This paper mainly studied migration and transformation characteristics of dissolved organic matter (DOM) in underground aquifers. To achieve the research purpose, we carried out the dynamic column experiments of the DOM at different conditions indoors. In the experiment, the water of Wujiang River from Pingdingshan Coal-field is used as water sample, meanwhile, fine sand and marl rock are used as testing rock sample. A comparative study on migration and transformation characteristics of the DOM in different rock samples is done. The results show that, in the fine sand, the main effects are convection and dispersion, while the adsorption and biological effects are very weak. However, in the marl rock, besides existing convection and dispersion, the adsorption and biological effect are quite significant. And in the marl rock, convection and dispersion plays a major role in the early experiment, while adsorption is the main effect in the medium term, then the biodegradation dominates the final stage. With the increasing of temperature and seepage velocity in the fine sand, the impact of the convection effect becomes gradually weak, the dispersion effect gradually enhances, and, however, convection effect is still playing a dominant role. With the temperature rising in the marl rock, the adsorption effect becomes weak, but biodegradation is enhanced. As the seepage velocity increases in the marl rock, the adsorption and biodegradation both decrease.
- IWA Publishing
- Migration and transformation characteristics of DOM in fine sand ...
Rotomite 6000 dredge system - centennial coal-case study
Centennial Coal`s Mannering Colliery mine averages over 1M tons of coal per year when operating at full capacity. The mine`s run-off ponds` sludge issues prompted Centennial to contact Dredging Solutions, SRS Crisafulli`s Dealer in Australasia, and an experienced dredging contractor. Dredging solutions deployed the Crisafulli Rotomite 6000 auger suction dredge system because of the equipment`s ability to handle difficult projects at a competitive rate.Using their self-propelled manned Crisafulli Rotomite 6000...
Hydrophobic aggregation of fine particles in high muddied coal slurry water
The hydrophobic aggregation of fine particles in high muddied coal slurry water in the presence of four quaternary ammonium salts of 1231(dodecyl trimethyl ammonium chloride), 1431(tetradecyl trimethyl ammonium chloride), 1631(cetyl trimethyl ammonium chloride) and 1831(octadecyl trimethyl ammonium chloride) was investigated through the measurement of contact angles, zeta potentials, aggregation observation, adsorption and sedimentation. The results show that quaternary ammonium salts can enhance the hydrophobicity...
MSHA: What’s the Real Impact of Fines on Mine Safety?
Late in 2014, MSHA made headlines when an investigation revealed that nearly $70 million in health and safety penalties had yet to be paid by mining company owners. The joint investigation by news agency NPR and Mine Safety and Health News found that most of these unpaid penalties were between two and 10 years overdue. In response to the pressure that followed this report, a federal investigation was launched that will focus on the penalty assessment and collection process at MSHA. More recently, a similar...
Difficult Complex Decisions For Coal-fired Power Plant Operators
Changing fuel prices, government regulations and technology all combine to make decision making difficult for operators and developers of coal-fired power generation facilities around the world. Power plant designers in developing countries face new local environmental regulations plus additional requirements stipulated by lenders such as the World Bank. In the developed world, the regulations keep getting tougher. So operators must not only deal with the current round of upgrades but the next round as well. Rece...
Cleaning of Dukki (Baluchistan) coal by oil agglomeration process
Cleaning of coal fines by oil agglomeration is an efficient technique by which an appreciable recovery of combustible matter and significant reduction in ash forming minerals are possible. In this study, oil agglomeration process has been employed to clean indigenous coal under the influence of parameters such as oil type, particle size and the pH value of aqueous medium. As agglomerant, castor oil, canola oil proved to be successful, giving 75% and 64% yields of agglomerates, respectively. The gross calorific...