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.

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.

Advanced Treatment on Papermaking Wastewater Using Photo-Fenton Modified Fly Ash

2014 ◽  
Vol 535 ◽  
pp. 230-236
Author(s):  
Xiao Feng Jia ◽  
Wen Ning Mai ◽  
Xiao Rui Wang ◽  
Jun Zhou
Keyword(s):  
Fly Ash ◽  
Biological Treatment ◽  
Ph Value ◽  
Advanced Treatment ◽  
Toxic Substances ◽  
Reaction Conditions ◽  
Single Factor Analysis ◽  
Optimal Reaction ◽  
Modified Fly Ash ◽  
Papermaking Wastewater

There are still some recalcitrant and toxic substances contained in the papermaking wastewater after the biological treatment, so it is necessary to conduct advanced treatment. This paper designed the types and modified methods of fly ash, and then utilized the orthogonal test and single factor analysis to determine the influence of various factors and the combination of optimal levels of Photo-Fenton method of modified fly ash. The results show that the acid modified fly ash has great synergistic catalytic effect. The optimal reaction conditions of papermaking wastewater treatment using the method without adjusting the pH value of raw water are shown as follows: the dosage of fly ash is 34g/L, the dosage of H2O2 is 8.2mmol/L, the dosage of FeSO4·7H2O is 8.8mmol/L and the reaction time is controlled in 45min.In this case, the removal efficiency for COD can reach 71.72%.

scholarly journals Removal of Organic Dyes by Nanostructure ZnO-Bamboo Charcoal Composites with Photocatalysis Function

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xinliang Yu ◽  
Aimiao Qin ◽  
Lei Liao ◽  
Rui Du ◽  
Ning Tian ◽  
...  
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Ph Value ◽  
Organic Dyes ◽  
Irradiation Time ◽  
Removal Rate ◽  
Precipitation Method ◽  
Bamboo Charcoal ◽  
Acid Fuchsin ◽  
Removal Capacity

Composites of nanostructure zinc oxide (nano-ZnO) and bamboo charcoal (BC) were successfully prepared via impregnation-precipitation method. The products were characterized by XRD, SEM, and EDS. Rhodamine B (RhB) and acid fuchsin (AF) were selected as the organic dyes of photocatalysis degradation under the irradiation of ultraviolet light (UV). The influence of particle size of BC, irradiation time, pH value of the solution, and additive amount of H2O2on removal of the dyes has been studied. The results show that smaller particle size of BC in the composites has a better removal effect. The composites possess the highest removal capacity for RhB and AF under the conditions of pH = 2 and pH = 5.4, respectively. The optimum additive amount of H2O2for 5 mL RhB and AF was 0.050 mL and 0.1 mL, with a removal rate of 93% and 99%, respectively.

Study on the Treatment of Phosphate-Containing Waste Water by Modified Fly Ash

2012 ◽  
Vol 534 ◽  
pp. 328-332
Author(s):  
Juan Juan Song
Keyword(s):  
Waste Water ◽  
Sulfuric Acid ◽  
Fly Ash ◽  
Ph Value ◽  
Adsorption Efficiency ◽  
Drying Time ◽  
Phosphorus Containing ◽  
Concentrated Sulfuric Acid ◽  
The Impact ◽  
Modified Fly Ash

In this study, fly ash was modified by concentrated sulfuric acid, and it was used in the treatment of phosphorus-containing wastewater, then we have investigated the impact of the different modification conditions on the adsorption, the results show that: in the condition of 5g of fly ash by adding 0.15 mL of concentrated sulfuric acid and 3 mL water, 1.5 h of drying time, the temperature of 100°C, the effect of removaling Phosphorus is the best,and the adsorption efficiency can reach 94.6%. The adsorption rate was fast, and the adsorption can react in condition of wide pH value.

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.

Modification of Fly Ash by Sodium Tetraethylenepentamine-multi Dithiocarbamate and its Removing Performance towards Cu(II)

2011 ◽  
Vol 421 ◽  
pp. 71-76 ◽  
Author(s):  
Li Hua Liu ◽  
Bo Li ◽  
Jing Cao ◽  
Zhi Hua Zhou
Keyword(s):  
Fly Ash ◽  
Treatment Cost ◽  
Fine Particles ◽  
Removal Rate ◽  
Pozzolanic Reaction ◽  
High Specific Surface Area ◽  
Porous Crystal ◽  
Simulated Wastewater ◽  
Modified Fly Ash ◽  
Scanning Electron

A modified fly ash (MFA) was prepared from fly ash (FA) and tetraethylenepentamine-multi dithiocarbamate (TEPAMDT). The structure of MFA was characterized by FTIR, and the morphology was observed by using scanning electron microscope (SEM). Its removal perfermance towards heavy metals was assessed by employing it to the treatment of simulated wastewater containing Cu2+ and comparing with TETAMDT. The results show that the fine particles in FA assemble to form a porous crystal with high specific surface area after being modified due to the pozzolanic reaction. The dosage of MFA is far lower than that of FA and the treatment cost is less than that of TEPAMDT. The removal rate of Cu2+ can reach 100% at the dosage of MFA 412 mg/L when the Cu2+ simulated wastewater concentration is 50 mg/L. Compared with TEPAMDT, using MFA can not only increase the sedimentation rate of flocs but also reduce the volume of precipitates, and the MFA-Cu precipitate obtained is more stable than TEPAMDT-Cu in acid solution and would not cause the threat of instantly releasing heavy metal under weak acidic and alkaline environment.

