scholarly journals Enhancement of Methane Concentration by Removing Contaminants from Biogas Mixtures Using Combined Method of Absorption and Adsorption

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Muhammad Rashed Al Mamun ◽  
Shuichi Torii
Keyword(s):  
Silica Gel ◽  
Chemical Process ◽  
Methane Concentration ◽  
Adsorption Process ◽  
Iron Chloride ◽  
Combined Method ◽  
Colloidal Sulfur ◽  
Physical Absorption ◽  
Biogas Purification ◽  
Feasible System

We report a laboratory scale combined absorption and adsorption chemical process to remove contaminants from anaerobically produced biogas using cafeteria (food), vegetable, fruit, and cattle manure wastes. Iron oxide (Fe2O3), zero valent iron (Feo), and iron chloride (FeCl2) react with hydrogen sulfide (H2S) to deposit colloidal sulfur. Silica gel, sodium sulfate (Na2SO4), and calcium oxide (CaO) reduce the water vapour (H2O) and carbon dioxide (CO2). It is possible to upgrade methane (CH4) above 95% in biogas using chemical or physical absorption or adsorption process. The removal efficiency of CO2, H2S, and H2O depends on the mass of removing agent and system pH. The results showed that Ca(OH)2solutions are capable of reducing CO2below 6%. The H2S concentration was reduced to 89%, 90%, 86%, 85%, and 96% for treating with 10 g of FeCl2,Feo(with pH), Fe2O3,Feo, and activated carbon, respectively. The H2O concentration was reduced to 0.2%, 0.7%, 0.2%, 0.2%, and 0.3% for treating raw biogas with 10 g of silica gel and Na2SO4for runs R1, R2, R3, R4, and R5, respectively. Thus, given the successful contaminant elimination, the combined absorption and adsorption process is a feasible system for biogas purification.

scholarly journals BIOSORPTION OF METAL IONS Pb(II), Cu(II), AND Cd(II) ON Sargassum duplicatum IMMOBILIZED SILICA GEL MATRIX

2010 ◽  
Vol 6 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Buhani Buhani ◽  
Suharso Suharso ◽  
Zipora Sembiring
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Functional Group ◽  
Adsorption Process ◽  
Liquid Waste ◽  
Batch Method ◽  
Algae Biomass ◽  
Adsorbent Surface ◽  
Physical And Chemical ◽  
Matrix Series

Sargassum duplicatum algae biomass is biological material which has a potency to be used as a biosorbent adsorb metal ions from industrial liquid waste, because it has effective functional group as a ligand. However, the ability of the algae biomass in adsorbing of heavy metal ions has some problem such as; tiny size, low density, and easy to be degradated by other microorganism. In addition, algae biomass can not be used directly in adsorption column for its application as the biosorbent. In order to improve physical and chemical prpperties of algae biomass, it needs to be immobilized on silica gel matrix. Series of experiment have been done, morphology analysis of adsorbent surface was performed by using Scanning Electron Microscopy (SEM) and adsorption process to examine the effectiveness of algae biomass immobilized in adsorbing Pb(II), Cu(II), and Cd(II) was performed using batch method at 27 °C. Concentration of metal was determined by using Atomic Absorption Spectrophotometer (AAS) and identification of functional group was conducted using Spectrophotometer Infrared (IR). Data obtained showed that interacting among metal ions with algae biomass is optimum at a range of 60 minutes. Adsorption energies of metal ions resulted from the interaction of metal ions with the functional group of -C=O group from carboxyl and amide on algae biomass and -Si-OH group from silica were at a range of 21.09-25.05 kJ/mole.   Keywords: biosorption, silica gel, Sargassum duplicatum, immobilization

scholarly journals Adsorption of Model Dyes on Recycled Silica Gel

Proceedings ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 10
Author(s):  
Fatima Sbait Wahshi ◽  
Maitha Dhaiman Alqahtani ◽  
Manhal Abdulla ◽  
Tholkappiyan Ramachandran ◽  
Fathalla Hamed ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Adsorption Process ◽  
Food Colorants ◽  
Waste Products ◽  
Optimal Procedure ◽  
Biological Stains

Silica gel was used as an adsorbent for dyes in aqueous solutions. Afterwards, the silica gel with the adsorbed dye was heated to 600 °C, at which the dye combusted, leaving behind clean silica gel. This silica gel can be reused in the adsorption process. The operation leaves behind little waste products. It is an optimal procedure for educational and other research laboratories which are working with biological stains, food colorants and some non-commercial dyes.

Trends in COP for Adsorption Cooling Cycles With Thermal Regeneration and Finite Number of Beds

2008 ◽  
Author(s):  
Derek K. Baker ◽  
Bilgin Kaftanog˘lu
Keyword(s):  
Finite Number ◽  
Silica Gel ◽  
Thermodynamic Model ◽  
Adsorption Process ◽  
Optimum Distribution ◽  
Thermal Regeneration ◽  
Desorption Process ◽  
Cooling Cycle ◽  
Bed Temperature ◽  
Ability To Regenerate

A thermodynamic model is developed to predict trends in limiting COP of an adsorption cooling cycle with thermal regeneration between n beds, where n is any even number and each bed is spatially isothermal. The results of the model indicate the optimum distribution of beds throughout the cycle to maximize thermal regeneration. Simulations were run for silica gel-water and zeolite-water adsorbent-refrigerant pairs as the maximum bed temperature and the bed’s sensible load were varied. For the silica gel-water pair, the exothermic adsorption process occurs at lower temperatures than the endothermic desorption process, which prevents the latent loads from being thermally regenerated. This inability to regenerate latent loads results in a relatively small opportunity to increase COP through thermal regeneration, and this opportunity decreases rapidly with increasing number of beds. Conversely, for the zeolite-water pair much of the exothermic adsorption process occurs over the same temperature range as the endothermic desorption process, which allows a significant portion of the latent loads to be thermally regenerated. This ability to regenerate latent loads results in a much larger opportunity to increase COP through thermal regeneration, and this opportunity decreases much more gradually with increasing number of beds.

