Study of cyanide wastewater treatment by dispersion supported liquid membrane using trioctylamine and kerosene as liquid membrane

2015 ◽  
Vol 72 (4) ◽  
pp. 643-650 ◽  
Author(s):  
Guo Ping Li ◽  
Juan Qin Xue ◽  
Li Hua Yu ◽  
Ni Na Liu
Keyword(s):  
Mass Transfer ◽  
Carrier Concentration ◽  
Liquid Membrane ◽  
Removal Rate ◽  
Mass Transfer Rate ◽  
Phase Interface ◽  
Volume Ratio ◽  
Supported Liquid Membrane ◽  
Diffusion Layer Thickness ◽  
Feed Phase

A certain amount of cyanide is present in wastewater of various industrial processes, such as wet extraction of gold, coal processing, electroplating and other industries. In this work, an experimental study regarding transport of cyanide through a dispersion supported liquid membrane was performed. A model was established to describe the reaction and transport of CN(I) in the supported liquid membrane and the mass transfer kinetics equations were deduced. Through mass transfer kinetic equation it was derived that, when the carrier concentration was under certain conditions, there was a linear relationship between the reciprocal of the permeability coefficient of CN(I) (1/Pc) and n-th power of the concentration of H+ (cnH+), and the parameters Δa(δa/da) and Δo(δ0/d0) could be obtained from the slope and intercept of the straight line. Then the diffusion coefficient do and the diffusion layer thickness δo of the phase interface between the feed phase and membrane phase could be calculated. Factors affecting migration of CN(I) were analyzed, and the stable removal rate of CN(I) was more than 90% with carrier concentration (%TOA) of 2%, feed phase pH of 4, initial CN(I) concentration of 30 mg/L, stirring time of 1 hour, volume ratio of membrane solution to NaOH solution of 2:1, strip phase concentration of 2 mol/L. The results showed that the overall mass transfer rate increased first and then decreased with an increase of TOA concentration, organic-to-strip volume ratio, and strip concentration. Furthermore, the transport percentage of CN(I) was increased, the stability of membrane was enhanced, and the lifetime of the membrane was extended.

scholarly journals Removal of Acetaminophen Residues from Wastewater by Bulk Liquid Membrane Process

2020 ◽  
Vol 21 (4) ◽  
pp. 1-9
Author(s):  
Sawsan Abd Muslim Mohammed Albasri ◽  
Husna Salim Wahab
Keyword(s):  
Activation Energy ◽  
Carrier Concentration ◽  
Extraction Efficiency ◽  
Liquid Membrane ◽  
Volume Ratio ◽  
Bulk Liquid ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Nacl Concentration ◽  
Feed Phase

   The removal of Anit-Inflammatory drugs, namely; Acetaminophen (ACTP), from wastewater by bulk liquid membrane (BLM) process using Aliquat 336 (QCl) as a carrier was investigated. The effects of several parameters on the extraction efficiency were studied in this research, such as the initial feed phase concentration (10-50) ppm of ACTP, stripping phase (NaCl) concentration (0.3,0.5,0.7 M), temperature (30-50oC), the volume ratio of feed phase to membrane phase (200-400ml/80ml), agitation speed of the feed phase (75-125 rpm), membrane stirring speed (0, 100, 150 rpm), carrier concentration (1, 5, 9 wt%), the pH of feed (2, 4, 6, 8, 10), and solvent type (CCl4 and n-Heptane). The study shows that high extraction efficiency for ACTP of about 97% was achieved by a bulk liquid membrane at 50 ppm initial concentration of feed; stirring speed of feed phase 130 rpm; stirring speed of membrane phase 100rpm; 0.5 M NaCl concentration; carrier concentration 1wt%; volume ratio of 200ml feed:80ml membrane; feed pH of ACTP is 6,  and 50˚C. The transport kinetics was evaluated using a kinetic model with two consecutive first-order irreversible reactions. The kinetics of (ACTP) transport by bulk liquid membrane was investigated at the best experimental conditions. The activation energy values of the extraction and stripping processes were 1.733 and 1.826 kJ.mol−1. The activation energy confirms that the transport process from solutions is controlled by diffusion.

