Adsorption of Volatile Phenol in Coking Wastewater by Diatomite

2012 ◽  
Vol 573-574 ◽  
pp. 648-653
Author(s):  
Qi Yuan Gu ◽  
Gen Wu ◽  
Xi Ning Lu
Keyword(s):  
Reaction Temperature ◽  
Contact Time ◽  
Removal Rate ◽  
Phenol Removal ◽  
High Concentration ◽  
Phenol Adsorption ◽  
Volatile Phenol ◽  
Organic Pollutants Removal ◽  
Alkaline Conditions ◽  
Pollutants Removal

Coal process wastewater that discharged from coal conversion processes usually contains volatile phenol in high concentration. As a natural mineral, diatomite demonstrates its excellent adsorption performance especially in organic pollutants removal. Diatomite was used for phenol removal in cokingwastewater by adsorption and the effect of diatomite dosage, contact time, salinity, intitial pH conditon and reaction temperature were investigated. It was observed that the removal rate of phenol increased with an increase in the diatomite dosage and contact time. The solution salinity could inhibit the phenol adsorption onto diatomite slightly by cometitive adsorption. Alkaline conditions were especially favorable for phenol removal. The increased reaction temperature could improve phenol adsorption to a large extent as well.

scholarly journals A high Mn(II)-tolerance strain, Bacillus thuringiensis HM7, isolated from manganese ore and its biosorption characteristics

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8589 ◽  
Author(s):  
Huimin Huang ◽  
Yunlin Zhao ◽  
Zhenggang Xu ◽  
Yi Ding ◽  
Xiaomei Zhou ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Contact Time ◽  
Indoleacetic Acid ◽  
Removal Rate ◽  
Soil Samples ◽  
Manganese Ore ◽  
High Concentration ◽  
16S Rdna Sequence ◽  
16S Rdna Sequence Analysis ◽  
Metal Absorption

Microorganisms play a significant part in detoxifying and immobilizing excessive metals. The present research isolated a strain (HM7) with high Mn(II) tolerance from Mn(II)-contaminated soil samples. The 16S rDNA sequence analysis showed that HM7 had a 99% similarity to Bacillus thuringiensis, which can survive under a high concentration 4,000 mg/L of Mn(II), and the highest removal rate was up to 95.04% at the concentration of 400 mg/L. The highest Mn(II) removal rate was detected at the contact time 72 h, temperature 30 °C, and pH 5.0, while the differences in strain growth and Mn(II) removal rate among different inoculation doses were insignificant. Scanning electron microscopy indicated B. thuringiensis HM7 cells appeared irregular and cracked under Mn(II) stress. Fourier transform infrared exhibited that functional groups like carboxyl, hydroxyl, amino, sulfhydryl groups, and amide bands might take part in the complexation of Mn(II). In addition, HM7 suggested the ability of indoleacetic acid production, siderophore production, and P’ solubilization potential. Therefore, HM7 might have a potential to promote metal absorption by changing the form of heavy metals, and the experiments supported the application of B. thuringiensis HM7 as a biological adsorbent in Mn(II) contaminated environment remediation.

Adsorption of Phenol in Wastewater Using Nano Grapheme Oxide-Chitosan-Bentonite Absorbent

2020 ◽  
Vol 11 (4) ◽  
pp. 368-380
Author(s):  
Alireza Jadid ◽  
Shadab Shahsavari ◽  
Aliakbar Seifkordi ◽  
Ali Vaziri Yazdi
Keyword(s):  
Graphene Oxide ◽  
Adsorption Process ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Phenol Removal ◽  
Phenol Adsorption ◽  
Absorption Isotherm ◽  
Optimum Formulation ◽  
Nano Graphene ◽  
Kinetics Of

Background and Objectives: Contamination of surface and groundwater sources with aromatic compounds such as phenolic compounds is one of the newest environmental problems that humans encountered it today. One of the ways to remove these pollutants is the use of polymeric adsorbents. In this study, chitosan-bentonite-nano-graphene oxide nanosorbent was synthesized to investigate the phenol adsorption. Material and Methods: In this research, experimental design was performed using Design-Expert 7.0 software to investigate the effect of independent variables including nano graphene oxide, chitosan and bentonite on the dependent variable (phenol removal rate). Moreover, phenol absorption isotherm, kinetics and thermodynamics, were also examined. Results: Eventually, the optimum formulation of nano-adsorbent with specifications of 0.1 g of chitosan, 0.18 g of bentonite and 0.07 g of nano-graphene oxide was investigated. Optimal adsorption conditions were also obtained at a concentration of 100 ppm, pH=5 and 45 minutes of absorption time. Conclusion: Finally, it was found that the synthesized nanosorbent follows the Langmuir isotherm, which represents physical adsorption, and also the kinetics of the adsorption process is the diffusion between particles. As a result, it was found that the optimal application of this nano-adsrbent is in wastewaters with a temperature of less than 400 °C.

