The Experts below are selected from a list of 11607 Experts worldwide ranked by ideXlab platform
Y Q Xi - One of the best experts on this subject based on the ideXlab platform.
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a comprehensive review on the applications of Coal Fly Ash
Earth-Science Reviews, 2015Co-Authors: X S Ji, Prabir Kumar Sarker, J H Tang, L Q Ge, Y Q XiAbstract:Abstract Coal Fly Ash, an industrial by-product, is derived from Coal combustion in thermal power plants. It is one of the most complex anthropogenic materials, and its improper disposal has become an environmental concern and resulted in a waste of recoverable resources. There is a pressing and ongoing need to develop new recycling methods for Coal Fly Ash. The present review first describes the generation, physicochemical properties and hazards of Coal Fly Ash at the global level, and then focuses on its current and potential applications, including use in the soil amelioration, construction industry, ceramic industry, catalysis, depth separation, zeolite synthesis, etc. Finally, the advantages and disadvantages of these applications, the mode of Fly Ash utilization worldwide and directions for future research are considered.
Neil A. Rowson - One of the best experts on this subject based on the ideXlab platform.
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a review of the multi component utilisation of Coal Fly Ash
Fuel, 2012Co-Authors: R. S. Blissett, Neil A. RowsonAbstract:Abstract Coal Fly Ash is generated during the combustion of Coal for energy production. Its utilisation as an industrial by-product has received a great deal of attention over the past two decades as more sustainable solutions to waste problems have been sought. The present paper reviews the potential applications for Coal Fly Ash as a raw material: as a soil amelioration agent in agriculture, in the manufacture of glass and ceramics, in the production of zeolites, in the formation of mesoporous materials, in the synthesis of geopolymers, for use as catalysts and catalyst supports, as an adsorbent for gases and waste water processes, and for the extraction of metals. The review then analyses the impact that a multi-stage process could have by examining the technology capable of a series of separations to produce hollow microspheres, enriched carbon, magnetic spheres, fine Ash product, and coarse Ash product. The applications for these Coal Fly Ash derived products were also reviewed. It was found that there is significant potential for the increased utilisation of Coal Fly Ash both in its raw and refined state. It is suggested that, by processing the Coal Fly Ash, the scope for creating new industrial synergies is enhanced.
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A review of the multi-component utilisation of Coal Fly Ash
Fuel, 2012Co-Authors: R. S. Blissett, Neil A. RowsonAbstract:Coal Fly Ash is generated during the combustion of Coal for energy production. Its utilisation as an industrial by-product has received a great deal of attention over the past two decades as more sustainable solutions to waste problems have been sought. The present paper reviews the potential applications for Coal Fly Ash as a raw material: as a soil amelioration agent in agriculture, in the manufacture of glass and ceramics, in the production of zeolites, in the formation of mesoporous materials, in the synthesis of geopolymers, for use as catalysts and catalyst supports, as an adsorbent for gases and waste water processes, and for the extraction of metals. The review then analyses the impact that a multi-stage process could have by examining the technology capable of a series of separations to produce hollow microspheres, enriched carbon, magnetic spheres, fine Ash product, and coarse Ash product. The applications for these Coal Fly Ash derived products were also reviewed. It was found that there is significant potential for the increased utilisation of Coal Fly Ash both in its raw and refined state. It is suggested that, by processing the Coal Fly Ash, the scope for creating new industrial synergies is enhanced. © 2012 Elsevier Ltd. All rights reserved.
R. S. Blissett - One of the best experts on this subject based on the ideXlab platform.
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a review of the multi component utilisation of Coal Fly Ash
Fuel, 2012Co-Authors: R. S. Blissett, Neil A. RowsonAbstract:Abstract Coal Fly Ash is generated during the combustion of Coal for energy production. Its utilisation as an industrial by-product has received a great deal of attention over the past two decades as more sustainable solutions to waste problems have been sought. The present paper reviews the potential applications for Coal Fly Ash as a raw material: as a soil amelioration agent in agriculture, in the manufacture of glass and ceramics, in the production of zeolites, in the formation of mesoporous materials, in the synthesis of geopolymers, for use as catalysts and catalyst supports, as an adsorbent for gases and waste water processes, and for the extraction of metals. The review then analyses the impact that a multi-stage process could have by examining the technology capable of a series of separations to produce hollow microspheres, enriched carbon, magnetic spheres, fine Ash product, and coarse Ash product. The applications for these Coal Fly Ash derived products were also reviewed. It was found that there is significant potential for the increased utilisation of Coal Fly Ash both in its raw and refined state. It is suggested that, by processing the Coal Fly Ash, the scope for creating new industrial synergies is enhanced.
