Bijenefits and Opportunities for Coal Combustion Products

2003 ◽  
Vol 14 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Peter Brennan
Keyword(s):  
Coal Combustion ◽  
New Technologies ◽  
National Level ◽  
Bottom Ash ◽  
Coal Ash ◽  
Road Construction ◽  
Combustion Products ◽  
Total Production ◽  
Local Conditions ◽  
Coal Combustion Products

At the present time some 55 million tonnes of Coal Combustion Products (CCPs) are produced each year in Europe (EU 15). These CCPs include combustion residues such as boiler slag, bottom ash and fly ash from different types of boilers as well as desulphurisation products such as spray dry absorption product and FGD gypsum. Out of this total production of 55 million tonnes of CCPs, the amount of coal ash produced is around 47 million tonnes while approximately 8 million tonnes are products obtained from flue gas desulphurisation processes. CCPs are mainly utilised in the building material industry, in civil engineering, in road construction, for construction work in underground coal mining as well as for recultivation and restoration purposes in open cast mining. The majority of CCPs are produced to meet the requirements of standards or other specifications with respect to utilisation in certain areas. The utilisation rate of CCPs differs across European countries depending upon local conditions in respect of issues such as legislation, taxes and climate. The establishment of markets for CCPs has evolved over several decades and has involved a considerable amount of product development and research. As new technologies have been introduced, such as Cleaner Coal Technology (CCT), the power industry has had to adapt by carrying out further development and research to establish both technically and environmentally acceptable utilisation options for CCPs. While much development work has been carried out at a national level, recent years have seen an increasing amount of co-operation between different countries. In Europe an organisation known as ECOBA, the European Association for Coal Combustion, ‥Products has facilitated this.

Improving nutrient availability in alkaline coal combustion by-products amended with composted animal manures

2002 ◽  
Author(s):  
Warren Dick ◽  
Yona Chen ◽  
Maurice Watson
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Bottom Ash ◽  
Coal Ash ◽  
Combustion Products ◽  
The United States ◽  
Growth Media ◽  
Fgd Gypsum ◽  
Animal Manures ◽  
The Us

Hypothesis and Objectives: We hypothesized that coal combustion products (CCPs), including those created during scrubbing of sulfur dioxide from flue gases, can be used alone or mixed with composted animal manures as effective growth media for plants. Our specific objectives were, therefore, to (1) measure the chemical, physical and hydraulic properties of source materials and prepared mixes, (2) determine the optimum design mix of CCPs and composted animal manures for growth of plants, (3) evaluate the leachate water quality and plant uptake of selected elements from prepared mixes, (4) quantify the interaction between composted animal manures and B concentrations in the mixes, (5) study the availability of P to plants growing in the mixes, and (6) determine the microbial community and siderophores involved in the solubilization of Fe and its transfer to plants. Background: In recent years a major expansion of electricity production by coal combustion has taken place in Israel, the United States and the rest of the world. As a result, a large amount of CCPs are created that include bottom ash, fly ash, flue gas desulfurization (FGD) gypsum and other combustion products. In Israel 100,000 tons of fly ash (10% of total CCPs) are produced each year and in the US a total of 123 million tons of CCPs are produced each year with 71 million tons of fly ash, 18 million tons of bottom ash and 12 million tons of FGD gypsum. Many new scrubbers are being installed and will come on-line in the next 2 to 10 years and this will greatly expand the amount of FGD gypsum. One of the main substrates used in Israel for growth media is volcanic ash (scoria; tuff). The resemblance of bottom coal ash to tuff led us to the assumption that it is possible to substitute tuff with bottom ash. Similarly, bottom ash and FGD gypsum were considered excellent materials for creating growth mixes for agricultural and nursery production uses. In the experiments conducted, bottom ash was studied in Israel and bottom ash, fly ash and FGD gypsum was studied in the US. Major Achievements: In the US, mixes were tested that combine bottom ash, organic amendments (i.e. composts) and FGD gypsum and the best mixes supported growth of tomato, wheat and marigolds that were equal to or better than two commercial mixes used as a positive control. Plants grown on bottom ash in Israel also performed very well and microelements and radionuclides analyses conducted on plants grown on bottom coal ash proved it is safe to ingest the edible organs of these plants. According to these findings, approval to use bottom coal ash for growing vegetables and fruits was issued by the Israeli Ministry of Health. Implications: Bottom coal ash is a suitable substitute for volcanic ash (scoria; tuff) obtained from the Golan Heights as a growth medium in Israel. Recycling of bottom coal ash is more environmentally sustainable than mining a nonrenewable resource. The use of mixes containing CCPs was shown feasible for growing plants in the United States and is now being evaluated at a commercial nursery where red sunset maple trees are being grown in a pot-in-pot production system. In addition, because of the large amount of FGD gypsum that will become available, its use for production of agronomic crops is being expanded due to success of this study.

scholarly journals Assessment of efficiency of rare earth elements recovery from lignite coal combustion ash via five-stage extraction

2021 ◽  
Vol 53 (2) ◽  
pp. 169-185
Author(s):  
Ljiljana Milicic ◽  
Anja Terzic ◽  
Lato Pezo ◽  
Nevenka Mijatovic ◽  
Ilija Brceski ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Coal Combustion ◽  
Extraction Procedure ◽  
Coal Ash ◽  
Principal Component ◽  
Ceramic Materials ◽  
Combustion Products ◽  
Coal Combustion Products ◽  
And Cluster Analysis

Rare earth elements (REE) are frequently referred to as ingredients for enhancements in modern industry, as they are extensively applied in many industrial branches due to their accented electro-magnetic and optical properties. REE have end-utilizations as catalysts, magnets, and as dopants for ceramic materials. Rare earth minerals are scarce therefore the unconventional REE-containing resources such as waste materials and industrial byproducts are continuously being investigated. Coal combustion products comprise REE concentrations varying between 200 ppm and 1500 ppm. This quantity can be isolated though the extraction procedure. In this study, the five stages extraction was conducted on the coal combustion ash from the selected landfill site. The extractions of 32 elements (As, Ga, Ce, Be, Ge, Nd, Cr, Zr, Eu, Cu, Nb, Gd, Co, Mo, Dy, Li, Ag, W, Mn, Cd, Au, Ni, In, Hg, Pb, Sn, Tl, V, Sb, Th, Zn, and La) were conveyed. Chemical analyses were conducted via XRF, ICP-OES, ICP-MS, and AAS techniques. The complexity of the obtained data was examined by Principal component analysis and Cluster analysis in order to derive interconnections between quantity of elements and landfill characteristics, as well as mutual relationships among the elements of interest, and to assess the accomplishment of REE recovery from the coal ash.

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