The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review

Westholm, Lena Johansson

doi:10.3390/w2040826

Cited by 29 publications

(4 citation statements)

References 23 publications

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“…Sorption values following initial concentration of 600 mg P L −1 averaged 6.8, 5.1, 3.8, 3.4, 1.2, and 0.5 g P kg −1 for FS Fine , FS SM , FS LG , ES, EC, and SL, respectively. The sorption results for FS were similar to previous findings (Johansson, 1999b Xu et al, 2006; Johansson Westholm, 2010; Penn et al, 2011; Yu et al, 2015). The increased sorption of FS compared with other PSM is likely the result of the higher Ca content (which is more than ten times that of other treatments) and a greater pH.…”

Section: Resultssupporting

confidence: 90%

Evaluation of Phosphorus Filter Media for an Inline Subsurface Drainage Treatment System

Sanford

Larson

2016

J of Env Quality

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Subsurface drainage from agricultural land has been identified as a contributor of both N and P into surface waters, leading to water quality degradation and eutrophication. This study evaluates the ability of P sorption media (PSM; expanded shale, expanded clay, furnace slag, and natural soil) to sorb P in both batch and column tests. Batch sorption tests estimated sorption of 3.4, 1.2, and 0.5 g P kg for expanded shale, expanded clay, and natural soil, respectively. Furnace slag sorption was evaluated for fine (FS), small (FS), and large (FS) particle sizes, with estimated sorption of 6.8, 5.1, and 3.8 g P kg, respectively. Phosphorus removal for the three furnace slag particle sizes and natural soil were tested in flow-through columns operated at residence times of 50, 17, and 7 s. A decrease in residence time reduced P removal in all columns evaluated. Following all trials, the average P removal from influent was 50% for FS, followed by 27% for FS (furnace slag-coated pea gravel), 22% for FS, and 6% for sandy loam-coated pea gravel. The data from this study provides crucial information for developing and sizing an inline tile drainage treatment system to remove P from tile drainage outlets before reaching surface waters.

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Section: Resultssupporting

confidence: 90%

Evaluation of Phosphorus Filter Media for an Inline Subsurface Drainage Treatment System

Sanford

Larson

2016

J of Env Quality

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“…The chemical composition of the AOD and EAF slags is given in Table 1 . The chemical composition of BFS was determined in an earlier study (Johansson Westholm 2010 ).…”

Section: Methodsmentioning

confidence: 99%

Dual slag filters for enhanced phosphorus removal from domestic waste water: performance and mechanisms

Zuo

Renman

Gustafsson

et al. 2017

Environ Sci Pollut Res

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The phosphorus (P) removal of five combinations of dual filters consisting of blast furnace slag (BFS), argon oxygen decarburisation slag (AOD) and electric arc furnace slag (EAF) was evaluated in column experiments with domestic waste water. The columns were fed with waste water for 24 days. The column with only EAF had the best P removal performance (above 93% throughout the experiment). The speciation of the bound P was evaluated by P K-edge X-ray absorption near-edge structure (XANES) spectroscopy. In all five columns, the main P species of the slag packed in the outlet chamber was amorphous calcium phosphate (ACP). In samples from the inlet chambers, the contributions from crystalline Ca phosphates, P adsorbed on gibbsite and P adsorbed on ferrihydrite were usually much greater, suggesting a shift of P removal mechanism as the waste water travelled from the inlet to the outlet. The results provide strong evidence that P was predominantly removed by the slags through the formation of ACP. However, as the pH decreased with time due to the progressively lower dissolution of alkaline silicate minerals from the slag, the ACP was rendered unstable and hence redissolved, changing the P speciation. It is suggested that this process strongly affected the lifespan of the slag filters. Of the slags examined, EAF slag had the best P removal characteristics and BFS the worst, which probably reflected different dissolution rates of alkaline silicates in the slags.Electronic supplementary materialThe online version of this article (10.1007/s11356-017-0925-y) contains supplementary material, which is available to authorized users.

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“…For international comparison, the data on the slag compositions for 25 steelworks representing 16 countries have been collected in literature [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] and shown in Figure 8. All compositions have been adjusted to equal content of MnO (0.3%) and FeO (0.4%) and recalculated to 100% of CaO + SiO 2 + MgO + Al 2 O 3 + FeO + MnO.…”

Section: On the Optimal Slag Compositionmentioning

confidence: 99%

Slag parameters and sulphur partition in blast furnace hearth: Ukrainian case and international comparison

Shatokha

2021

Ironmaking & Steelmaking

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Blast furnace ironmaking usually requires maintaining a reasonable level of hot metal desulphurization; therefore, knowledge of the complex interplay between physical properties and desulphurization potential of slag is essential for the holistic approach to the operation. Several models for predicting sulphur partition between slag and hot metal based on sulphide capacity estimation have been studied in application to the Ukrainian blast furnace. Influence of an optical basicity, as well as of CaO/SiO 2 and MgO/Al 2 O 3 ratios on sulphur partition between slag and hot metal, was analysed. Attainment of the equilibrium partition was estimated in connection with Si content in hot metal. International comparison of blast furnace slags was conducted involving data for 25 steelworks from 16 countries covering composition, physical properties and desulphurization potential. Approaches to optimization of slag composition are discussed, considering the tradeoff between enhancing slag's desulphurization capacity and keeping its physical properties favourable to smooth and productive operation.

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The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review

Cited by 29 publications

References 23 publications

Evaluation of Phosphorus Filter Media for an Inline Subsurface Drainage Treatment System

Evaluation of Phosphorus Filter Media for an Inline Subsurface Drainage Treatment System

Dual slag filters for enhanced phosphorus removal from domestic waste water: performance and mechanisms

Slag parameters and sulphur partition in blast furnace hearth: Ukrainian case and international comparison

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