Simultaneous Adsorption of Methyl Orange and Heavy Metals from Solution Using Fly Ash

2009 ◽  
Vol 79-82 ◽  
pp. 247-250 ◽  
Author(s):  
Maria Visa ◽  
Alexandru Enesca ◽  
Anca Duta
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Methyl Orange ◽  
Treatment Process ◽  
Ionic Species ◽  
Single Step ◽  
Langmuir Model ◽  
Adsorption Mechanisms ◽  
Modified Surface ◽  
Modified Fly Ash

In a wastewater resulted from the dyes finishing industry there are amounts of dyes (very common Methyl Orange) and heavy metals resulted mainly from the organo-metallic dyes. Heavy metals (Cd2+ and Cu2+) advanced removal is usually proposed via adsorption and the use of modified fly ash as adsorbent represents a sustainable solution. The paper presents the results obtained in investigating the effect of methyl orange adsorbed onto the fly ash with modified surface, on the removal efficiency of cadmium and copper ionic species, considering the final application: a single step treatment process applied for wastewaters containing both heavy metals and dyes. The adsorption mechanisms are discussed based on the kinetic results and on the Langmuir model.

Fly Ash-Activated Carbon Powder Composites for Dyes and Heavy Metals Removal

2009 ◽  
Vol 79-82 ◽  
pp. 243-246 ◽  
Author(s):  
Maria Visa ◽  
Luminita Isac ◽  
Anca Duta
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Fly Ash ◽  
Water Discharge ◽  
Single Step ◽  
Carbon Powder ◽  
Methylen Blue ◽  
Metals Removal ◽  
Removal Of Heavy Metals ◽  
Powder Composites

Advanced wastewater treatment requires highly efficient substrates, able to insure in a single step process the water discharge requirements. The paper the results obtained in the simultaneous removal of heavy metals and dyes, using a composite powder of fly ash and activated carbon. The results show that adding a small amount of activated carbon in a powder mixture with modified fly ash is highly effective in removing cadmium from wastewaters also containing dyes (methylen blue or methyl orange). Chemisorption is the likely mechanism governing this process.

scholarly journals Study on Adsorption of Dye Wastewater by Modified Fly Ash

2021 ◽  
Vol 267 ◽  
pp. 02020
Author(s):  
Yanping Qu ◽  
Dongqing Yan ◽  
Rushuang Su ◽  
Wenshuo Hu ◽  
Yanyan Dai
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Methyl Orange ◽  
Dye Adsorption ◽  
Raw Material ◽  
Dye Wastewater ◽  
Adsorption Time ◽  
Decolorization Rate ◽  
Methyl Orange Dye ◽  
Modified Fly Ash

Used fly ash as raw material, it was modified by acid, alkali and high temperature to produce modified fly ash adsorbent, sulfuric acid modified fly ash adsorbent, sodium hydroxide modified fly ash adsorbent and high temperature modified fly ash adsorbent. In this paper, the effects of adsorbent dosage, adsorbent adsorption time, initial dye concentration, wastewater pH and temperature on dye adsorption were studied. The results showed that: the acid modified fly ash adsorbent had a good treatment effect on the dye; when the dosage of fly ash was 1.00 g, the adsorption time was 90 min, the pH of wastewater was 4, and the temperature was 45 °C, the decolorization rate of 60 mg/L methyl orange dye can reached more than 70%; when the dosage of fly ash was 0.20 g, the adsorption time was 60 min, the pH of wastewater was 3, and the temperature was 35 °C, the decolorization rate of 20 mg/L methyl orange dye can be achieved. The decolorization rate of Congo red can reached more than 80%.

scholarly journals Removal of phosphate from coating wastewater using magnetic Fe-Cu bimetal oxide modified fly ash

2015 ◽  
Vol 6 (3) ◽  
pp. 430-436 ◽  
Author(s):  
Ke Xu ◽  
He Tao ◽  
Tong Deng
Keyword(s):  
Fly Ash ◽  
Langmuir Model ◽  
Experimental Results ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Freundlich Model ◽  
Maximum Capacity ◽  
Adsorption Time ◽  
Pseudo Second Order ◽  
Modified Fly Ash

