By Ernest K. Yanful
The target of the ebook is to debate environmental coverage and current northern and southern applied sciences and medical tools that handle particular environmental difficulties affecting humanity normally, yet extra particularly, humans and ecosystems in constructing international locations. The ebook comprises chosen, refereed papers submitted to or offered on the First foreign convention on Environmental examine, know-how and coverage held in Accra, Ghana, July 17-19, 2007. the first target of the convention used to be to supply a discussion board for coverage makers, scientists, practitioners, and civil society advocates to debate grass-root environmental matters, determine efforts by way of executive equipment and determine what groups and company entities can do as a social accountability to mainstream environmental safeguard for sustainable improvement. it really is stated that environmental study, know-how functions and coverage implementation were established to enhance environmental sustainability and defense in numerous built economies. The ebook argues that comparable profits might be accomplished in constructing nations and nations in transition
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Additional info for Appropriate Technologies for Environmental Protection in the Developing World: Selected Papers from ERTEP 2007, July 17-19 2007, Ghana, Africa
The combustion is conducted at an average temperature of 800 °C. During the process, the ash is cooled down to 150 °C and the process of energy exchange leads to the production of hot steam. The combustion of 1 t of straw produces about 5 t of steam. This is equivalent to about 50% of the energy produced by the similar amount of coal. The liquid resulting from the hydrolysis of straw is rich in potassium, which can be used as an agricultural fertilizer. However, the presence of sodium in the liquid can be harmful to the soil.
A conducted survey indicated that industries in Egypt are open to the idea of getting their needed supply of steam from a separate rice straw reactor, given that the cost of steam will not exceed its cost based on conventional sources of energy. 3. An environmental impact assessment study revealed that the project has positive impacts on the local level by eliminating many environmental and health problems associated with the current method employed for the disposal of rice straw. 4. On the global environmental level, the process results in emission of carbon dioxide which can be considered as a negative effect in view of the issue of green house emission.
The results show that rice straw is rich in silica. If the combustion of the straw is conducted under controlled conditions, this silica can be in the amorphous state, and in this case, it can have a positive effect in enhancing the mechanical properties of concrete. The core of the developed industrial process is a special reactor called “Torbed” which uses patented technology to a produce a uniform quality of ash. A preliminary combustion test for rice straw was conducted and a phenomenon described as “centering” was observed during this test.