the maximum occurring 443 mg L-1 to below 5 mg L-1. No head loss due to the TSS loadings was observed. The sand's potential to remove the investigated metals was shown, but in the longer term, effluent concentrations may exceed permitted values.

Place, publisher, year, edition, pages
IWA Publishing, 2022
Keywords
clogging, column experiment, dissolved metals, head loss, road runoff treatment plant, stormwater
National Category
Water Engineering Analytical Chemistry Other Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-318239 (URN)10.2166/wpt.2022.091 (DOI)000847040300007 ()2-s2.0-85137063503 (Scopus ID)
Note

QC 20220920

Available from: 2022-09-20 Created: 2022-09-20 Last updated: 2022-09-20Bibliographically approved
Hamisi, R., Renman, A., Renman, G., Wörman, A. & Thunvik, R. (2022). Long-term phosphorus sorption and leaching in sand filters for onsite treatment systems. Science of the Total Environment, 833, 155254-155254, Article ID 155254.
Open this publication in new window or tab >>Long-term phosphorus sorption and leaching in sand filters for onsite treatment systems
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2022 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 833, p. 155254-155254, article id 155254Article in journal (Refereed) Published
Abstract [en]

The sorption capacities of sand filters used for onsite wastewater treatment and their associated risks of phosphorus (P) leaching on contact with rainwater were investigated in column experiments and with modelling tool for over 300 days. Columns packed with sand were exposed to real domestic wastewater of different characteristics and hydraulic loading modes. The wastewater fed into the columns was effluent collected from three different treatment units in the field: a septic tank (ST), biofiltration tank (BF) and Polonite® filter bag (PO). The risk of P leaching to groundwater and surface water was also assessed, by exposing the same sand columns to natural rainwater. Overall results indicated that sand soils can exhibit different adsorption and desorption capacities for electrical conductivity (EC), Total-P, phosphate-P and total suspended solids, depending on the characteristics of influent wastewater, loading rate and total operation time. The removal efficiencies of the sand columns increased in the order ST (98.16 %) > PO (93.36%) > BF (81.57%) for PO4-P and slightly decreased ST (97.11 %) > PO (92.06%) > BF (76.76%) for Total-P columns. All sand columns loaded with actual wastewater solutions from septic tanks and biofiltration tank have demonstrated high risks of phosphorus leaching (> 99.99%) to the groundwater. The modelling was successful captured behavior of EC tracer and adsorption of PO4-P with acceptable prediction uncertainty in the PO < 8% columns. The modelling results indicated that the decrease of loading rate from 83.3 mL d-1 to 20.83 mL d-1 led to an average increase of removal efficiency and prolong operational lifetime and mass of adsorbed Total-P in the sand soil. This study concludes that sand is a valuable filter medium at low loading rate for phosphorus removal in full-scale operations of onsite treatment systems, however very vulnerable for leaching P when in contact with rainwater.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Adsorption, Constructed wetlands, Leaching, Phosphorus, Sand column
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-314693 (URN)10.1016/j.scitotenv.2022.155254 (DOI)000804051000010 ()35429567 (PubMedID)2-s2.0-85129186836 (Scopus ID)
Note

QC 20220627

Available from: 2022-06-22 Created: 2022-06-22 Last updated: 2022-10-24Bibliographically approved
Hamisi, R., Renman, A., Renman, G., Wörman, A. & Thunvik, R. (2022). Performance of a tidal flow constructed wetland used for post-treatment of on-site wastewater in cold climate. Journal of Water Process Engineering, 47, Article ID 102679.
Open this publication in new window or tab >>Performance of a tidal flow constructed wetland used for post-treatment of on-site wastewater in cold climate
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2022 (English)In: Journal of Water Process Engineering, E-ISSN 2214-7144, Vol. 47, article id 102679Article in journal (Refereed) Published
Abstract [en]

