Manganese Ions Removal from Industrial Wastewater

Vasile, Eugeniu; Covaliu, Cristina-Ileana; Stoian, Oana; Paraschiv, G.; Matei, Ecaterina; Catrina, Gina Alina; Ciric, Alexandru

doi:10.37358/rc.20.7.8256

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…There have been some studies on methods for the removal of manganese from a solution, such as the oxidation precipitation method [ 16 ], the ion exchange method [ 17 ], the reverse osmosis method [ 18 ] and the adsorption method, which is the more commonly used removal method [ 19 , 20 , 21 ]. Recently, with the development of nanomaterials, carbon nanotubes have been reported as the new adsorbents for the removal of heavy metal and organic pollution, such as chlorobenzenes, herbicides, heavy metal ions (Pb 2+ and Ca 2+ ), and inorganic nonmetallic ions, including F − [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization

Zhou

Mao

et al. 2023

Molecules

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Multiwalled carbon nanotubes (MWCNTs) were modified by oxidation and acidification with concentrated HNO3 and H2SO4, and the modified multiwalled carbon nanotubes (M-MWCNTs) and raw MWCNTs were characterized by several analytical techniques. Then the demanganization effects of MWCNTs and M-MWCNTs were well investigated and elucidated. The experimental data demonstrated that the adsorption efficiency of Mn(II) could be greatly promoted by M-MWCNTs from about 20% to 75%, and the optimal adsorption time was 6 h and the optimal pH was 6. The results of the kinetic model studies showed that Mn(II) removal by M-MWCNTs followed the pseudo-second-order model. Isothermal studies were conducted and the results demonstrated that the experimental data fitted well with the three models. The reliability of the experimental results was well verified by PSO–BP simulation, and the present conclusion could be used as a condition for further simulation. The research results provide a potential technology for promoting the removal of manganese from wastewater; at the same time, the application of various mathematical models also provides more scientific ideas for the research of the mechanism of adsorption of heavy metals by nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization

Zhou

Mao

et al. 2023

Molecules

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“…The issue of conservation and proper management of water reserves, emphasizing wastewater treatment (both industrial and domestic), is a priority. Industrial wastewater treatment involves applying specific processes and techniques for extracting and decomposing industry-specific pollutants [6]- [11].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Stimulation of Microbial Activity in Wastewater Treatment: Experimental Equipment

Tokos¹,

Jipa²,

Marinescu³

et al. 2021

EEA

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A system for electromagnetic stimulation of microorganisms' activity from the active sludge of wastewater treatment plants was developed and preliminarily tested. Through electrochemical, gravimetric, XRD, and SEM-EDAX measurements, it was found that austenitic stainless steel 18/8 presents good stability to AC polarization in wastewater. Preliminary determinations performed through the dielectric spectroscopy technique indicated that the activated sludge's microbial flora is sensitive to 50 ± 0.1 Hz. The stimulation system developed and put into service on the biological aerobic treatment bioreactor consists of a pair of polarizing electrodes, made of perforated 18/8 stainless steel sheet, electrically connected to a power supply, which at 50 Hz is capable of debiting adjustable voltages between 5 and 24 Vrms at a maximum current of 5 A. Preliminary in situ measurements showed that following the stimulation of the microorganisms from the sludge suspension, as a result of an applied electromagnetic field of approximately 4.5 V/m at 50 Hz, the metabolism of residues is accelerated substantially (organic residues determined by oxygen demand decrease by about 42 %, nitrogen/ammonium content by about 44% and total phosphorus by about 50 % which results in an increase in free oxygen concentration by about 71 %).

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Manganese Ions Removal from Industrial Wastewater

Cited by 2 publications

References 7 publications

Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization

Modification of Multiwalled Carbon Nanotubes and Their Mechanism of Demanganization

Electromagnetic Stimulation of Microbial Activity in Wastewater Treatment: Experimental Equipment

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