scholarly journals The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value

2019 ◽  
Vol 11 (3) ◽  
pp. 634 ◽  
Author(s):  
Valdas Rudelis ◽  
Tadas Dambrauskas ◽  
Agne Grineviciene ◽  
Kestutis Baltakys
Keyword(s):  
Liquid Medium ◽  
Silica Gel ◽  
Reaction Temperature ◽  
Industrial Waste ◽  
Adsorption Properties ◽  
Raw Material ◽  
Fluoride Ions ◽  
Dynamic Conditions ◽  
Stable Compound ◽  
Silica Gel Waste

In this work, we present the possibility to reduce the amount of fluoride ions in silica gelwaste by using different techniques or to immobilize these ions by creating products ofcommercial value. The leaching of fluoride ions from silica gel waste to the liquid medium wasdone under static and dynamic conditions. It was determined that the removal of fluoride ionsfrom this compound depends on various factors, such as dissociation, solubility, the w/s ratio,reaction temperature, leaching conditions, the adsorption properties of silica gel waste, and others.The obtained results showed that, by applying different techniques, the quantity of fluoride ionscan be reduced by 60%, while obtained water was neutralized by calcium hydroxide.Additionally, it was determined that silica gel waste is a promising raw material for thehydrothermal synthesis of a stable compound containing fluoride ions – cuspidine.

scholarly journals The Effect of Various Hydroxide and Salt Additives on the Reduction of Fluoride Ion Mobility in Industrial Waste

2021 ◽  
Vol 13 (3) ◽  
pp. 1554
Author(s):  
Tadas Dambrauskas ◽  
Kestutis Baltakys ◽  
Agne Grineviciene ◽  
Valdas Rudelis
Keyword(s):  
Liquid Medium ◽  
Silica Gel ◽  
Ion Mobility ◽  
Fluoride Removal ◽  
Dynamic Conditions ◽  
Treatment Conditions ◽  
Medium Flow ◽  
Silica Gel Waste ◽  
Fluorine Ions ◽  
Static Conditions

In this work, the influence of various hydroxide and salt additives on the removal of F− ions from silica gel waste, which is obtained during the production of AlF3, was examined. The leaching of the mentioned ions from silica gel waste to the liquid medium was achieved by the application of different techniques: (1) leaching under static conditions; (2) leaching under dynamic conditions by the use of continuous liquid medium flow; and (3) leaching in cycles under dynamic conditions. It was determined that the efficiency of the fluoride removal from this waste depends on the w/s ratio, the leaching conditions, and the additives used. It was proven that it is possible to reduce the concentration of fluorine ions from 10% to <5% by changing the treatment conditions and by adding alkaline compounds. The silica gel obtained after the leaching is a promising silicon dioxide source.

scholarly journals Synthesis of Zeolite-A and Zeolite-Y Using Silica Gel Waste as Silica Source and Modifying with Fe

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1376
Author(s):  
Pornnipa Khaosomboon ◽  
Kulyakorn Khuanmar ◽  
Panomchai Weerayutsil
Keyword(s):  
Surface Area ◽  
Silica Gel ◽  
Zeolite Y ◽  
Physical Adsorption ◽  
Lower Surface ◽  
Zeolite A ◽  
Silica Source ◽  
Bet Specific Surface Area ◽  
Silica Gel Waste ◽  
Modified Zeolites

The purpose of this research was to synthesize zeolite-A (Ze-A) and zeolite-Y (Ze-Y) using silica sources from silica gel waste, and also improving adsorption capacity with Fe which was trapped in the synthesized zeolites:  Ze-Fe-A and Ze-Fe-Y. All synthesized zeolites were tested with lead solution of 40 mg/L at pH 5. For BET specific surface area, the parent Ze-A and Ze-Y presented surface area of 27.02 and 211.42 m2/g, respectively, whereas Ze-Fe-A and Ze-Fe-Y presented a lower surface area of 10.90 and 28.22 m2/g, respectively. SEM and TEM image demonstrated the cubic and polygon shapes for Ze-A and Ze-Y, respectively, while their modification with Fe presented more round shape. Additionally, both modified zeolites with Fe presented higher adsorption efficiency than their parents. Although the modified zeolites gave lower surface area, the efficiency removal of lead showed higher capacity than zeolite without Fe. It could be concluded that the adsorption mechanism of modified zeolites did not only rely on physical adsorption, but also on chemical adsorption.      