Adsorption of octamethylcyclotetrasiloxane on silica gel for biogas purification

Fuel ◽  
2014 ◽  
Vol 135 ◽  
pp. 205-209 ◽  
Author(s):  
Léa Sigot ◽  
Gaëlle Ducom ◽  
Belkacem Benadda ◽  
Claire Labouré
Keyword(s):  
Silica Gel ◽  
Biogas Purification

Investigating the Adsorption Process of Isoamyl Alcohol Vapor Onto Silica Gel with Near-infrared Process Analytical Technology

2014 ◽  
Vol 48 (3) ◽  
pp. 190-197
Author(s):  
Chen-Bo Cai ◽  
Yong-Yuan Tao ◽  
Bo Wang ◽  
Mei-Qiong Wen ◽  
Hong-Wei Yang ◽  
...  
Keyword(s):  
Silica Gel ◽  
Near Infrared ◽  
Adsorption Process ◽  
Process Analytical Technology ◽  
Isoamyl Alcohol ◽  
Alcohol Vapor ◽  
Analytical Technology

scholarly journals Optimasi Proses Penyerapan CO2 dengan Adsorben Karbon Aktif Menggunakan Computational Fluid Dynamics (CFD) dan Response Surface Methodology (RSM)

2019 ◽  
Vol 8 (1) ◽  
pp. 69
Author(s):  
Novi Sylvia ◽  
Lia Sobrina ◽  
Nasrun Nasrun
Keyword(s):  
Fluid Dynamics ◽  
Flow Rate ◽  
Adsorption Process ◽  
Calorific Value ◽  
Absorption Capacity ◽  
Isothermal Adsorption ◽  
Bed Height ◽  
Biogas Purification ◽  
Computational Fluid Dynamics Cfd ◽  
Percent Absorption

Biogas purification from carbon dioxide compounds due to can reduce the calorific value of methane (CH4). One application used in this case is adsorption using activated carbon. This study aims to simulate the absorption of CO2 using ANSYS R19.0 and to analyze percent adsorption, adsorption capacity and isothermal adsorption. Based on variations in bed height, flow rate and pressure, the highest percent percussion occurs at 10 cm bed height, 50 cm3/minute flow rate with a pressure of 1.4 atm and the lowest percent absorption occurs at 6 cm bed height, 150 cm3/minute flow rate with a pressure of 1.2 atm. Whereas the maximum absorption capacity occurs at 8 cm bed height, 50 cm3/minute flow rate at a pressure of 1.4 atm and minimum absorption capacity occurs at 8 cm bed height, flow rate of 150 cm3/minute at a pressure of 1 atm. This adsorption process occurs in the Langmuir isotherm with R2 approaching 1, which is equal to 0.9151. The optimization results were obtained at a flow rate of 50 cm3/minute, bed height 9.46 cm and 1.4 atm pressure.

scholarly journals New thiamine functionalized silica microparticules as a sorbent for the removal of lead, mercury and cadmium ions in aqueous media

2017 ◽  
Vol 82 (2) ◽  
pp. 215-226 ◽  
Author(s):  
Sabahattin Deniz ◽  
Neşe Taşci ◽  
Ece Yetimoğlu ◽  
Memet Kahraman
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Adsorption Process ◽  
Binding Capacity ◽  
Aqueous Media ◽  
Vitamin B1 ◽  
Isotherm Models ◽  
Potential Candidate ◽  
Functionalized Silica ◽  
Feed Concentration

The existence of heavy metal ions in aqueous media is one of the biggest environmental pollution problems and thus the removal of heavy metals is a very important procedure. In this work, a new adsorbent was synthesized by modifying 3-aminopropyl-functionalized silica gel with thiamine (vitamin B1) and characterized. The influence of the uptake conditions, such as pH, contact time, initial feed concentration and foreign metal ions, on the binding capacity of thiamine-functionalized silica gel sorbent (M3APS) were investigated. Maximum obtained adsorption capacities for Pb(II), Hg(II) and Cd(II) were 39.4?0.2, 30.9?0.5 and 9.54?0.4 mg g-1 M3APS, respectively, at pH 5.0. The observed selectivity of M3APS for these metal ions was the following: Pb(II) > Hg(II) > Cd(II). Adsorption isotherm models were also applied to the adsorption process. As a result, the Langmuir isotherm model gave the best fit for the adsorption of metal ions on M3APS. The Gibbs energy change (?G) for the adsorption of Pb(II), Hg(II) and Cd(II) were calculated to predict the nature of adsorption process. Having such satisfactory adsorption results, M3APS is a potential candidate adsorbent for Pb(II) and Hg(II) removal from aqueous media.

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