Treatment of Cr(VI) WasteWater with Modified Coal Fly Ash

2015 ◽  
Vol 768 ◽  
pp. 561-566 ◽  
Author(s):  
Jing Wang ◽  
Hui Yang Yu ◽  
Jun Fa Lin
Keyword(s):  
Fly Ash ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Coal Fly Ash ◽  
Optimum Combination ◽  
Processing Conditions ◽  
Initial Concentration ◽  
Ph Values ◽  
Single Factor Experiment ◽  
Modified Fly Ash

In this work, modified fly ash by Na2CO3 was prepared and used to remove the Cr (VI) in simulate wastewater, which was rarely reported in domestic and foreign. In the meantime, every single-factor experiment, which maybe influenced the removal ratio of Cr (VI), was done. The major-minor order of test factors and the optimum combination processing conditions influencing the treatment effects of Cr (VI) were determined according to the orthogonal experiment. The results showed that the major-minor order was initial concentration of Cr (VI), dosage of modified fly ash, adsorption duration, temperature and pH values. And the optimum combination of above discussed factors was 15 mg/L, 5 g, 90 min, 30 oC and 2.5, respectively. Under this optimum condition, the removal rate of Cr (VI) can reach more than 74.86%, approximately 1.35 times compared to that of original fly ash.

Treatment of Phenol WasteWater with Modified Coal Fly Ash-Fenton Reagent

2014 ◽  
Vol 955-959 ◽  
pp. 623-627
Author(s):  
Jing Wang ◽  
Hao Jie Li ◽  
Qian Kun Cheng ◽  
Xiao Tong Yan ◽  
Ai Qing Cao ◽  
...  
Keyword(s):  
Fly Ash ◽  
Ferrous Sulfate ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Coal Fly Ash ◽  
Phenol Removal ◽  
Fenton Reagent ◽  
Initial Concentration ◽  
Single Factor Experiment ◽  
Phenol Wastewater

Autonomous coal fly ash modified by vitriol (H2SO4) was used to treat Phenol Waste Water. The treatment influences were determined by single-factor experiment and the prioritizing importance and optimizing combination of the influences were studied using orthogonal experiment. We found that the prioritizing importance of the influencing factors was as follow: dosage of ferrous sulfate (FeSO4) > dosage of hydrogen peroxide (H2O2) > initial concentration of phenol > PH > the dosage of modified coal fly ash. The optimizing combination of the influences was 5 wt.% FeSO4, 1 mL ; 3 wt.%H2O2, 7 mL; PH=5; initial concentration of phenol , 300 mg/L and the dosage of modified coal fly ash, 200 mg/L. Under the condition above, phenol removal rate was 99.46%.

scholarly journals An Investigation of the Bacterial Influence of Acidithiobacillus Thiooxidans on Concrete Composites

2018 ◽  
Vol 45 ◽  
pp. 00021 ◽  
Author(s):  
Vlasta Ondrejka Harbulakova ◽  
Adriana Estokova ◽  
Alena Luptakova
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Acidithiobacillus Thiooxidans ◽  
Chemical Plants ◽  
Biological Factors ◽  
Sewer Pipes ◽  
Ph Values ◽  
Industrial Structures ◽  
Time Period ◽  
Microbial Environment

Vegetation and microorganisms present the biological factors that deteriorate concrete. These problems are very visible in places like sewage, underground and hydraulic structures, chemical plants, industrial structures, liquid-containing structures, agricultural structures or marine environments. The most significant biodeteriogens are the sulphur-oxidising bacteria Acidithiobacillus thiooxidans (A. thiooxidans) and the sulphatereducing bacteria (Desulfovibrio spp.) that are responsible for the so-called sulphuretum consortium. Microorganisms that produce sulphuric acid accelerate the deterioration of concrete sewer pipes in a process termed Microbially Induced Concrete Corrosion (MIC). The paper considers the assessment of the release of calcium and silicon from concrete composites with and without coal fly ash by sulphur-oxidizing bacteria. The concrete mixture contained coal fly ash as 5 wt. % and wt. 10 % cement replacement. Prepared composites were exposed to an aggressive microbial environment under laboratory conditions for 3 months. The pH values were measured and studied during this time period. A different resistance against MIC was observed for the concrete composites of different compositions. The highest amount of calcium leached-out from the concrete was in the case of the composites where 10 % cement was replaced by fly ash.

