scholarly journals Leachate Treatment with a combined Fenton/filtration/adsorption processes

2019 ◽  
Vol 20 (2) ◽  
pp. 1-9
Author(s):  
Roger Iván Méndez Novelo ◽  
Armín Alejandro May Marrufo ◽  
Liliana San Pedro Cedillo ◽  
María Neftalí Rojas Valencia ◽  
Germán Giácoman Vallejos
Keyword(s):  
Adsorption Process ◽  
Packed Column ◽  
Leachate Treatment ◽  
Filtration Process ◽  
Inorganic Matter ◽  
Adsorption Processes ◽  
Treatment Train ◽  
Efficient Alternative ◽  
Filtration Stage ◽  
Adsorption Treatment

Fenton and adsorption are two of the most widely used physicochemical processes for leachates treatment. Each one separately has shown limited treatment capabilities, reaching COD removals up to 60-70%. The Fenton process oxidizes both organic and inorganic matter; nevertheless, low-density sludges are produced and hard to decant. To remove them, the filtration process could be an efficient alternative to eliminate these solids the remaining substances could be removed by means of the adsorption process. This study presents the results of a Fenton/filtration/adsorption treatment train, under the following conditions: a) Fenton: pH = 4, contact time= 60 minutes, [Fe2+]/[H2O2] = 0.6, [COD]/[H2O2] = 9; b) leachate filtered through 4 µm pore filter paper; c) adsorption was performed in a packed column with macroporous granular activated carbon. The COD removals reached 99.9%, where 90.8% was achieved with the Fenton/filtration process and 9.1% was removed by adsorption. The 95.7% of color was removed in the Fenton/filtration stage and 4.3% by adsorption. Although, the COD, BOD5, color and TSS removals from the adsorption process were lower than the Fenton/filtration process, the additional removal allows to the effluent reach the values required to meet the current Mexican Norms

Enhanced decolorization of dyes by an iron modified clay and thermodynamic parameters

2016 ◽  
Vol 73 (8) ◽  
pp. 2007-2016 ◽  
Author(s):  
N. Contreras Olivares ◽  
M. C. Díaz-Nava ◽  
M. Solache-Ríos
Keyword(s):  
Thermodynamic Parameters ◽  
Adsorption Process ◽  
Sorption Kinetics ◽  
Homogeneous Material ◽  
Modified Clay ◽  
Adsorption Capacities ◽  
Adsorption Processes ◽  
Kinetics And Isotherms ◽  
Material Temperature ◽  
Maximum Removal

The sorption processes of red 5 (R5) and yellow 5 (Y5) dyes by iron modified and sodium bentonite in aqueous solutions was evaluated. The modified clay was prepared, conditioned and characterized. The sodium clay did not remove any of either dye. The sorption kinetics and isotherms of R5 and Y5 dyes by iron modified clay were determined. The maximum removal percentages achieved were 97% and 98% for R5 and Y5, respectively, and a contact time of 72 h; the experimental data were best adjusted to Ho model. The isotherms of both dyes were best adjusted to the Langmuir model and the maximum adsorption capacities of the modified clay were 11.26 mg/g and 5.28 mg/g for R5 and Y5, respectively. These results indicate that adsorption processes have a high probability to be described as chemisorption on a homogeneous material. Temperature range between 283 and 213 K does not affect the adsorption of Y5 by the iron modified clay, but the adsorption process of R5 was affected, and the thermodynamic parameters could be calculated, which indicate a chemisorption mechanism.

scholarly journals Concentration of the carcinogenic material in a Venezuelan spindle oil by simultaneous molecular distillation and chromatographic adsorption

1944 ◽  
Vol 43 (4) ◽  
pp. 248-251
Author(s):  
J. M. Twort ◽  
R. Lyth
Keyword(s):  
Molecular Distillation ◽  
Room Temperature ◽  
Adsorption Process ◽  
Active Material ◽  
Animal Experiments ◽  
Practical Work ◽  
Inert Material ◽  
Crystalline Solids ◽  
Low Viscosity ◽  
Adsorption Processes