Study on Transportation of Cu(II) by Dispersion Supported Liquid Membrane System

2012 ◽  
Vol 549 ◽  
pp. 795-799
Author(s):  
Xiao Ning Wu ◽  
Bing Hua Yao
Keyword(s):  
Polyvinylidene Fluoride ◽  
Liquid Membrane ◽  
Ph Value ◽  
Copper Ion ◽  
Volume Ratio ◽  
Membrane System ◽  
Supported Liquid Membrane ◽  
Initial Concentration ◽  
Effects Of Ph ◽  
Feed Phase

The transportation and separation of Cu(Ⅱ) through a dispersion supported liquid membrane(DSLM) consisting of 2-ethylhexyl Phosphonic Mono-(2-Ethylhexyl) in kerosene, supported on the polyvinylidene fluoride membrane(PVDF), is studied. The effects of pH value in the feed phase, volume ratio of liquid membrane phase and hydrochloric acid, concentrations of HCl in the strip phase and initial concentration of Cu(Ⅱ) in the feed phase are also researched. The results show that copper ion can be transported effectively when pH =5.25 in the feed phase, the volume ratio is160:40, concentrations of HCl in the strip phase is 4.0mol/L. Under the optimum transport conditions, when initial concentration of Cu(Ⅱ) was 2.00×10-4mol/L, the transport rate of Cu(Ⅱ)was up to 94.7% in 130 min.

scholarly journals A Study on DSLM Transporting the Rare Earth Metal La (III) with a Carrier of PC-88A

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Shibao Lu ◽  
Yan Wang ◽  
Liang Pei ◽  
Wei Li
Keyword(s):  
Carrier Concentration ◽  
Polyvinylidene Fluoride ◽  
Liquid Membrane ◽  
Earth Metal ◽  
Volume Ratio ◽  
Supported Liquid Membrane ◽  
Dispersed Phase ◽  
Initial Concentration ◽  
Ethyl Hexyl ◽  
Hcl Solution

This paper studies transmission behavior of La (III) in dispersed supported liquid membrane (DSLM) of dispersed phase constituted by dispersed supported liquid membrane solution and HCl solution with polyvinylidene fluoride membrane (PVDF) as support and kerosene as membrane solvent, with 2-ethyl hexyl phosphonic acid-single-2-ethyl hexyl ester (PC-88A) and two-(2-ethyl hexyl) phosphoric acid (D2EHPA) as mobile carrier. It also investigates the influence of La (III) transmission by the material liquid acidity, initial concentration of La (III), HCI concentration, membrane solution, and HCI solution volume ratio, resolving agent and carrier concentration, as well as concluding that the optimal transmission and separation conditions are dispersed phase of 4.00 mol/L HCl concentration, 30:30 volume ratio of membrane solution, and HCl solution, within 0.160 mol/L controlled carrier concentration and 4.00 pH value of material liquid. Under the optimal conditions, the La (III) initial concentration of material liquid phase is 8.00 × 10–5 mol/L mol/L, 125 min, and 93.9% migration rate. Under the condition of unchanged acidity of resolving phase, HCL, H2SO4, and HNO3 as resolving agent, at 125th min, the migration rates of La (III) are 93.9%, 94.0%, and 87.8%, respectively. HCl solution, H2SO4 solution, and HNO3 solution have a certain effect on the La (III) resolution, of which 4.00 mol/L HCl solution and 2.00 mol/L H2SO4 solution are better. The effect of HNO3 is slightly lower than HCl and H2SO4.

scholarly journals Separation and Recovery of Cadmium(II) from Wastewater of Zinc Mining by Using Hollow Fiber Supported Liquid Membrane

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
S. Treephaiboon ◽  
U. Pancharoena ◽  
A. W. Lothongkumb
Keyword(s):  
Mass Transfer ◽  
Hollow Fiber ◽  
Permeability Coefficient ◽  
Liquid Membrane ◽  
Supported Liquid Membrane ◽  
Membrane Phase ◽  
Cadmium Ion ◽  
Cadmium Ions ◽  
Limiting Step ◽  
Feed Phase