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A review of the multi-component utilisation of Coal Fly Ash
Fuel, 2012Co-Authors: R. S. Blissett, Neil A. RowsonAbstract:Coal Fly Ash is generated during the combustion of Coal for energy production. Its utilisation as an industrial by-product has received a great deal of attention over the past two decades as more sustainable solutions to waste problems have been sought. The present paper reviews the potential applications for Coal Fly Ash as a raw material: as a soil amelioration agent in agriculture, in the manufacture of glass and ceramics, in the production of zeolites, in the formation of mesoporous materials, in the synthesis of geopolymers, for use as catalysts and catalyst supports, as an adsorbent for gases and waste water processes, and for the extraction of metals. The review then analyses the impact that a multi-stage process could have by examining the technology capable of a series of separations to produce hollow microspheres, enriched carbon, magnetic spheres, fine Ash product, and coarse Ash product. The applications for these Coal Fly Ash derived products were also reviewed. It was found that there is significant potential for the increased utilisation of Coal Fly Ash both in its raw and refined state. It is suggested that, by processing the Coal Fly Ash, the scope for creating new industrial synergies is enhanced. © 2012 Elsevier Ltd. All rights reserved.
Haifeng Lu - One of the best experts on this subject based on the ideXlab platform.
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sewage sludge conditioning with Coal Fly Ash modified by sulfuric acid
Chemical Engineering Journal, 2010Co-Authors: Changya Chen, Panyue Zhang, Guangming Zeng, Jiuhua Deng, Yu Zhou, Haifeng LuAbstract:Activated sludge process to treat municipal and industrial wastewater produces huge amounts of excess sludge. Chemical condition has been employed widely to improve sludge mechanical dewatering, but the cost is high, thus it is very important to find cheap and effective conditioners. This paper studied the improvement of sludge dewaterability with Coal Fly Ash modified by sulfuric acid (MCFA). Through orthogonal experiments with specific resistance to filtration (SRF) as the target index, acid concentration and soaking time were verified to be the important influencing parameters in Coal Fly Ash modification. The optimal modification conditions were: acid concentration, 4 mol l−1; ratio of acid to Coal Fly Ash, 5:1 ml g−1; soaking time, 3 h. After modification the specific surface area of Coal Fly Ash increased from 2.810 to 3.376 m2 g−1. The dewaterability and the settleability of the conditioned sludge were investigated with vacuum filtrating dewatering tests, centrifugal dewatering tests and settling experiments. The results showed that SRF of the sludge significantly decreased with Coal Fly Ash addition, and the MCFA showed much stronger conditioning capacity than the raw Coal Fly Ash (RCFA). Under a MCFA dosage of 273%, the SRF of the sludge decreased from 1.86 × 1013 to 4.23 × 1011 m kg−1, and the filter cake moisture decreased from 86.90% to 56.52%. The sludge conditioning mechanisms with MCFA mainly included improving floc formation through charge neutralization and adsorption bridging and providing the water transmitting passages by skeleton builder.
Ming Hung Wong - One of the best experts on this subject based on the ideXlab platform.
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co composting of sewage sludge and Coal Fly Ash nutrient transformations
Bioresource Technology, 1999Co-Authors: M Fang, Jonathan W C Wong, K K, Ming Hung WongAbstract:Abstract Co-composting of sewage sludge with Coal Fly Ash was carried out for evaluating the effect of Coal Fly Ash on nutrient transformations during sludge composting. Dewatered anaerobically-digested sewage sludge was mixed with sawdust used as a bulking agent at 2:1 (w/w), and the mixtures were amended with Coal Fly Ash at 0, 10, 25 and 35% (w/w) and composted for 100 days. Addition of Coal Fly Ash raised the pH of the sludge compost throughout the composting period, but significant inhibition of decomposition activity occurred only at 35% Ash amendment level. Soluble organic carbon and total C decreased according to composting time, whereas total N showed an opposite trend for all treatments. Addition of Coal Fly Ash did not affect the carbon cycle significantly except at an Ash amendment level of 35%. Coal Fly Ash amendment caused a significant loss of NH4N only during the thermophilic phase. Addition of Coal Fly Ash also inhibited the nitrification process and phosphorus transformation as indicated by the lower soluble NO3N and PO4P contents in Ash-amended sludge composts. The C/N ratios in solid and aqueous phases decreased with composting time but did not show any significant difference after 63 days of composting for all treatments indicating that Ash amendment did not affect compost maturity.