scholarly journals Modified coal fly ash as low cost adsorbent for removal reactive dyes from batik industry

2018 ◽  
Vol 154 ◽  
pp. 01037 ◽  
Author(s):  
Agus Taufiq ◽  
Pratikno Hidayat ◽  
Arif Hidayat
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Reactive Dyes ◽  
Bet Surface Area ◽  
Batch Adsorption ◽  
Operational Parameters ◽  
Solution Ph ◽  
Percentage Removal ◽  
Modified Fly Ash

The removal of reactive dyes on modified coal fly ash has been investigated during a series of batch adsorption experiments. Physical characteristics of modified coal fly ash was characterized by Brunauer Emmett Teller (BET) surface area analysis, X-ray powder diffraction (XRD), Fourier transform infrared spectrophotometer (FT-IR), and scanning electron microscope (SEM). The effects of operational parameters such as initial dye concentration (50–200 mg/L), solution pH (4–10) and adsorbent dosage (50–200 mg/L) were studied. The adsorption experiments indicated that modified coal fly ash was effective in removing of Remazol Blue. The percentage removal of dyes increased while the modified fly ash dosage increased. The percentage removal of dyes increased with decreased initial concentration of the dye and also increased with amount of adsorbent used. The optimum of removal of dyes was found to be 94% at initial dye concentration 50 g/mL, modified fly ash dosage 250 g/mL, and pH of 2.0.

Study on Extraction of Polyphenol from Grape Peel Microwave-Assisted Activity

2013 ◽  
Vol 864-867 ◽  
pp. 520-525 ◽  
Author(s):  
Hai Bo Yu ◽  
Li Feng Ding ◽  
Zheng Wang ◽  
Li Xin Shi
Keyword(s):  
Orthogonal Experiment ◽  
Processing Conditions ◽  
Single Factor ◽  
Grape Skin ◽  
Ethanol Extraction ◽  
Microwave Assisted ◽  
Polyphenol Extraction ◽  
Microwave Assistance ◽  
Single Factor Experiment ◽  
Grape Peel

In this study, we performed a single-factor experiment and an orthogonal experiment to evaluate different processing conditions during the extraction of polyphenols from grape skin using microwave-assisted ethanol extraction. In the study, we found that the best conditions for polyphenol extraction using microwave assistance were as follows: 50% ethanol (40 mL) was used to extract polyphenols from grape skin (1 g) while in a 540-W microwave for 3 min.

scholarly journals Effect of Na2O/SiO2 mole ratio on the crystal type of zeolite synthesized from coal fly ash

2003 ◽  
Vol 68 (6) ◽  
pp. 471-478 ◽  
Author(s):  
Dusica Vucinic ◽  
Igor Miljanovic ◽  
Aleksandra Rosic ◽  
Predrag Lazic
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Coal Fly Ash ◽  
Zeolite Synthesis ◽  
Crystal Type ◽  
Modified Fly Ash ◽  
Zeolitic Materials

Coal fly ash was modified to zeolitic materials by hydrothermal treatment at 90 ?C. The zeolite synthesis was studied as a function of the mole ratio of Na2O/SiO2 in the reaction mixtures. The results showed that NaP1 zeolite is obtained when the Na2O/SiO2 mole ratio was 0.7. Hydroxysodalite is the dominant zeolite phase in modified fly ash treated with a higher Na2O concentration solution (Na2O/SiO2 = 1.3). The IR and XRD methods were used to determine the phases present in the starting sample and in the zeolitic materials.

Experimental Research on Mercury-Containing Wastewater in PVC Production by Fly Ash Processing Calcium Carbide Method

2014 ◽  
Vol 878 ◽  
pp. 578-584 ◽  
Author(s):  
Yan Li ◽  
Ping Sun
Keyword(s):  
Fly Ash ◽  
Ph Value ◽  
Removal Rate ◽  
Operating Cost ◽  
Calcium Carbide ◽  
Emission Standard ◽  
Removal Capacity ◽  
Positive Treatment ◽  
The Government ◽  
Modified Fly Ash

To study the removal capacity of modified fly ash in wastewater containing mercury ions under different conditions, the dust from a calcium carbide furnace was added to fly ash, and the pyrogenic process was employed to modify the fly ash. The result indicated that the wastewater had a pH value of 9, the modified fly ash dosage was 0.2 g, the adsorption equilibrium time was 40 minutes, the reaction temperature was 30 °C, and the removal rate could reach 91.9%. Using modified fly ash in polyvinyl chloride production via the calcium carbide method to remove mercury-containing wastewater can help meet the government-prescribed emission standard. This method has advantages such as positive treatment effect, simple operation, and low operating cost.