In this work, magnetic Fe-Cu bimetal oxide modified fly ash was used to remove phosphate from coating wastewater. The influences of pH, dosage amount and adsorption time on the removal of phosphate were investigated. The experimental results showed that pH had a significant effect on the adsorption of phosphate. The removal percentage of phosphate reached a maximum at pH 10. The removal efficiency of phosphate increased with the increase in adsorbent dosage. A kinetic study showed that the phosphate adsorption was well described by a pseudo second order model. The adsorption isotherm of phosphate could be described by the Langmuir model and Freundlich model. The Langmuir maximum capacity Q0 was 12.69 mg/g and the value of n of the Freundlich model was 3.82. The experimental results indicated that magnetic Fe-Cu bimetal oxide modified fly ash was a potential adsorbent for the removal of phosphate from the wastewater.

Advanced treatment of wastewater with methyl orange and heavy metals on TiO2, fly ash and their mixtures

2009 ◽  
Vol 144 (1-2) ◽  
pp. 137-142 ◽  
Author(s):  
Maria Visa ◽  
Radu Adrian Carcel ◽  
Luminita Andronic ◽  
Anca Duta
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Methyl Orange ◽  
Advanced Treatment

Conditioning of oily sludges with municipal solid wastes incinerator fly ash

1997 ◽  
Vol 35 (8) ◽  
pp. 231-238 ◽  
Author(s):  
Tay Joo Hwa ◽  
S. Jeyaseelan
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Specific Resistance ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Solid Wastes ◽  
Municipal Solid Wastes ◽  
Capillary Suction ◽  
Optimum Dosage

Conditioning of sludges improves dewatering characteristics and reduces the quantity of sludge to be handled. Anaerobic digested sludge collected from a sewage treatment plant contained 1.8% to 8% oil. The increase of specific resistance and capillary suction time (CST) with increasing oil content observed in these samples indicates the interference of oil in dewatering. It has been found that addition of municipal solid wastes incinerator fly ash decreases the specific resistances and capillary suction times of oily sludges rapidly up to 3% dosage. Beyond 3% fly ash, the decrease is less significant and the solids content in the sludge cake increases. This optimum dosage remains the same for sludges with varying oil contents from 1.8% to 12%. The total suspended solids of filtrate decreases with fly ash dosage but the toxic concentrations of heavy metals increases considerably. However at the optimum dosage of 3%, concentrations of heavy metals are within the limits for discharging into the sewers. The correlations of CST with the dewatering characteristics such as specific resistance, filter yield and corrected filter yield are established. These correlations can be used to obtain a quick prediction on dewaterability.

scholarly journals Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

2021 ◽  
Vol 13 (15) ◽  
pp. 8552
Author(s):  
Vahid Alimohammadi ◽  
Mehdi Maghfouri ◽  
Delaram Nourmohammadi ◽  
Pejman Azarsa ◽  
Rishi Gupta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Stormwater Runoff ◽  
Infiltration Rate ◽  
Stormwater Treatment ◽  
Adsorption Mechanisms ◽  
Wide Range ◽  
Adsorption Processes

Clean water is a vital need for all living creatures during their lifespan. However, contaminated stormwater is a major issue around the globe. A wide range of contaminants, including heavy metals, organic and inorganic impurities, has been discovered in stormwater. Some commonly utilized methods, such as biological, physical and chemical procedures, have been considered to overcome these issues. However, these current approaches result in moderate to low contaminant removal efficiencies for certain classes of contaminants. Of late, filtration and adsorption processes have become more featured in permeable concretes (PCs) for the treatment of stormwater. As nanoparticles have vast potential and unique characterizations, such as a higher surface area to cure polluted stormwater, employing them to improve permeable concretes’ capabilities in stormwater treatment systems is an effective way to increase filtration and adsorption mechanisms. The present study reviews the removal rate of different stormwater contaminants such as heavy metals, organic and other pollutants using nanoparticle-improved PC. The application of different kinds of nanomaterials in PC as porous media to investigate their influences on the properties of PC, including the permeability rate, compressive strength, adsorption capacity and mix design of such concrete, was also studied. The findings of this review show that different types of nanomaterials improve the removal efficiency, compressive strength and adsorption capacity and decrease the infiltration rate of PC during the stormwater treatment process. With regard to the lack of comprehensive investigation concerning the use of nanomaterials in PC to treat polluted stormwater runoff, this study reviews 242 published articles on the removal rate of different stormwater contaminants by using PC improved with nanoparticles.

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