Experimental validation of waste water treatment processes aimed at metals removal

Ksenofontov, B. S.; Kozodaev, A.; Taranov, R.A.; Vinogradov, M.S.

doi:10.17580/tsm.2019.10.16

Cited by 4 publications

(2 citation statements)

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“…The prime reasons for low efficiency are the negative charge of the surface of the dispersed phase, the complexity of the flotation complex formation (negative particles, the negative charge of H 2 , O 2 bubbles), and the low recovery rate [4,9,11].…”

Section: -mentioning

confidence: 99%

“…t the enterprises where galvano-chemical processes are used for surface treatment of various metals, the sewage contains a large quantity of non-ferrous metal ions (Cu, Ni, Zn, Cd, Co, Sn, Pb, Cr, Al, Fe) as well as various acids (HCl, HNO 3 , H 2 SO 4 , H 3 PO 4 ), neutralizing of which produces inorganic salts (NaCl, NaNO 3 , Na 2 SO 4 , Na 2 CO 3 , Na 3 PO 4 ) that affect coagulation, sedimentation and flotation [1][2][3]. There are published a wide range of works on wastewater treatment from nonferrous metal ions using various methods: chemical, physico-chemical, membrane, sorption, and electrochemical [4][5][6][7][8][9]. Among the electrochemical methods for the purification of sewage from non-ferrous metal ions, electrocoagulation [5,[10][11][12] and electroflotation [13][14][15][16] are widely used.…”

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confidence: 99%

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Establishment of regularities of electroflotation extraction of non-ferrous metal (Cu, Ni, Zn, Co, Fe) hydroxides from wastewater of various compositions in the presence of industrial surfactants

Колесников¹,

Pyae²,

Davydkova³

et al. 2021

nfm

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The electroflotation process of extracting a mixture of Cu, Zn, Ni, Co, Fe hydroxides from wastewater containing NaNO 3 , NaCl, Na 2 SO 4 , Na 2 CO 3 , Na 3 PO 4 , NH 4 OH has been investigated. It was found that the maximum recovery rates of 97-99% are observed in the pH range from 8 to 11 for NaCl solutions. The electroflotation process is the least effective in Na 3 PO 4 solutions with recovery rates of 10-20%. The cationic surfactant SeptaPAV-SKhV-70 (СептаПАВ-СХВ-70) added to the solution increases the extraction ratio in the presence of phosphates by 40-50%. Low efficiency of the electroflotation process in Na 3 PO 4 is associated with a small particle size (about 20-30 μm) and a ]-potential high negative value, what has an injurious effect on the formation of the flotation complex, negatively charged bubbles (H 2 , O 2 ) and negatively charged particles. The addition of a cationic surface-active substance (SAS) reduces negative potential of the dispersed phase and increases particle sizes. All this contributes to the efficient passing of electroflotation process. Presence of a ligand (ammonia solutions) in the sewage reduces the recovery efficiency by 20-30%, especially for copper ions, which are strong complexing agents. Adding to the solution of small amounts (5 mg/l) of industrial surfactants STMs(a) (СТМх(а)) and Flon-1(c) (Флон-1(к)) at total concentration of hydroxides of 100 mg/l leads to a more efficient passing of the electroflotation process. A process flowsheet for removing suspended matters (a mixture of metal hydroxides) using an electroflotation cell and a microfiltration module is proposed. A model series of electroflotation devices with a capacity of 1-10 m 3 /h was proposed for application of the described technical solutions. The separation time in the devices does not exceed 10 minutes, power inputs is up to 0.6 kW•h per 1 m 3 of the treated wastewater with a recovery rate of 97-99%. The cost of an installation for 10 m 3 /h does not exceed 1.5 million rubles.

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Section: -mentioning

confidence: 99%

mentioning

confidence: 99%

Establishment of regularities of electroflotation extraction of non-ferrous metal (Cu, Ni, Zn, Co, Fe) hydroxides from wastewater of various compositions in the presence of industrial surfactants

Колесников¹,

Pyae²,

Davydkova³

et al. 2021

nfm

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Agroecological assessment of the effectiveness of different systems of soil protection measures in the reproduction of fertility of slope gray forest soils

Stepanova

Petelko²,

Pisareva

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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The increasing anthropogenic impact on the slopes, the involvement of new slope lands in the production sphere require reliable substantiation of their erosion resistance. The study of the effectiveness of the influence of the contour-band organization of the territory and various doses of fertilizers on the intensity of rain and snowmelt runoff, the composition and properties of flat gray forest soils was the main goal of our study. The object of the study was a plot of gray forest middle loamy soils located on the slopes of the western exposure, in 12 soil sections. The article presents a study of the influence of the contour-band structure of plots using cattle droppings and top dressing on the fertile properties of gray forest soils. We used standard research methods to determine the amount of humus and determine the aggregate properties of the soil, as well as to determine the properties of the solid phase of the soil density. We established the level of impact of the forest belt organized in the study area, while taking into account that we applied top dressing on the study area, which affects the nominal influence of factors that led to an increase in the environmental stability of the studied soils. It is proved that runoff-regulating contour forest belts provide optimization of density and increase in soil porosity, improve water-air regime, activate living organisms of agrobiocenosis, increase the thickness of the humus layer, content and reserves of humus in the soil up to 3,6% and 130,7 t/ha depending on its location on the slope. It is established that the use of fertilizers as top dressing on the studied destroyed soils significantly increases the yield of plant crops, as well as increases their environmental sustainability. The study of slopes from the standpoint of assessing, analyzing, and predicting their erosion resistance is an important direction of soil protection agriculture and in solving the food insecurity in Russia. Due to the intensive reduction of the area of agricultural land, the decrease in soil fertility, the problem of anti-erosion protection of land requires an immediate solution.

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Representation of the galvanic coagulation process using a mathematical model

Kozodaev

Шульженко

Korpusova

2021

IOP Conf. Ser.: Earth Environ. Sci.

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This work is devoted to the study of the process of water purification by galvanic coagulation. It is known that this method is promising for the extraction of toxic contaminants such as heavy metals from wastewater. However, there are no techniques or mathematical dependencies to simulate the treatment process. The paper investigated the chemical side of galvanic coagulation, and also proposed a mathematical model based on a two-stage chemical reaction model and a metal electrochemical corrosion model.

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Experimental validation of waste water treatment processes aimed at metals removal

Cited by 4 publications

References 0 publications

Establishment of regularities of electroflotation extraction of non-ferrous metal (Cu, Ni, Zn, Co, Fe) hydroxides from wastewater of various compositions in the presence of industrial surfactants

Establishment of regularities of electroflotation extraction of non-ferrous metal (Cu, Ni, Zn, Co, Fe) hydroxides from wastewater of various compositions in the presence of industrial surfactants

Agroecological assessment of the effectiveness of different systems of soil protection measures in the reproduction of fertility of slope gray forest soils

Representation of the galvanic coagulation process using a mathematical model

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