The performance of a tidal flow constructed wetland (TFCW) following wastewater treatment in a package plant designed for two households was studied in a nine-month field trial and its design evaluated through process modelling and pumping tests. The TFCW is operated by filling and draining periods lasting five to nine days, depending on wastewater production by users. The effects of passive aeration, temperature, influent concentration of nutrients and bacteria as well as hydraulic loading on the treatment efficacy of the TFCW system were studied. Results showed that the TFCW system removed ammonium-nitrogen (NH4-N, 76%), phosphate -phosphorus (PO4-P, 56%), total inorganic nitrogen (TIN, 28%) and reduced water pH by15%. The removal efficiency of TIN was significantly improved in the summer (> 50%). The average influent concentration of total phosphorus (TP) was low after the preceding package plant treatment (1.12 mg L-1), but the TFCW showed ability to further reduce TP to the average concentration of 0.57 mg L-1. A coupled reactive transport model was developed in the COMSOL Multiphysics (R) 5.6 software to predict processes of water flow and was validated against the actual data from the field. The modelling exhibited a satisfactory prediction accuracy and capability to capture behavior of effluent PO4-P, NH4-N and dissolved oxygen concentration. Moreover, modelling processes helped to understand the defects of water flow and adsorption processes within the treatment wetland.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Nitrogen, Phosphorus, Porous media, Reactive-transport modelling, Wetland design
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-311892 (URN)10.1016/j.jwpe.2022.102679 (DOI)000781729200004 ()2-s2.0-85125500683 (Scopus ID)
Note

QC 20220506

Available from: 2022-05-06 Created: 2022-05-06 Last updated: 2023-08-25Bibliographically approved
Renman, A. & Renman, G. (2022). Removal of Phosphorus from Hypolimnetic Lake Water by Reactive Filter Material in a Recirculating System—Laboratory Trial. Water, 14(5), Article ID 819.
Open this publication in new window or tab >>Removal of Phosphorus from Hypolimnetic Lake Water by Reactive Filter Material in a Recirculating System—Laboratory Trial
2022 (English)In: Water, E-ISSN 2073-4441, Vol. 14, no 5, article id 819Article in journal (Refereed) Published
Abstract [en]

A toolbox of methods must be available for the remediation of lakes and water bodies suffering from eutrophication. One method suggested is hypolimnetic withdrawal based on a closed-circuit system. Prior to the start of a pilot-scale test at Lake Hönsan, Sweden, a laboratory trial with containers filled with water and bottom sediment from this lake was performed. A peristaltic pump distributed equal bottom water volume to four columns, two filled with glass beads and two with the filter material Polonite, and then back to the surface of the containers. The reactive filter medium (RFM) removed phosphate (PO4-P) efficiently (98.6%), despite the relatively low influent concentration (390 µg L−1). The control column filled with glass beads, removed 2.9% of the PO4-P. The anoxic sediment, containing 2.47 mg P g−1, released PO4-P, which was indicated by the increased concentration in near-bottom water. The redirected water after RFM filtration had high pH (x¯=11.1); however, an equalization took place in the water mass to a lower but still increased pH value  (x¯=8.7) compared to the control  (x¯=7.02). This article reports the pros and cons of a full-scale system using the proposed method.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2022
Keywords
eutrophication, lake remediation, hypolimnion, phosphorus capture
National Category
Oceanography, Hydrology and Water Resources
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-311332 (URN)10.3390/w14050819 (DOI)000773819900001 ()2-s2.0-85126338967 (Scopus ID)
Projects
WIN4LAKE and PROMOTE
Funder
J. Gust. Richert stiftelse, 2020-00651
Note

QC 20220425

Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2023-08-28Bibliographically approved
Rodriguez Gomez, R., Renman, A., Mahmoudzadeh, B. & Renman, G. (2021). Copper and Zinc Removal Efficiency of Two Reactive Filter Media Treating Motorway Runoff-Model for Service Life Estimation. Water, 13(18), Article ID 2592.
Open this publication in new window or tab >>Copper and Zinc Removal Efficiency of Two Reactive Filter Media Treating Motorway Runoff-Model for Service Life Estimation
2021 (English)In: Water, E-ISSN 2073-4441, Vol. 13, no 18, article id 2592Article in journal (Refereed) Published
Abstract [en]

