Utilization of cationic polymer-modified fly ash for dye wastewater treatment

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.

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Hydrothermally modified fly ash for heavy metals and dyes removal in advanced wastewater treatment

Applied Surface Science ◽

10.1016/j.apsusc.2014.02.025 ◽

2014 ◽

Vol 303 ◽

pp. 14-22 ◽

Cited By ~ 85

Author(s):

Maria Visa ◽

Andreea-Maria Chelaru

Keyword(s):

Heavy Metals ◽

Wastewater Treatment ◽

Fly Ash ◽

Advanced Wastewater Treatment ◽

Modified Fly Ash ◽

Dyes Removal

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Study on Adsorption of Dye Wastewater by Modified Fly Ash

E3S Web of Conferences ◽

10.1051/e3sconf/202126702020 ◽

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%.

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Simultaneous wastewater decoloration and fly ash dechlorination during the dye wastewater treatment by municipal solid waste incineration fly ash

Desalination and Water Treatment ◽

10.5004/dwt.2011.2696 ◽

2011 ◽

Vol 32 (1-3) ◽

pp. 179-186 ◽

Cited By ~ 7

Author(s):

Qiang Liu ◽

Yingmei Zhou ◽

Luquan Zou ◽

Tao Deng ◽

Jia Zhang ◽

...

Keyword(s):

Wastewater Treatment ◽

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Waste Incineration ◽

Dye Wastewater ◽

Municipal Solid Waste Incineration ◽

Waste Incineration Fly Ash

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A Low‐Cost 3D Spherical Evaporator with Unique Surface Topology and Inner Structure for Solar Water Evaporation‐Assisted Dye Wastewater Treatment

Advanced Sustainable Systems ◽

10.1002/adsu.202000245 ◽

2020 ◽

pp. 2000245

Author(s):

Baohua Yuan ◽

Chaofan Zhang ◽

Ying Liang ◽

Lixia Yang ◽

Huawei Yang ◽

...

Keyword(s):

Wastewater Treatment ◽

Low Cost ◽

Surface Topology ◽

Water Evaporation ◽

Dye Wastewater ◽

Solar Water ◽

Unique Surface

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Preparation of chitosan modified fly ash under acid condition and its adsorption mechanism for Cr(VI) in water

Journal of Central South University ◽

10.1007/s11771-021-4724-8 ◽

2021 ◽

Vol 28 (6) ◽

pp. 1652-1664

Author(s):

Chun-lu Jiang ◽

Rui Wang ◽

Xing Chen ◽

Liu-gen Zheng ◽

Hua Cheng

Keyword(s):

Fly Ash ◽

Adsorption Mechanism ◽

Acid Condition ◽

Modified Fly Ash

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A constructed wetland model for synthetic reactive dye wastewater treatment by narrow-leaved cattails (Typha angustifolia Linn.)

Water Science & Technology ◽

10.2166/wst.2009.500 ◽

2009 ◽

Vol 60 (6) ◽

pp. 1565-1574 ◽

Cited By ~ 18

Author(s):

S. Nilratnisakorn ◽

P. Thiravetyan ◽

W. Nakbanpote

Keyword(s):

Wastewater Treatment ◽

Constructed Wetland ◽

Cell Structure ◽

Salt Content ◽

Textile Wastewater ◽

Reactive Dye ◽

Wastewater Management ◽

Textile Dye ◽

Dye Wastewater ◽

Term Operation

Textile wastewater is contaminated by reactive dye causing unattractive levels of wastewater color, high pH and high salt content when discharged into public water systems. Decolorization of textile wastewater by plant, phytoremediation, is an alternative, sustainable method which is suitable for long term operation. Narrow-leaved cattails are one species of wetland plant with efficiency for decolorizing and remediating textile wastewater. In addition, chemical oxygen demand (COD) can be lowered and dye residue can be removed. The plant also showed a good salt tolerance even after being exposed to a salt solution for 15 days. The narrow-leaved cattails were set up in a constructed wetland model with a vertical flow system operating from bottom to top for synthetic reactive dye wastewater (SRDW) removal. Narrow-leaved cattails could achieve the removal of SRDW at approximately 0.8 gSRDW m−2 day−1. Decolorization of SRDW by this plant was approximately 60%. The advantage of this method is that it is suitable for textile wastewater management and improvement of wetland. These plants could lower COD, remove dye, sodium and total dissolved solids (TDS) whereas other biological and chemical methods could not remove TDS and dye in the same time. These results suggested that the spongy cell structure of this plant has the ability to absorb large amounts of water and nutrients. Physico-chemical analysis revealed increasing amounts of sulfur, silicon, iron and calcium in the plant leafs and roots after exposure to wastewater. Proteins or amide groups in the plant might help in textile dye removal. Regarding decolorization, this plant accumulates dye in the intercellular space and still grows in this SRDW condition. Hence, it can be noted here that narrow-leaved cattails are efficient for textile dye wastewater treatment.

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