Anaerobic treatment of residual lemon pulp in digesters with semi-continuous feed

2013 ◽  
Vol 67 (3) ◽  
pp. 514-520
Author(s):  
A. R. Navarro ◽  
Z. Lopez ◽  
J. Salguero ◽  
M. C. Maldonado
Keyword(s):  
Industrial Waste ◽  
Animal Feed ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Raw Material ◽  
Comparative Tests ◽  
Economic Problems ◽  
The North ◽  
Potential Applications ◽  
Continuous Feed

Lemon growing areas in the north of Argentina have industries that produce concentrated juice, peel and essential oil and generate a significant amount of liquid and solid waste as lemon pulp. In Argentina, despite the potential applications that the pulp has as animal feed and human and industrial raw material, only 10% is used for these purposes and the rest is discarded into the environment causing many ecological and economic problems. There is little information in the literature on biotechnologies for the treatment of this industrial waste. This paper shows that lemon pulp is a suitable substrate to be treated by anaerobic digestion. We obtained 86 and 92% reduction of chemical oxygen demand in a digester with a semi-continuous feed and retention time of 10 and 20 days respectively and a productivity of 0.406 g CH4/g VS h. Comparative tests showed that pre-digesting the pulp improved the process of digestion and increased biogas generation by 20%.

scholarly journals Mechanical Properties of Alkali Activated Material Based on Red Clay and Silica Gel Precursor

2021 ◽  
Vol 25 (1) ◽  
pp. 931-943
Author(s):  
Girts Bumanis ◽  
Danute Vaiciukyniene
Keyword(s):  
Silica Gel ◽  
Raw Materials ◽  
Raw Material ◽  
Alkali Activation ◽  
Production Plant ◽  
X Ray Diffraction ◽  
Red Clay ◽  
Significant Strength ◽  
Naoh Solution ◽  
Alkali Activated

Abstract The search for alternative alumosilicates source for production of alkali activated materials (AAM) is intensively researched. Wide spread of natural materials such as clays and waste materials are one of potential alternatives. In this research AAM was made from local waste brick made of red clay and calcined low-carbonate illite clay precursor and its properties evaluated. Waste silica gel containing amorphous silica from fertilizer production plant was proposed as additional raw material. 6 M and 7 M NaOH alkali activation solutions were used to obtain AAM. Raw materials were characterized by X-ray diffraction, laser particle size analyser, DTA/TG. Raw illite clay was calcined at a temperature of 700 to 800 °C. Waste brick was ground similar as raw clay and powder was obtained. Replacement of red clay with silica gel from 2–50 wt.% in mixture composition was evaluated. Results indicate that the most effective activator was 6 M NaOH solution and AAM with strength up to 13 MPa was obtained. Ground brick had the highest strength results and compressive strength of AAM reached 25 MPa. Silica gel in small quantities had little effect of AAM strength while significant strength reduction was observed with the increase silica gel content. The efflorescence was observed for samples with silica gel.

scholarly journals CONTINUOUS PRODUCTION OF PURE SQUALENE BY USING COLUMN CHROMATOGRAPHY

2010 ◽  
Vol 5 (3) ◽  
pp. 251-254 ◽  
Author(s):  
Dosis Undjung
Keyword(s):  
Silica Gel ◽  
Column Chromatography ◽  
Sea Water ◽  
Solid Phase ◽  
Continuous Production ◽  
Continuous System ◽  
Raw Material ◽  
Central Kalimantan ◽  
Shark Liver Oil ◽  
Heater Tube

The purpose of this research was to produce pure Squalene using the Chromatography Column of Continuous System, so that it will be applicable in home industry. The raw material was a Shark caught from the sea water in Katingan Regency, Central Kalimantan. The result of this research concludes that the Column Chromatography of Continuous System in the experiment was able to produce pure Squalene with the level of purification of 79.89 % out of raw material was as long 180 minutes, by the elution speed of 4 mL per minute, and the eluen (liquid of the raw material) needed was as much as 900 mL, the solution lost (2 % of dietil eter in benzene) during the process was 2.04 %, the temperature in the heater tube was 110 oC, the number of the Silica gel G 40 types as what so-called solid phase in this process to purify 90 g of raw material was 90 g, and the amount of the solution remained in the pure Squalene was 1.5 ppm. Column Chromatography of Continuous System may be applicable in home industry to produce pure Squalene from Shark Liver Oil, the materials and equipment for this activity can be easily found as they are available in markets. A further analysis is needed to find out of contained compound for its further use.   Keywords: pure squalene, continuous system, column chromatography