The predominant techniques used for road runoff treatment are sedimentation and filtration. In filtration systems, the ability of the media to adsorb the contaminants is a finite process. Consequently, construction, operation and maintenance managers of such systems should know in advance the service life, i.e., when the used medium should be replaced, and associated costs of operation and maintenance. A batch experiment followed by a packed bed reactor (PBR) experiment addressed the kinetics of the studied media argon oxygen decarburization slag (AOD) and Polonite, followed by the development of a 1D-model to describe the change of concentration of Cu and Zn within time. The batch test results showed that Cu and Zn adsorption followed the Freundlich isotherms for AOD and Polonite. Those results coupled with the linear driving force model and the developed model resulted in good agreement between the PBR results and the simulation. The model was capable to predict (i), the service life at the hydraulic load of 0.18 m/h for AOD (Cu: 395 d; Zn: 479 d) and Polonite (Cu: 445 d; Zn: 910 d), to show (ii) the profile concentration in the PBR within time and the gradient of the concentration along the height of the reactor.

Place, publisher, year, edition, pages
MDPI AG, 2021
Keywords
1D-model, AOD, packed bed reactor, Polonite, stormwater, simulation
National Category
Environmental Sciences Water Engineering
Identifiers
urn:nbn:se:kth:diva-303548 (URN)10.3390/w13182592 (DOI)000701519000001 ()2-s2.0-85115384132 (Scopus ID)
Note

QC 20211018

Available from: 2021-10-18 Created: 2021-10-18 Last updated: 2023-08-28Bibliographically approved
Wikström, J., Bonaglia, S., Ramo, R., Renman, G., Walve, J., Hedberg, J. & Gunnarsson, J. S. (2021). Sediment Remediation with New Composite Sorbent Amendments to Sequester Phosphorus, Organic Contaminants, and Metals. Environmental Science and Technology, 55(17), 11937-11947
Open this publication in new window or tab >>Sediment Remediation with New Composite Sorbent Amendments to Sequester Phosphorus, Organic Contaminants, and Metals
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2021 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 55, no 17, p. 11937-11947Article in journal (Refereed) Published
Abstract [en]

This study tested two sediment amendments with active sorbents: injection of aluminum (Al) into sediments and thin-layer capping with Polonite (calcium-silicate), with and without the addition of activated carbon (AC), for their simultaneous sequestration of sediment phosphorus (P), hydrophobic organic contaminants (HOCs), and metals. Sediment cores were collected from a eutrophic and polluted brackish water bay in Sweden and incubated in the laboratory to measure sediment-to-water contaminant release and effects on biogeochemical processes. We used diffusive gradients in thin-film passive samplers for metals and semi-permeable membrane devices for the HOC polychlorinated biphenyls and polycyclic aromatic hydrocarbons. Al injection into anoxic sediments completely stopped the release of P and reduced the release of cadmium (Cd, -97%) and zinc (Zn, -95%) but increased the sediment fluxes of PAH (+49%), compared to the untreated sediment. Polonite mixed with AC reduced the release of P (-70%), Cd (-67%), and Zn (-89%) but increased methane (CH4) release. Adding AC to the Al or Polonite reduced the release of HOCs by 40% in both treatments. These results not only demonstrate the potential of innovative remediation techniques using composite sorbent amendments but also highlight the need to assess possible ecological side effects on, for example, sedimentary microbial processes.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
Keywords
in situ sorbent amendment, thin-layer capping, eutrophication, metal contamination, HOC contamination, biogeochemical cycles, methanogenesis
National Category
Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-302672 (URN)10.1021/acs.est.1c02308 (DOI)000695530700048 ()34435488 (PubMedID)2-s2.0-85114621207 (Scopus ID)
Note

QC 20210929

Available from: 2021-09-29 Created: 2021-09-29 Last updated: 2022-06-25Bibliographically approved
Renman, A., Hallberg, M., Renman, G., Rodriguez Gomez, R. & Berndtsson, L. (2021). Treatment method to remove dissolved metals from motorway runoff – initial observations and implications for operation and maintenance. In: : . Paper presented at NORDIWA, 28 September - 1 October. Digital conference & exhibition. Göteborg: Svenskt Vatten, FIWA, DANVA, Norsk Vann and Samorka
Open this publication in new window or tab >>Treatment method to remove dissolved metals from motorway runoff – initial observations and implications for operation and maintenance
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2021 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Konferensbidrag till NORDIWA,  28 september – 1 oktober, 2021,  Göteborg

