Electroflotation in Waste Water Treatment: Results and Perspectives

Romanov, A.M.

doi:10.1007/978-94-017-2284-1_17

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…this cost is depreciated by: (1) reduction in collector consumption, or perhaps even work collectorless; (2) greater flotation rate; (c) better quality of concentrate; (d) possibility of complete use of raw materials or effective recycling (including by-products recovery); and (e) use of this technique for cases to which the other processes could not be applied successfully. Certainly, a long time ago (in 1940), Soviet scientists proposed that fines can be collected more effectively by finer bubbles [52].…”

Section: Electroflotationmentioning

confidence: 99%

Flotation in Water and Wastewater Treatment

2018

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Flotation constitutes a separation process that originated from mineral processing. Nowadays, wider applications have been found and compared to flotation for water and wastewater treatment. Stress in the present review paper was mainly applied to heavy metal ions recovery by flotation and the respective mechanism followed, being either ion, precipitate, or sorptive flotation. In the latter case, the use of adsorbents is included (such as powdered activated carbon, zeolites, and goethite), as well as various biosorbents. The flotation of the following metals was reviewed: copper, zinc, nickel, lead, iron, chromium, arsenic, gold, and others. The bubble generation method could be applied for typical dispersed-air flotation column, electroflotation, or dissolved-air flotation; the latter being the most appropriate established technique in water treatment. The role of particle size (for example, studying flotation of salt-type mineral fines) was also examined.

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Section: Electroflotationmentioning

confidence: 99%

Flotation in Water and Wastewater Treatment

2018

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“…This effect is probably stipulated by the nature of dispersed phase, which presents itself hydroxides of the researched metals being a base for sorption of CO 3 2-ions. Owing to it, electrokinetic potential moves in the area with more negative values - (12)(13)(14)(15)(16)(17)(18)(19) mV and size of dispersed phase decreases by 10-15 % in comparison with solutions containing ОНions. Lowering of efficiency of electroflotation process in the presence of РО 4 3-ions is caused by severe decrease of ]-potential of dispersed phase for slightly soluble phosphates (-(35-43) mV).…”

Section: Discussionmentioning

confidence: 99%

“…Electroflotation process can be realized only in the case when contaminating components in the solution are presented in the form of slightly soluble compounds or are sorbed during flotation on other slightly soluble compounds which are presented in the solution [13]. Extraction of metal ions as hydroxides via pH variation by alkali in the solutions is an efficient and simple method of their transition in the form of slightly soluble compounds.…”

Section: Introductionmentioning

confidence: 99%

The pH and medium composition impact on the efficiency of electroflotation-based extraction of slightly soluble iron, chromium and manganese compounds from water solutions and physical-chemical properties of these compounds

Brodskiy¹,

Zhukov²,

Malkova³

et al. 2021

cisisr

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The study demonstrates the pH and solution ion composition impact on the average hydrodynamic diameter dm and electrokinetic potential (]-potential) of the dispersed phase of slightly soluble ferrous metals compounds. We examined formation dispersed phases of slightly soluble Fe (III), Cr (III), and Mn (II) compounds in the presence of OН -, CO 3 2-, PO 4 3ions as precipitating agents and anionic, cationic, and non-ionic flocculating agents. The electroflotation-based extraction of slightly soluble ferrous metals compounds was found to be directly linked to dispersity and electrokinetic potential of particles, that depend on acidity and ionic medium composition. The maximal hydrodynamic diameter of dispersed phases of the slightly soluble Fe (III), Cr (III), and Mn (II) compounds were observed at isoelectric point and corresponded with pH value of the minimal dispersed phase solubility. In this case, electroflotation-based extraction was more efficient, the iron (III), manganese (II), and chromium (III) removal D reached 98, 96, and 83 %, respectively. Cationic flocculating agent additives increased the iron, manganese, and chromium extraction up to 99, 98, and 94 %, respectively. If carbonate and phosphate ions were added, the electrokinetic potential of compounds of all examined slightly soluble metals changed to negative values: -(12-19) mV in the presence of CO 3 2ions and -(35-43) mV in the presence of PO 4 3ions. This shift hindered coagulation and decreased electroflotation-based extraction of the dispersed phases, especially in case of manganese compounds (D d 10%). Cationic and non-ionic flocculating agents additives balanced the high negative charge of the dispersed phases of slightly soluble ferrous metals compounds, enlarged the removal up to 98 % depending on the dispersed phase and flocculating agent.

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“…The electroflotation process (EF) is a technique to remove suspended particles and metal ions from wastewater [16][17][18][19][20][21][22] under a fixed composition of water which has been applied in many industries but until now has not been considered in the mining industry for the removal of ultrafine clays (colloids) present in saline electrolytes [23][24][25][26]. However, the removal of kaolinite or clays from different effluents without Cl − ions present in the electrolytes has been studied using EF and EC techniques [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

et al. 2023

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The presence of ultrafine clay particles that are difficult to remove by conventional filtration creates many operational problems in mining processing systems. In this work, the removal of clay suspensions has been investigated using an electroflotation (EF) process with titanium electrodes. The results show that EF is a viable and novel alternative for removing ultrafine particles of kaolinite-type clay present in sedimentation tank overflows with low salt concentrations (<0.1 mol/L) in copper mining facilities based on the saline water splitting concept. Maximum suspended solid removal values of 91.4 and 83.2% in NaCl and KCl solutions, respectively, were obtained under the experimental conditions of the constant applied potential of 20 V/SHE, salinity concentration of 0.1 mol/L, and electroflotation time of 10 and 20 min in NaCl and KCl solutions, respectively. Furthermore, the visual evidence of particle aggregation by flocculation during the experiments indicates a synergy between EF and electrocoagulation (EC) that enhances the removal of ultrafine particles of kaolinite.

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Electroflotation in Waste Water Treatment: Results and Perspectives

Cited by 11 publications

References 8 publications

Flotation in Water and Wastewater Treatment

Flotation in Water and Wastewater Treatment

The pH and medium composition impact on the efficiency of electroflotation-based extraction of slightly soluble iron, chromium and manganese compounds from water solutions and physical-chemical properties of these compounds

Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

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