The material recovery methods used by dust-yards in early 19 th century London, England and the conditions that led to their development, success and decline are reported. The overall system developed in response to the market value of constituents of municipal waste, and particularly the high coal ash content of household 'dust.' The emergence of lucrative markets for 'soil' and 'breeze' produ...

clean hydrogen is the major energy carrier for power production. the conversion of co to co2 and zero emission during hydrogen energy production causes high capital cost. it is a matter of prestige to optimize the process in order to make zero emission and cost effective production of clean hydrogen energy and electric power. in this era, coal gasification is the most promising technology for t...

There are several phenomenons for polluting the environment, especially in coalfields; which coal spontaneous combustion is one of them. The moisture content is one of the intrinsic characteristics of coal, which has an important role in the occurrence of this phenomenon. Therefore, this research predicts the coal spontaneous combustion tendency based on moisture content. The percentage of mois...

this paper investigates householders’ attitudes to the recycling of solid wastes in one part of northern malaysia, namely alor setar town, kedah state. a postal questionnaire survey was administered to households in alor setar town in selected areas of high, middle and low incomes. 389 responses were obtained, a response rate of 86.4%. a personal interview with an official of the municipal co...

recycling process is one of the most important processes in the trend of sustainable development,a logical reaction against the problems that results from industrial age. building materials can play an important rolein the process of a building formation or destruction, in fact, materials forms the building nature. thus, the role ofmaterial and the impact of its recycling in sustainable develop...

The concentration, distribution, profile and possible source of polycyclic aromatic hydrocarbons (PAHs) in soil were studied in Guiyu, an electronic waste (E-waste) recycling center, using primitive technologies in Southeast China. Sixteen USEPA priority PAHs were analyzed in 49 soil samples (0-10 cm layer) in terms of individual and total concentrations, together with soil organic matter (SOM)...

The material recovery methods used by dust-yards in early 19th century London, England and the conditions that led to their development, success and decline are reported. The overall system developed in response to the market value of constituents of municipal waste, and particularly the high coal ash content of household 'dust'. The emergence of lucrative markets for 'soil' and 'breeze' produc...

In this paper, a numerical calculation model of the mining face was established to analyze rational size coal pillars in goaf on both sides by using FLAC3D based geological conditions pilot area. Furthermore, feasibility co-ordinated reinforcement with steel pipe column explored, which can be applied recycling residual resources like protecting and great value increase recovery rate gobs as well.

One of the most important methods to produce sponge iron is coal based reduction of iron ore. Direct reduction methods based on coal are being improved due to the abundance of coal sources and its lower cost in comparison with natural gas. Volatile materials in coal play an important role in the reduction of iron oxides. In this study, noncoking coal with high volatile materials from Iran and c...