Possible applications of coal fly ash in wastewater treatment

Mushtaq, Farwa; Zahid, Muhammad; Bhatti, Ijaz Ahmad; Nasir, Subriyer; Hussain, Tajamal

doi:10.1016/j.jenvman.2019.03.054

Cited by 214 publications

(81 citation statements)

References 230 publications

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“…It has been established that the based detergents can be substituted cost-effectively by zeolites due to their water softening performance and non-toxic characteristics. CFAZ have been widely studied as adsorbents and ion-exchangers for water treatment technologies [44,45]. The softening effect of CFAZ nanocomposites of Linde and Faujasite types were studied revealing between 30% and 60% of hardness reduction from the levels typical for drinking waters (Tab.…”

Section: Water Treatmentmentioning

confidence: 99%

Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

et al. 2020

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High-grade zeolite nanocomposites are synthesized utilizing solid by-products from combustion of coal for energy production in Thermal Power Plants applying alkaline aging, hydrothermal and fusion-hydrothermal activation procedures. The obtained coal ash zeolites were studied with respect to their chemical and phase composition, morphology, surface parameters and thermal properties. It was found that they are distinguished in nanocrystalline morphology and significant content of iron oxide nanoparticles (γ-Fe2O3, α-Fe2O3, γ-Fe3O4) and doping elements (Cu, Co, Mn, V, W, etc.) transferred from the raw coal ash, and therefore they are assumed as nanocomposites. Coal fly ash zeolite nanocomposites are characterized by a mixed micro-mesoporous texture, significant concentration of acidic Brønsted centers due to their high surface insaturation, high chemical and thermal stabilty. This unique combination of compositional and textural properties predetermines the application of these materials as catalysts for thermal oxidation processes, anticorrosion barrier coatings, carbon capture adsorbents, matrices for hosting functional groups, detergents etc. Examples for coal fly ash zeolite applications for substitution of critical raw materials in practice are provided.

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Section: Water Treatmentmentioning

confidence: 99%

Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

et al. 2020

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“…Fly ash (FA), ground granulated blast-furnace slag (GGBS) and natural zeolite, all exhibit pozzolanic properties and are conventionally used in concrete as partial cement replacement materials for improvement of durability, among other beneficial effects [5][6][7][8][9]. Various researchers have demonstrated the potential of FA as an effective adsorbent for wastewater treatment [10][11][12]. Partial replacement of pervious concrete with FA has been shown to improve the workability of fresh concrete and the mechanical strength and durability of hardened concrete [13].…”

Section: Introductionmentioning

confidence: 99%

Interactive Relationship between Cementitious Materials and Acid Mine Drainage: Their Effects on Chromium Cr(VI) Removal

Shabalala

Basitere

2020

Minerals

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Elevated hexavalent chromium (Cr(VI)) levels in pervious concrete may undermine its successful application in water treatment. Portland cement CEM I 52.5R (CEM I), coal fly ash (FA), natural zeolite and ground granulated blast-furnace slag (GGBS) were evaluated as adsorbents for removal of Cr(VI) from acid mine drainage (AMD). Adsorption experiments were conducted at dosages of 6, 10, 30 and 60 g of adsorbent in 200 mL of AMD, while the mixing contact time was varied from 15 to 300 min. It was found that the use of CEM1 and FA adsorbents strongly increased the Cr(VI) concentration in AMD. Conversely, zeolite and GGBS removed up to 76% and 100% of Cr(VI) from AMD, respectively, upon their use at dosages of at least 10 g of the adsorbent. Freundlich isotherm was found better fitted with a high correlation coefficient (R2 = 0.998 for zeolite and 0.973 for GGBS) than to the Langmuir model (R2 = 0.965 for zeolite and 0.955 for GGBS). Adsorption and ion exchange seem to be active mechanisms for the Cr(VI) removal. These results suggest that zeolite and GGBS can be considered as partial cement replacement materials for effective reduction or removal of Cr(VI) from the treated water.

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“…FA has shown to be an effective adsorbent for separating several heavy metals from water. Some attempts have been made to modify the surface of fly ash particles using eco-friendly methods in order to obtain superior adsorption capacity [30][31][32].Fly ash has proven its effectiveness in industrial wastewater and domestic wastewater treatment due to its composition and micro/nano structure. Considerable efforts are made to improve the adsorption capacity of fly ash.…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals from industrial wastewater using fly ash on pilot scale

2020

IJETER

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The separation of Cu, Zn and Fe ions from industrial wastewater using fly ash (FA) was applied and evaluated. Fly ash was developed from Mazut's incineration, used in brick factories. Fly ash has been dried and sieved into various particles size (600, 300, 150, 75μm). A pilot plant with flow rate 200 L/ hr of industrial wastewater discharge was designed and implemented. The process was conducted to study the efficiency of Cu, Zn and Fe ions removal from industrial wastewater using fly ash. Efficient reduction of heavy metals in presence of micro-particles of fly ash is achieved up to 100 %. Concentrations of fly ash are used within the range of 5-15 g / L. Low cost adsorbent shows high efficient removal from industrial wastewater of Cu, Zn , and Fe.

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Possible applications of coal fly ash in wastewater treatment

Cited by 214 publications

References 230 publications

Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

Interactive Relationship between Cementitious Materials and Acid Mine Drainage: Their Effects on Chromium Cr(VI) Removal

Removal of heavy metals from industrial wastewater using fly ash on pilot scale

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