Reagent decontamination of liquid chrome-containing industrial wastes

Tsybulskaya, Oksana Nikolaevna; Ксеник, Т.В.; Yudakov, A. A.; Slesarenko, V. V.

doi:10.1016/j.eti.2018.10.003

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…The required number of fluxes is determined by the melting diagram of the SiO 2 -MgO-Al 2 O 3 ternary system (Figure 5). Optimal areas of phase compositions of slag are marked by dots on the diagram, hence, the composition of slag in the smelting of high-carbon ferrochrome conversion is as follows, %: SiO 2 27-33 (34)(35)(36); ; Al 2 O 3 26-30 (20-26); Cr 2 O 3 < 8 (3)(4)(5)(6).…”

Section: Resultsmentioning

confidence: 99%

“…Mining wastes (overburden dumps, mill tailings, smelter slags and sludge and ash from thermal power plants) are often of high industrial value. Production from mining waste is two-four times cheaper than from a natural deposit, and the payback on capital investment usually does not exceed 1-2 years [3]. Technogenic wastes have passed all stages of extraction and beneficiation and are stored in tailings ponds so that they do not incur additional costs for extraction, operation of an open pit or mine and ore preparation (crushing and grinding), which is the economic feasibility of processing this raw material.…”

Section: Introductionmentioning

confidence: 99%

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Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Ultarakova,

Tastanov,

Sadykov

et al. 2023

J. Compos. Sci.

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This study presents the results of the enlarged laboratory research on the melting of calcined composite pellets for ferrochrome obtained from fine-dispersed conditioned chrome concentrate containing 50.3% Cr2O3. This is a product of the gravitational beneficiation of waste sludge tailings from the Dubersay tailings dump at the Donskoy Mining and Processing Plant (DMPP) of JSC “TNC Kazchrome”. The composition of the charge for obtaining composite pellets consisted of 88.5% of chrome concentrate, 3% of mineral part of refined ferrochrome slag (RFC), 4% of ferruginous diatomite, 3% of coke and 1.5% of liquid glass. The initial charge was pelletized on a laboratory pelletizer to a size of 6–10 mm, dried at room temperature for 24 h and fired at 1200 °C for 60 min at a heating rate of 15 deg/min. On the basis of the developed composite annealed pellets, studies on the production of high-carbon ferrochrome at different melting temperatures were carried out. The results showed that with an increase in temperature from 1750 to 1850 °C, the iron–chromium phase in the composition of the alloy increases from 45.2 to 50.1%, the chromium carbide phase decreases from 23.7 to 11.3% and the chromium–iron phase increases from 7 to 11.2%. The carbon content in the alloys at temperatures from 1750 to 1850 °C varies from 7.2 to 8.94%, respectively. The maximum chromium content of the alloy is 64.82% with a melting point of 1850 °C; this alloy can be classified as FeCr60C90LP grade ferrochrome according to the international Chinese standard, which has no more than 0.03% phosphorus and no more than 0.1% sulfur.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Ultarakova,

Tastanov,

Sadykov

et al. 2023

J. Compos. Sci.

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“…Other methods include the application of principles of electrokinetics 19 , electrocoagulation 20 , electrochemical reduction 21 , electrodialysis 20 , and electrodeionization 22 . Cr(VI) in wastewater can also be removed by treating the water with chemicals like H 2 S 23 , sodium dithionite 24 , sodium metabisulfite 25 sodium dichloroisocyanate and sodium hypochlorite 26 , calcium metabisulfite 27 , ferrous sulphate 28 . Biotransformation 29 , biosorption 30 , biomineralization 31 , and extracellular precipitation 32 are a few techniques which utilizes biological organisms (plants or microbial biomass) as remedial agent for heavy metal contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles

Garg,

Singh,

Khan

et al. 2024

Sci Rep

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This work describes the study of the removal of a refractory contaminant, i.e., Hexavalent chromium (Cr(VI)) from aqueous systems by a novel adsorbent comprising Cr(VI) tolerant bacteria and zero valent iron nanoparticle (nZVI). A gram-positive, rod-shaped bacteria used in the study were isolated from wastewater (WW) received from the effluent of leather industries. The adsorbents were prepared with bacteria, nZVI alone, and a combination of both. The adsorbent comprising both elements was found to remove Cr(VI) with a higher percentage (93%) and higher capacities (0.58 mg/g) as compared to adsorbent with bacteria (Cr(VI) removal = 63%, qe = 0.163 mg/g) or nanoparticles (Cr(VI) removal = 80%, qe = 0.45 mg/g) alone. The adsorbent worked best at neutral pH, and the removal became saturated after 90 min of incubation. Equilibrium studies with isotherm modeling suggested that the adsorption process follows sips isotherm (R2 = 0.9955), which is expected to bean intra-particle diffusion process before the actual adsorption. Process kinetics was modeled with pseudo-first order, pseudo-second order, and Vermeulen model. The diffusion coefficient determined by fitting the kinetic data to Vermeulen model was found to be 0.0000314 cm2/s. The adsorbent can be tested further for continuous flow processes to find more insights about the usage on a large scale.

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“…Among the heavy metals, chromium is one of the most common ones, which is found in wastewater from industries such as steel manufacturing, electroplating, leather tanning, pulp production, landfills, etc. (Truskewycz et al, 2018;Tsybulskaya et al, 2019). Hexavalent chromium easily enters the cytoplasmic matrix through the cell membrane of denitrifying bacteria, which changes the conformation of enzymes and blocks the necessary functional groups of microorganisms, leading to a decrease in the denitrification capacity of bacteria (Colussi et al, 2009;Konovalova et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of simultaneous hexavalent chromium biosorption and nitrogen removal by the aerobic denitrifying bacterium Pseudomonas stutzeri YC-34 from chromium-rich wastewater

Yang

Zhang

et al. 2022

Front. Microbiol.

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The impact of high concentrations of heavy metals and the loss of functional microorganisms usually affect the nitrogen removal process in wastewater treatment systems. In the study, a unique auto-aggregating aerobic denitrifier (Pseudomonas stutzeri strain YC-34) was isolated with potential applications for Cr(VI) biosorption and reduction. The nitrogen removal efficiency and denitrification pathway of the strain were determined by measuring the concentration changes of inorganic nitrogen during the culture of the strain and amplifying key denitrification functional genes. The changes in auto-aggregation index, hydrophobicity index, and extracellular polymeric substances (EPS) characteristic index were used to evaluate the auto-aggregation capacity of the strain. Further studies on the biosorption ability and mechanism of cadmium in the process of denitrification were carried out. The changes in tolerance and adsorption index of cadmium were measured and the micro-characteristic changes on the cell surface were analyzed. The strain exhibited excellent denitrification ability, achieving 90.58% nitrogen removal efficiency with 54 mg/L nitrate-nitrogen as the initial nitrogen source and no accumulation of ammonia and nitrite-nitrogen. Thirty percentage of the initial nitrate-nitrogen was converted to N2, and only a small amount of N2O was produced. The successful amplification of the denitrification functional genes, norS, norB, norR, and nosZ, further suggested a complete denitrification pathway from nitrate to nitrogen. Furthermore, the strain showed efficient aggregation capacity, with the auto-aggregation and hydrophobicity indices reaching 78.4 and 75.5%, respectively. A large amount of protein-containing EPS was produced. In addition, the strain effectively removed 48.75, 46.67, 44.53, and 39.84% of Cr(VI) with the initial concentrations of 3, 5, 7, and 10 mg/L, respectively, from the nitrogen-containing synthetic wastewater. It also could reduce Cr(VI) to the less toxic Cr(III). FTIR measurements and characteristic peak deconvolution analysis demonstrated that the strain had a robust hydrogen-bonded structure with strong intermolecular forces under the stress of high Cr(VI) concentrations. The current results confirm that the novel denitrifier can simultaneously remove nitrogen and chromium and has potential applications in advanced wastewater treatment for the removal of multiple pollutants from sewage.

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Reagent decontamination of liquid chrome-containing industrial wastes

Cited by 10 publications

References 8 publications

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Physical and Chemical Studies of Smelting Products of Calcinated Composite Pellets Produced from Chromium Production Waste

Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles

Efficacy of simultaneous hexavalent chromium biosorption and nitrogen removal by the aerobic denitrifying bacterium Pseudomonas stutzeri YC-34 from chromium-rich wastewater

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