Management of Coal Fly Ash in Remediation Process

Abstract

The present research relates to class of adsorbents obtained by systematic biopolymer modification of cenospheres transfigured from coal fly ash (CFA): an immense waste by-product of coal based thermal power plant, method of preparation thereof and their use in wastewater treatment contaminated by tanneries, distilleries, cosmetics, textiles, plastics, pulp and paper industries, paints, electroplating and food processing industries effluents. Removal percentage of disperse dyes had better correlated with Langmuir isotherm, tested among Freundlich, Temkin and Redlich-Peterson isotherm which indicated saturated monolayer attachment of dye molecules onto the surface of adsorbent with maximum capacity 500.4 and 500.0 mg/g for Disperse Orange 25 (DO) and Disperse Blue 79:1 (DB) dyes, respectively. The uptake rate of dye molecules followed pseudosecond order kinetics in all cases. Recovery of dye molecules was completed best in three cycles with acetic acid for CFA and cenospheres, with Di-chloromethane for CNAC and in four cycles with non-polar solvent (chloroform) for zeolite and CNCH nanocomposite. The used adsorbents could easily be dumped into landfill with in concrete pit liming, or can also be used in brick making to minimize the environmental risk.

The application of photoelectrocatalysis in the degradation of rhodamine B in aqueous solutions: a review

“…For instance, they prevent the growth of aquatic organisms and limit the self-purication of water. 9,10 Additionally, when humans and animals are exposed to water polluted with textile dyes, they face many health hazards. Thus, the negative impacts of water pollution by textile dyes are related to health, economic and environmental issues.…”

Individual Dye Removal Efficiencies in a Ternary Dye Mixture by Electrocoagulation

“…Most of them are stable to light, heat, and chemical oxidation and resistant to either biological degradation or aerobic digestion. Depending on their chemical structure, they can be applied to different materials 10.…”

One‐Pot Electrochemical Synthesis of Citric Acid Functionalized Iron Oxide Magnetic Nanoparticles for Congo Red Adsorption

“…[ 3 ] The accumulation of dyes in the water bodies negatively affects the marine life and human health due to their noxious and mutagenic effects. [ 4 ] Organic dyes like synthetic azo dyes which account for 60–70% of dyes consumption have detrimental potential to decline aquatic oxygen and hamper photosynthetic processes when released in water sources without treatment. [ 5 ] Furthermore, azo dyes also bioaccumulate in humans initiating harmful respiratory and neurological health effects.…”