Some concentration of the carcinogenic material in a Venezuelan spindle grade oil has been affected by simultaneous molecular distillation, and further concentration has also been accomplished by subjecting one of the more carcinogenic of these distillates to chromatographic adsorption. Animal experiments revealed that this distillate was about twice as carcinogenic as the oil from which it was derived. Two small fractions obtained from this distillate by chromatographic adsorption were painted on the skin of a few mice and both appeared to be appreciably more carcinogenic than the distillate from which they were derived. Further experiments with one of these fractions and the distillate, not yet completed, indicate that this fraction is at least five times as strong as the distillate from which it was derived. Thus by a combination of molecular distillation and chromatographic adsorption processes we have obtained a fraction about ten times as strong as the original oil. During the chromatographic adsorption process large quantities of colourless, low index, inert or almost inert material of relatively low viscosity have been separated from the highly coloured active remainder. It would appear that the most active material is highly viscous at room temperature, but its activity may be due to the presence in it of crystalline solids.In conclusion we wish to express our thanks to our steward, Mr L. Norburn, for his valuable assistance in the practical work.

scholarly journals Characterization and Evaluation of Zeolite A/Fe3O4 Nanocomposite as a Potential Adsorbent for Removal of Organic Molecules from Wastewater

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Emmanuel Nyankson ◽  
Jonas Adjasoo ◽  
Johnson Kwame Efavi ◽  
Reuben Amedalor ◽  
Abu Yaya ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Ferrous Chloride ◽  
X Ray ◽  
Intraparticle Diffusion Model ◽  
Adsorption Processes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Chloride Salts

In this work, zeolite (Z) and Z-Fe3O4 nanocomposite (Z-Fe3O4 NC) have been synthesized. The Fe3O4 nanoparticles were synthesized using the extract from maize leaves and ferric and ferrous chloride salts and encapsulated into the zeolite framework. The nanocomposite (Z-Fe3O4 NC) was characterized using X-ray diffractometer (XRD), Fourier-transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray (EDX) spectroscopy, and scanning electron microscopy (SEM). The potential of Z-Fe3O4 NC as an adsorbent for removing methylene blue molecules (MB) from solution was examined using UV-Vis and kinetic and equilibrium isotherm models. The adsorption data fitted best with the pseudo-second-order model and Weber and Morris model, indicating that the adsorption process was chemisorption, while the Weber and Morris described the rate-controlling steps. The intraparticle diffusion model suggests that the adsorption processes were pore and surface diffusion controlled. The Langmuir isotherm model best describes the adsorption process indicating homogeneous monolayer coverage of MB molecules onto the surface of the Z-Fe3O4 NC. The maximum Langmuir adsorption capacity was 2.57 mg/g at 25°C. The maximum adsorption efficiency was 97.5%. After regeneration, the maximum adsorption efficiency achieved at a pH of 7 was 82.6%.

Atomic Layer Controlled Substitutional Doping With Lithium in ZnSe

1991 ◽  
Vol 222 ◽  
Author(s):  
Ziqiang Zhu ◽  
Mitsuo Kawashima ◽  
Takafumi Yao
Keyword(s):  
Adsorption Process ◽  
Intensity Variation ◽  
Atomic Layer ◽  
High Energy ◽  
Substitutional Doping ◽  
Dynamical Behaviors ◽  
Adsorption Processes ◽  
Li Adsorption ◽  
P Type

ABSTRACTThe detailed observation of dynamical behaviors of reflection high energy electron diffraction (RHEED) patterns during the adsorption processes of Li, Se and Zn is carried out. It is found that the RHEED intensity variation reflects the Li surface coverage during Li adsorption process on a Secovered surface. This fact enables one to control quantitatively the doping of Li “in situ”. A new method for atomic-layer controlled substitutional doping of ZnSe layers with lithium is proposed based on the RHEED investigations. The method allows the incorporation of Li dopants on Zn-sites of ZnSe by monitoring the RHEED patterns and intensities, and is expected to suppress the compensation by Li interstitials. Photoluminescence spectrum shows the growth of high quality p-type layers.

