Basic Oxygen Furnace steel slag aggregates for phosphorus treatment. Evaluation of its potential use as a substrate in constructed wetlands

Blanco, Iván; Molle, Pascal; Miera, Luis E. Sáenz de; Ansola, Gemma

doi:10.1016/j.watres.2015.11.064

Cited by 131 publications

(37 citation statements)

References 45 publications

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“…The utilization of low-cost and easily available materials as the filter media has been widely demonstrated by previous studies for their reliability and contribution in the removal of phosphate including fly ash [4], limestone [5], iron oxide tailings [6], blast furnace slag [7], basic oxygen furnace slag and electric arc furnace slag [8].…”

Section: Introductionmentioning

confidence: 99%

Comparisons Study of Phosphate Removal in Unaerated and Aerated High Calcium Steel Slag Filter System of Different pH Feed

et al. 2017

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Abstract.Excess phosphorus in water body will lead to eutrophication. This study investigated the phosphate removal efficiencies of unaerated and aerated filter systems using high composition of Calcium (Ca) steel slag as the filter media at different pH values of the wastewater influents. Lab-scale filters were developed using 25 mg/L synthetic wastewater and weekly sampling was done to monitor the phosphate removal efficiencies together with the concentration of metals (Calcium (Ca) and Magnesium (Mg). The results show that both unaerated and aerated systems have excellent phosphate removal efficiency at all acidic, neutral and alkaline pH feed, though unaerated systems removed slightly better compared to aerated systems; 76-98% and 69-97% respectively. The dominant phosphate removal mechanism for aerated systems was adsorption, meanwhilefor unaerated systems; both adsorption and precipitation for acidic and neutral pH, whileprecipitation was more dominant at basic pH. The performance of unaerated systems are slightly better compared to aerated systems, however, aerated systems are recommended to be applied when simultaneous removal of nutrients (phosphorus and nitrogen) are concerned.

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Section: Introductionmentioning

confidence: 99%

Comparisons Study of Phosphate Removal in Unaerated and Aerated High Calcium Steel Slag Filter System of Different pH Feed

et al. 2017

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“…The constructed wetland with hollow brick crumbs mixed with fly ash can cut down 89% of NH4+-N and 81% of TP [28,76]. Slag was effective for the treatment of wastewater in constructed wetlands, and the removal rate of P was maintained at a high level [57,77,78]. Slag was 20% higher than gravel in respect of adsorption capacity of TP and the experiments witnessed a quick absorption saturation of TP by slag.…”

Section: Calcitementioning

confidence: 96%

The Use of Constructed Wetland for Mitigating Nitrogen and Phosphorus from Agricultural Runoff: A Review

Zheng

Xiao

et al. 2021

Water

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The loss of nitrogen and phosphate fertilizers in agricultural runoff is a global environmental problem, attracting worldwide attention. In the last decades, the constructed wetland has been increasingly used for mitigating the loss of nitrogen and phosphate from agricultural runoff, while the substrate, plants, and wetland structure design remain far from clearly understood. In this paper, the optimum substrates and plant species were identified by reviewing their treatment capacity from the related studies. Specifically, the top three suitable substrates are gravel, zeolite, and slag. In terms of the plant species, emergent plants are the most widely used in the constructed wetlands. Eleocharis dulcis, Typha orientalis, and Scirpus validus are the top three optimum emergent plant species. Submerged plants (Hydrilla verticillata, Ceratophyllum demersum, and Vallisneria natans), free-floating plants (Eichhornia crassipes and Lemna minor), and floating-leaved plants (Nymphaea tetragona and Trapa bispinosa) are also promoted. Moreover, the site selection methods for constructed wetland were put forward. Because the existing research results have not reached an agreement on the controversial issue, more studies are still needed to draw a clear conclusion of effective structure design of constructed wetlands. This review has provided some recommendations for substrate, plant species, and site selections for the constructed wetlands to reduce nutrients from agricultural runoff.

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“…It was observed that the EAF slag filter only removed 37% of the total phosphorus whereas the BOS slag filter removed 62%. Calcium slag dissolution and calcium phosphate precipitation were the two mechanisms of phosphorus removal observed (Bowden et al, 2009;Blanco et al, 2015). The pH of the filtered wastewater was elevated during the first 5 weeks of the experiment and then stabilized to below pH 9.…”

Section: Phosphorus Removal From Wastewatermentioning

confidence: 98%

The recycling and reuse of steelmaking slags — A review

Fisher

Barron

2019

Resources, Conservation and Recycling

186

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Basic Oxygen Furnace steel slag aggregates for phosphorus treatment. Evaluation of its potential use as a substrate in constructed wetlands

Cited by 131 publications

References 45 publications

Comparisons Study of Phosphate Removal in Unaerated and Aerated High Calcium Steel Slag Filter System of Different pH Feed

Comparisons Study of Phosphate Removal in Unaerated and Aerated High Calcium Steel Slag Filter System of Different pH Feed

The Use of Constructed Wetland for Mitigating Nitrogen and Phosphorus from Agricultural Runoff: A Review

The recycling and reuse of steelmaking slags — A review

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