  

Treatment method to remove dissolved metals from motorway runoff – initial observations and implications for operation and maintenance

 

Magnus Hallberg1, Agnieszka Renman2, Raúl Rodríguez Gómez2, Gunno Renman2, Liselott Berndtsson1

 1 Swedish Transport Administration, Stockholm, 2 Royal Institute of Technology, Division of Water and Environmental Engineering, Stockholm

 

A large number of different stormwater treatment systems were designed over the years. Unfortunately, their adaptation to operation and maintenance were not always taken into account.  During the extensive construction of treatment plants at the new motorway bypass Stockholm, the Swedish Transport Administration investigate sustainable and maintenance efficient stormwater solutions for removal of dissolved pollutants. Moreover, the environmental authorities claim for high consent limits of stormwater effluent metal concentrations with particular regard to zinc (Zn). For this reason, the Swedish Transport Administration started a project in 2020. Runoff at three sites along a section of the E4 motorway, Stockholm, are used for testing filter materials in large column experiments and full-scale filter wells to assess removal of dissolved pollutants. The impact of particulate matter for filter clogging is also studied. The filter wells, situated at Lilla Essingen, aim to remove dissolved metals from road runoff. The pre-treated water, where the load of particulate matter reduces in an open storage pond, is pumped into two parallel filter wells, each filled with 2.7 m3 Leca Filtralite® P. The filter system received stormwater from July 2020 and the first part of the trial terminated in December 2020. The volume treated during this period was approximately 1300 m3. We performed automatic flow-proportional and occasional grab sampling of influent and effluent stormwater to the filters.  The water analyses comprised total and dissolved metals, suspended solids (SS), oil, electrical conductivity, turbidity and pH. We continuously monitored the pressure drop in the filters.  The SS and turbidity in the pre-treated, influent water ranged from below 5 up to  170 mg/l and 5.2 to 358 NTU, respectively. The filters removed SS efficiently (78%) and turbidity of effluent water was in average 7.8 NTU. The average removal was for dissolved Zn 94%. The oil index (fraction C10-C40) investigated reached 783 µg/l in the influent but was always below 50 µg/l in the filter effluent. The correlation between turbidity and SS was linear (R2=0.9806). Influent pH was in July and December 7.5 and 7.4 respectively. The filter effluent had a pH of 10.2 in July and 9.5 in December. The filters showed continuous pressure drop during the study period however it did not affect the water flow through the filters.   After six months of operation and up to 26 regulated pond volumes, the filter showed no signs of declining purification function or clogging.

Place, publisher, year, edition, pages
Göteborg: Svenskt Vatten, FIWA, DANVA, Norsk Vann and Samorka, 2021
Keywords
Stormwater, road, metals, filter material, purification
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-299842 (URN)
Conference
NORDIWA, 28 September - 1 October. Digital conference & exhibition
Funder
Swedish Transport Administration, 7125
Note

QC 20220302

Available from: 2021-08-18 Created: 2021-08-18 Last updated: 2024-03-18Bibliographically approved
Renman, A., Engström, F., Strandkvist, I., Karlsson, S. & Renman, G. (2021). Water filtration with mineral-based byproducts as a sustainable treatment technology. Stockholm
Open this publication in new window or tab >>Water filtration with mineral-based byproducts as a sustainable treatment technology
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2021 (English)Report (Other academic)
Abstract [en]