Adsorption Processes at Solid Surfaces-Studied by Electrokinetic Investigations

2006 ◽  
Vol 314 ◽  
pp. 19-24 ◽  
Author(s):  
Cornelia Bellmann ◽  
Anja Caspari
Keyword(s):  
Zeta Potential ◽  
Surface Chemistry ◽  
Solid Surface ◽  
Adsorption Process ◽  
Ph Value ◽  
Streaming Potential ◽  
Solid Surfaces ◽  
Multicomponent Mixtures ◽  
Adsorption Processes ◽  
Different Shapes

The process of electrophoretic deposition depends strongly on the electrokinetic properties and with it the surface properties of the material that will be processed. Different additives, conditioners but also the suspending liquid influence the surface of the applied material by adsorption. Electrokinetic investigations reflect changes in properties at the outermost solid surface very sensitive. Streaming potential measurements are especially suited for studying such changes of surface chemistry at solids with different shapes. Two approaches are applicable: 1. The adsorption process was done before measuring. The result of this process should be shown. In this case it will be interesting to see differences in the functionality of the solid surface. The zeta potential will be measured versus different pH value. 2. The adsorption process will be studied directly. The zeta potential will be determined versus the concentration of the adsorptive. The second approach can be used for investigation of adsorption of multicomponent mixtures. Competing adsorption processes are detectable.

scholarly journals Pembuatan Biodiesel dengan Cara Adsorpsi dan Transesterifikasi Dari Minyak Goreng Bekas

2016 ◽  
Vol 2 (1) ◽  
pp. 71-80
Author(s):  
Lisa Adhani ◽  
Isalmi Aziz ◽  
Siti Nurbayti ◽  
Christie Adi Octavia
Keyword(s):  
Particle Size ◽  
Adsorption Process ◽  
Acid Value ◽  
Raw Material ◽  
Optimal Conditions ◽  
Cooking Oil ◽  
Used Cooking Oil ◽  
Adsorption Processes ◽  
Oil Adsorption

Used cooking oil can be used as raw material for biodiesel, but the levels of free fatty acids (Free Fatty Acid, FFA) is quite high. It is necessary for pretreatment in the form of the adsorption process to reduce levels of FFA. This study aims to determine the optimal conditions of adsorption process and determine the quality of biodiesel produced from adsorption processes and transesterification. Natural zeolites are used as adsorbents activated beforehand using ammonium chloride, calcined and heated to obtain H-zeolite. Furthermore, the adsorption process optimization includes the time, the adsorbent concentration, temperature and particle size. The oil that is already in the adsorption catalyst is reacted with methanol and KOH to obtain biodiesel. The optimum adsorption conditions obtained at the time of 90 minutes, the concentration of H-zeolite 12%, temperature 90 ° C, and a particle size of 0.2 mm that can lower FFA levels from 3.2% to 1.1%. Biodiesel produced meets the quality requirements of SNI 04-7182-2006 with a water content of 0.02%, a density of 857.60 kg / m3, the acid value of 0.29 mg-KOH / g, iodine number 15.71, saponification 168 , 02 and cetane index of 75.62. Compounds contained in biodiesel are methyl 9-octadecanoic (49.45%), methyl heksadekanoat (20.79%), and methyl 9,12oktaekanoat 9.12 (18.87%). Keywords: Biodiesel, used cooking oil, adsorption, transesterification, H-zeolitDOI: http://dx.doi.org/10.15408/jkv.v2i1.3107

scholarly journals Adsorption of Malachite Green by Jordanian Diatomite Ores: Equilibrium Study

2019 ◽  
Vol 2 (1) ◽  
pp. 92-99
Author(s):  
Emad El Qada
Keyword(s):  
Particle Size ◽  
Adsorption Process ◽  
Isotherm Models ◽  
Equilibrium Isotherm ◽  
Freundlich Model ◽  
Equilibrium Study ◽  
Liquid Phase Adsorption ◽  
Experimental Parameters ◽  
Optimum Ph ◽  
Adsorption Processes

The focal theme of this work is to assess the ability of Jordanian diatomite to treat MG-bearing effluents. Effects of several experimental parameters namely, particle size of diatomite, pH and initial MG concentration were investigated through liquid-phase adsorption processes. Several equilibrium isotherm models were applied. It was found that initial MG concentration, pH and particle size of diatomite had a significant effect on the adsorption process. MG uptake has increased from 99.3 mg/dm3 to 898.7 mg/dm3 over the whole concentration range. A high percentage of MG removal (99.6%) was achieved as the diatomite particle size decreased from 500-710μm to 125-250μm. The optimum pH for the removal of MG was=9. Freundlich model was satisfactorily applied to the experimental data.

