Effect of accelerated carbonation on the chemical properties and leaching behaviour of Australian coal fly ash, to improve its use as a compost amendment

2016 ◽  
Vol 75 (21) ◽  
Author(s):  
N. L. Ukwattage ◽  
P. G. Ranjith ◽  
M. S. A. Perera
2017 ◽  
Vol 166 ◽  
pp. 1-11 ◽  
Author(s):  
Abbas Mohajerani ◽  
Stephen Lound ◽  
George Liassos ◽  
Halenur Kurmus ◽  
Aruna Ukwatta ◽  
...  

2013 ◽  
Vol 127 ◽  
pp. 212-220 ◽  
Author(s):  
Grace N. Muriithi ◽  
Leslie F. Petrik ◽  
Olanrewaju Fatoba ◽  
Wilson M. Gitari ◽  
Frédéric J. Doucet ◽  
...  

2006 ◽  
Vol 137 (3) ◽  
pp. 1466-1478 ◽  
Author(s):  
L. Tiruta-Barna ◽  
Z. Rakotoarisoa ◽  
J. Méhu

Author(s):  
Daniel A. Netzel ◽  
Francis P. Miknis

Fly ash is a by-product from the combustion of coal. The 1985 annual US production was estimated to be about 1 x 108 metric tons. The utilization of fly ash during the 1980s remained stable at about 25% per year. Because of its pozzolanic properties, nearly 50% of the utilized fly ash is consumed in the production of cement and concrete. The vast quantity of fly ash that is not being used and its availability throughout the country and worldwide have motivated research for new uses in commerce and industry. Little is known of the organic adsorbent properties of fly ash. However, if they are found to be favorable, the potential commercial applications of the adsorptive characteristics of fly ash could include its use as an adsorbent sandwich for organics in combination with landfill or other dump-site liners, in traps for organics in waste waters, in filters for organics in process air streams, and as a stabilizer for organic wastes in drums. Variables that may affect the adsorbability of the fly ash towards organics in water include temperature; solution pH; and interactions between solute molecules and fly ash, and between solvent molecules and fly ash. Thus, there is an essential need to characterize each coal fly ash type to enable potential correlation between coal fly ash structural properties and the effectiveness of the adsorption characteristics of coal fly ash for immobilizing organic hazardous waste compounds. The composition and properties of pulverized fly ash depend on the type of coal burned and the nature of the combustion process. Thus, fly ashes from different origins may have significantly different sorption properties towards organic compounds of environmental interest. Eastern and western coal fly ashes differ significantly in their physical and chemical properties. The major minerals found in coal fly ash are α-quartz (SiO2), mullite (3A12O3 ·2SiO2), hematite (Fe2O3), magnetite (Fe3O4), lime (CaO), and gypsum (CaSO4·2H2O). Little is known of the coordination state and distribution of siliceous and aluminous material in coal fly ashes. Most siliceous and aluminous materials in fly ash are amorphous and thus are not detected or quantified by X-ray techniques.


2016 ◽  
Vol 48 (1) ◽  
pp. 1 ◽  
Author(s):  
Zdzisław Ciećko ◽  
Andrzej Cezary Żołnowski ◽  
Monika Madej ◽  
Grażyna Wasiak ◽  
Janusz Lisowski ◽  
...  

<p>The effect of ameliorating doses of hard coal fly ash (HCFA) on chemical properties of soil and on yields and chemical composition of crops was examined based on an experiment established in 1984. At first, typical agricultural crops were grown in the experiment, but in 1992 the field was turned into permanent grassland. The current study took place twenty-nine years after hard coal fly ash had been applied. Soil samples were collected from the 0–20 cm soil layer, corresponding to the compared treatments. The residual effect of HCFA doses increasing from 100 to 800 Mg·ha-1 caused a regular increase in the total content of Cd, Cr, Cu, Mn, Fe, Zn and Pb, as well as the forms of Zn, Cu, Mn, Fe and B soluble in 0.1 M HCl. The total content of the analyzed microelements increased by a maximum of 30% for cadmium up to 176% for zinc. The highest increase in the content of soluble forms ranged from 25% for Fe to 760% for boron. The share of Znbd, i.e. permanently bound to soil, to Zntot, i.e. the total zinc form, was positively correlated with pH in KCl, the C:N ratio and the content of Cu permanently bound with soil. Regarding the share of Febd in Fetot, correlations with pH in H2O and in KCl, content of organic matter (SOM) and the C:N ratio were demonstrated. No such correlations were proven with respect to the other elements.</p><p> </p><p>W doświadczeniu założonym w 1984 roku badano działanie melioracyjnych dawek popiołów ze spalania węgla kamiennego (hard coal fly ashes – HCFA) na właściwości fizykochemiczne gleby oraz na plonowanie i skład chemiczny roślin uprawnych. W pierwszych latach badań uprawiano typowe rośliny rolnicze, a w 1992 zmieniono charakter uprawy na trwały użytek zielony. Obecne badania wykonano po dwudziestu dziewięciu latach od zastosowania HCFA. Próbki gleby pobrano z poziomu 0–20 cm w nawiązaniu do porównywanych obiektów. Następcze działanie rosnących dawek HCFA od 100 do 800 Mg·ha-1 powodowało zarówno wyraźnie regularny wzrost zawartości całkowitej – Cd, Cr, Cu, Mn, Fe, Zn i Pb, jak i form rozpuszczalnych w 0.1 M HCl – Zn, Cu, Mn, Fe i B. Zawartość całkowita rozpatrywanych mikroskładników maksymalnie wzrosła o 30% w przypadku kadmu do 176 % w odniesieniu do cynku. Maksymalny wzrost zawartości form rozpuszczalnych kształtował się od 25 % w odniesieniu do żelaza do 760 % w przypadku boru. Udział Znbd tj. trwale związanego z glebą w stosunku do jego formy ogólnej Zntot, istotnie dodatnio korelował z pH w KCl i stosunek C:N oraz z Cu trwale związaną z glebą. W odniesieniu do udziału Febd w Fetot wykazano korelacje z pH w H2O, pH w KCl, SOM i C:N ratio. W odniesieniu do pozostałych badanych pierwiastków takich zależności nie wykazano.</p>


2013 ◽  
Vol 49 (2) ◽  
pp. 233-242 ◽  
Author(s):  
Sammy M. Nyale ◽  
Chuks P. Eze ◽  
Richard O. Akinyeye ◽  
Wilson M. Gitari ◽  
Segun A. Akinyemi ◽  
...  

2021 ◽  
Vol 8 (2) ◽  
pp. 471-480
Author(s):  
Benediktus Lucky Aditya Nugroho ◽  
Nina Dwi Lestari

Coal fly ash is a soil amendment that can be used to improve soil productivity because coal fly ash contains essential nutrients needed by plants. However, coal fly ash also contains heavy metals. This study was at a time to explore the effect of coal fly ash on soil chemical properties and lead uptake by vetiver plant (Vetiveria zizanioides L.). Treatments tested were applications of six proportion levels (0, 2.5, 5., 10, 15, and 30% by weight). The seven treatments were arranged in a completely randomized design with three replicates. The result showed that the coal fly ash had a significant effect on soil pH, total-P, total-N, total-K and Pb. The value of the Pb translocation factor from the roots to the shoot of the vetiver plant was relatively low, so that the vetiver plant was not suitable for use in phytoextraction of Pb from Pb-contaminated soil.


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