The aim of the project was to investigate whether the 200 000 ton slag, that is not used optimally or deposited every year, can be alternatively applied as water treatment materials, ensuring future outlets and providing added value for the steel industry and society. Five goals had been set and could be met: test of filter material for purification in small sewage plants, testing of mineral filters for industrial wastewater and stormwater, new technology to build road shoulders on busy roads with slag that simultaneously cleans stormwater, laboratory-tested filter products, and two graduated doctors.Slag's properties can be modified in the furnace to contain minerals that have properties to bind phosphorus or metals from water. Slags can separate both cations and anions from contaminated water, anions even at pH value 10. Furthermore, slag and bark in combined filters are able to remove PFAS and also fluorine by modifying of AOD slag. Some types of slag are recommended to replace sand in soil beds for sewage treatment. Stormwater wells in cities and industry can be equipped with slag filters. Storm water from traffic-intensive roads can be cleaned in the road shoulder with certain types of slag.R&D has been conducted in clear collaboration between industry and academia. The research has been conducted in the laboratory, at the companies and in the field. Implementation has been possible through researchers and companies starting pilot facilities and studying their function and utility to achieve sustainability goals. The analysis made is that different types of Swedish-produced slag are useful by-products, after simple reprocessing or after modifications, in water purification applications. These applications can be of several different types and be interesting for several end users.

Abstract [sv]

Målet för projektet var att undersöka om de 200 kton slagg som inte används optimalt eller deponeras varje år kan utnyttjas varaktigt i nya applikationer och därmed säkerställa framtida avsättningsmöjligheter och ger ett mervärde för stålindustrin och samhället. Fem mål fanns och kunde uppfyllas; test av filtermaterial för rening av små avlopp, test av mineraliska filter för industriellt avloppsvatten och dagvatten, ny teknik att bygga stödremsor vid trafikerade vägar med slagg som samtidigt renar dagvatten, laboratorietestade filterprodukter, två doktorer utexaminerade.

Med kunskaper från ett föregående projekt (I-slag) har tillämpade försök hos Ovako i samarbete med Luleå tekniska universitet kunnat påvisa hur slaggers egenskaper kan modifieras i ugnen så att de innehåller mineral som har egenskaper att binda fosfor eller metaller från vattenfaser. I laboratoriemiljö har det bevisats att slagger kan avskilja både katjoner och anjoner från förorenat vatten, anjoner även vid pH-värden över 10. Vidare kan slagg och bark avskilja PFAS och fluor tas bort genom en modifikation av AOD-slagg. Pilotförsök i fält har bevisat att testade slagger har förmåga att reducera fosfor och metaller i olika typer av förorenat vatten. Vid småskalig avloppsrening kan vissa slagger användas som utbytbara filter för fosforrening och fosforåtervinning. De konventionellt byggda markbäddarna med sand för avloppsrening kan med fördel byggas med flera typer av slagg varvid en avsevärt bättre och långsiktig fosforrening erhålls. Dagvatten från industriområden och i städer kan renas effektivare än tidigare med kombinationsfilter, t ex slagg och bark. Större vägar genererar via avrinningen stora mängder föroreningar som i projektets försök visat sig kunna bindas effektivt i vägens stödremsa om lämpliga slagger används istället för grus.Vissa typer av slagger rekommenderas att ersätta sand i markbäddar för avloppsrening. Dagvattenbrunnar i städer och industri kan utrustas med slagg-filter. Dagvatten från trafikintensiva vägar kan renas i stödremsan med vissa typer av slagg.FoU har bedrivits i tydlig samverkan mellan industri och akademi. Forskningen har bedrivits i laboratorium, vid företagen och i fält. Genomförandet har kunnat ske genom att forskare och företag startat pilot-anläggningar och studerat deras funktion och nytta för att uppnå hållbarhetsmål. Den analys som gjorts är att olika typer av svenskproducerad slagg är biprodukter som kan användas efter enkel upparbetning eller efter modifieringar i vattenreningsapplikationer. Dessa tillämpningar kan vara varierande och vara intressanta för flera slutanvändare.

Place, publisher, year, edition, pages
Stockholm: , 2021. p. 33
Series
Jernkontorets forskning, ISSN 0280-249X ; D 884
Keywords
Metallurgical slags, water purification, metals, phosphorus
National Category
Civil Engineering
Research subject
Land and Water Resources Engineering; Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-295563 (URN)
Funder
Vinnova, 2016-02830
Note

QC 20210527

Available from: 2021-05-22 Created: 2021-05-22 Last updated: 2024-03-18Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6617-4001

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