Manganese Removal from Electrolytic Manganese Residue Using Ozone

2014 ◽  
Vol 997 ◽  
pp. 754-757
Author(s):  
Wen Qiang Yang ◽  
Juan An ◽  
Xiao Li Yuan ◽  
Wen Tang Xia
Keyword(s):  
Reaction Temperature ◽  
Contact Time ◽  
Manganese Oxides ◽  
Removal Rate ◽  
Experimental Investigations ◽  
Limit Values ◽  
Valence States ◽  
Electrolytic Manganese ◽  
Electrolytic Manganese Residue ◽  
Initial Ph

This paper deals with experimental investigations related to removal of manganese (II) from electrolytic manganese residues by using ozone as oxidant. Ozone was used in this study to oxidize manganese converting bivalent manganese to high valence states, the oxidized salts will precipitate as manganese oxides, that to reach the concentration of the pollutant under its limit values in water. Effects of reaction temperature, reaction contact time and initial pH value on the manganese (II) removal were investigated. The results indicated that the removal rate exceeded 99.9 percent, and the manganese (II) in solution was lower than 0.1 mg·L-1 under the conditions of reaction temperature 45 °C, reaction contact time 40 min and initial pH 12.

Organic Pollutants Removal of Polluted Water Body by a Hybrid Biofilm Reactor Using Filamentous Bamboo as Bio-Carrier

2012 ◽  
Vol 209-211 ◽  
pp. 1977-1980
Author(s):  
Wen Ping Cao ◽  
Hou Hu Zhang ◽  
Yin Mei Wang
Keyword(s):  
Organic Pollutants ◽  
Water Body ◽  
Removal Rate ◽  
Biofilm Reactor ◽  
Cod Removal ◽  
Polluted Water ◽  
Landscape Water ◽  
Organic Pollutants Removal ◽  
Cod Removal Rate ◽  
Pollutants Removal

The purpose of this study is to investigate the efficiency and characteristics for treatment of polluted landscape water using filamentous bamboo as bio-carrier. Results demonstrated that the COD removal rate could be increased more 13% because glucose was added into the raw. And the COD removal was mainly decided for the biofilm on the filamentous bamboo, which is 2.53 times higher than activitcd sludge in a batch hybrid unit. Additionally, Rich biological phases was obversed during the test.

scholarly journals Kinetic and Prediction Modeling Studies of Organic Pollutants Removal from Municipal Wastewater using Moringa oleifera Biomass as a Coagulant

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2052 ◽  
Author(s):  
Bashir Adelodun ◽  
Matthew Segun Ogunshina ◽  
Fidelis Odedishemi Ajibade ◽  
Taofeeq Sholagberu Abdulkadir ◽  
Hashim Olalekan Bakare ◽  
...  
Keyword(s):  
Moringa Oleifera ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Low Cost ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Multiple Observations ◽  
Organic Pollutants Removal ◽  
Seed Biomass ◽  
Pollutants Removal

This study investigated the potential of Moringa oleifera (MO) seed biomass as a coagulant for the removal of turbidity, biochemical oxygen demand (BOD), and chemical oxygen demand (COD) of municipal wastewater. Triplicated laboratory experiments using MO coagulant added at varying treatment dosages of 50, 100, 150, 200 mg/L, and a control (0 mg/L) treatment were performed for a settling period of 250 min at room temperature. Kinetics and prediction variables of cumulative turbidity, BOD, and COD removal were estimated using simplified first order and modified Gompertz models. Results showed that the maximum removal of turbidity, BOD, and COD were 94.44%, 68.72%, and 57.61%, respectively, using an MO dose of 150 mg/L. Various kinetic parameters, such as rate constant (r), measured (REm) versus predicted (REp) cumulative removal, and specific pollutant removal rate (µm), were also maximum when an MO dose of 150 mg/L was added, the standard error being below 5%. The developed models were successfully validated over multiple observations. This study suggests low cost and sustainable removal of turbidity, BOD, and COD of municipal wastewater using MO seed biomass as a coagulant.

scholarly journals Characterization of Nanoporous Ceramic Granules Made with Coal Fly Ash and Their Utilization in Phenol Removal from Water

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Zhaoqian Jing
Keyword(s):  
Fly Ash ◽  
Contact Time ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Unburned Carbon ◽  
Phenol Removal ◽  
Phenol Adsorption ◽  
Main Components ◽  
Uniform Diameter ◽  
Physical And Chemical