Treatment of landfill leachate by preozonation and adsorption in activated carbon columns

1996 ◽  
Vol 34 (9) ◽  
pp. 33-40 ◽  
Author(s):  
J. Fettig ◽  
H. Stapel ◽  
C. Steinert ◽  
M. Geiger
Keyword(s):  
Activated Carbon ◽  
Landfill Leachate ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Operating Conditions ◽  
Practical Case ◽  
Leachate Treatment ◽  
Homogeneous Surface ◽  
Adsorption Processes ◽  
Cost Efficient

Landfill leachate pretreated in an aerobic biological stage was studied with respect to the adsorption behaviour of its organic components with and without preoxidation by different amounts of ozone. Isotherm data evaluated by adsorption analysis showed that the fractions of non-adsorbable and weakly adsorbable species had been increased after preoxidation. As a result, the carbon capacity in a fixed-bed adsorption process was expected to be significantly lower for preoxidized leachate. This conclusion was confirmed by data from column experiments. The breakthrough curves under operating conditions typical for leachate treatment could be predicted quite well by the homogeneous surface diffusion model when no preoxidation was applied. After preozonation about 40% of the remaining organic substances were biodegradable. Data evaluation revealed that biodegradation took place inside the activated carbon beds. Therefore the total removal of ozonated leachate in activated carbon columns will be higher than the removal due to adsorption processes. An economic analysis must show in any practical case whether a combination of preoxidation and adsorption will be more cost-efficient than either of the single processes. The modelling technique applied in this study can be a useful tool for that purpose.

Selection of the Most Appropriate Leachate Treatment Methods: Part 3: A Decision Model for the Treatment Train Selection

1988 ◽  
Vol 23 (2) ◽  
pp. 341-355 ◽  
Author(s):  
D.J.L. Forgie
Keyword(s):  
Molecular Weight ◽  
Chemical Treatment ◽  
Decision Model ◽  
Initial Level ◽  
Treatment Method ◽  
Decision Models ◽  
Leachate Treatment ◽  
Physical Chemical ◽  
Treatment Train ◽  
Selection Of

Abstract This paper outlines development of a procedure for the selection of the most appropriate leachate treatment method(s) for a given leachate. The performance of aerobic biological, anaerobic biological and physical-chemical leachate treatment are discussed, based on the BOD5/COD ratio and the molecular weight of the organics in the leachate. An initial level of treatment selection screening, which is based on the BOD5/COD ratio, the molecular weight of the organics, and the volatile fatty acid (VFA), ammonia and metal concentrations is presented. Subsequent, separate decision models for anaerobic biological, aerobic biological and physical chemical treatment are also presented. It is shown that there is no one solution to leachate treatment but that a combination of anaerobic biological, aerobic biological and physical chemical treatment will be needed.

Towards Potential Removal of Malachite Green from Wastewater: Adsorption Process Optimization and Prediction

2020 ◽  
Vol 1008 ◽  
pp. 213-221
Author(s):  
Rehab M. Ali ◽  
Mohamed A. Hassaan ◽  
Marwa R. Elkatory
Keyword(s):  
Malachite Green ◽  
Adsorption Process ◽  
Complete Removal ◽  
Operating Conditions ◽  
Experimental Results ◽  
Optimum Operating ◽  
Batch Adsorption ◽  
Adsorption Processes ◽  
Physical Features ◽  
Full Factorial

Granular activated carbon (GAC) is utilized as an adsorbent for the malachite green (MG) dye removal from aqueous solutions. The GAC was characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) to realize the GAC chemical and physical features effects on the adsorption efficiency. Batch adsorption processes were carried out with different variables like pH, GAC dose, initial MG concentration and time. The response surface methodology (RSM) was used to design the experiments, model the adsorption process, optimize the operating conditions and predict the response. A 24 full factorial central composite design (CCD) was performed for the experimental design and the analysis of the results. Analysis of variance (ANOVA) was employed to determine the significance of the factors and explore the interaction between the various experimental parameters. An empirical model was derived to correlate the experimental results and predict the behavior of the GAC for the adsorption process. The model showed a good agreement with the experimental results of R2 = 0.9968 and evidenced that the optimum operating parameters are pH 10, 2 g GAC/L, 200 mg/L of MG initial concentration and 113 min adsorption time for complete removal of MG.

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