The extraction and recovery of cadmium(II) via a hollow fiber supported liquid membrane (HFSLM) containing D2EHPA as a carrier dissolved in kerosene. The various effects on extraction and recovery cadmium were studied pH of feed phase, concentration of extractant and pH of stripping phase. The extraction and recovery of cadmium by using the hollow fiber supported liquid membrane method were 97% and 57%, respectively. The transport of cadmium ions was achieved by driving force of the concentration gradient. The behavior of extraction and/or recovery in HFSLM could be demonstrated in mass-transfer coefficient among feed phase, membrane phase and stripping phase. Determining the limiting step controlling the mass transfer of cadmium ion used the permeability coefficient.

scholarly journals How Electrical Heterogeneity Parameters of Ion-Exchange Membrane Surface Affect the Mass Transfer and Water Splitting Rate in Electrodialysis

2020 ◽  
Vol 21 (3) ◽  
pp. 973 ◽  
Author(s):  
Svetlana Zyryanova ◽  
Semyon Mareev ◽  
Violetta Gil ◽  
Elizaveta Korzhova ◽  
Natalia Pismenskaya ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Water Splitting ◽  
Transfer Rate ◽  
Membrane Surface ◽  
Mass Transfer Rate ◽  
Anion Exchange Membranes ◽  
Experimental Conditions ◽  
Electrospinning Technique ◽  
Diffusion Layer Thickness

Electrodialysis (ED) has been demonstrated as an effective membrane method for desalination, concentration, and separation. Electroconvection (EC) is a phenomenon which can essentially increase the mass transfer rate and reduce the undesirable water splitting effect. Efforts by a number of researchers are ongoing to create conditions for developing EC, in particular, through the formation of electrical heterogeneity on the membrane surface. We attempt, for the first time, to optimize the parameters of surface electrical heterogeneity for ion-exchange membranes used in a laboratory ED cell. Thirteen different patterns on the surface of two Neosepta anion-exchange membranes, AMX and AMX-Sb, were tested. Low-conductive fluoropolymer spots were formed on the membrane surface using the electrospinning technique. Spots in the form of squares, rectangles, and circles with different sizes and distances between them were applied. We found that the spots’ shape did not have a visible effect. The best effect, i.e., the maximum mass transfer rate and the minimum water splitting rate, was found when the spots’ size was close to that of the diffusion layer thickness, δ (about 250 μm in the experimental conditions), and the distance between the spots was slightly larger than δ, such that the fraction of the screened surface was about 20%.

Performance evaluation and effect of biogas circulation rate of a bubble column for biological desulfurization

2012 ◽  
Vol 66 (9) ◽  
pp. 1914-1922 ◽  
Author(s):  
Takuro Kobayashi ◽  
Kai-Qin Xu ◽  
Yu-You Li ◽  
Yuhei Inamori
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Removal Rate ◽  
Mass Transfer Rate ◽  
Circulation Rate ◽  
Bubble Column Reactor ◽  
Sulfate Production ◽  
Liquid Mass ◽  
Batch Tests ◽  
Liquid Mass Transfer

Biological desulfurization using a bubble column reactor was investigated in a continuous biogas treatment. Rapid biogas circulation between the digester and the bubble column for biological desulfurization was used to stimulate the gas–liquid mass transfer of H2S. A positive correlation between the biogas circulation rate and H2S removal rate was observed. Moreover, the increase in the circulation rate stimulated the O2 mass transfer, eventually translating into an increase in sulfate production from the oxidation of H2S. Throughout the continuous experiment, the reactor retained sufficient levels of sulfide-oxidizing bacteria. A comparison of the results of the continuous biogas treatment and batch tests suggests that the gas–liquid mass transfer rate of H2S was the rate-limiting step in the biological desulfurization in the reactor, indicating that the mass transfer efficiency of H2S needs to be improved to enhance the desulfurization performance.

The effective recovery of praseodymium from mixed rare earths via a hollow fiber supported liquid membrane and its mass transfer related

2011 ◽  
Vol 509 (2) ◽  
pp. 354-361 ◽  
Author(s):  
Pharannalak Wannachod ◽  
Srestha Chaturabul ◽  
Ura Pancharoen ◽  
Anchaleeporn W. Lothongkum ◽  
Weerawat Patthaveekongka
Keyword(s):  
Mass Transfer ◽  
Rare Earths ◽  
Hollow Fiber ◽  
Liquid Membrane ◽  
Supported Liquid Membrane
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