Coal fly ash has been evaluated as low-cost material for pollutants adsorption. But powdered fly ash is difficult to be separated from the adsorbate and solution after saturation. When it is made into granules, this problem can be solved. Granules with uniform diameter of 6 mm were prepared and used as adsorbents for phenol removal from aqueous solution. The physical and chemical characteristics of the granules were investigated. The data indicated that the granules were abundant with nanosize pores of 9.8 nm on average. The specific surface area and porosity reached 130.5 m2/g and 60.1%, respectively. The main components in the granules were SiO2, Al2O3, MgO, Fe2O3, CaO, K2O, and unburned carbon. The adsorption batch experiments showed that this granular material was an efficient adsorbent for phenol removal. Phenol adsorption on the granules was mainly influenced by dosage and contact time. Increase in the dosage could enhance phenol adsorption effectively. More than 90% phenol could be removed under normal temperature and neutral pH with initial concentration of 100 mg/L, contact time of 90 min, and dosage of 140 g/L. The adsorption of phenol on the granules was spontaneous and complied well with the pseudo-second-order model and Langmuir isotherm model.

scholarly journals Efficient phenol removal from aqueous solution using iron-coated pumice and leca as an available adsorbents: evalution of kinetics and isotherm studies

2018 ◽  
Vol 21 (2) ◽  
pp. 91-97
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Phenol Removal ◽  
Phenol Adsorption ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Simple Implementation ◽  
Pseudo Second Order ◽  
Isotherm And Kinetic Models

<p>Searching for low cost, accessible, simple implementation, and environmentally friendly adsorbents has been one of the concern of researchers in recent years. Therefore, the aim of this study was to investigate the efficient phenol removal from a synthetic aqueous solution using iron-coated pumice and LECA as an available adsorbents. Bath adsorption experiments were carried out to evaluate the effects of the independent variables such as pH (3-5-7-9-11), initial concentration of phenol (10-50mg/L), contact time (10-60 min) and different concentrations of pumice and LECA (0.2-1 g/100 cc) on the phenol adsorption. The results of the experiments showed that there was a direct relationship between the phenol removal efficiency and increasing the contact time and the adsorbent dosage but it has reverse relationship with the increasing of pH and phenol initial concentration. The optimal condition of parameters for phenol removal were 200 rpm agitation speed, 0.6 g adsorbent dosage, 30 min contact time, and 20 mg/L initial phenol concentration. The study of isotherm and kinetic models showed that the experimental data of the phenol adsorption process were correlated with Freundlich (R2pumice=0.9749, R2LECA=0.9487) and Pseudo-second order (R2pumice=0.9745, R2LECA=0.9486) models. Based on this study’s results, the modified pumice and LECA have a high ability to remove the phenol compounds from aqueous solution.</p>

Shear Loss Characteristics of an Aerobic Biofilm

1992 ◽  
Vol 26 (3-4) ◽  
pp. 595-600 ◽  
Author(s):  
S. M. Rao Bhamidimarri ◽  
T. T. See
Keyword(s):  
Growth Rate ◽  
Shear Stress ◽  
Film Thickness ◽  
Removal Rate ◽  
Surface Growth ◽  
Phenol Removal ◽  
Concentric Cylinder ◽  
Substrate Utilisation ◽  
Utilisation Rate ◽  
Net Growth Rate

Growth and shear loss characteristics of phenol utilizing biofilm were studied in a concentric cylinder bioreactor. The net accumulation of the biofilm and the substrate utilisation were measured as a function of torque. Uniform biofilms were obtained up to a thickness of around 300 microns, beyond which the surface growth was non-uniform. The substrate utilisation rate, however, reached a constant value beyond film thickness of 50 to 100 microns depending on the operational torque. The maximum phenol removal rate was achieved at a shear stress of 3.5 Nm-2. The effect of shear stress on net growth rate was found to be described byand a zero net growth was obtained at a shear stress of 18.7 Nm-2.

Accelerated Phenol Removal by Amplifying the Metabolic Pathway with a Recombinant Plasmid Encoding Catechol 2, 3 Oxygenase

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2191-2194 ◽  
Author(s):  
M. Fujita ◽  
M. Ike ◽  
T. Kamiya
Keyword(s):  
Metabolic Pathway ◽  
Recombinant Plasmid ◽  
Removal Rate ◽  
Phenol Degradation ◽  
Wild Strain ◽  
Phenol Concentration ◽  
Phenol Removal

The metabolic pathway of the phenol degradation in Pseudomonasputida BH was amplified by introducing the recombinant plasmid containing catechol 2,3 oxygenase gene isolated fron the chromosome of BH. This strain could degrade phenol and grow much faster than the wild strain at the phenol concentration of 100mg/L. This strain seems to accelerate the phenol removal rate if it is applied to the treatment of wastewater containing phenol.

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