scholarly journals Assessment of Natural Radionuclides in Fly Ash Produced at Orji River Thermal Power Station, Nigeria and the Associated Radiological Impact

2014 ◽  
Vol 06 (10) ◽  
pp. 752-759 ◽  
Author(s):  
Janet A. Ademola ◽  
Uzoma C. Onyema
Keyword(s):  
Fly Ash ◽  
Thermal Power Station ◽  
Natural Radionuclides ◽  
Thermal Power ◽  
Power Station ◽  
Radiological Impact

scholarly journals Indicators of pedogenesis of Technosols developed in an ash settling pond at the Bełchatów thermal power station (central Poland)

2018 ◽  
Vol 69 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Łukasz Uzarowicz ◽  
Wojciech Kwasowski ◽  
Olga Śpiewak ◽  
Marcin Świtoniak
Keyword(s):  
Organic Matter ◽  
Fly Ash ◽  
Soil Organic Matter ◽  
Total Nitrogen ◽  
Thermal Power Station ◽  
Thermal Power ◽  
Bottom Ash ◽  
Power Station ◽  
Settling Pond ◽  
Technogenic Soils

Abstract Technogenic soils (Technosols) developed in an ash settling pond at the Bełchatów thermal power station, central Poland, were studied in order to identify soil property transformations over 30 years of pedogenesis. Standard pedological methods were applied in order to determine the properties of the studied samples. All investigated soils were classified according to WRB as Spolic Technosols with various supplementary qualifiers (Alcalic/Hypereutric, Arenic/Loamic, Protocalcic, Hyperartefactic, Immisic, Laxic, Ochric, and Protosalic). The studied materials can be arranged into a chronosequence starting from fresh (unweathered) ashes, by young Technosol BE1 (age: several months), up to older Technosols BE2 (about 20 years) and BE3 (about 30 years). The studies showed that weathering and soil-forming processes changed properties of ash in soil environment. Fresh ash was characterized by high pH (11.0 – fly ash, 8.7 – bottom ash), low content of carbonates (1.5% in both samples), variable concentrations of TOC (1.2% – fly ash, 6.9% – bottom ash), and very low total nitrogen content (0.04%). Electrical conductivity (ECe) was 2.6 and 2.1 dS·m−1 in fly ash and bottom ash respectively. Young Technosol BE1 had the pH 9.2–10.0, contents of carbonates were in the range 2.4–3.3%, TOC 1.3–1.7%, and total nitrogen less than 0.03%. ECe in young Technosol was in the range 2.7–4.0 dS·m−1. There was no plant cover present on that soil and no well-developed genetic horizons were distinguished in the profile. Finally, old Technosols BE2 and BE3 had lower pH (from 7.9 up to 9.1), and, in general, higher contents of carbonates (from 1.5 to 7.9%) than fresh ash and young Technosol BE1. Old Technosols contained high concentrations of TOC (up to about 38% in Oi horizon) and total nitrogen (up to 0.9%) in the topsoil, where O and A horizons developed due to accumulation of soil organic matter. ECe in old Technosols was in the range 0.8–1.5 dS·m−1. All studied ashes and soils were characterized by very low or even absence of total potential acidity. Base cations predominated in the sorption complex of the investigated ash and soils and can be arranged in the following order according to the abundance: Ca>Mg>K>Na. Base saturation (BS) of fresh ashes and Technosols was nearly 100%. The study shows that the first indicators of pedogenesis of the studied technogenic soils within the first 30 years of formation are: (1) changes of consistence of ash material from firm to friable/very friable due to root action, (2) accumulation of soil organic matter in the topsoil and formation of O and A horizons, (3) decrease of pH, (4) formation of pedogenic carbonates in soils and (5) decrease in soil salinity.

scholarly journals Characterisation of fly ashes from 4th Thermal Power Station of Ulaanbaatar city and its applicability for a zeolite synthesis

2014 ◽  
Vol 12 ◽  
pp. 16-19
Author(s):  
J Temuujin ◽  
A Minjigmaa ◽  
B Davaabal ◽  
Z Ochirbat
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Power Station ◽  
Thermal Power ◽  
Particle Diameter ◽  
Area Measurement ◽  
Power Station ◽  
X Ray

Fly ash from 4th thermal power station of Ulaanbaatar city have been characterised by x-ray fluorescence (XRF), x-ray diffractometry (XRD), particle size analyzer, specific surface area measurement (BET) and scanning electron microscope (SEM) observation. It was found that fly ash from Baganuur coal contains over 15 wt.% of calcium oxide (CaO) and could be assigned as class C fly ash, according to the International classification. Specific surface area of this fly ash was 2.75 m2/g and mean particle diameter was 59.5 μm. Zeolitic compounds were synthesised by using mixture of this fly ash and a transition aluminium oxide under hydrothermal treatment at 100, 150 and 200°C temperatures for a different duration. Various zeolitic compounds including Na-faujasite and sodium aluminosilicate were synthesised as reaction products.DOI: http://dx.doi.org/10.5564/mjc.v12i0.164 Mongolian Journal of Chemistry Vol.12 2011: 16-19 

scholarly journals Study on the Granulation of FLY Ash from Thermal Power Station

2019 ◽  
pp. 185-188
Author(s):  
Ganka Kolchakova
Keyword(s):  
Fly Ash ◽  
Apparent Density ◽  
Compression Strength ◽  
Thermal Power Station ◽  
Thermal Power ◽  
Total Porosity ◽  
Power Station ◽  
Binding Substance

The effect of the type and amount of binding substance on the yield and strength of granules prepared from fly ash was studied. The highest yield of granules was achieved with clayish slip used as binder. The granules obtained are brittle, with compression strength 0,1МРа. The apparent density of the sintered granulates was in the range1200-1500kg/m3 and the total porosity was 55-40%.

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