Characterization Parameters in the Heavy Metal Electrokinetic Removal Process of the Fly Ash

2011 ◽  
Vol 71-78 ◽  
pp. 3628-3632 ◽  
Author(s):  
Ke Yang ◽  
Dong Wei Li ◽  
Xi Peng
Keyword(s):  
Electrical Conductivity ◽  
Fly Ash ◽  
Ph Value ◽  
Removal Rate ◽  
Electrical Current ◽  
Voltage Gradient ◽  
Solution Ph ◽  
Cathode Compartment ◽  
Removal Experiments ◽  
Rest Time

Electrokinetic removal is a new kind of technology and it is paid close attention in many countries. This work shows the laboratory results of electrodialytic removal experiments about the fly ash from municipal solid waste in Chongqing. The characterization parameters of the electrolyte solution pH, electric current, electrical conductivity, voltage gradient were discussed after the experiment. The pH value changed smoothly in the cathode compartment, while it changed abruptly in the first 6 hours, but it changed smoothly in the rest time in the anode compartment. The electrical current increased in the first 50 hours, then gradually decreased in the rest time. The higher the electrical current is, the better the removal effect is. The electrical conductivity in the anode compartment increased while the electrical conductivity decreased in the cathode compartment. The higher the electrical conductivity is, the better the removal effect is. The metal hydroxide precipitation was the most serious factor that influenced the removal rate.

Preparation of Modified Fly Ash and its Adsorption Properties for U(VI) Uranium

2017 ◽  
Vol 873 ◽  
pp. 107-111 ◽  
Author(s):  
Xi Xie ◽  
Shu Kui Zhou
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Power Plant ◽  
Contact Time ◽  
Southern China ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Performance ◽  
Uranium Tailings ◽  
Modified Fly Ash

The paper has taken a fly ash of power plant in southern China as the research object, in view of the fly ash were modified, the research of the modified fly ash on the experimental study of nuclide uranium adsorption of uranium tailings. A modified fly ash and B modified fly ash were prepared with a-zeolite while using Na2CO3 and NaOH as intercalated material respectively. By changing the pH, initial U(VI) ions concentration, temperature of environment, and contact time, the best conditions of adsorption was selected out. By comparing the properties of two different modified fly ash composites, it is not difficult to find that the theoretical adsorption capacity of U(VI) is higher and the removal rate of U(VI) is higher than that of U(VI). Therefore, modified fly ash B had a better adsorption performance.

Study on Removal of Phosphorus from Domestic Wastewater by Modified Fly Ash

2011 ◽  
Vol 396-398 ◽  
pp. 2294-2299 ◽  
Author(s):  
Rui Gang Wang
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Particle Diameter ◽  
Domestic Wastewater ◽  
Adsorption Time ◽  
Modified Fly Ash

To prevent eutrophication and to treat domestic wastewater effectively, the experiment of removing phosphorus from domestic wastewater was carried out using modified fly ash as an absorbent. The effects of fly ash particle diameter, fly ash dosing quantity, pH value, temperature, oscillating strength and adsorption time on phosphorus removal were studied. The results showed that when the fly ash size ranged from 160 mesh to 200 mesh, the fly ash dosing quantity was 25g/L, pH value was 3.5, the temperature was 50°C, the concentration of phosphorus in the domestic wastewater was 6.0 mg/L, the oscillating strength was 140r/min, and the adsorption time was 120 minutes, the removal efficiency of phosphorus could reach 94.5% and the concentration of phosphorus could reduce to under 0.5 mg/L.

A Study of Modification of Fly Ash and its Adsorption Effect on Cu2+ of Wastewater

2011 ◽  
Vol 365 ◽  
pp. 62-66
Author(s):  
Juan Juan Song ◽  
Li Tu
Keyword(s):  
Fly Ash ◽  
Ph Value ◽  
Mixing Time ◽  
Road Engineering ◽  
Adsorption Effect ◽  
Construction Engineering ◽  
Initial Concentration ◽  
Comprehensive Utilization ◽  
Copper Solution ◽  
Modified Fly Ash

The comprehensive utilization of fly ash mainly concentrated is in construction engineering channels, road engineering, it used to deal with waste water is full of hope. As this, it can achieve the purpose of using the waste to conduct waste. Fly ash was modified by a microwave radiation. This method was simple and easy to operate . When the dosage of Modified fly ash is 4g, the pH value is 6.2, the mixing time is 50min, the initial concentration of copper solution is 1.85mg/L ,Adsorption rate of modified fly ash on Cu2+ reached 96%.

Sign in / Sign up

Export Citation Format

Share Document