scholarly journals Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

2017 ◽  
Vol 2 (2) ◽  
pp. 174
Author(s):  
Rogozhnikov D.A. ◽  
Dizer O.A. ◽  
Shoppert A.A.
Keyword(s):  
Nitric Acid ◽  
Industrial Waste ◽  
Mutual Influence ◽  
Acid Leaching ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Mathematical Methods ◽  
X Ray ◽  
Nitric Acid Leaching ◽  
Kinetic Features

<p>Thermodynamic and kinetic features studies of polymetallic sulfide industrial waste nitric acid leaching were carried out. Elemental and phase composition of investigated raw material were studied with X-ray diffraction and electron microscopy methods. Calculations of the Gibbs energy change for the likely reactions of sulfide minerals with nitric acid were performed. In order to determine the most probable conditions of the sulfide industrial waste leaching in nitric acid, as well as the mutual influence of the produced pulp components on the performance of the process, the kinetics evaluation of multicomponent sulfide industrial waste in a nitric medium was studied using mathematical methods.</p>

From Wastes To Functions: Preparation of Layered Double Hydroxides From Industrial Waste And Its Removal Performance Towards Phosphates

2021 ◽  
Author(s):  
Liping Xiao ◽  
Yan Li ◽  
Qiaoping Kong ◽  
Yunlong Lan
Keyword(s):  
Langmuir Isotherm ◽  
Industrial Waste ◽  
Physical Adsorption ◽  
Raw Material ◽  
Isotherm Models ◽  
Particle Diffusion ◽  
Maximum Adsorption Capacity ◽  
Membrane Diffusion ◽  
Phosphorus Adsorption ◽  
Intra Particle Diffusion

Abstract To control eutrophication and recover phosphate from wastewater, a calcium carbide slag and red mud composite material (CR-LDH) was prepared using industrial waste as raw material for phosphorus adsorption. The morphology and structure of synthesized CR-LDH was characterized by FT-IR, SEM, EDS and XRD measurements. The experimental data can be well described by pseudo-second-order kinetics and Langmuir isotherm models, suggesting that the adsorption process of CR-LDH with respect to phosphate is a chemical and monolayer process. The theoretical maximum adsorption capacity obtained by Langmuir isotherm model is 16.06 mg·g-1 at 25 oC. The intra-particle diffusion model fitting results indicated that the adsorption of phosphate by CR-LDH was controlled by both liquid membrane diffusion and intra-particle diffusion. Phosphate was bound to CR-LDH via synergistic effect of physical adsorption, ion exchange, anion intercalation and chemical precipitation as evidenced from a combination of microscopic analysis and adsorption mechanism study. The actual phosphate-containing wastewater investigation showed that CR-LDH not only exhibited good removal effect on phosphate, but also could greatly reduce turbidity, COD and ammonia nitrogen, which was suitable for disposal of practical wastewater. These results indicate that CR-LDH can be considered as potential adsorbent for the treatment of phosphate-containing wastewater, which will be helpful to achieve the goal of "treating waste with waste and turning waste into treasure".

Agro-Industrial Waste: New Source of Raw Material for the Control of American Foulbrood in Honey Bees

2021 ◽  
pp. 300-343
Author(s):  
Pablo Giménez-Martínez ◽  
Cristina Ramírez ◽  
Florencia Fangio ◽  
Azucena Iglesias ◽  
Sandra Churio ◽  
...  
Keyword(s):  
Honey Bees ◽  
Industrial Waste ◽  
Raw Material ◽  
American Foulbrood

Adsorption Properties of Mesoporous Silica Gel with β-Cyclodextrin as a Pore-Forming Agent Relative to Moxifloxacin

2018 ◽  
Vol 73 (4) ◽  
pp. 192-198
Author(s):  
A. A. Skuredina ◽  
M. R. Danilov ◽  
I. M. Le-Deygen ◽  
E. V. Kudryashova
Keyword(s):  
Mesoporous Silica ◽  
Silica Gel ◽  
Adsorption Properties ◽  
Mesoporous Silica Gel
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