Synthesis and evaluation of basic oxygen furnace slag based geopolymers for removal of metals and sulphates from acidic industrial effluent-column study

Sithole, Thandiwe; Ntuli, Freeman; Okonta, Felix

doi:10.1016/j.jwpe.2020.101518

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…The main components of the water are analyzed in Table 1. The precipitation method was used to investigate the effect of different pH (7,8,9,10,11,12), reaction temperature (15,25,35,45, 55 • C), reaction time (10, 20, 30, 40, 50, 60, 90 min), stirring speed (200, 300, 400, 500, 600, 700 rpm) and precipitant concentration (0.1, 0.2, 0.3, 0.4, 0.5 g/L NaOH and 10, 20, 30, 40, 50 g/L BaCl 2 ) on the removal of heavy metals (Cd, Mn, Cu) and sulfate from mine water. We took a number of 200 mL conical flasks, and added 100 mL of simulated mine water, Cd 2+ , Cu 2+ , Mn 2+ 10 mg/L and SO 4 2− at a concentration of 10 g/L to each.…”

Section: Test Reagents and Materialsmentioning

confidence: 99%

“…Precipitation is widely used in mine water treatment because of its cost-effectiveness, simple operation and rapid response [11]. Emma [12,13] removed >99% of aluminum, arsenic, cadmium, cobalt, copper, iron and manganese from AMD wastewater discharged in a copper-zinc mine using coke lime byproducts generated in the production of quick lime; the same amount of sludge was produced, and approximately 50-60% of the same amount of sulfate could be removed under the treatment of quick lime and hydrated lime. Chemical precipitation has a high removal efficiency for heavy metals in mine water, but due to the complex characteristics of mine water, it is not easy to deal with inorganic salts via conventional chemical precipitation, and heavy metals cannot be completely precipitated [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Combination of Precipitation-Adsorption-Bipolar Membrane Electrodialysis for Mine Water Treatment

Feng,

Cen,

2024

Water

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The process of mining produces a large amount of heavy metals and high-sulfate mine water, which is the main factor leading to environmental degradation in the mining area, and the removal of heavy metals and the recovery of sulfate from mine water is a difficult problem faced by mines today. Currently, sulfate is treated as a hazardous substance and is not recycled. In this paper, the precipitation–adsorption bipolar membrane electrodialysis (BMED) multi-technology-coupled recovery of sulfate method was used to treat mine water. The results showed that the coupling technology could remove heavy metals and sulfate in water better, while the sulfate desalination rate was about 96.8%, current efficiency was 54.2%, energy consumption was 0.823 kWh/kg, and the acid production concentration was 0.168 at an electrolyte concentration of 0.1 mol/L, an operating voltage of 12 V, an initial salt concentration of 30 g/L, and a flow rate of 3.5 mL/min. Mechanistic results showed that the precipitation–adsorption method could realize the removal of heavy metals from mine water. The BMED process realized the removal of sulfate and also the recovery of acid. The multi-technology coupling of precipitation–adsorption and bipolar membrane electrodialysis explored in this paper provides a direction for the in-depth treatment of mine water.

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Section: Test Reagents and Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combination of Precipitation-Adsorption-Bipolar Membrane Electrodialysis for Mine Water Treatment

Feng,

Cen,

2024

Water

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“…Sarkar et al adopted BOFS as a raw material for obtaining of GPs and investigated Ni 2+ [39], Zn 2+ [40], and F À [41] removal. BOFS was used by Sithole et al as a precursor for AAM preparation [42,43]. In order to achieve highly porous structures for percolation column tests, a foaming agent (hydrogen peroxide) was added.…”

Section: Raw Materials and Preparation Of Gp/aam Materials For Water mentioning

confidence: 99%

“…Direct foaming, either chemically or mechanically, is seen as the most widely applied foaming approach. The common additives that have been used in the direct foaming methods are hydrogen peroxide [11,33,43,54,78,93], Al [131,154] or Si [155] powders along aside with stabilization agents such surfactants or oils.…”

Section: Forms and Manufacturing Techniques Of Gps/aams For Water Trementioning

confidence: 99%

“…In the showcase, the adsorption capacity of GPs towards Cu 2+ decreased by 27% as compared to synthetic samples. Sithole et al treated acidic industrial effluents by FA/BOFS-based GPs [42,43]. New GPs containing hollow gangue microsphere were applied for Zn 2+ removal from smelting plant wastewater in [93].…”

Section: Properties and Performance Of Gps/aams Towards Various Contamentioning

confidence: 99%

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Geopolymers and Alkali-Activated Materials for Wastewater Treatment Applications and Valorization of Industrial Side Streams

Samarina¹,

Takaluoma²,

Laatikainen³

2021

Advances in Geopolymer-Zeolite Composites - Synthesis and Characterization

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The EU has the ambitious goal to transition from linear to circular economy. In circular economy, the old saying of “one’s waste is the other’s treasure” is being implemented. In this chapter, valorisation of industrial side streams, traditionally branded as waste, is discussed with respect to their applications as raw materials for new adsorptive products – geopolymers (GP) and alkali-activated materials (AAM) – as adsorbents in wastewater treatment. The chemical nature and structure of materials generally have great influence on GP/AAM adsorption capability. The approaches used for the raw materials preparation (chemical or physical) prior geopolymerization to increase the adsorption capacity of the final products will be discussed. Adsorption properties and performance of GPs/AAMs towards various contaminants are described, and the latest research on testing those materials as water remediation are reviewed. Special attention is paid to regeneration of exhausted materials and available resource recovery options that the regeneration approach opens. New forms of geopolymer adsorbent such as foams or core-shell structures are described and in the last part of the chapter, a short economic evaluation of resource recovery models is provided.

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In-Situ Remedies

Chidiac,

Bleasdale-Pollowy,

Holmes

et al. 2023

SpringerBriefs in Applied Sciences and Technology

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Synthesis and evaluation of basic oxygen furnace slag based geopolymers for removal of metals and sulphates from acidic industrial effluent-column study

Cited by 11 publications

References 17 publications

Combination of Precipitation-Adsorption-Bipolar Membrane Electrodialysis for Mine Water Treatment

Combination of Precipitation-Adsorption-Bipolar Membrane Electrodialysis for Mine Water Treatment

Geopolymers and Alkali-Activated Materials for Wastewater Treatment Applications and Valorization of Industrial Side Streams

In-Situ Remedies

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