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Journal ArticleDOI

A facile manufacture of highly adsorptive aggregates using steel slag and porous expanded silica for phosphorus removal

TL;DR: In this paper, a porous and sustainable adsorptive aggregate combining both chemical and physical adsorption capacities was developed, and the results showed that the bulk density of the resulting aggregates varies from 570 kg/m3 to 882 kg/ m3, with a bulk crushing strength of up to 5.1 MPa.
Abstract: Natural adsorptive materials are mainly based on physical adsorption and have limited adsorption capacity. Artificial adsorptive aggregates lead to great potential in improving water quality for water treatment. This study aims to develop a porous and sustainable adsorptive aggregate combining both chemical and physical adsorption capacities. Industrial by-product steel slag (SS) powder is used in conjunction with porous expanded silicate (ES) powder applying a non-sintered pelletizing method for producing sustainable high adsorptive aggregates, and bio-based miscanthus (M) is used to further increase its permeability and porosity. The results show that the bulk density of the resulting adsorptive aggregates varies from 570 kg/m3 to 882 kg/m3, with a bulk crushing strength of up to 5.1 MPa. Moreover, all adsorptive aggregates have outstanding resistance to salt and freeze-thaw cycles. Phosphorus (P) adsorption tests show that the adsorptive aggregates remove the P in aqueous solution (168 mg/L), with an adsorption capacity of 4.2 mg/g. The research demonstrates that sustainable high adsorptive aggregates with good mechanical properties can be produced applying the facile pelletizing method, suitable for the application in the field of water treatment such as adsorptive concrete, constructed wetlands and rainwater gardens. Keywords Adsorptive aggregatePelletizingSteel slagExpanded silicaMiscanthusWater treatment
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Journal ArticleDOI
TL;DR: In this article , the potential of steel slag as an adsorbent for removing pollutants in water was reviewed, and the results demonstrated that steel slags can be used for removing inorganic nonmetallic ions (e.g., phosphate, nitrogen, etc.), heavy metal ions, organic dyes and other pollutants from wastewater.
Abstract: Steel slag refers to solid waste with high specific surface area and large porosity that is discharged from the crude steel smelting process in steel mills. The concentration of heavy metal ions leached from the steel slag fulfils many industry criteria and is extremely safe, suggesting that it may be employed as a new form of low-cost adsorbent for removing pollutants from water. This paper reviews the potential of steel slag as an adsorbent for removing pollutants in water; the results demonstrate that steel slag can be used for removing inorganic non-metallic ions (e.g., phosphate, nitrogen, etc.), heavy metal ions, organic dyes and other pollutants from wastewater. In addition, the effect of modified steel slag and reconstituted steel slag in removing pollutants were explored to address problems such as limited adsorption efficiency owing to the limitations of steel slag characteristics. To better clarify the relationship between the use of steel slag in removing pollutants from water, the removal mechanism and influencing factors were analyzed; the results demonstrated that factors such as solution pH, temperature, and steel slag characteristics affect the pollutant removal efficiency. Analyzed from the perspective of economic benefits, environmental benefits, and safety applications, the use of steel slag for removing pollutants in water not only utilizes solid waste resources safely but also treats wastewater, thereby indicating future large-scale applications of steel slag in water treatment engineering.

18 citations

Journal ArticleDOI
TL;DR: In this paper , the authors investigated the possibility of using CO2-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP).
Abstract: This study investigated the possibility of using CO2-active basic oxygen furnace slag (BOFS) as binder for the production of AAs with low-value waste concrete powder (WCP). The effects of curing methods (CO2 and natural air curing) and BOFS dosages on the AAs properties were analyzed. The results showed that BOFS could be successfully used as binder to produce WCP granulated AAs, with attained loose bulk density, crushing strength and water absorption of 1220 kg/m3, 3.6 MPa and 8.6%, respectively. Increasing the BOFS dosage enhanced the crushing strength and decreased the water absorption of AAs. CO2 curing resulted in C-S-H and CaCO3 formation, which contributed to further improving the crushing strength by 30%-109% and decreasing the water absorption by 12–22%. From an environmental perspective, the produced BOFS-WCP granulated AAs activated with CO2 were able to reduce global warming potential by 25% compared with conventional AAs containing 20 wt.% cement as binder.

9 citations

Journal ArticleDOI
TL;DR: In this paper , a rare earth-free superior phosphate adsorbent was prepared from natural Ca-rich clay, which showed high adsorption capacity of 372.57 mg/g and removal rate of 99.9%.

8 citations

Journal ArticleDOI
TL;DR: In this article , the preparation of lightweight aggregates (LWAs) using sewage sludge ash (SSA) by cold bonding technology can reduce the negative impact of SSA on the environment, it is an efficient solution to dispose of sSA.

5 citations

Journal ArticleDOI
TL;DR: In this article , a response surface method was used to enhance the phosphate removal effectiveness of a Mg-doped UiO-66-NH2 nanocomposite synthesized via the solvothermal process.

4 citations

References
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Journal ArticleDOI
TL;DR: An overview of biochar production technologies, biochar properties, and recent advances in the removal of heavy metals, organic pollutants and other inorganic pollutants using biochar is provided.

1,301 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed the production, processing, and characteristics of steel slag, and its use as a cementing component in different cementing systems, and showed that steel slags with high basicity and being cooled properly can exhibit cementing property.
Abstract: Steel slag is a byproduct from either the conversion of iron to steel in a basic oxygen furnace, or the melting of scrap to make steel in an electric arc furnace. This paper reviews the production, processing, and characteristics of steel slag, and its use as a cementing component in different cementing systems. The chemical composition and cooling of molten steel slag have a great effect on the physical and chemical properties of solidified steel slag. Steel slag with high basicity and being cooled properly can exhibit cementing property. Ground steel slag has been used in several different cementing systems. The use of steel slag in these cementing systems results in some advantages over conventional cements. At the moment, most steel slag is being used as unbound aggregate for ashphalt concrete pavement in many countries. However, the use of steel slag as a cementing component should be given a priority from technical, economical, and environmental considerations.

503 citations

Journal ArticleDOI
TL;DR: This review provides a critical review of current research updates related to the pollutants interaction with surface functional groups of biochars and the effect of the parameters variability on biochar attributes pertinent to specific pollutants removal, involved mechanisms, and competence for these removals.

497 citations

Journal ArticleDOI
TL;DR: More sorption data using biochar especially at demonstration-scale, for treating potable and reuse water in adsorption/filtration applications will help establish the potential of biochars to serve as surrogates for activated carbons.

431 citations

Journal ArticleDOI
TL;DR: Adsorption processes are being widely used by various researchers for the removal of heavy metals from waste streams and activated carbon has been frequently used as an adsorbent as discussed by the authors.

410 citations