A fundamental research on phosphate removal by using slag

Yamada, Hisashi; Kayama, Mitsu; Saito, Kazuo; Hara, Masakazu

doi:10.1016/0043-1354(86)90018-7

Cited by 132 publications

(56 citation statements)

References 8 publications

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“…Adsorption of P by a converter slag is largest at pH 8, while dissolution of P is largest at pH 6 and exponentially decreased with increasing pH. 18) In other experiment, P is released from a converter slag to seawater at pH 7-8, whereas removed from seawater at pH 9 due to precipitation of calcium phosphate. 19) It is commonly observed in above experiments that concentration of P in water increases under acidic or neutral condition and decreases under alkaline condition.…”

Section: Effect Of Slags On P and Si In Seawatermentioning

confidence: 99%

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

2003

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Culture experiments of a natural phytoplankton assemblage collected from coastal surface water and a mono-specifically cultured diatom were conducted to investigate the possibility of steelmaking slags to use as a nutrient resource for marine phytoplankton. Two kinds of slags, a decarburization slag and a dephosphorous slag, were tested in batch cultures under freely drifting pH. Leaching experiment to determine dissolution of nutrient elements from the slags demonstrated that phosphate and reactive silicate are released into seawater, while rate of their dissolutions does not simply depend on amount of the slags. Excess addition of the slags (3 300 mg/l ) decreased phosphate in the seawater probably due to precipitation with calcium of main component of the slags. Growth of natural phytoplankton assemblage was evidently enhanced by addition of the slags at 33 mg/l. However, excess addition (3 300 mg/l ) suppressed the growth of phytoplankton due to not only decreased phosphate and silicate but also increased pH to 10. This shift to alkaline might decrease considerably solubility of iron (essential nutrient for phytoplankton growth), although organic ligands existed. These results indicate that slag enrichment would be effective at a lower dose to avoid pH increase. Although in our study 33 mg/l was confirmed to be the best dose, solubility of the elements and pH increase might be different with different slags. Therefore, the best dose should be determined for each slag before application.

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Section: Effect Of Slags On P and Si In Seawatermentioning

confidence: 99%

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

2003

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“…Some materials have been evaluated in field trials either in constructed wetlands (CW) or in tertiary units following CW; the results from these studies vary, but few substrates appear to be particularly good for P removal with regard to sorption capacity and hydraulics (e.g., wollastonite, slags and, to some extent, light-weight aggregate products [8]). Slag materials are a non-metallic by-product of iron and steel production which floats on the molten metal after raw materials are loaded into and melted in the furnace; blast furnace slag (BFS) is produced by rapid cooling of molten slag [2].…”

Section: Introductionmentioning

confidence: 99%

“…Reactive sorbent materials have been evaluated for P removal from wastewaters over the past two decades, including early studies with slags [2], sand [3], aluminium and iron oxides [4], limestone [5], shale rocks [6], and wollastonite [7]. Many of these materials have been tested in batch experiments in order to determine sorption equilibrium isotherms, followed by column experiments fed with P-spiked water or wastewater.…”

Section: Introductionmentioning

confidence: 99%

Enhanced phosphorus removal in a waste stabilization pond system with blast furnace slag filters

Camargo‐Valero

Johnson

Mather

et al. 2009

Desalination and Water Treatment

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A B S T R A C TIn this work a tertiary horizontal-flow blast furnace slag (BFS) filter was tested for phosphorus removal under laboratory and field conditions. Laboratory experiments were conducted in a benchscale BFS filter for phosphorus adsorption capacity at equilibrium conditions using P-spiked water. On-site, the performance of a pilot-scale BFS filter was monitored for phosphorus removal from the final effluent of a pilot-scale WSP system located in Esholt (Bradford, UK), which comprises a primary facultative pond and a secondary aerated rock filter (ARF) in series. Adsorption capacity (q) results showed that BFS has high affinity for inorganic P species and it can remove up to 30 g P/ kg BFS; however, q values are strongly dependent on the initial P concentration. The pilot-scale BFS filter tested on-site performed better for longer (<2 mg P/L) than the laboratory-scale filter, even though despite the latter received the same hydraulic and P loadings (1.8 m 3 /m 3 d and 18 g P/ m 3 d, respectively). Both the laboratory and field results showed that BFS filters are an appropriate low-cost technology to upgrading small wastewater treatment systems for phosphorus removal.

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“…They further observed that removal of basic dyes is 6-10 times higher than that of acid dyes. Yamada et al [117] studied phosphate liberation from sediment by adsorption. They reported that soft granulated slag adsorbs phosphate more than hard granulated slag and explain edit on the basis of porosity of the adsorbent.…”

Section: Bio-waste Materials As Adsorbent Of Contaminate From Waste Wmentioning

confidence: 99%

Applications of Bio-waste Materials as Green Synthesis of Nanoparticles and Water Purification

Ali¹

2017

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Towards the future of green, sustainable and renewable products the suggestion of using the agriculture biomass in the coming decades got increased. Biomass material is one of the important sources of alternative material for the production of biocomposite products. An increasing global awareness about environmental issues is acting as the driving force behind the utilization of biomass material as valuable products. Bio-waste materials (agricultural waste) have been recognized as an ecological burden for the society they stimulated new gateways for the production of renewable, low cost and sustainable adsorbents for water treatment applications. In the area of water purification, nanotechnology offers the possibility of an efficient removal of pollutants and bacteria. Adsorption has proved that it is the best process of water treatment technologies, because of its significant advantages. Different modification methods of waste-based adsorbents, have also been presented to highlight and discuss the key advancements on the preparation of novel adsorbents using agricultural "agro-waste". Adsorption mechanisms responsible for pollutants removal by waste-based adsorbents have also been discussed. It also focuses on the computational aspects of binding of biomolecules to nanoparticles (NPs) and some of the applications of the biosynthesized NPs as water purification. The nature acts like a large ''bio-laboratory" comprising of plants, algae, fungi, yeast, etc. which are composed of biomolecules. These naturally occurring biomolecules have been identified to play an active role in the formation of nanoparticles with distinct shapes and sizes thereby acting as a driving force for the designing of greener, safe and environmentally benign protocols for the synthesis of NPs. The biosynthesis of NPs using waste materials will help researchers not only to design safer nanomaterials but also to promote the understanding of health and safety considerations of NPs. Useful materials can be produced easily even at reasonable scale because the biomaterial based routes eliminate the need to use toxic chemicals. The aim of this review is to summarize the adsorption capacities for organic and inorganic pollutants by different bio-waste-based adsorbents.

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A fundamental research on phosphate removal by using slag

Cited by 132 publications

References 8 publications

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

Enhanced phosphorus removal in a waste stabilization pond system with blast furnace slag filters

Applications of Bio-waste Materials as Green Synthesis of Nanoparticles and Water Purification

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