Phosphate Removal from Aqueous Solution Using Fly Ash Modified with Fe-Cu Bimetal Oxide

2013 ◽  
Vol 438-439 ◽  
pp. 42-45 ◽  
Author(s):  
Ke Xu ◽  
Xu Luo ◽  
Chun Guang Li ◽  
Jun Ling Niu
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Efficiency ◽  
Langmuir Isotherm ◽  
Phosphate Removal ◽  
Experimental Results ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Ph Range ◽  
Modified Fly Ash

In this work the adsorption of phosphate using the Fe-Cu bimetal oxide modified fly ash was studied. The experimental results showed that phosphate could be effectively removed in the pH range between 4 and 10. The removal percentage of phosphate reached maximum at pH 6.0. The adsorption of phosphate by the modified fly ash was rapid, and the adsorption percentage of phosphate could reach 91.20% in 5 minutes. The removal efficiency of phosphate increased with the increase of adsorbent dosage and the decrease of the initial concentration. The adsorption of phosphate could be described well by Langmuir isotherm, the Langmuir constant Q0 was 26.03mg/g.

Study on the Treatment of Ammonia-Nitrogen Wastewater by Oxidization Methods

2015 ◽  
Vol 1092-1093 ◽  
pp. 938-942
Author(s):  
Lin Hao ◽  
Yu Chen ◽  
Xue Cui
Keyword(s):  
Removal Rate ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Single Factor ◽  
Reaction Parameters ◽  
Actual Wastewater ◽  
Operation Cost ◽  
Single Factor Experiment

NaClO is chosen as the best oxygen among Ca (ClO)2 and ClO2.The best experimental factors were achieved through the single factor experiment and orthogonal experiment, according to these factors, the actual wastewater project was verified. The results showed that the removal rate of ammonia-nitrogen was above 90% when the matter amounts rate was 2:7, pH=9 and the react time was 60min. Considering the operation cost, the best reaction parameters were that the matter amounts rate was 2:3, pH=7 and the react time was 30min in the actual wastewater project.

The Influence of Modification Conditions on Activation of Coal Fly Ash

2013 ◽  
Vol 813 ◽  
pp. 471-474
Author(s):  
Hui Ping Song ◽  
Fang Bin Xue ◽  
Fang Qin Cheng ◽  
Yan Xia Guo ◽  
Huai Gang Cheng
Keyword(s):  
Wastewater Treatment ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Hydrothermal Treatment ◽  
Theoretical Basis ◽  
Coal Fly Ash ◽  
Modified Fly Ash

The sodium hydroxide calcination-hydrothermal treatment was used to modify the fly ash in this paper. The mount of alkali, the ratio of solid and liquid and the temperature of calcination were respectively studied in the process of modification. The best modified condition is that the ratio of sodium hydroxide and fly ash was 0.4:1, the ratio of solid and liquid was 1:1, and the temperature of calcination was 400°C. The zeolite-like structure was generated after modification. The modified fly ash in this paper was cheap and effective, providing a theoretical basis for wastewater treatment.

Experimental Research on Mercury-Containing Wastewater by Fly Ash

2013 ◽  
Vol 456 ◽  
pp. 559-563 ◽  
Author(s):  
Yan Li ◽  
Ping Sun
Keyword(s):  
Fly Ash ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Removal Rate ◽  
Practical Application ◽  
Mercury Ions ◽  
Removal Capacity ◽  
Carbide Slag ◽  
Modified Fly Ash

To study the removal capacity of modified fly ash in wastewater containing mercury ions under different conditions, the carbide slag was added to fly ash, and the pyrogenic process was employed to modify the fly ash. The result indicated that the wastewater had a pH value of 11, the modified fly ash dosage was 2.0 g, the adsorption equilibrium time was 40 minutes, the reaction temperature was 30 °C, the removal rate could reach 97.1%, and the Freundlich-type adsorption isotherm can be used to simulate the adsorption process effectively. The modified fly ash can be used in the removal of mercury-containing wastewater, the overall result of the experiment is satisfactory, which indicates that the modified fly ash has potential value for practical application.

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